WIKA CTR5000 Operating instructions

WIKA CTR5000 Operating instructions
Manual
Precision thermometer CTR5000
Accuracy 0.005 K
Version 1.1, 03/14
CTR5000 Operating Instructions
Contents
CONVENTIONS USED IN THIS MANUAL .................................................................................................... VIII
Structure of manual ............................................................................................................................ viii
Terminology ......................................................................................................................................... viii
Warnings and Notices ........................................................................................................................ viii
IMPORTANT SAFETY INFORMATION .............................................................................................................IX
IMPORTANT INSTALLATION INFORMATION .................................................................................................XI
IMPORTANT PROBE SAFETY INFORMATION ................................................................................................XII
IMPORTANT DISPOSAL INFORMATION ......................................................................................................XIII
European Union................................................................................................................................... xiii
Outside the European Union ............................................................................................................. xiii
Batteries ............................................................................................................................................... xiii
1.
INTRODUCTION ..................................................................................................................................... 15
1.1
Overview ................................................................................................................................. 15
1.2
Definitions and terminology .................................................................................................. 17
1.3
Differences between CTR5000 and F250.............................................................................. 17
1.4
Differences between CTR5000 0.005 K and CTR5000 0.01 K models ................................. 18
1.5
Principles of measurement.................................................................................................... 18
1.6
Temperature measurement .................................................................................................. 18
1.7
Measurement units ................................................................................................................. 19
1.8
Security .................................................................................................................................... 19
2.
SETTING UP THE CTR5000 ...................................................................................................................... 20
2.1
Safety information .................................................................................................................. 20
2.2
Unpacking the instrument ..................................................................................................... 20
2.3
Getting started ........................................................................................................................ 21
3.
ABOUT THE CTR5000 PRECISION BRIDGE ............................................................................................ 24
3.1
The front panel ........................................................................................................................ 24
3.2
About the LCD display screen .............................................................................................. 25
3.3
LED indicator ........................................................................................................................... 25
3.4
USB memory stick connector ................................................................................................ 25
3.5
Keypad .................................................................................................................................... 26
3.6
Input connections .................................................................................................................. 28
3.6.1 Passive and Smart Probes................................................................................................. 28
3.6.2 Probe connections ............................................................................................................ 28
3.6.3 2 Wire PRT ............................................................................................................................ 29
3.6.4 4 Wire PRT ............................................................................................................................ 29
3.6.5 4 Wire PRT with Smart Probe .............................................................................................. 29
3.6.6 Internal 100Ω check resistor ............................................................................................. 29
3.7
Rear panel ............................................................................................................................... 31
ASL operating instructions, model CTR5000
i
CTR5000 Operating Instructions
3.7.1
3.7.2
3.7.3
3.7.4
3.7.5
3.7.6
4.
ii
Name plate and serial number ....................................................................................... 31
Electrical rating plate ........................................................................................................ 31
Mains input ......................................................................................................................... 31
Expansion port ................................................................................................................... 31
USB Communication interface connector ...................................................................... 32
RS232/LAN/IEEE 488 Communication interface connector .......................................... 32
OPERATING THE CTR5000 ..................................................................................................................... 34
4.1
Instrument operating modes................................................................................................. 34
4.2
Measurement mode .............................................................................................................. 34
4.3
Setting the instrument’s operating conditions ..................................................................... 36
4.3.1 Hold key.............................................................................................................................. 37
4.3.2 Zero key .............................................................................................................................. 37
4.3.3 Resolution ........................................................................................................................... 38
4.3.4 Display key ......................................................................................................................... 38
4.3.4.1 Normal display......................................................................................................... 38
4.3.4.2 Full display ................................................................................................................ 38
4.3.4.3 Statistical display ..................................................................................................... 39
4.3.4.4 Graphical display .................................................................................................... 40
4.3.5 Channel soft-key ............................................................................................................... 40
4.3.6 Editor ................................................................................................................................... 41
4.4
Menu mode ............................................................................................................................ 42
4.4.1 Menu soft-key .................................................................................................................... 42
Selecting channels .............................................................................................................................. 45
4.4.2 Channel selection – method 1 ......................................................................................... 45
4.4.3 Channel selection – method 2 ......................................................................................... 46
4.4.4 Difference channel selection ........................................................................................... 47
4.4.5 Channel selection with CTS5000-8 and CTS5000-16 switchboxes ............................... 49
4.4.5.1 Method A .................................................................................................................. 49
4.4.5.2 Method B .................................................................................................................. 50
4.4.5.3 Method C.................................................................................................................. 52
4.5
Logging menu......................................................................................................................... 54
4.5.1 Internal logging menu ...................................................................................................... 54
4.5.2 Internal logging screen ..................................................................................................... 55
4.5.2.1 Logging interval ....................................................................................................... 56
4.5.2.2 View int log ............................................................................................................... 57
4.5.2.3 Xmit Int log ............................................................................................................... 58
4.5.3 External logging ................................................................................................................. 58
4.5.4 External logging screen .................................................................................................... 59
4.5.5 Logging limitations ............................................................................................................ 59
4.5.6 Scanning ............................................................................................................................. 60
4.5.7 Channel and probes ......................................................................................................... 62
4.5.8 Probe review and edit ....................................................................................................... 63
4.5.8.1 Probe menu .............................................................................................................. 63
4.5.8.2 Probe selection (individual) ................................................................................... 64
4.5.8.3 Probe groups menu (from group).......................................................................... 64
4.5.9 Probe review and editing ................................................................................................. 66
4.5.9.1 Conversion ............................................................................................................... 67
4.5.9.2 Review coeffs ........................................................................................................... 69
4.5.9.3 Edit coeffs ................................................................................................................. 69
ASL operating instructions, model CTR5000
CTR5000 Operating Instructions
4.5.9.4 Probe id .................................................................................................................... 70
4.5.9.5 Assign to chan (Unasgn from) ............................................................................... 71
4.5.9.6 Set units ..................................................................................................................... 72
4.5.9.7 Set Probe Tmax ........................................................................................................ 72
4.5.9.8 Set Probe Tmin ......................................................................................................... 73
4.5.9.9 Copy probe .............................................................................................................. 74
4.5.10 Set group conversion....................................................................................................... 74
4.6
Reference resistors ................................................................................................................. 75
4.6.1 Reference resistor menu ................................................................................................... 75
4.6.1.1 Auto reference resistor ........................................................................................... 75
4.7
Calibration .............................................................................................................................. 76
4.7.1 Calibration menu ............................................................................................................... 76
4.7.1.1 Calibration reference resistor ................................................................................ 77
4.7.1.2 Calibration method ................................................................................................. 78
4.7.1.3 Automatic instrument calibration .......................................................................... 80
4.7.2 Smart probe menu ............................................................................................................ 81
4.7.2.1 Reset defaults menu ................................................................................................ 83
4.7.3 Utilities menu ...................................................................................................................... 83
4.7.4 Options menu .................................................................................................................... 86
4.7.4.1 Security ..................................................................................................................... 87
4.7.4.2 Buzzer enab… .......................................................................................................... 89
4.7.4.3 Key buz enab… ....................................................................................................... 89
4.7.4.4 Standby enab… ....................................................................................................... 89
4.7.4.5 Data separator ......................................................................................................... 90
4.7.4.6 Date format .............................................................................................................. 90
4.7.4.7 CTR5000/F250 mode… ............................................................................................ 91
4.7.4.8 Rs/t display… ........................................................................................................... 91
4.7.5 Comms menu .................................................................................................................... 92
4.7.5.1 Talk on and Talk off ................................................................................................. 92
4.7.5.2 View status ............................................................................................................... 92
4.7.5.3 RS232 and IEEE options ............................................................................................ 93
4.7.5.4 Time and date .......................................................................................................... 95
4.7.5.5 Contrast .................................................................................................................... 96
4.7.5.6 Diagnostics ............................................................................................................... 97
5.
DATA PAIRS ........................................................................................................................................... 98
5.1
Introduction ............................................................................................................................. 98
5.2
Procedure................................................................................................................................ 98
5.3
Data Pair menu ....................................................................................................................... 99
5.3.1 Edit… ................................................................................................................................. 100
5.3.2 Calculate… ...................................................................................................................... 102
5.3.3 CvD .................................................................................................................................... 103
5.3.4 CvD (A=R, B= T) ................................................................................................................ 103
5.3.5 Ag(0.01,961.78C) to 12 Ar(-192.35,0C) ....................................................................... 103
6.
INSTRUMENT MEASUREMENT RANGE ................................................................................................. 104
6.1
Instrument measurement working range .......................................................................... 104
6.2
Measurement ranges........................................................................................................... 104
7.
CALIBRATING THE CTR5000 ................................................................................................................ 106
ASL operating instructions, model CTR5000
iii
CTR5000 Operating Instructions
7.1
7.2
7.3
7.4
iv
CTR5000 reference calibration ........................................................................................... 106
Equipment ............................................................................................................................. 106
Calibration procedure ......................................................................................................... 106
Full instrument calibration procedure ................................................................................ 106
8.
OBTAINING THE BEST FROM THE CTR5000 BRIDGE ........................................................................... 108
8.1
Procedure .............................................................................................................................. 108
9.
COMMUNICATIONS - INTERFACE AND PC COMMANDS ................................................................ 110
9.1
Introduction ........................................................................................................................... 110
9.2
Interfaces .............................................................................................................................. 110
9.2.1 USB device driver ............................................................................................................. 110
9.2.2 IEEE-488.2 interface (optional) ....................................................................................... 111
9.2.3 RS232 interface (optional) .............................................................................................. 115
9.2.4 LAN interface (optional) ................................................................................................. 116
9.3
Instrument PC commands ................................................................................................... 117
9.3.1 Remote mode (local lockout)........................................................................................ 117
9.3.2 Programming command syntax .................................................................................... 117
9.3.3 Case sensitivity ................................................................................................................ 118
9.3.4 Long form short form commands................................................................................... 118
9.3.5 Command terminators <cr> or <cr><lf> ....................................................................... 118
9.3.6 Error responses ................................................................................................................. 119
9.3.7 CTR5000 0.005 K and CTR5000 0.01 K commands ........................................................ 119
9.3.8 Starting with PC commands ........................................................................................... 119
9.4
Interface commands ........................................................................................................... 120
9.4.1 *IDN? ................................................................................................................................. 120
9.4.2 SYSTem:REMOte ............................................................................................................... 120
9.4.3 SYSTem:LOCAl .................................................................................................................. 120
9.4.4 SYSTem:ACKNowledge <state> ..................................................................................... 121
9.4.5 SYSTem:CALIbrated? ....................................................................................................... 121
9.4.6 SYSTem:DISPlay:RESOlution <argument> ...................................................................... 121
9.4.7 SYSTem:DISPlay:RESOlution? ........................................................................................... 122
9.4.8 SYSTem:DATE <date> ....................................................................................................... 122
9.4.9 SYSTem:DATE? .................................................................................................................. 122
9.4.10 SYSTem:PASSword <password>,<enable> .................................................................. 123
9.4.11 SYSTem:PASSword? ........................................................................................................ 123
9.4.12 SYSTem:TIME <time> ....................................................................................................... 123
9.4.13 SYSTem:TIME? .................................................................................................................. 124
9.4.14 SYSTEM:ECHO: <argument> .......................................................................................... 124
9.4.15 SYSTem:DISPLay:TIME <state> ....................................................................................... 124
9.4.16 SYSTem:BEEPer <note>,<length> .................................................................................. 125
9.4.17 SYSTem:MESSage <message> ...................................................................................... 125
9.4.18 SYSTem:SNUMber? ......................................................................................................... 125
9.4.19 SYSTem:PCB? .................................................................................................................. 125
9.4.20 MEASure:CURRent? ........................................................................................................ 127
9.4.21 CONFigure:CHANnel <channel> .................................................................................. 128
9.4.22 CONFigure:CHANnel? ................................................................................................... 128
9.4.23 CONFigure:CHANnel:FITTed? <channel> .................................................................... 128
9.4.24 CONFigure:SERIal? ......................................................................................................... 129
9.4.25 CONFigure:IEEE? ............................................................................................................. 129
ASL operating instructions, model CTR5000
CTR5000 Operating Instructions
9.4.26
9.4.27
9.4.28
9.4.29
9.4.30
9.4.31
9.4.32
9.4.33
9.4.34
9.4.35
9.4.36
9.4.37
9.4.38
9.4.39
9.4.40
9.4.41
9.4.42
9.4.43
9.4.44
9.4.45
9.4.46
9.4.47
9.4.48
9.4.49
9.4.50
9.4.51
9.4.52
9.4.53
9.4.54
9.4.55
9.4.56
9.4.57
9.4.58
9.4.59
9.4.60
9.4.61
9.4.62
9.4.63
9.4.64
9.4.65
9.4.66
9.4.67
CONFigure:LAN? ............................................................................................................ 129
CONFigure:REFErence <argument> ............................................................................. 130
CONFigure:REFErence? ................................................................................................. 130
CONFigure:CHANnel:SMARt? ....................................................................................... 130
PROBe:ASSIgn <probe>,<channel> ............................................................................. 132
PROBe:ASSIgn? <probe> ............................................................................................... 132
PROBe:IDENtifier <probe>,<type> ................................................................................ 132
PROBe: IDENtifier? <probe> ........................................................................................... 133
PROBe:TMAX <probe>,<temperature> ........................................................................ 133
PROBe: TMAX? <probe> ................................................................................................ 133
PROBe: TMIN <probe>,<temperature> ........................................................................ 134
PROBe: TMIN? <probe>.................................................................................................. 134
PROBe:STANdard <probe>,<type> ............................................................................... 135
PROBe: STANdard? <probe> ......................................................................................... 135
PROBe:UNIT <probe>,<units> ........................................................................................ 135
PROBe: UNIT? <probe>................................................................................................... 136
PROBe:COEFficient <probe>,<identifier>,<value> ..................................................... 136
PROBe:COEFficient? <probe>,<identifier>................................................................... 137
UNIT:TEMPerature <units> .............................................................................................. 138
UNIT:TEMPerature? .......................................................................................................... 138
SENSe:FRTD:CAL:DATE <year>,<month>,<day> .......................................................... 139
SENSe:FRTD:CAL:DATE? .................................................................................................. 139
SENSe:FRTD:CAL:NEXT <year>,<month>,<day> .......................................................... 139
SENSe:FRTD:CAL:NEXT? .................................................................................................. 139
SENSe:FRTD:CAL:SOURce <source> .............................................................................. 140
SENSe:FRTD:CAL:SOURce?> ........................................................................................... 140
SENSe:FRTD:STANdard <standard> ............................................................................... 140
SENSe:FRTD:STANdard? .................................................................................................. 141
SENSe:FRTD:REFErence <reference> ............................................................................. 141
SENSe:FRTD:REFErence? ................................................................................................. 141
SENSe:FRTD:COEFficient <coefficient>,<value> .......................................................... 141
SENSe:FRTD:COEFficient? <coefficient> ....................................................................... 142
SENSe:FRTD:IDENtification <identification> .................................................................. 142
SENSe:FRTD:IDENtification? ............................................................................................ 142
SENSe:FRTD:RANGe <rmax>,<rmin> ............................................................................. 143
SENSe:FRTD:RANGe? ...................................................................................................... 143
SENSe:FRTD:LOCK <state>.............................................................................................. 143
SENSe:FRTD:LOCK? ......................................................................................................... 144
SENSe:FRTD:ENABle <parameter> ................................................................................. 144
SENSe: FRTD:ENABle?...................................................................................................... 144
SENSe:ZERO <parameter> ............................................................................................. 144
SENSe:ZERO? ................................................................................................................... 145
10.
ERROR CODES ............................................................................................................................... 146
11.
CLEANING AND MAINTENANCE .................................................................................................. 148
11.1
Cleaning ................................................................................................................................ 148
11.2
Maintenance ........................................................................................................................ 148
12.
SERVICE AND WARRANTY ............................................................................................................ 149
ASL operating instructions, model CTR5000
v
CTR5000 Operating Instructions
12.1
Technical Support ................................................................................................................ 149
13.
APPENDIX 1 – DEFINITIONS AND TERMINOLOGY........................................................................ 150
14.
APPENDIX 2 – FIRMWARE UPDATE ................................................................................................ 151
14.1
Firmware updates................................................................................................................. 151
14.2
Firmware update disclaimer ............................................................................................... 151
14.3
Firmware update procedure ............................................................................................... 151
15.
APPENDIX 3 – CALLENDAR VAN DUSEN ...................................................................................... 153
15.1
Callendar van Dusen equation (CvD ................................................................................. 153
16.
APPENDIX 4 - ITS-90 ...................................................................................................................... 154
16.1
International Temperature Scale (ITS-90) .......................................................................... 154
17.
APPENDIX 5 - DIN STANDARD ...................................................................................................... 156
17.1
DIN 90 1980 (EN 60751) ........................................................................................................ 156
17.2
DIN 43760 1980 (IEC 751) ..................................................................................................... 156
18.
APPENDIX 6– AC BRIDGE OPERATION......................................................................................... 157
18.1
AC Bridge basics .................................................................................................................. 157
19.
APPENDIX 7– REPORT EXAMPLES ................................................................................................. 159
19.1
Channel report ..................................................................................................................... 159
19.2
Assigned probes report ....................................................................................................... 160
19.3
All probes report ................................................................................................................... 161
19.4
Instrument report .................................................................................................................. 162
19.5
Smart probe report ............................................................................................................... 163
APPENDIX 8 – CTR5000 0.01 K PC COMMANDS ...................................................................................... 165
19.6
CTR5000 0.01 K PC commands ........................................................................................... 165
19.6.1 CTR5000 0.01 K Remote mode (local lockout) ........................................................... 165
19.6.2 CTR5000 0.01 K Commands and Syntax ...................................................................... 165
19.6.3 A command.................................................................................................................... 167
19.6.4 C command (CTR5000 0.01 K only) ............................................................................. 168
19.6.5 E command .................................................................................................................... 168
19.6.6 ! command ..................................................................................................................... 168
19.6.7 *I command.................................................................................................................... 168
19.6.8 F command .................................................................................................................... 168
19.6.9 H command .................................................................................................................... 169
19.6.10 Hn command................................................................................................................ 169
19.6.11 I command ................................................................................................................... 169
19.6.12 L command................................................................................................................... 169
19.6.13 M command ................................................................................................................. 170
19.6.14 N command.................................................................................................................. 171
19.6.15 P command .................................................................................................................. 171
19.6.16 Q or ? command .......................................................................................................... 171
19.6.17 R command .................................................................................................................. 172
19.6.18 S command .................................................................................................................. 172
19.6.19 T or D command ........................................................................................................... 174
19.6.20 U command .................................................................................................................. 174
vi
ASL operating instructions, model CTR5000
CTR5000 Operating Instructions
19.6.21
19.6.22
19.6.23
20.
Z command .................................................................................................................. 174
Zn command ................................................................................................................ 174
CTR5000 0.01 K Error codes ......................................................................................... 175
SPECIFICATIONS ............................................................................................................................ 177
20.1
Resistance thermometer measurement ............................................................................ 177
20.2
Display ................................................................................................................................... 178
20.3
Power supply......................................................................................................................... 178
20.4
Environmental ....................................................................................................................... 178
20.5
Dimensions and weight ....................................................................................................... 178
20.6
Approvals .............................................................................................................................. 178
INDEX .......................................................................................................................................................... 179
ASL operating instructions, model CTR5000
vii
CTR5000 Operating Instructions
Conventions used in this manual
Structure of manual
The manual is divided into sections. Each section deals with a specific topic or related
topics. Sections are displayed in a regular, bold typeface, for example - 1.0 Introduction.
Sections are sub-divided into sub-headings, for example - 1.1 Features. These may also
be subdivided.
Terminology
The terms CTR5000 Bridge, AC Bridge, CTR5000, bridge and instrument are used
interchangeably in this manual.
Menu selection is shown in shorthand form, for example –
Menu  2 Probe…  
Means Press the Menu soft-key, then move to, and select menu item 2 Probe… and then
the enter ( ) soft-key.
Warnings and Notices
These appear in the body of the text, clearly displayed with a box surrounding the text.
The first word within the box displays the type - Warning or Note.
A Warning (double box) is designed to draw attention to an aspect that may cause
danger to the user or damage to the instrument. A Note (single box) is used to bring
special attention to something important requiring action or avoidance.
Copyright © 2013 ASL. All rights reserved.
Information in this document is subject to change without notice.
Reproduction or modification of the whole or any part of this document (in any form) without ASL’s written permission is
forbidden (except for internal use by an authorised dealer or agent). Customers may make copies for internal use only.
Whilst efforts have been made to ensure the accuracy of information presented here, ASL can assume no responsibility for the
accuracy of any information presented or the consequences of acting on this information. ASL also disclaims any
representation that the contents are current. However, ASL would be grateful for any comments on the layout, accuracy or
contents of this manual.
ASL shall not be liable for problems or damages arising from the use (or misuse) of items, servicing, equipment, procedures or
options supplied by other companies.
ASL, 4 Gatton Park Business Centre, Wells Place, Merstham, Redhill, RH1 3LG, U.K.
Phone: +44 (0) 1737 644 008. Fax: +44 (0) 1737 644 403. email info@aslltd.co.uk
viii
ASL operating instructions, model CTR5000
CTR5000 Operating Instructions
Important safety information
Read and understand the user instruction manual before attempting to use the instrument.
The CTR5000 is an AC bridge designed for measuring passive resistances. It must not be used
for any other purpose.
Warning
The protection provided by the instrument may be impaired if the
equipment is not used in the manner specified.
Only replace items or components with an approved or
equivalent spare part. All spare and consumable parts are
available from ASL.
Warning
The instrument is NOT designed to be used in a potentially
explosive atmosphere or medical environment.
Warning
Do NOT open the case. There are no user serviceable parts inside.
Warning
Inspect cables and probes regularly, ensuring that their insulation
is not damaged.
Warning
The instrument and the internal lithium clock battery must be
disposed of in accordance with local regulations.
ASL operating instructions, model CTR5000
ix
CTR5000 Operating Instructions
Warning
The instrument is sensitive to radiated noise and care must be
taken to ensure a clean mains supply and controlled EM
environment..
General warning symbol. This indicates that a
hazardous condition or general danger may exist.
You must read the relevant sections in the User
Manual before using the instrument.
Refer to manual symbol. When you see this symbol
on the instrument it means that there is more
information relating to this in the User Manual.
x
ASL operating instructions, model CTR5000
CTR5000 Operating Instructions
Important installation information
Please ensure that the instrument is installed correctly.
 Do NOT use the instrument near water or in damp conditions
 Do NOT locate the instrument near a source of heat
 Do NOT insert objects into any ventilation openings
 Do NOT site the instrument in a draught or near an air-conditioning unit
 Do NOT site the instrument near any strong magnetic fields
 Do NOT place any weight on top of the instrument
 Locate the instrument on a suitable and secure surface
 Ensure air can freely circulate around the instrument
The instrument uses a universal input voltage power supply. Use a plug to connect to the
mains supply. If in doubt, consult a qualified electrician. The supply connections are shown
below (if a UK cord set is fitted).
Brown wire
to Live (Line)
-
L
Blue wire
to Neutral
-
N
Green and Yellow wire
to Earth (Ground)
-
E
Warning
The instrument is designed to be connected to the mains supply
via a plug and must be effectively earthed.
ASL operating instructions, model CTR5000
xi
CTR5000 Operating Instructions
Important probe safety information
Care must be taken with the probes used with the instrument. The following safety information
must be observed.

Do NOT attempt to lift the CTR5000 by any of the leads

Do ensure that long probe-leads and other leads are kept away from areas where
people could trip over them or become tangled in them

Do ensure the probe-leads and other leads are kept in good condition
Warning
Because of the nature of the instrument, probes can
be excessively HOT or COLD during use. Take suitable
precautionary measures when handling probes.
Take care that you (and other people working in the
same area) do not come into contact with the
metallic probe or the insulating sheath near the probe,
which will also be hot/cold.
Precautions apply both during use or when moving the
probe from one position to another.
Warning
Probes may be immersed in various chemicals during
use. Some of these chemicals may be dangerous or
harmful (even when the probe is cold).
Always assume that the probe has been used this way
and DO NOT touch the probe without suitable
protective clothing.
Warning
DO NOT allow the probe to touch any external
voltages such as MAINS power.
xii
ASL operating instructions, model CTR5000
CTR5000 Operating Instructions
Important disposal information
If you are responsible for disposal, then please note that this product may contain
materials that are regulated in their disposal due to environmental considerations. The
presence of these materials is consistent with global regulations applicable at the time
this product was placed on the market.
European Union
This symbol means that the product to be disposed of
should not be mixed with commercial or general
household waste. Used products must be treated
separately in accordance with legislation that requires the
proper treatment, recovery and recycling of the product.
If you wish to discard the product, then please contact
your dealer, supplier or representative who will advise the
correct procedure for disposal.
Disposing of the product correctly will help to save
valuable resources and prevent environmental damage.
Outside the European Union
The symbol only applies within the European Union. If you
need to discard the product, then please contact your
dealer, supplier or the local authorities and ask for the
correct method of disposal.
Batteries
The CTR5000 contains a replaceable lithium cell held in a
holder on the main PCB. This cell must be disposed of in
accordance with local regulations
ASL operating instructions, model CTR5000
xiii
CTR5000 Operating Instructions
This page is intentionally left blank
xiv
ASL operating instructions, model CTR5000
CTR5000 Operating Instructions
1. Introduction
1.1 Overview
The CTR5000 Precision Thermometer is designed for laboratory, commercial and industrial
temperature measurement and calibration applications. The performance and multi-channel
capabilities make it ideal for a wide range of applications.
The CTR5000 Bridge is based on AC technology and operates with all 4-wire Platinum
Resistance Thermometers (PRTs)1. Features include –

Two, four or six channel operation2

Immunity to most sources of errors present in DC Bridges

0.5 second update rate (to full specification)

2 m accuracy, 0.1m resolution (5mK accuracy and 1mK resolution)

Internal (25 and100 ) reference resistors

Wide operational range including all 4-wire thermometers with R0 values of Pt100 (100
), Pt25.5 (25.5 ) and Pt0.25 (0.25 )

Internal and external logging

Graphical LCD for excellent viewing of results and instrument settings

Full (expanded) command set for PC control

Probe coefficient generator from data pair measurements

Statistical, graphical and large display modes

User selectable units –- ratio, resistance or temperature display (, C, F or K)

Smart probe compatibility

Expandable multi-channel input multiplexing (up to 64 additional channels)

Channel scanning on switchboxes
1
Two wire PRTs may be used with reduced accuracy.
2
Two channels supplied on the CTR5000 as standard, expandable to four or six.
ASL operating instructions, model CTR5000
15
CTR5000 Operating Instructions

USB communication interface as standard for automated monitoring and calibration
applications

RS232 or IEEE 488 or LAN interface options

Automatic calibration against traceable external resistors

Power-on diagnostic check
The CTR5000 is ASL’s second AC bridge3 with Smart probe capability. It is also the fastest
commercially available bridge for its specifications. It has several additional features that are
not available on the CTR5000 0.01 K –

2 m accuracy, 0.1m resolution (5mK accuracy and 1mK resolution)

Internal (25 and100 ) reference resistors

Internal and external logging

Full command set for PC control

Probe coefficient generator from data pair measurements
Overall system accuracy is better than 2m, (at 20C 5C - see specification section),
equivalent to a temperature measurement accuracy of 5mK.
Two measurement channels (A and B) are provided on the front of the instrument. The
CTR5000 may be expanded up to six channels with the addition of two more channels (C and
D), or four more channels (C, D, E and F) on the rear of the instrument; differential mode
operation is provided for these channels. A separate channel connection is supplied for the
expansion switchboxes.
Up to 64 channels may be added with the addition of external CTS5000 switchboxes. Two
switchbox models are available – the CTS5000–8 and the CTS5000–16 (with 8 or 16 channels
respectively). The switchboxes use an expansion connector on the rear of the instrument.
Channels A, B (C, D, E and F) operate independently of the switchboxes.
Unlike previous instruments, units may be set on a channel basis, so, for example, channel A
may be set to C and channel B to display ohms.
3
The F252 was the first
16
ASL operating instructions, model CTR5000
CTR5000 Operating Instructions
1.2 Definitions and terminology
See appendix 1
1.3 Differences between CTR5000 and F250
The CTR5000 has many more features and options than the F250. The fundamental differences
are –
CTR5000 and F250 – fundamental differences
CTR5000
F250
 2 m  ( 5 m K ) accuracy
 4 m  ( 1 0 m K ) accuracy
0.5 s update rate
3 s update rate
2 channels, expandable to 6 channels
2 channels only
Instantaneous temperature conversion
Temperature conversion table takes many seconds
Switchbox uses a separate input
Each switchbox uses one F250 channel
Expandable to 70 channels
32 channels maximum
Units definable per probe
Global units only
Passive and Smart probes
Passive probes only
Full Graphical display
Limited numerical display
Additional 25 reference resistor
Coefficient generation from data pairs
Internal logging
External logging
Full SCIPI command set
Channel scanning
ASL operating instructions, model CTR5000
17
CTR5000 Operating Instructions
1.4 Differences between CTR5000 0.005 K and CTR5000 0.01 K models
The CTR5000 0.005 K has additional features. The fundamental differences are –
Fundamental differences
CTR5000 0.005 K
 2 m  ( 5 m K ) accuracy
CTR5000 0.01 K
 4 m  ( 1 0 m K ) accuracy
Additional 25 reference resistor
Coefficient generation from data pairs
Internal logging
External logging
Full SCIPI command set
Channel scanning
1.5 Principles of measurement
See appendix 6 for a detailed description.
1.6 Temperature measurement
When using PRTs, the relationship between resistance and temperature varies slightly from
one PRT to another. Therefore, no matter how accurately the CTR5000 measures the PRT
resistance, if the relationship between resistance and temperature for a particular PRT is not
known, accurate temperature measurement is not possible.
The CTR5000 uses PRT calibration data to overcome this problem and calculates the
temperature from conversion functions using calibration data stored in internal non-volatile
memory. This method enables the CTR5000 to convert ratio to temperature, uniquely for each
sensor used. It is very important, therefore, that a sensor is used with the probe’s coefficients
correctly entered into the instrument. The CTR5000 uses the standard DIN90 conversion
method when specific probe calibration data has not been entered. Temperature conversion
occurs in real-time.
18
ASL operating instructions, model CTR5000
CTR5000 Operating Instructions
Note
Always check that the coefficients are correctly set for
the probe being used. Failure to do so, will almost
certainly lead to incorrect measurements.
System accuracy is a combination of the Bridge’s accuracy in measuring the probe’s
resistance ratio and the calibration uncertainty placed on the reference resistor and PRTs by
the calibrating laboratory.
When calibrated PRTs are used with the CTR5000, either with or without switchboxes, the
calibration data can be entered via the keypad on the front panel, and is stored in internal
memory. Stored PRT calibration data may also be reviewed.
1.7 Measurement units
Units can be set on a per probe basis (probes are assigned to channels). When a new
channel is selected, the CTR5000 will check to see if a probe is assigned to that channel. If it
is, the programmed probe’s units will be used (initially) - this does not prevent the units from
being changed later. This feature is useful when calibrating probes (if instrument units are
selected for the probe, units will remain unchanged when it is used).
1.8 Security
Security is important for data integrity and password protection helps to ensure that only
authorised personnel can change calibration or system information. Three levels of protection
are provided.
Note
All examples in the following sections (apart from the
section on security) assume that no security mode is
selected.
ASL operating instructions, model CTR5000
19
CTR5000 Operating Instructions
2. Setting up the CTR5000
2.1 Safety information
Please read the safety information section before operating the CTR5000.
2.2 Unpacking the instrument
When unpacking the CTR5000 Bridge, check that the following items are present before using
the instrument4 –

CTR5000 precision thermometry bridge

Operator’s handbook on CD

Laminated A5 Reference guide

Test certificate

Mains lead

USB lead

USB memory stick

Spare fuses
Please contact the ASL Technical Services Group5 immediately if any of these items are
missing or damaged.
Please retain the packaging. In case of return, servicing or calibration, use the original
packaging (failure to do so may invalidate the warranty and/or incur additional costs outside
the warranty period). Please contact your agent, dealer or supplier when the original
packaging is unavailable.
To enable accurate resistance to temperature conversion to be carried out by the instrument,
PRT characterisation data may be required.
4
Thermometer probes and other accessories (if ordered) will be supplied separately.
5
Details are located at the end of the manual (in the Technical support section.
20
ASL operating instructions, model CTR5000
CTR5000 Operating Instructions
By default, the CTR5000 operates with DIN90 temperature conversion. The instrument may also
be set to use DIN68 or CvD or ITS90 conversion methods6. Alternatively, the coefficients may
be generated automatically from resistance and temperature data-pairs.
The conversion coefficients are fixed for DIN90 (also for CvD and DIN68), so no further data
entry is required7. However, if ITS90 is used as a conversion method, coefficient data will have
to be entered using the simple coefficient editor.
A probe’s conversion algorithm and its coefficients are stored in the instrument’s internal nonvolatile memory. Up to 72 probes may be individually defined8.
Set-up details for the probes are covered later in the manual.
2.3 Getting started

Read the manual thoroughly before using the instrument

Unpack the instrument and allow to thermally stabilise before switching on
(particularly if the instrument has been stored in a cold environment)

Connect a 100 ohm resistor (any type will do) to channel A (as described in
section 3.5)9

Connect the mains lead and switch on. After a short diagnostic check
sequence, the CTR5000 will start measuring the resistance10

Change one setting at a time to familiarise yourself with each of the options.
Start with the Unit key (below the Unit legend) at the bottom right of the LCD,
changing to C, F, K and back to ohms –
Chan
6
Hold
Unit
Coefficients are fixed for DIN methods. Default values are used for CvD, but these can be changed. ITS90 coefficient data
must be entered.
7
The R0 value for these conversion methods will be automatically adjusted when the 25 ohms reference resistor is used.
8
The probe’s information also defines its units, which channel uses the probe and an optional probe identifier string.
9
If a probe or resistor is not available, use the internal check resistor by selecting channel 99. To do this, press the 9 key on
the numerical keypad twice (99) and then press the enter key on the keypad. IntR will be displayed at the top left of the
LCD. The internal check resistor will be deselected when the channel is changed to any other (or the CTR5000 turned off).
10
As supplied, the CTR5000 will be set for this measurement.
ASL operating instructions, model CTR5000
21
CTR5000 Operating Instructions

Press the Chan key under the bottom left of the LCD. The bottom row of the LCD
will change to11 –
Ch A

Ch B
More
Diff
Press the Ch B key and the display will change to show channel B (indicated at
the top left of the LCD). The bottom line of the LCD will revert to display –
Chan
Hold
Unit
The open probe symbol will be displayed (no probe on channel B) –

Press the 1 key on the numeric keypad. The top left of the LCD will display a
flashing Cn01, indicating channel 1 (A). Press the  key (bottom right of the
keypad). The CTR5000 will return to channel A

Press the blue display key
(underneath the 7 on the numerical keypad).
The bottom line of the LCD will change to show –
Full

Stats
Graph
n.nnn
Press the n.nnn key to change the display resolution between 0 and 3 decimal
places (0 and 4 for resistance). Reset to 3 decimal places

These steps cover most of the F250 functionality (apart from coefficient editing
and security modes)

Press the Stats key to display statistics mode. The bottom line of the LCD will
change to –
Chan
Clr
Hold
Unit
(Clr resets the statistics values)

Press the blue display key again. The LCD will change to display –
Num
11
22
Graph
n.nnn
The More menu item will only be present if more than 2 channels are fitted.
ASL operating instructions, model CTR5000
CTR5000 Operating Instructions

Press the Graph key to display graphical mode

Press the blue display key again and then press Num key to return to numerical
display mode

Finally, press the blue display key and then press Full key to display the result in
large mode. Press the blue key and Norm to return to normal display mode. All
other functions are accessed via the menu system (see section 4)
ASL operating instructions, model CTR5000
23
CTR5000 Operating Instructions
3. About the CTR5000 Precision Bridge
This section introduces the features and functions of the CTR5000 Bridge. Each of the CTR5000
Bridge’s features is explained in turn. Once the CTR5000 has been set to your particular
requirements, commonly used functions use the minimum number of key-strokes.
3.1 The front panel
The front panel is shown below with the various keys and connectors –
Inputs
LCD
Status line
ChA ITS90
Pb09
Soft keys (6)
12:02:03
A
C
132•041
Esc
Zero
Hold
1
2
3
4
5
6
7
8
9
0

Menu

Chan
Numeric keypad
Unit
B
Staus icons
Status LED
USB memory stick
Front panel
The graphical display is positioned approximately in the centre off the instrument with the two
input connectors to the left. The LED to the right is used to indicate status (and also that the
bridge is in standby mode - when the graphical display is in low power mode). The USB
memory-stick connector is positioned below the LED.
The various controls, connectors, displays and keys are described in detail in each of the
following sections. The four keys under the display and the two keys to the right are ‘soft-keys’
- their function varies with the instrument operating mode (whenever these keys can be used,
their current function will be displayed next to the key). Channel, probe and conversion
information is shown on the top line of the LCD.
The line underneath the result is used to display any relevant icons (LAN icon shown).
24
ASL operating instructions, model CTR5000
CTR5000 Operating Instructions
3.2 About the LCD display screen
The graphic LCD (Liquid Crystal Display) screen presents measurement results, instrument
status, the current soft-key legends and menus, to set and control the CTR5000.
The LCD screen is designed for anti-reflective-viewing under normal ambient lighting. The LCD
contrast may be set via a menu option (its brightness is fixed).
3.3 LED indicator
The LED, to the right of the LCD is used to show normal operation (green) and is lit whenever
the bridge is in standby mode. In this mode, the LCD display is turned off, saving power and
prolonging the display’s life; the remainder of the electronics is still powered normally during
standby and the instrument will continue collecting data.
The LED will flash orange when a fault condition is present (overload, , etc). It will flash green
when an open-probe is seen.
The LED will turn red if a serious problem is detected.
3.4 USB memory stick connector
The USB memory stick connector is positioned below the LED. It is used to connect a memorystick (to store reports).
USB file conventions are DOS based. File names are automatically allocated in numerical
sequence with the correct extension and date and time stamped.
USB operation has been checked with the Kingston range of USB memory sticks. Most other
manufacturer’s version should also work.
There are several USB related messages that may appear during use. For example, the
number of files found in the CTR5000 directory is shown briefly once the memory stick is
plugged in.
Note
A maximum of 999 files can be stored in the CTR5000
before naming becomes an issue.
It can take several seconds to read the CTR5000
directory. It is recommended that files be transferred to
a differently named directory to prevent start-up delays.
It is sensible to transfer important files to an alternative
back-up device as soon as practicable.
ASL operating instructions, model CTR5000
25
CTR5000 Operating Instructions
Note
Insert the memory stick before selecting transfer. Allow
the directory to be read.
Do not remove the memory stick until any transfer
operation is complete.
3.5 Keypad
The keys are grouped by type and consist of six soft-keys and a twelve-key numerical
keypad. The soft-keys are used to access data and/or functions within the instrument.
The CTR5000 keypad is shown in detail below. The keys are used to select the various
functions and menu options and to control the instrument. Generally, all commonly used
functions are available at the top level and no more than one or two menu levels are
required for other commonly used settings. A few (infrequently used options) require three or
four menu levels. Operation is very simple and straightforward, once familiar with the
instrument.
It may help to have the instrument to hand when reading through these sections. Refer to
section 5 for a detailed description of how to use the keys to operate the instrument.
ChA ITS90
Pb09
12:02:03
C
132•041
Chan
Zero
Hold
Esc
1
2
3
4
5
6
7
8
9
Menu
Unit
Front panel detail
The soft-keys are used to select common functions – Chan , Zero, Hold and Unit. The blue
display key is used to select other display modes. All other settings and functions are
accessed via the menu key. The numeric keypad is used to enter numerical values or to
directly select a measurement channel12 or menu.
12
26
By typing a one or two digit channel number followed by the enter ( ) key on the numeric keypad.
ASL operating instructions, model CTR5000
CTR5000 Operating Instructions
Instrument functions keys
Key symbol
Chan
Description
Function
Select Input Channel
Displays the channel select options
Zero (see note)
Zero display measurement
Toggles the display zero (null) function
Hold (see note)
Hold display measurement
Toggles the display hold (measurement continues)
Unit
Select display units
Rotates through the display-units (, C, F or K)
Esc
Escape
Returns without action. The LCD is redrawn
Display CTR5000 menu
Used to select all other options and functions
Menu
Note
Zero will not be available in resistance mode.
Zero and Hold will be disabled when the units are
changed. Hold takes precedence over Zero.
Numeric keypad
Key symbol
Description
Function
0 to 9
Numerical data entry
Enters a numerical digit, selects a numeric menu or
selects a channel
Enter
Enter data
Used to select a measurement channel or after
numerical data entry
Disp
Display mode
Changes the LCD between the 4 display modes –
normal, large, statistical and graphical
Summary of front panel key functions
ASL operating instructions, model CTR5000
27
CTR5000 Operating Instructions
3.6 Input connections
Two 5-pin DIN input sockets (channel A and channel B) are located on the front panel and up
to four more sockets may be present on the back of the CTR5000 (channels C, D, E and F).
Up to four expansion switchboxes may be attached to the instrument via the rear expansion
port connector. Each switchbox has an additional 8 (model CTS5000-8) or 16 channels
(model CTS5000-16), enabling between 2 to 70 channels to be used by the CTR5000.
The selected input channel is interrogated before each measurement cycle, and when
enabled, smart probes are identified by ‘Smart’ appearing at the top of the display. Open
circuit thermometer input channels will display the open probe connector symbol shown
below –
Open probe symbol
3.6.1 Passive and Smart Probes
All inputs accept Passive probes and/or Smart Probes.
Passive probes do not contain any calibration information and the CTR5000 must be set-up
with conversion data for each passive probe used. Up to 72 sets of passive probe information
can be stored and retained by the CTR5000. Each available CTR5000 measurement-channel
can have one of the stored probes attached to it - the instrument will automatically use the
stored conversion data for this channel.
Alternatively, Smart Probes can be used. These probes contain the calibration data within the
probe connector and this data will be used to over-ride any internal CTR5000 settings when a
smart-probe is seen on an input channel.
Each input channel can accept either a Smart probe or a Passive probe. Any combination of
both types of probe can be use together.
3.6.2 Probe connections
The inputs can be configured for 2-wire or 4-wire probes. Input connections are shown below
–
28
ASL operating instructions, model CTR5000
CTR5000 Operating Instructions
Passive PRT input (viewed from the front of the instrument)
Shield
SMP
V+
V-
3
4
2
I+ 1
5
Pt100
I-
PRT CONNECTION - 4 WIRE
(5-pin DIN connector)
viewed from top panel
4-Wire SMART probe PRT input connection (viewed from the front of the instrument)
3.6.3 2 Wire PRT
Connect pin 1 to pin 2, pin 4 to pin 5, connect the 2-wire PRT between pin 2 and pin 4.
3.6.4 4 Wire PRT
Connect PRT I+ lead to pin 1, V+ lead to pin 2, V- lead to pin 4 and I- lead to pin 5.
3.6.5 4 Wire PRT with Smart Probe
Refer to document ASL-SMP-10-101 Smart Probe Conversion Kit.
3.6.6 Internal 100Ω check resistor
ASL operating instructions, model CTR5000
29
CTR5000 Operating Instructions
The CTR5000 contains an internal check resistor. Select channel 99 to use this resistor (IntR will
displayed at the top left of the LCD). It is quite accurate, but not as temperature-stable13 as
the internal reference resistor. The resistor will be deselected when the channel is changed or
on power-on. It is not necessary to remove any external resistors when using the internal
resistor. The resistor is checked at power-on to ensure the CTR5000 is functioning correctly.
Channel 99 only functions with resistance units.
13
30
10ppm/C
ASL operating instructions, model CTR5000
CTR5000 Operating Instructions
3.7 Rear panel
The rear panel is shown below with the various items and connectors indicated –
Fused, filtered, switched mains inlet
RS232/LAN/IEEE option
Name/electrical rating plate
CTS5000 expansion
port
Optional inputs (2 or 4)
E
C
F
D
USB port
Rear panel
3.7.1 Name plate and serial number
The instrument’s serial number is shown here.
3.7.2 Electrical rating plate
The instrument rating information on the rear panel shows the instrument’s input supply
requirements, fuse value and maximum power consumption.
3.7.3 Mains input
The mains input connector is situated on the left of the rear panel. It uses a standard IEC
connector and lead (supplied). The input connector has a switch and is fused and filtered.
The fuse is located within the body of the connector. Use only the specified fuse value and
type.
3.7.4 Expansion port
An expansion port connector is provided on the rear panel. The connector enables up to four
CTS5000 switchboxes to be used to expand the number of input connections to provide up to
64 additional channels.
ASL operating instructions, model CTR5000
31
CTR5000 Operating Instructions
The connector is a (1:1) 15 way socket for signal, power and data connection to the CTS50008 or CTS5000-16 switchboxes. It is not compatible with any other connection.
Note
The 15 way expansion connector must only be used
with CTS5000-8 or CTS5000-16 switchboxes. It is NOT
compatible with SB148 & SB158 switchboxes.
A 0.5m lead is supplied as standard. Longer lengths may be used, but system accuracy and
the noise specification may be compromised.
3.7.5 USB Communication interface connector
The USB connector is fitted as standard. Communication requires the installation of the USB
driver on a PC14. See the separate information supplied on the CD and at the back of the
manual. A standard USB cable is supplied with the instrument.
The instrument can be controlled through simple ASCII commands and can transmit ASCII
result-data, which may be recorded using a simple terminal program or using ASL’s ULOG
program.
The standard F250 command set is supported. See the section on communications for further
details.
3.7.6 RS232/LAN/IEEE 488 Communication interface connector
The CTR5000 may (optionally) be fitted with one of these interfaces. Operation is similar for all
communication interfaces. See the chapter of communications for further details. The
optional interface and USB connection may be used simultaneously. However, when sending
commands to the CTR5000, operation will depend on timing and may not provide the
expected sequence of operation.
14
32
Many PCs now have this driver installed as standard.
ASL operating instructions, model CTR5000
CTR5000 Operating Instructions
This page is intentionally left blank
ASL operating instructions, model CTR5000
33
CTR5000 Operating Instructions
4. Operating the CTR5000
4.1 Instrument operating modes
The instrument has two operating modes –

Measurement Mode - displays the reading and instrument status

Menu Mode - allows operating parameters to be viewed and changed
4.2 Measurement mode
In Measurement Mode, the screen displays the current reading (its units - resistance or
temperature); it also displays the current channel, assigned probe and the time of day. This is
the normal operating display mode for the CTR5000. The normal display will look similar to the
one shown below –
Channel
Current value
Icons
Soft keys (6)
Conversion method
ITS-90
ChA
Currently assigned probe
Pb08 12:02:03
C
Esc
130•421
Zero
Current units
Menu

Chan
Time
Hold
Unit
CTR5000 display screen
The currently selected channel is always shown at the top left of the display, followed by the
temperature conversion method and the number of the probe currently attached to this
channel. The unit’s symbol alternates (toggles on or off) every time a new reading is
displayed.
This display always reflects the operation of the instrument, showing the current reading and
settings. There are four soft-keys under the display. Two more soft-keys are positioned to the
34
ASL operating instructions, model CTR5000
CTR5000 Operating Instructions
right of the display. The action of these keys is context sensitive – i.e. their action depends on
the text next to them on the screen. In measurement mode, the display may be set to show –

the normal numeric display screen

the larger result screen

the statistical result screen

the graphical result screen
Examples of each display are –
ChA
ITS-90
Smart 12:12:04
C
-
ChA
ITS-90
Hold
Unit
Pb08 15:12:22
400.118 
Chan
ChA
Zero
ITS-90
Hold
Unit
Pb08 18:33:41
Esc
0.523
Mn= 400.000
; Mx= 400.119
Av= 400.058
;  = 0.01
n = 697
Chan
13  211
2
C
Menu
Zero
Pb08 14:02:03
Esc
130• 411
Chan
ITS-90
ChA



Menu
0.477
Clr
Hold
Unit
Chan
Clr
x1
Unit
CTR5000 display modes
Use the blue key
on the numeric key pad to select one of these display modes. The
various operating modes are covered in more detail later on in this section.
Note
The Menu and Esc keys are still active when the
Statistical, Graphical or Large mode screens are
selected (the legends are overlaid to allow increased
display area).
ASL operating instructions, model CTR5000
35
CTR5000 Operating Instructions
4.3 Setting the instrument’s operating conditions
Commonly used function keys are available all the time in measurement mode. These keys
are used to select the instrument’s operating mode. For example, press the Unit key and the
display will change from –
ChA ITS90
Pb09
12:02:03
C
132•041
Chan
Zero
Hold
Esc
1
2
3
4
5
6
7
8
9
0

1
2
3
4
5
6
7
8
9
0

Menu
Unit
To the following –
ChA ITS90
Pb09
12:02:03
F
269•674
Chan
Zero
Hold
Esc
Menu
Unit
Pressing the key once more will display the result in kelvin; pressing it again will change the
display to ohms; one more press will return to the celsius display15. The following units are
available –
15
The Unit soft-key is shown highlighted in this example. This indicates that the current units are not the same as the pre-
programmed units of the attached Passive or Smart probe. This feature is only an indication - it has no other
significance.
36
ASL operating instructions, model CTR5000
CTR5000 Operating Instructions
Unit
Function
Ω
Display ohms
C
Convert to celsius and display
F
Convert to farenheit and display
K
Convert to kelvin and display
4.3.1 Hold key
Pressing the Hold key will change the display to –
ChA ITS90
Pb09
12:02:03
C
132•041
Chan
Zero
Hold
Esc
1
2
3
4
5
6
7
8
9
0

Menu
Unit
The reading is frozen (indicated by the highlighted Hold key). Note that Hold and Zero keys
can be active simultaneously.
4.3.2 Zero key
Pressing the Zero key will change the display to –
ChA ITS90
Pb09
12:02:03
C
0•000
Chan
Zero
Hold
Esc
1
2
3
4
5
6
7
8
9
0

Menu
Unit
The reading is zeroed (indicated by the highlighted Zero key). Note that Hold and Zero keys
can be active simultaneously.
ASL operating instructions, model CTR5000
37
CTR5000 Operating Instructions
4.3.3 Resolution
Press the blue display
key. The bottom line of the LCD will change to display –
Full
Stats
Graph
n.nnn
Press the n.nnn key to change the display resolution between 0 and 3 decimal places (0 and
4 decimal places for resistance).
The following resolutions are available –
Resolution
Function
n.nnnn
Display four decimal places (resistance only)
n.nnn
Display three decimal places
n.nn
Display two decimal places
n,n
Display one decimal place
n.
Display no decimal places
4.3.4 Display key
The display key is used to change display modes (between normal, large, statistical or
graphic) and to change instrument resolution.
4.3.4.1 Normal display
This is the normal display mode for the instrument. The blue display key is used to change
display modes and to allow the result resolution to be set.
4.3.4.2 Full display
Pressing the blue display key will change the display to show –
38
ASL operating instructions, model CTR5000
CTR5000 Operating Instructions
ChA ITS90
Pb09
12:02:03
C
132•041
Full
Stats
Graph
Esc
1
2
3
4
5
6
7
8
9
0

Menu
n.nnn
The Full key will select the large display mode (shown in section 4.2), returning to the
measurement screen. Press the display key and select Norm to return to the normal display
mode.
4.3.4.3 Statistical display
Press the blue display key and then the Stats key and the display will be similar to –
ChA ITS90
Pb09
12:02:03
400.118 
Mn= 400.000
; Mx= 400.119
Av= 400.058
;  = 0.01
n = 697
Chan
Clr
Hold
Unit
1
2
3
4
5
6
7
8
9
0

The bottom line of the LCD is similar to the Norm screen, but the zero soft-key has been replaced
by Clr. Pressing the Clr soft-key will ask for confirmation that you want to clear (reset) the
statistics.
Note that the Esc and Menu soft-keys are still active.
Press the blue display key to select an alternative display mode.
ASL operating instructions, model CTR5000
39
CTR5000 Operating Instructions
4.3.4.4 Graphical display
Press the blue display key and then the Graph key and the display will be similar to –
ChA ITS90
Pb09
12:02:03
C
0.523
Esc



Menu
0.477
Chan
Clr
x1
1
2
3
4
5
6
7
8
9
0

Unit
The bottom line of the LCD is similar to the Norm screen, but the zero soft-key has been replaced
by Clr and the hold soft-key by the scale factor x1.
Pressing the Clr soft-key will clear (reset) the graph.
Pressing the x1 key will change scale, circulating through x1, x10, x100, and x0.1.
Press the blue display key to select an alternative display mode.
4.3.5 Channel soft-key
This is described in full detail in section 4.5.
40
ASL operating instructions, model CTR5000
CTR5000 Operating Instructions
4.3.6 Editor
Several soft-keys are used during editing and data entry. An example of using the editor to
change a coefficient is shown below –
ChA ITS90
Smart
12:02:03
Esc
Ap= to
+ 3.9080
3 Send
commsx 10
- 03


1
2
3
4
5
6
7
8
9
0

+/-
A flashing cursor is positioned below the + sign when the screen first appears. The flashing
cursor indicates the current edit position.
The +/- soft-key is used to toggle (alternate) the sign. The +/- soft-key will only appear when
the cursor is under a sign character. If pressed16, the cursor will automatically advance to the
next position (or the  soft-key can be used to move the cursor position one place to the
right). Once moved the bottom line of the display will change to –



The cursor position can also be moved to the left now. The +/- sign is no longer active. The
editor deals with fixed length coefficients. The decimal place and x10 positions will be
automatically skipped. When the cursor is at the end of the number (last exponent digit), the
bottom line of the LCD will show –


Once the coefficient has been correctly entered, press the enter key (  ) to selected the
edited number or press the Esc key to return without changing the value.
Strings (e.g. the Probe id field) are edited in a similar way.
16
Keys auto-repeat.
ASL operating instructions, model CTR5000
41
CTR5000 Operating Instructions
4.4 Menu mode
The exact appearances of the menus depend on the options fitted to the CTR5000. For
example, if a RS232 interface is fitted, the communication and other relevant menus will
change to reflect this; similarly, channel menu options reflect the number of additional
channels fitted. All options are automatically detected, and so the menus will always reflect
the exact configuration for your instrument.
4.4.1 Menu soft-key
All other instrument parameters and options are accessed through the Menu soft-key. These
menus may display additional sub-menus.
Pressing the Menu soft-key will change the display to menu mode –
ChA ITS90

1
2
3
4
5
Pb09
12:02:03
Logging…
Probes…
Rs resistor…
Calibration…
Smart probe…
Esc



1
2
3
4
5
6
7
8
9
0

1
2
3
4
5
6
7
8
9
0

PgDn
Small arrow indicates
that there are more
menu items
Pressing the down arrow () will show the following –
ChA ITS90
1
 2
3
4
5
12:02:03
Logging…
Probes…
Rs resistor…
Calibration…
Smart probe…

42
Pb09

Esc


PgUp
PgDn
ASL operating instructions, model CTR5000
CTR5000 Operating Instructions
The line selection arrow has moved down one line and the  arrow, and PgUp legends have
appeared.
Use the up and down arrows ( and ) to scroll through the display. The PgUp and PgDn keys
will move the menu select indicator by 5 lines (or as many as possible).
Scroll the display to select the required menu (or alternatively, use the numeric keypad to
directly select the menu by number).
Press the enter key (  ) to selected the highlighted line or press the Esc key to return without
changing the current selection.
There are more menu items than can be shown on the screen at one time. The display will
scroll up and down through the list allow the required menu to be selected17. For example
pressing the PgDn soft-key will lead to the display –
ChA ITS90
Pb09
12:02:03
6 Utilities…
7 Options…
8 Comms…
9 Time/Date…
 10 Contrast


ChA ITS90
Esc

PgUp
Pb09
17

2
3
4
5
6
7
8
9
0

1
2
3
4
5
6
7
8
9
0

PgDn
12:02:03
7 Options…
8 Comms…
9 Time/Date…
10 Contrast
 11 Diagnostics

1
Esc

PgUp
PgDn
A small down arrow will be shown at the bottom right of the menu screen when additional menu options are available.
ASL operating instructions, model CTR5000
43
CTR5000 Operating Instructions
The menu options are shown below18 –
Menu item
Function
Logging…
Logging menu and options
Probes……
Enter probe information and coefficients
Rs resistor……
Set Rs resistor value
Calibration……
Reference resistor and instrument calibration
Smart probes……
View and edit smart probe parameters
Utilities……
Utility menus
Options……
Instrument options menu
Comms……
Set and/or review communication options
Time/Date……
Set time and/or date
Contrast…
Set LCD contrast
Diagnostics……
Instrument diagnostics menu (password protected)
For example, selecting Probes… will show –
ChA ITS90

1
2
3
4
5
Pb09
Probe number…
Probe group 1
Probe group 2
Probe group 3
Set group conv…

12:02:03
Esc
1
2
3
4
5
6
7
8
9
0


PgDn
Note
The instrument continues to measure normally during all menu
displays and selection options. The graph is frozen.
18
The three dots (…) after the legend indicate that there are more menu available for this item
44
ASL operating instructions, model CTR5000
CTR5000 Operating Instructions
Selecting channels
The following sections cover channel selection with the basic instrument and also when one
or more switchboxes are attached. The top left of the screen will always show the currently
selected channel. There are two ways to select a new channel.
4.4.2 Channel selection – method 1
With the screen in measurement mode, use the numeric keypad to enter a one or two digit
channel number and press the numeric keypad enter ( ) key. Channel A is selected by
entering 1 (or 01), Channel B by entering 2 (or 02) and so on19 –
Channel
Channel number
A
B
C (if fitted)
D (if fitted)
E (if fitted)
F (if fitted)
1
2
3
4
5
6
A minus B
B minus A
A alternating with B
A divided by B
A minus X
B minus Y
8
9
10
11
12
13
where X = B, C, D, E, F or any switchbox channel
where Y = A, C, D, E, F or any switchbox channel
Switchbox channels are selected by entering their channel numbers20 –
Switchbox
CTS5000-16
channel number
CTS5000-8
channel number
16 – 31
32 – 47
48 – 63
64 – 79
16 - 23
32 - 39
48 - 55
62 - 71
1
2
3
4
See the section on switchboxes for further details.
19
A flashing Cnxx will be shown at the top left of the screen when channel data is entered this way.
20
CTS50002-16’s and CTS5000-8’s may be mixed in any order. However, for ease of use, it is advisable to provide consecutive
addresses.
ASL operating instructions, model CTR5000
45
CTR5000 Operating Instructions
4.4.3 Channel selection – method 2
Use the Chan soft-key. Press the Chan key. The display will change to –
ChA ITS90
Pb09
12:02:03
C
132•041
Ch A
Ch B
More
Esc
1
2
3
4
5
6
7
8
9
0

Menu
Diff
Channel A is currently selected (see top left of LCD). Press the Ch B soft-key to change to
channel B; the display will change back to the previous screen.
Note
The More soft-key will only be displayed if more than two
channels are fitted. Its use will be covered below.
The More menu allows an alternative means of switchbox
channel selection (see the switchbox section).
When more than two channels are fitted, the exact appearance of the More display depends
on the number of channels fitted. For example, if channels C and D are fitted, pressing the
More soft-key will show –
ChA ITS90

Pb09
1 Sel chan C
2 Sel chan D
12:02:03
Esc


46
PgDn
1
2
3
4
5
6
7
8
9
0

ASL operating instructions, model CTR5000
CTR5000 Operating Instructions
4.4.4 Difference channel selection
The Diff key is used to select the differential operating modes. Again, its exact appearance
depends on the number of channels present –
ChA ITS90

Pb09
1 Sel (A – B)
2 Sel (B – A)
12:02:03
Esc


1
2
3
4
5
6
7
8
9
0

PgDn
When more than 2 channels are fitted, the difference menu will look similar to –
ChA ITS90

1
2
3
4
Sel
Sel
Sel
Sel
Pb09
(A – B)
(B – A)
(A – X)
(B – Y)

12:02:03
Esc

PgDn
1
2
3
4
5
6
7
8
9
0

Menu item 3 Sel (A – X) selects a difference reading between channel A and another
CTR5000 channel21. Similarly, menu item 4 Sel (B – Y) selects a difference reading between
channel B and another CTR5000 channel. For example selecting menu 3 Sel (A – X) will
display the following –
21
Difference modes are also supported for switchbox channels.
ASL operating instructions, model CTR5000
47
CTR5000 Operating Instructions
ChA ITS90
Smart
12:02:03
Esc
Channel
= 02
3 Send
to comms


1
2
3
4
5
6
7
8
9
0

Chan number
The screen allows entry of the X channel for the difference mode (the channels are
referenced by their channel numbers). Use the numeric keypad and cursor keys to enter a
two digit channel number for the difference calculation (see the section on editing numbers
for more details on this).
Note
The difference can be calculated between any two valid CTR5000 channels.
An error message will be displayed if the channel is not available.
Note
Smart probes take time to read their stored information. The Smart probe
’read on channel change’ is disabled once a difference mode is selected. To
change probes, select a single channel before reselecting a difference mode
with Smart probes.
48
ASL operating instructions, model CTR5000
CTR5000 Operating Instructions
4.4.5 Channel selection with CTS5000-8 and CTS5000-16 switchboxes
This section applies to instruments with one or more switchboxes.
Switchboxes are detected at power-on and are daisy-chained22. Addresses are assigned in
order, so the first switchbox connected to the CTR5000 will start with the lowest address.
The LED next to the connector will be illuminated when a switchbox channel is selected.
Switchboxes need not be adjacent to the CTR5000, connections of several meters are
possible. Also, switchboxes may have several metres of cable interconnecting them.
However, signal noise may increase when long cables are used.
There are three ways of changing the current switchbox channel –

Method A – by using numerical keypad, as described previously

Method B – by using the Chan soft-key

Method C – by using the Enter key on the numeric keypad
4.4.5.1 Method A
The first channel on the first switchbox starts at address 16; the first channel on the second
switchbox starts at address 32 (and so on). Switchbox addresses are assigned in the order
switchboxes are connected to the CTR5000. Unused addresses will be ignored on 8 channel
switchboxes. Addresses are –
First switchbox –
Channel
Numerical address
1
2
16
16
17
31
Channel
Numerical address
1
2
16
32
33
-47
Second switchbox –
22
The first switchbox connects to the CTR5000, a second to the first switchbox and so on.
ASL operating instructions, model CTR5000
49
CTR5000 Operating Instructions
Third switchbox –
Channel
Numerical address
1
2
16
48
49
63
Channel
Numerical address
1
2
16
64
65
71
Fourth switchbox –
4.4.5.2 Method B
Press the Chan soft-key and then the More soft-key. The display will change to23 –
ChA ITS90

Pb09
12:02:03
1 Sel chan CTS5000
2 Internal channels
Esc



PgDn
1
2
3
4
5
6
7
8
9
0

Select the Sel chan CTS5000 menu option and press one of the  enter keys. The display will
change (depending on the number of switchboxes fitted) to –
23
50
The exact appearance of the display will depend on which additional channels are fitted to the instrument
ASL operating instructions, model CTR5000
CTR5000 Operating Instructions
ChA ITS90

Pb09
12:02:03
1 CTS5000/16 (16 –
31)CTS5000/16 (32 –
2
47)
Esc


1
2
3
4
5
6
7
8
9
0

PgDn
Select the first menu 1 CTS5000/16 (16 – 31) with one of the enter keys, and the display will
change to show the message Surveying. The CTR5000 will take a few seconds to check the
switchbox(es) for Smart probes. The screen will then show the layout of the switchbox –
12:02:03
SB16
0
1
2
3
4
5
6
7
Esc
24
       
16
       

No probe assigned




1
2
3
4
5
6
7
8
9
0

Detail
In this example, the display has changed to show a graphical representation of the first 16
channel switchbox, arranged in the same physical layout as the switchbox itself. The square
 covering channel 16 is the currently addressed channel (shown at the top left of the
display). Use the  ,  and 
(up/down) soft-keys to move to the required switchbox
channel and press the enter key ( ) to select it. Alternatively, press the Detail soft-key to
view details for the current cursor channel (type of probe and coefficients).
Note
The circle () will be replaced by a highlighted S, D, d, C or I
(assigned probe type) if the channel has a probe assigned to it.
The bottom line will show the attached probe number.
For example –
ASL operating instructions, model CTR5000
51
CTR5000 Operating Instructions
12:02:03
SB25
0
1
2
3
4
5
6
7
Esc
24
 D      
16
       

Assigned Pb = 21




Detail
1
2
3
4
5
6
7
8
9
0

The probe possible symbols are listed in the table below –
Symbol
Conversion method
S
Smart probe
D
DIN90
d
DIN68
C
CvD
I
ITS90
4.4.5.3 Method C
Press the Chan soft-key and then the More soft-key. The display will change to24 –
ChA ITS90
Pb09
12:02:03
C
132•041

24
52
CTR5
000

l
CTS5
000
Esc
1
2
3
4
5
6
7
8
9
0

Menu
l
The exact appearance of the display will depend on which additional channels are fitted to the instrument
ASL operating instructions, model CTR5000
CTR5000 Operating Instructions
The arrow soft-keys will move through sequential channels. The keys auto-repeat. Press the
Esc key to exit.
Note
Switchbox connections are determined dynamically by
the instrument at power-on. The CTR5000 menus will
always change automatically to show the current
connection configuration.
Warning
Do NOT plug or unplug switchboxes when the CTR5000 is
powered
ASL operating instructions, model CTR5000
53
CTR5000 Operating Instructions
4.5 Logging menu
The CTR5000 can log (record) data points. Two logging methods are possible –

Internal – up to 8000 data points held in internal non-volatile memory

External – up to 65000 data points
Once the internal log has stored data, it may be viewed on the LCD or sent to external
communications interfaces. The memory is non-volatile so that, once recorded, the log is
available until it is overwritten25.
The options for external logging depend on the interfaces fitted to the CTR5000. As a
minimum, this includes the USB data link.
The CTR5000 can also scan a preset sequence of channels when one or more CTS5000
switch-boxes are fitted. Scanning is covered at the end of the logging section.
Note
The CTR5000 logs the currently selected channel
4.5.1 Internal logging menu
Select the Logging menu Menu  1 Logging…  
(i.e. the Menu key, then Logging…
(default), then the enter key ( ) and the screen will look like –
ChA ITS90

Pb09
1 Log Internal
2 Log external
3 Interval (2s)
12:02:03
Esc


25
PgDn
1
2
3
4
5
6
7
8
9
0

There is no clear log option available. Data remains in the log until the next logging session.
54
ASL operating instructions, model CTR5000
CTR5000 Operating Instructions
Selecting Logging… will show –
ChA ITS90

Pb09
1 Log Internal
2 Log external
3 Interval (2s)
12:02:03
Esc


1
2
3
4
5
6
7
8
9
0

PgDn
Once some data points have been logged, this menu screen will change to –
ChA ITS90

1
2
3
4
5
Pb09
Log Internal
Log external
Interval (2s)
View int log
Xmit log

12:02:03
Esc

PgDn
1
2
3
4
5
6
7
8
9
0

Two more menu items appear, allowing the internal log to be viewed on the LCD or sent to an
external interface device. The measurement screen will show the internal log icon (see
section 4.2).
4.5.2 Internal logging screen
The screen below shows the display when internal logging is taking place –
ASL operating instructions, model CTR5000
55
CTR5000 Operating Instructions
ChA ITS90
Pb09
12:02:03
C
Esc
132•041
Stop

1
2
3
4
5
6
7
8
9
0

7202
Pt:
Number of
points in log
Log to internal
memory
Flashing Stop. Press
key to stop logging
Log progress
bar
4.5.2.1 Logging interval
The default logging interval is 2 seconds; the current interval is shown after the menu item. The
log interval may be set between 1 and 99 seconds or between 1 minute and 99 minutes.
Select 3 Interval to set the logging interval –
ChA ITS90

1
2
3
4
5
Pb09
1 seconds
5 seconds
10 seconds
Set seconds
Set minutes

12:02:03
Esc

PgDn
1
2
3
4
5
6
7
8
9
0

Select the required interval from one of the preset times or enter other intervals using the Set
seconds or Set minutes menu options.
Note
The logging interval is also used when scanning
56
ASL operating instructions, model CTR5000
CTR5000 Operating Instructions
4.5.2.2 View int log
The internal log may be viewed on the CTR5000 LCD. Select Menu  1 Logging…  View int
log
to see the log. The initial screen will show details of the log – time, interval etc –
Log details
DIN68: Units
On: 20/02/10 08:32:01
RChan: A
Probe:
--------s
DIN90;
Pts:
Ref R:
321 ;
100Ω
Interval
2s
1
2
3
4
5
6
7
8
9
0

1
2
3
4
5
6
7
8
9
0

Next
Indicates Smart
probe attached to
channel
Press Next to view the log –
ChA ITS90
Pb09
0001: 150.452C
seconds
0002: 150.452C
seconds150.452C
0003:
seconds
0004: 150.452C
seconds150.452C
0005:
seconds

12:02:03
Esc
goto

PgDn
The log is displayed. The soft keys on the bottom line are used to scroll through the log. These
keys will accelerate the log display if they are held down, enabling the whole log to be
navigated in a relatively short time. Alternatively, the goto soft-key will allow a log entry
number to be entered and jumped to.
ASL operating instructions, model CTR5000
57
CTR5000 Operating Instructions
4.5.2.3 Xmit Int log
The internal log may be transmitted to a variety of interfaces (the exact appearance of the
screen will depend on the attached interfaces). Select the sequence Menu  1 Logging… 
1 Xmit log…  
. The Xmit log… screen will look like –
ChA ITS90

Pb09
1 Send to PC
2 Send to RS232
12:02:03
Esc


1
2
3
4
5
6
7
8
9
0

PgDn
Select the required destination for the log and press Enter to transmit it. The log may be retransmitted any number of times (until it is overwritten).
Note
Transmission times may be quite long, depending on the
number of points logged. For example, a 1000 point log will
transmit approximately 20 000 characters taking about 50
seconds.
4.5.3 External logging
Select Menu  1 Logging…  1 Log external…  
to log to an external device. This will
show a menu similar to the one below. The exact appeiarance will depend on which
interfaces are fitted –
58
ASL operating instructions, model CTR5000
CTR5000 Operating Instructions
ChA ITS90

Pb09
12:02:03
1 Send to PC
2 Send to RS232
Esc


1
2
3
4
5
6
7
8
9
0

1
2
3
4
5
6
7
8
9
0

PgDn
Select the required destination for the log and press Enter.
4.5.4 External logging screen
The display below shows the CTR5000 logging to external USB –
ChA ITS90
Pb09
12:02:03
C
Esc
132•041
Stop
Pt:
Flashing Stop. Press
key to stop logging

10540
Logging icon
Log progress
bar
The display will be similar for other external logging options.
4.5.5 Logging limitations
There are some common limitations that apply whilst logging –

All front panel keys (except for Stop soft-key) are inactive

No external PC communications allowed (an error message will be generated on the
communicating )
ASL operating instructions, model CTR5000
59
CTR5000 Operating Instructions

The Smart and probe status for the channel and probe information will be frozen – i.e.
any change of probe coefficients or settings will not register during logging. Only
probes with identical settings will work correctly if changed during logging
4.5.6 Scanning
The CTR5000 is capable of automatically scanning through switch box channels. Channels
are selected automatically and logged. In all other respects, scanning is similar to logging.
Scanning enable, and start and end scan channels are set up from the More menu on the
channels selection soft-key –
ChA ITS90
Pb09
12:02:03
C
132•041
Ch A
Ch B
More
Esc
1
2
3
4
5
6
7
8
9
0

Menu
Diff
Note
The More soft-key will only be displayed if more than two
channels are fitted.
When more than two channels are fitted, the exact appearance of the More display depends
on the number of channels fitted. For example, if channels C and D are fitted, pressing the
More soft-key will show –
60
ASL operating instructions, model CTR5000
CTR5000 Operating Instructions
ChA ITS90

1
2
3
4
5
Pb09
Sel chan C
Sel chan D
Sel chan CTS5000
Internal channels
Scan setup…

12:02:03
Esc

1
2
3
4
5
6
7
8
9
0

1
2
3
4
5
6
7
8
9
0

PgDn
Select the Scan setup… menu to show the following screen –
ChA ITS90

1
2
3
4
Pb09
Scan enable
Scan disable ()
Start chan (16)
End chan (23)

12:02:03
Esc

PgDn
The first two menus enable and disable scanning during logging (disabled by default),
Selecting the third menu item allows the start channel to be set and selecting the last menu
sets the end channel. The CTR5000 will not allow the start and end channels to overlap.
Scanning (if enabled) will take place when logging is started.
Note
As with single channel logging, probe settings are frozen when
logging starts
ASL operating instructions, model CTR5000
61
CTR5000 Operating Instructions
4.5.7 Channel and probes
The CTR5000 needs to know what temperature conversion method (and coefficients) to use as
different channels are selected.
Note
There is a fundamental difference between the F250 and
CTR5000. The F250 allowed coefficient data to be entered for a
channel. The CTR5000 is NOT the same. See below.
The CTR5000 allows the coefficient data (and units, etc) to be entered for one of 72 probes.
The probe is then assigned to a particular channel. Once assigned to the channel, the data
for that probe is used. This is a far more flexible system; probes may assigned or unassigned
at will without other entered data being lost.
When the channel is changed, the instrument will check to see if a probe number has been
assigned to the new channel. If it has, it will use the conversion method set-up for he assigned
probe. If no probe has been assigned, then the CTR5000 will only display the probes
resistance or use the default DIN90 conversion method to display temperature26.
Note
The instrument will always use valid smart-probe parameters to
over-ride the assigned probe when a smart probe is detected
on a channel.
Any combination of Passive and Smart probes may be mixed on the CTR5000 and
switchboxes.
Note
When first supplied, for convenience only, Probe1 is attached
to channel 1(A) and so on for all the internal channels fitted.
Similarly, Probes 16 to 31 are attached to the first switchbox
channels. Default DIN settings are used.
26
There is no need to enter the maximum/minimum temperatures for the CTR5000. These are defined by the conversion
method. The screen will display a warning if the temperatures are outside the valid conversion range –e.g. t> tmax
62
ASL operating instructions, model CTR5000
CTR5000 Operating Instructions
4.5.8 Probe review and edit
Up to 72 probes may be defined and stored by the CTR5000. Each probe number (1 to 72) can
be entered or edited to define its conversion method, coefficients used, resistance and probe
id string. Once defined, a probe may be assigned to a channel so that when this channel is
selected, the probe’s data will be used. The probes are defined and reviewed using the menu
system.
For convenience, probes are divided into three groups. Each group has 24 probes - the
grouping has no other significance.
A probe id string (up to 10 characters long) may be given to each probe. Characters must be
numeric when entered from the CTR5000 editor. However, alpha-numeric data can be
entered through a data link (e.g. USB) using the N command (see the communications
section). The id string can be reviewed or edited (numerical characters only) on the CTR5000.
The string will be reproduced on a probe report.
4.5.8.1 Probe menu
This menu is used to select and edit probes.
Select the Probe menu Menu  2 Probes…  
(i.e. the Menu key, then Probes, then the
enter key ( ) and the screen will look like –
ChA ITS90

1
2
3
4
5
Pb09
Probe number…
Probe group 1
Probe group 2
Probe group 3
Set group conv…

12:02:03
Esc
1
2
3
4
5
6
7
8
9
0


PgDn
The first menu option allows a probe to be selected by number via the numeric keypad. The
remainder of the menu options allow probes to be selected from a group. Three groups of 24
probes are selectable to make it easier to remember where any particular probe is. Finally,
for convenience, all probes in a group may be set to have the same temperature conversion
method (Set group conv… menu)
ASL operating instructions, model CTR5000
63
CTR5000 Operating Instructions
4.5.8.2 Probe selection (individual)
Use the first menu (Probe number…) to select an individual probe for review/editing. The
screen will be similar to –
ChA ITS90
Smart
12:02:03
Esc
Probe
no = 16
3 Send
to comms


Probe no?
1
2
3
4
5
6
7
8
9
0

The last selected probe (16 in the example) will be shown. Press the enter key ( ) to select
this probe, or change the number to the required probe and then press enter. This probe will
be selected for review or editing.
4.5.8.3 Probe groups menu (from group)
Select one of the probe groups and the next screen will show (second group selected in this
example) –
Pb08 12:02:03
ITS-90
ChA
Pb01
0
1
3
4
5
1
I
D D D
D
C D D
9
D d
D D
C D
17
D D
D D
D

2

6
D
7
Esc
d
D D D




Detail
The top left of the probe screen shows the cursor over probe 1 (Pb01). The editing (arrow) softkeys are used to move the cursor to the desired probe number (current probe selection is
indicated at the top left of the screen). The majority of the probes have not been defined and
are currently set to the default of DIN90 (D).
64
ASL operating instructions, model CTR5000
CTR5000 Operating Instructions
The I character under the cursor indicates that this probe has been defined to use ITS90 as its
conversion method (but not assigned to any particular channel). The reverse video
background d (probe 16) indicates that this probe is in use – i.e. attached to a channel.
Other letters indicate probe conversion methods (for example probe 10 is defined as a DIN68
probe). The codes are –
Symbol
Code

Probe attached when reverse video
D
Probe defined as DIN90
d
Probe defined as DIN68
C
Probe defined as CvD
I
Probe defined as ITS90
Information for any particular probe (once the cursor is over it) can be viewed using the
Detail soft-key. For example, assuming the cursor has been moved to Pb16, pressing the
Detail soft-key will show a screen similar to –
Assigned to Ch 16
Passiv e DIN68:
+100.0000
-5.80200-07
Pb 16
Unit s RDIN68:
Units R
+3.90802-03
-4.27350-12
Back
1
2
3
4
5
6
7
8
9
0

Press the Back soft-key to return to the previous screen.
Once the cursor is over the required probe, press the enter key ( ) to select this probe
number for review or editing.
ASL operating instructions, model CTR5000
65
CTR5000 Operating Instructions
4.5.9 Probe review and editing
The probe menu screen is shown below. Each of the menu items on this screen will be
covered in more detail. The currently selected probe number and conversion type is shown
on the bottom right of the LCD. The exact appearance of this menu will depend on the
conversion method. The coefficients cannot be changed for the DIN68 method, so the Edit
coeffs menu is not available (normally follows View coeffs).
ChA ITS90

1
2
3
4
5
Pb09
12:02:03
Conversion…
Review coeffs
Probe id….
Unassgn from Ch16
Set units

Esc
1
2
3
4
5
6
7
8
9
0


Pb 16 DIN68
The menu items (following
the first five) are shown here
6 Set probe Tmax
7 Set probe Tmin
8 Copy probe
A summary is shown in the tables below for fixed and editable coefficients–
Probe menu example with fixed coefficients – DIN, CvD and DIN68
Menu item
Description
Notes
1 Conversion…
Select conversion method
DIN90, CvD, ITS90 or DIN68
2 Review coeffs
View the coefficients
For currently selected method
View and/or edit the Probe id string
Up to 10 characters
Unassign from channel 16
DIN defaults restored
Set the initial units
Used on channel (probe) select
6 Set probe Tmax
Set the probe upper temperature limit
Default set to DIN limits
7 Set probe Tmin
Set the probe lower temperature limit
Default set to DIN limits
8 Copy probe
Copy current probe settings to another
Channel assignment unchanged
3 Probe id…
4 Unasgn from Ch16
5 Set units…
66
ASL operating instructions, model CTR5000
CTR5000 Operating Instructions
Probe menu example with variable coefficients – ITS90
Menu item
Description
Notes
1 Conversion…
Select conversion method
DIN90, CvD, ITS90 or DIN68
2 Review coeffs
View the coefficients
For currently selected method
Edit the methods coefficients
ITS90 only
View and/or edit the Probe id string
Up to 10 characters
3 Edit coeffs…
4 Probe id…
5 Assign to chan
Currently unassigned
6 Set units…
Set the initial units
Used on channel (probe) select
8 Set probe Tmax
Set the probe upper temperature limit
Default set to DIN limits
9 Set probe Tmin
Set the probe lower temperature limit
Default set to DIN limits
10 Copy probe
Copy current probe settings to another
Channel assignment unchanged
Each menu options is described below –
4.5.9.1 Conversion
The following screen will be displayed once the Conversion menu is selected –
ChA ITS90

1
2
3
4
5
Pb09
12:02:03
DIN90
CvD
ITS-90
Din (IEC751)
Data pairs…

Esc
1
2
3
4
5
6
7
8
9
0


Pb 16 ITS90
Use the editing arrows, or enter the menu number, to select the required conversion method.
The exact appearance of the previous screen will depend on whether the coefficients can be
changed.
The last menu item allows data-pair entry. This menu and its sub-menus provide coefficient
calculation after entering the required number of data-pairs. Use of this menu item will be
covered in a subsequent section.
ASL operating instructions, model CTR5000
67
CTR5000 Operating Instructions
Note
Selecting (or reselecting) a conversion method will reset the
coefficients to their default values.
68
ASL operating instructions, model CTR5000
CTR5000 Operating Instructions
4.5.9.2 Review coeffs
Shown below for the DIN90 method –
ChA ITS90

1
2
3
4
Pb09
R0
A90
B90
C90
12:02:03
=+100.0000
=+3.90830-3
= -5.77500-7
= -4.18300-12

Esc
1
2
3
4
5
6
7
8
9
0

1
2
3
4
5
6
7
8
9
0


Pb 16 DIN90
4.5.9.3 Edit coeffs
Shown below for the ITS-90 method –
ChA ITS90

1
2
3
4
5
Pb09
R0.01
Ap
Bp
Cp
Dp
12:02:03
=+100.0000
=+3.90830-3
= -5.77500-7
= -4.18300-12
= -4.18300-12

Esc


Pb 16 ITS90
Note that there are more than five coefficients in this example. Select one of the
coefficients (e.g. Ap) –
ASL operating instructions, model CTR5000
69
CTR5000 Operating Instructions
ChA ITS90
Smart
12:02:03
Esc
Ap= to
+ 3.9080
3 Send
commsx 10
- 03


1
2
3
4
5
6
7
8
9
0

+/-
Use the editor to change the value. The decimal place and x10 characters cannot be
changed, See the section on editing for more detail. Use the enter key ( ) to accept the
new coefficient or Esc key to leave it unchanged. Both keys return to the previous menu,
allowing other coefficients to be edited.
Note
There is no range checking on coefficients – they may be
changed to any value.
4.5.9.4 Probe id
`
ChA ITS90
Smart
12:02:03
Esc
Pb id to
= comms
ASL/123456
3 Send


70
Probe id
1
2
3
4
5
6
7
8
9
0

ASL operating instructions, model CTR5000
CTR5000 Operating Instructions
Use the editor to change the id (identifier) string. Up to 10 characters are available to use as a
probe id. Strings are empty to start with. Use the enter key ( ) to accept the change or Esc
key to leave it unchanged.
Note
The CTR5000 editor can only use numerical characters to
overwrite existing characters. However, other characters can
be entered using a data interface and the N command.
4.5.9.5 Assign to chan (Unasgn from)
Probes may be edited or set-up in any order.
A probe’s set of values will not be used until it is assigned to a channel. Once assigned, the
channel will use the programmed values every time that channel is selected.
Note that if a probe is already assigned, then this menu will instead read Unasgn from Chxx where the currently assigned channel xx is indicated.
Selecting the Assign to chan menu will show a screen similar to the following one –
ChA ITS90
Smart
12:02:03
Esc
Channel
= 01
3 Send
to comms


As s i g n P b
1
2
3
4
5
6
7
8
9
0

Use the editor to set the required channel and then use the enter key ( ) to accept the
value or the Esc key to leave it unchanged.
Once a probe has been assigned to a channel, the menu will change to, for example,
Unasgn from Ch01. Selecting this menu will unassign the probe. No warning message is given
since probes are simple to assign. DIN defaults will be restored.
ASL operating instructions, model CTR5000
71
CTR5000 Operating Instructions
4.5.9.6 Set units
Probes may have their units set. When the probe is assigned to a channel, these preprogrammed units are selected every time the channel is changed to the one with the
assigned probe.
Selecting this menu will display –
ChA ITS90

1
2
3
4
5
Pb09
Instrument units
Resistance
celsius
farenheit
kelvin

12:02:03
Esc
1
2
3
4
5
6
7
8
9
0


Pb 16 ?????
Indicating instrument
units are currently set
for probe 16
Instrument units are the default - when selected, the CTR5000 will use the current units rather
than changing to another on channel selection. The units can still be changed from the initial
units using the Unit menu – there is no other significance to the setting.
Select the required unit and then use the enter key ( ) to accept this or the Esc key to leave
the current state unchanged.
Finally, use the Esc soft-key to return to Measurement mode.
4.5.9.7 Set Probe Tmax
Probes may have a maximum temperature set for them (positive or negative). When the
probe is assigned to a channel, the probe’s temperature is checked against the set
maximum and a range error issued if the maximum temperature is exceed.
The temperature will still be displayed (it does not matter what the units are), but, if the buzzer
is enabled, a short, repetitive beep will be heard and the over-range icon  will flash on the
line below the result and the panel LED will flash red.
Selecting this menu will show a display similar to –
72
ASL operating instructions, model CTR5000
CTR5000 Operating Instructions
ChA ITS90
Smart
12:02:03
Esc
T max
+345.2
3 Send
to =comms


1
2
3
4
5
6
7
8
9
0

+/-
The default conversion limit will be set the first time this display is shown (range checking is not active
when Tmax is set to (or above) the limit.
Set the required limit and then use the enter key ( ) to accept this or the Esc key to leave the
current value unchanged.
4.5.9.8 Set Probe Tmin
Probes may have a minimum temperature set for them (positive or negative). When the probe is
assigned to a channel, the probe’s temperature is checked against the set minimum and a range
error issued if the minimum temperature is exceed.
The temperature will still be displayed (it does not matter what the units are), but, if the buzzer is
enabled, a short, repetitive beep will be heard and the under-range icon
 will flash on the line
below the result27 and the panel LED will flash red.
Se the Set Probe Tmax menu since data entry is very similar.
Note
The Tmax and Tmin limits can be set with a small ‘window’ if a
particular temperature needs to be monitored.
27
Note that the icons will only be displayed on the numerical display screen
ASL operating instructions, model CTR5000
73
CTR5000 Operating Instructions
4.5.9.9 Copy probe
The details of one probe may be copied to another using this menu. Once selected, the
screen will be similar to –
ChA ITS90
Pb05
12:02:03
Esc
Copyto
Pb01
t o = 00
3 Send
comms


1
2
3
4
5
6
7
8
9
0

Copy PB01 to
Enter the number of the probe you want to copy the current probe to and then use the enter
key ( ) to copy the probe details or use the Esc key to exit without any changes.
Note
All details, except the channel assignment, are copied to the
probe number selected.
4.5.10 Set group conversion
For convenience, all probes in a group may be set to the same conversion method. This
menu will prompt for the group number, then the conversion method (and then ask for
confirmation). All probes in the group will be set to the use the default conversion coefficients
for the method. The channel assignments, and probe id string are NOT changed. All other
parameters (e.g. units) are copied from the first probe of the group.
74
ASL operating instructions, model CTR5000
CTR5000 Operating Instructions
4.6 Reference resistors
The CTR5000 allows the choice between two internal reference resistors (25Ω and 100Ω). The
25 ohm resistor should only be used when a 25 ohm PRT (or lower) is used.
Note
Use the 100Ω reference resistor for all probes with R0 values
above 25 Ω
The CTR5000 automatically adjusts the PRT current (from 1 mA for the 100 ohm reference)
to 2 mA for the 25 ohm reference.
4.6.1 Reference resistor menu
From the measurement screen, select Menu  3 Rs Resistor…  
ChA ITS90

Pb09
12:02:03
1 Auto R
2 Use 25R
3 Use 100R
Esc



PgDn
1
2
3
4
5
6
7
8
9
0

Select the required reference resistor28.
4.6.1.1 Auto reference resistor
The menu allows the use of Auto R selection. The auto R selection looks at the R0 value of the
probe. If R0 is below 50 ohms, the 25 ohm reference is selected; any R0 value equal to or
above 50 ohms will use the 100 ohm reference. See the 7 Options… menu to allow the
reference value to be displayed (replaces the time display on the top right of LCD).
28
Note that the reference settings is ignored for Smart Probes - the reference resistor used is set as one of the parameters.
ASL operating instructions, model CTR5000
75
CTR5000 Operating Instructions
4.7 Calibration
It is vital to ensure the CTR5000 is correctly calibrated to obtain the most accurate results.
Good laboratory practice dictates that any instrument should be checked before and after a
day’s measurements.
Note
Regularly check calibration.
The CTR5000 contains very accurate and stable 25 Ω and 100Ω reference resistors. The exact
values of these resistors are found by comparing their ratio against traceable, external 25Ω
and 100Ω resistors. The results of the comparison are used to calculate the value of the
internal resistors – i.e. they are calibrated29. The CTR5000 needs other points to ensure that its
linearity specification is met across its full range30. The user calibration values are –

0Ω

25 Ω

100 Ω
A four terminal zero-ohm resistor is required together with traceable, calibrated resistors for
the 25 and 100 ohm points31.
The calibration procedure is simple and is partially automated. The procedure is described in
the following sections.
4.7.1 Calibration menu
From the measurement screen, select Menu  4 Calibration…  
The calibration menu is shown below –
29
It also contains another accurate 100Ω resistor for diagnostic purposes. The value of this resistor is stored when the
instrument is built and used at start-up to check performance at a ratio of 1:1.
30
Yearly recalibration by the agent or supplier is recommended
31
Both available from ASL
76
ASL operating instructions, model CTR5000
CTR5000 Operating Instructions
ChA ITS90
1
 2
3
4
5
Pb09
12:02:03
Calibrate 0R
Calibrate 25R
Set 25R ref
Calibrate 100R
Set 100R ref


Esc


PgUp
1
2
3
4
5
6
7
8
9
0

PgDn
6 Calibrate CTR5000
The procedure is the same for both calibration points. To illustrate calibration, only one value
will be covered.
It is only necessary to enter the true, calibrated value of the resistor used for the 25 ohm and
100 ohm calibration points. The 0 Ω resistor is assumed to be 0 ohms.
4.7.1.1 Calibration reference resistor
First, enter the calibration values for the 100 Ω resistor from its calibration certificate32.
Menu item 5 has been selected (100 Ω reference resistor) to show the reference value setting
–
ChA ITS90
Smart
12:02:03
Esc
Ref Rto= comms
099.99825
3 Send


32
Ref value?
1
2
3
4
5
6
7
8
9
0

The values of the external, calibrated reference resistors must be accurate to at least 4 decimal places to ensure
the CTR5000 is calibrated correctly. Less accurate resistors may be used, but the instrument accuracy will suffer
accordingly.
ASL operating instructions, model CTR5000
77
CTR5000 Operating Instructions
A spread of up to ±1 Ω is allowed for the resistors. Use the editor to set the calibrated value
and then use the enter key ( ) to accept this value or the Esc key to leave the current value
unchanged.
4.7.1.2 Calibration method
First, enter the calibration value for the 100 Ω resistor from its calibration certificate (see
previous section).
Menu item 4 has been selected (100 Ω calibration) to illustrate the procedure –
100R Calibration
●
●
Add 100R ref to ChA
Press enter when ready
1
2
3
4
5
6
7
8
9
0

Flashing LED
Note
Allow at least 40 minutes with power applied before
recalibration.
Note
For best accuracy calibrate the 100 ohm resistor before the 25
ohm resistor.
Follow the on-screen instructions, noting that the relevant external resistor must be connected
to channel A.
78
ASL operating instructions, model CTR5000
CTR5000 Operating Instructions
Use the enter key ( ) to accept this step and move on, or press the Esc key twice to abort
the procedure33. Using the enter key, the screen will change to –
100R Calibration
●
●
●
Add 100R ref to ChA
Press enter when ready
Measuring. .
1
2
3
4
5
6
7
8
9
0

Flashing LED (slow)
This will change to the following screen once the measurement check is complete –
100R Calibration
●
●
●
●
Add 100R ref to ChA
Press enter when ready
Measuring . . . . . . . . .
Averaging value . .
1
2
3
4
5
6
7
8
9
0

Flashing LED (slow)
Once the external reference resistor value has been checked, its value will be averaged
(note that the average measurement is performed twice). On completion, the screen will
show –
33
Use the Esc soft-key to abort the procedure at any time.
ASL operating instructions, model CTR5000
79
CTR5000 Operating Instructions
●
●
●
●
●
●
100R Calibration
Add 100R ref to ChA
Press enter when ready
Measuring . . . . . . . . .
Averaging value . . . . . . . . . . .
Value checked OK
Enter key to accept
1
2
3
4
5
6
7
8
9
0

Flashing LED (fast)
Use the enter key ( ) to accept this value, or press the Esc key ignore the calibration
measurement. The last line of the display will briefly show “Ref calibrated OK”.
Complete all calibration values.
4.7.1.3 Automatic instrument calibration
A CTS5000 switchbox is required with a set of calibrated resistors. Once started, the calibration
sequence is fully automated. Instrument calibration should be carried out yearly by the
supplier or agent. This menu item is password protected.
80
ASL operating instructions, model CTR5000
CTR5000 Operating Instructions
4.7.2 Smart probe menu
From the measurement screen, select Menu  5 Smart probe…  
The Smart probe menu is shown below –
ChB ITS90

1
2
3
4
Pb32
12:02:03
Disable
Review probe
Edit probe…
Reset defaults
Esc


1
2
3
4
5
6
7
8
9
0

PgDn
There are four menu items available. The first menu (1 Disable) disables all Smart probes. This
is indicated on the main screen by a crossed-out s –
ChA ITS90
Pb09
12:02:03
C
132•041
Esc
Ch B
More
2
3
4
5
6
7
8
9
0

Menu
$
Ch A
1
Diff
Smart probes
disabled
Once disabled, the Smart probe menu will change to show just –
 1 Enable SMPs
Select this to re-enable Smart probes (once disabled, Smart probes must be re-enabled to
use them again).
ASL operating instructions, model CTR5000
81
CTR5000 Operating Instructions
The 2 Review probe and 3 Edit probe… menus are very similar - the only difference is that the Smart
probe values cannot be changed during 2 Review probe; for this reason, only edit menu will be
covered.
Enter Menu  3 Edit probe  
to see the following menu for the Smart probe connected to the
current channel34 –
ChA ITS90

1
2
3
4
5
Pb09
12:02:03
Lock..
Serial no…
Cal date..
Next cal…
Source
Esc




6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Coeffs…
Convert type…
Rmin
Rmax
Cal min…
Cal max…
Min ever……
Max ever…
W ire type…
Probe type…
Version…
Units…
Reference R…
Reserved
Reserved
PgUp
PgDn
1
2
3
4
5
6
7
8
9
0

A detailed description for the Smart probe in the F200 User’s manual (on the CD provided).
Editing is similar to other menus.
34
A message showing No Smart probe Chnn will be briefly displayed if the current channel does not have a Smart
probe.
82
ASL operating instructions, model CTR5000
CTR5000 Operating Instructions
There are two fields that need more explanation –
1
Serial no…
The Smart probe serial number is normally 19 characters long. However, due to space limitation on
the LCD, the CTR5000 can only display 10 characters. Although only numerical values can be
entered from the editor, alpha-numeric characters can be displayed and overwritten. The data
comms N command can be used to enter any arbitrary string.
2
Source…
The Smart probe serial number is normally 17 characters long. However, due to space limitation on
the LCD, the CTR5000 can only display 10 characters. Although only numerical values can be
entered from the editor, alpha-numeric characters can be displayed and overwritten. The data
comms N command can be used to enter any arbitrary string.
4.7.2.1 Reset defaults menu
Use this menu to reset all the Smart probe data fields to their default values for the CTR5000. Select
the menu and respond to the Reset defaults? message.
Note
All data will be lost when the defaults are set - take care when
using this menu option.
4.7.3 Utilities menu
From the measurement screen, select Menu  6 Utilities…  
The Utilities menu is shown below –
ChB ITS90

1
2
3
4
5
Pb32
Channels…
Assigned Prbs…
All probes…
Instrument…
Smart probe…

ASL operating instructions, model CTR5000
12:02:03
Esc

PgDn
1
2
3
4
5
6
7
8
9
0

83
CTR5000 Operating Instructions
The last menu item 5 Smart probe… will only be present if a Smart probe is connected to the
currently selected channel.
The Utilities menu is used to view information or send reports to a data port. The options are
described below.
Utilities item
Description
Notes
1 Channels…
Send a channel report to a data port
Report available channels
2 Assigned Prbs…
Send a probe report to a data port
Report assigned probes only
3 All probes…
Send a probe report to a data port
Report all 72 probes
4 Instrument…
View or send instrument details to a
data port
5 Smart probe…
Send Smart probe report to a data port
Only available when Smart
probe connected
Once one of these menus is selected, various options for the report destinations are displayed
(the Instrument… menu is slightly different since the report can be viewed on the LCD). An
example for the Channels… menu (with the RS232 option is fitted) is shown below –
ChB ITS90

Pb32
1 Send to PC
2 Send to RS232
3 Send to USB mem
12:02:03
Esc


PgDn
1
2
3
4
5
6
7
8
9
0

The report can be sent to the PC (standard USB port), the RS232 port the USB memory stick (or
any other attached interface). Select one of these destinations to send the report to.
Typical examples of all reports are shown in appendix 7.
84
ASL operating instructions, model CTR5000
CTR5000 Operating Instructions
The Channel… report has to gather information about any Smart probes plugged in and takes a few
seconds to this35. A Channel survey message is displayed whilst it collects information.
The data are sent to the specified data port. This can take several seconds for a full Probe report.
A progress bar is shown on the bottom line of the LCD while all the data are transmitted, for example
–
ChA ITS90
Smart
12:02:03
Esc
Send
dat a
3 Send
toprobe
comms

35
1
2
3
4
5
6
7
8
9
0

The exact time depends on the number of channels the CTR5000 has.
ASL operating instructions, model CTR5000
85
CTR5000 Operating Instructions
4.7.4 Options menu
From the measurement screen, select Menu  7 Options…  
The Options menu is shown below –
ChA ITS90

1
2
3
4
5
Pb09
12:02:03
Security…
Buzzer enab..
Key buz enab…
Standby enab…
Data separator…
Esc



1
2
3
4
5
6
7
8
9
0

PgDn
6 Date format…
7 CTR5000/F250
mode…
8
Rs/t display...
CTR5000/F250 mode…
The Options menu is used to set various instrumental options. Once set, the menu will rarely
be referred to. The options are described below –
Utilities item
Description
Notes
1 Security…
Selects security mode menu
Report available channels
2 Buzzer enab…
Buzzer on or off menu
Default on
3 Key buz enab…
Key buzzer on or off menu
Default on
4 Standby enab…
LCD backlight standby menu
Default on
5 Data separator…
Data separator menu
Data separator (comma default)
6 Date format…
Date format menu dd/mm/yy
or mm/dd/yy
Date format (default dd/mm/yy)
7 CTR5000/F250
mode…
Data collection interval
0.5 s (default) or 3.0 s
8 Rs/t display…
Display the reference resistor
or the current time
Default is time (top right of LCD)
The Options menus are described in more detail in the following sections.
86
ASL operating instructions, model CTR5000
CTR5000 Operating Instructions
4.7.4.1 Security
The menus and operation of the instrument may be limited by setting security modes. For
example any security mode (apart from Security Off) will not allow CTR5000 re-calibration).
Higher security modes can be used to restrict access to various menus.
Select Security… and the display will show –
ChA ITS90
Smart
12:02:03
Esc
Secureto
code
= 0000
3 Send
comms


1
2
3
4
5
6
7
8
9
0

Enter code
Enter the required security code –
Security mode
Security code
Off
4300
Low
4301
Medium
4302
High
4303
The three security modes are36 –
36
A Secured menu message may be displayed if an attempt is made to use a secured menu.
ASL operating instructions, model CTR5000
87
CTR5000 Operating Instructions
Off
All menus and options are available
Low
All menus and options are available, except for the Calibration menu.
Smart probes may be disabled or data may be viewed (but not
changed).
Medium
As Low security; only the following menus are available –
1 Logging
2 Utilities
3 Options (security menu only)
4 Contrast
The channel menus, Zero, Hold and Units options are not available. The
bottom line of the LCD will display –
Menus s ecur ed ( Med)
High

As Medium security; only the following menus are available –
1 Utilities
2 Options (security menu only)
3 Contrast
The channel menus, Zero, Hold and Units options are not available. The
bottom line of the LCD will display –
Menus s ecur ed ( High) 
88
ASL operating instructions, model CTR5000
CTR5000 Operating Instructions
4.7.4.2 Buzzer enab…
The buzzer can be turned on or off. Selecting this will show the select menu –
ChB ITS90

Pb32
1 On ()
2 Off
12:02:03
Esc


PgDn
1
2
3
4
5
6
7
8
9
0

The () marker indicates that this is the current state of the buzzer option.
Select the required state then use the enter key ( ) to accept this or the Esc key to leave the
current state unchanged.
4.7.4.3 Key buz enab…
The key buzzer (buzz on key press) can be turned on or off. This menu is very similar to the
Buzz enab… (see above).
4.7.4.4 Standby enab…
The CTR5000 can be enabled to enter standby mode as a power-saving feature. When
enabled, the instrument will turn the LCD backlight off after 30 minutes after the last key
press37 (the LED will still be active). The instrument will still measure (and transmit) data, but the
LCD backlight intensity is turned off to save power. Once the CTR5000 is in standby mode, any
key-press will turn on the LCB backlight back on38.
This menu is very similar to the Buzz enab… (see above).
37
Or when receiving data from a comms link.
38
Data communications will not be affected by standby mode.
ASL operating instructions, model CTR5000
89
CTR5000 Operating Instructions
4.7.4.5 Data separator
This menu selects the separator to be used between data elements when data are sent to a
comms port. –
ChB ITS90

Pb32
12:02:03
1 Comma seprtn ()
2 Tab seprtn
Esc


1
2
3
4
5
6
7
8
9
0

PgDn
Select the separator then use the enter key ( ) to accept this or the Esc key to leave the
current separator unchanged.
4.7.4.6 Date format
The CTR5000 can display dates in the default format dd/mm/yy, or the alternative format
mm/dd/yy. Selecting this menu will display –
ChB ITS90

Pb32
1 dd/mm/yy ()
2 mm/dd/yy
12:02:03
Esc


PgDn
1
2
3
4
5
6
7
8
9
0

Select the date format and then use the enter key ( ) to accept this or the Esc key to leave
the current format unchanged.
90
ASL operating instructions, model CTR5000
CTR5000 Operating Instructions
4.7.4.7 CTR5000/F250 mode…
By default, the instrument is set to collect data every 0.5 s; this may be changed to an interval
of every 3 s (F250 default mode)39 using this menu –
ChB ITS90

Pb32
12:02:03
1 CTR5000 – 0.5s ()
2 F250 – 3.0 s
Esc


1
2
3
4
5
6
7
8
9
0

PgDn
Select the required mode then use the enter key ( ) to accept this or the Esc key to leave
the current mode unchanged.
4.7.4.8 Rs/t display…
This menu selects the information displayed on the top of the display –
ChB ITS90

Pb32
12:02:03
1 Rs display
2 Time display ()
Esc


PgDn
1
2
3
4
5
6
7
8
9
0

Select the required option and then use the enter key ( ) to accept this or the Esc key to
leave the current display unchanged.
39
The six data points are averaged. Because of the superior noise performance of the CTR5000, this is unlikely to give any real
advantage, but might be useful in a noisy environment or when long cables are used.
ASL operating instructions, model CTR5000
91
CTR5000 Operating Instructions
4.7.5 Comms menu
From the measurement screen, select Menu  8 Comms…  
The () marker indicates that this is the currently set option. The Comms menu is shown below
–
ChA ITS90

1
2
3
4
Pb09
Talk on
Talk off ()
View status
RS232 options…

12:02:03
Esc

1
2
3
4
5
6
7
8
9
0

PgDn
The exact appearance of this menu will depend on which comms options are fitted.
4.7.5.1 Talk on and Talk off
The CTR5000 can be set to transmit the result every time a new one is available (Talk on). Set
the talk status as required.
Note
Talk on will changed to Talk off if the data comms interface
detects any activity.
4.7.5.2 View status
The comms status will be displayed on the screen when this menu item is selected.
92
ASL operating instructions, model CTR5000
CTR5000 Operating Instructions
4.7.5.3 RS232 and IEEE options
This menu may or may not be present. The exact wording will depend on which (if any)
comms options are fitted. There are no USB or LAN options.
1
RS232 options…
The CTR5000 default settings are the same as the F250’s –
ChA ITS90

1
2
3
4
5
Pb09
12:02:03
Reset defaults
Baud rate (19200)
CTS/RTS (Off)
Data length
Stop bit
Esc



1
2
3
4
5
6
7
8
9
0

PgDn
Current settings
6 Parity
The RS232 options… menu is used to set various RS232 parameters. Once set, the menu will
rarely be referred to. The options are described below –
RS232 options
Description
Notes
1 Reset defaults
Resets CTR5000 defaults
Immediately resets to F250 defaults
2 Baud rate (19200)
Select baud rate
1200, 2400, 4800, 9600 or 19200 (default)
3 CTS/RTS (On)
Handshaking on or off
Toggles On (default) or Off
4 Data length
Data length
7 bits or 8 bits (default)
5 Stop bit
Number of stop bits
1 bit or 2 bits (default)
6 Parity
Parity
None (default), Odd or Even
Each RS232 option has its own menu.
ASL operating instructions, model CTR5000
93
CTR5000 Operating Instructions
2
IEEE options...
The default IEEE address (IEEE = 3) may be changed by selecting this menu –
ChA ITS90
Smart
12:02:03
Esc
= 03
3 SendIEEE
to comms


Ad d r e s s ?
1
2
3
4
5
6
7
8
9
0

Use the editor to set the address and then the enter key ( ) to accept the value (or the Esc
key to leave the address unchanged).
The default setting is 3. Any address in the range 0 to 31 may be used.
94
ASL operating instructions, model CTR5000
CTR5000 Operating Instructions
4.7.5.4 Time and date
From the measurement screen, select Menu  9 Time/Date…  
This menu sets the current time or date for the real-time clock40. The screen will show –
ChB ITS90

Pb32
12:02:03
1 Set time
2 Set date
Esc


1
2
3
4
5
6
7
8
9
0

Help
Select the required menu format and use the enter key ( ) to select this or the Esc key to
return. Selecting 1 Set time will show –
ChA ITS90
Smart
12:02:03
Esc
T imeto=comms
12: 02: 00
3 Send


1
2
3
4
5
6
7
8
9
0

Set time
Use the editor to set the time (the colon symbols will be skipped) and then use the enter key
( ) to accept the value (or the Esc key to leave the time unchanged).
Date entry is similar.
40
The real-time clock uses a small, replaceable, internal lithium battery that will last for many years.
ASL operating instructions, model CTR5000
95
CTR5000 Operating Instructions
4.7.5.5 Contrast
From the measurement screen, select Menu  10 Contrast  
The screen will change to show the LCD contrast adjustment screen –
ChA ITS90
Smart
12:02:03
(60)
Esc




1
2
3
4
5
6
7
8
9
0

Contrast


Use the two  and  soft-keys to adjust the LCD contrast to the desired level before returning
to measurement mode by pressing the enter key (or  ), or press the Esc key to exit without
changing the current setting. Alternatively, type the required value on the numeric keypad.
Note
The screen will automatically revert to Measurement mode if no
changes are made within 60 seconds.
96
ASL operating instructions, model CTR5000
CTR5000 Operating Instructions
4.7.5.6 Diagnostics
Several diagnostics are available for the CTR5000. Their use is specialised. Access is restricted
and various passwords are required to use them.
ASL operating instructions, model CTR5000
97
CTR5000 Operating Instructions
5. Data Pairs
5.1 Introduction
The CTR5000 measures a resistance value by comparing the probe’s resistance to a known
calibrated resistor inside the instrument. Mathematical equations are used to convert this
resistance measurement to a temperature (commonly to the DIN90, CvD or ITS-90 standards).
The equations use (polynomial) coefficients to convert from resistance to temperature. The
more accurately the coefficients reflect the probe characteristics over a range of
temperatures, the more accurate the temperature conversion will be.
The CTR5000 can provide (calculate) the coefficients from measurements of resistance at
accurately known temperatures. These measurements are called data pairs – consisting of
one resistance measurement and its corresponding temperature measurement.
One data pair is not sufficient to calculate all the coefficients. The number of pairs required
depends on the temperature conversion method and also the range that the temperature
conversion is to cover – for example four data pairs are required for CvD conversion method.
5.2 Procedure
Pairs of measurements are required. The probe must be placed in a stable, temperature
controlled environment during the measurement. The CTR5000 will provide the probe’s
resistance at the stable temperature - and also the temperature if a calibrated probe is used
to measure the stable environment.
The CTR5000 menus will help with the measurement. The procedure, in order, is –
1
Place the probe to be calibrated in a stable temperature-controlled environment
2
Measure the environment’s temperature with the calibrated probe connected to
channel B and the probe to be calibrated to channel A41
41
3
Allow the system to temperature-stabilise
4
Enter the resistance and the corresponding temperature
5
Repeat the procedure for all the pairs required
Other channels may be used, but for a single probe this can simplify data entry
98
ASL operating instructions, model CTR5000
CTR5000 Operating Instructions
6
Use the CTR5000 to calculate and transfer the coefficients to the probe
7
Confirm correct calculation by measuring the calibration temperature with the probe
8
Record or output the probe coefficients values
Generally, CvD data-pairs are entered for –

One negative temperature

A temperature at 0C

A temperature near 100 C

A temperature well above 100 C
More pairs are required for ITS-90 entry.
Note
It is not always necessary to enter all data-pairs. For example, it
is unnecessary to enter the negative pair values if negative
temperatures will not be measured.
The full procedure will be covered in detail in the following sections.
5.3 Data Pair menu
The data-pair menu is called by selecting this as the conversion method for the currently
selected probe. Once a probe has been selected, choose its conversion method as datapairs from the Conversion… menu –
ChA ITS90

1
2
3
4
5
Pb09
12:02:03
DIN90
CvD
ITS-90
Din (IEC751)
Data pairs…

Esc
1
2
3
4
5
6
7
8
9
0


Pb 16 ITS90
ASL operating instructions, model CTR5000
99
CTR5000 Operating Instructions
This will allow data-pair entry, calculation and transfer42. Display the Data pairs menu –
ChA ITS90

1
2
3
4
5
Pb09
12:02:03
Edit…
Calculate
CvD
CvD (A=R, B=T) 
Ag(0.01,961.78C)

6
7
8
9
10
11
12
Esc
1
2
3
4
5
6
7
8
9
0



3 DP
CvD
(A
Al(0.01,660.32C)
Zn(0.01,419.53C)
Sn(0.01,231.93C)
In(0.01,156.60C
Ga(0.01,29.765C)
HgGa(-38,29.7C)
Ar(-192.35,0C)
The menu items are described below –
5.3.1 Edit…
This menu is used to edit (or enter) the resistance and temperature data pairs. The exact form
of the Edit… menu will depend on the selected conversion method. The screen above shows
that CvD (A=R, B=T) (menu item 4) is the currently selected conversion method for data-pair
entry (the  symbol and bottom right of the LCD show this as the currently selected method).
The examples described will use the CvD (A=R, B=T) method; other conversion methods are
very similar. The CTR5000 will present only the correct menus for the selected conversion
method.
Selecting Edit… (for CvD) will show –
42
Once the pairs have been entered and calculated, they may be transferred to the currently selected probe’ s coefficients
for review.
100
ASL operating instructions, model CTR5000
CTR5000 Operating Instructions
ChA ITS90

1
2
3
4
5
R(-t1)
R(tp)
R(+t1)
R(+t2)
T(-t1)
Pb09
12:02:03
= 000.0000
= 000.0000
= 000.0000
= 000.0000
= -050.000

3
Esc
1
2
3
4
5
6
7
8
9
0



DP
CvD
6 T(tp) = -000.000
7 T(+t1) = +100.000
8 T(+t2) = +200.000
Selecting, for example, menu item2 will display the edit screen for the resistance part of the
data-pair43. Selecting item 1 (R(-t1) will display –
ChA ITS90
Smart
12:02:03
Esc
R( - t 1)
000.0000
3 Send
to =comms


80.0021 Ω
1
2
3
4
5
6
7
8
9
0

Resistance reading
from channel A
The resistance value for R(-t1) can be entered (or edited). Alternative, the resistance (read
from channel A) is shown above soft-key 3; pressing the key will enter this reading into the R(t1) value. Similarly, when editing temperature readings, the value above the soft-key will
shown the currently temperature reading from channel B.
43
Note that resistances are entered to 4 decimal places and temperatures to 3.
ASL operating instructions, model CTR5000
101
CTR5000 Operating Instructions
Presssing the soft_key will enter 80.002 into the edit field. Pressing the  key will return to the
previous screen and change the text on the top line to read
1 R( -t1) = 80.002.
Note
Soft-key 3 is only available for this for resistance readings on
other conversion methods. The value shown next to the key
then comes from the currently selected channel.
The value will only be displayed next to the key when valid.
5.3.2 Calculate…
This is used to calculate the coefficients (if possible) from the entered data. Selecting this will
calculate the coefficients and then display –
ChA ITS90
Pb09
12:02:03
Esc
Xf er
o coef f ?
3 Send
tot comms

Yes
1
2
3
4
5
6
7
8
9
0

No
Pressing the Yes soft-key will transfer the coefficients to the currently selected probe (Pb09 in
the example above). Pressing the No soft-key (or Esc key) will leave the coefficients
unchanged.
Note
The CTR5000 will show an error if it cannot use one or more of
the data-pair values
102
ASL operating instructions, model CTR5000
CTR5000 Operating Instructions
Once calculated and transferred, the coefficients can be reviewed as normal from the
Probes… menu. After transfer, these coefficients will be used for the probe.
Its temperature conversion can be checked by returning to measurement mode.
Note
Once calculated, there is no error checking on the coefficients.
Incorrectly entered data will result in incorrect coefficients.
5.3.3 CvD
Used for CvD data entry. Temperatures must be entered manually.
5.3.4 CvD (A=R, B= T)
Used for CvD data entry from channel A (resistance) and channel B (temperature).
5.3.5 Ag(0.01,961.78C) to 12 Ar(-192.35,0C)
Used for data entry for standard methods. Temperatures must be entered manually. Select the
menu that covers the range of interest.
ASL operating instructions, model CTR5000
103
CTR5000 Operating Instructions
6. Instrument Measurement Range
6.1 Instrument measurement working range
The instrument can detect the following conditions Open Circuit Probe, Over Range
measurement and Under Range measurement. These conditions are shown on the display as
–
Condition
Display
Open probe
Over range
R> Rmax
Over temperature
T> Tmax
Under temperature
T <Tmin
6.2 Measurement ranges
Measurement units PRT
Conversion
Under range
Over range
Units
Resistance
None
-
500
ohms
Din90
-201
+851
C (F, K)
CvD
-201
+850
C (F, K)
ITS90
-201
+962
C (F, K)
Temperature
104
ASL operating instructions, model CTR5000
CTR5000 Operating Instructions
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ASL operating instructions, model CTR5000
105
CTR5000 Operating Instructions
7. Calibrating the CTR5000
7.1 CTR5000 reference calibration
The CTR5000 bridge measurement technique used is inherently very stable and linear.
However a small drift of the internal reference resistor may occur with time, making periodic
re-calibration advisable.
Check calibration daily before and after use with known, regularly-calibrated, reference
resistors.
7.2 Equipment
Temperature controlled environment at +20°C ±2°C.
Stable, calibrated (1ppm) resistors (0Ω, 25 Ω and 100 Ω).
7.3 Calibration procedure
See the section on calibration for the full procedure.
7.4 Full instrument calibration procedure
Special equipment is required for this. Refer to the supplier or agent for details.
106
ASL operating instructions, model CTR5000
CTR5000 Operating Instructions
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107
CTR5000 Operating Instructions
8. Obtaining the best from the CTR5000 bridge
8.1 Procedure
Please observe the following to obtain the best results from your instrument –

Do ensure there are no draughts or forced air flow around the instrument (e.g. from an
air conditioning unit).

Allow at least 20 minutes for the instrument to fully stabilise, or longer if switching on
from cold.

Do keep the operating environment stable.

Do ensure the sensor leads and input connectors are free from dirt as leakage current
will affect the results.

In common with best practice, use a known stable, calibrated resistor to take a
measurement at the start and end of the day; log the results.

Do NOT locate the instrument near a source of vibration, heat, or draughts.

Do NOT locate the instrument near sources of electrical interference – e.g. electric
motors.
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ASL operating instructions, model CTR5000
CTR5000 Operating Instructions
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CTR5000 Operating Instructions
9. Communications - Interface and PC commands
9.1 Introduction
The CTR5000 is fitted with a USB communication interface as standard. The connected PC
must have the correct USB driver installed to use the interface (see section 9.2). Alternatively,
the CTR5000 may be fitted with an RS232 or LAN or IEEE interface.
The commands are buffered by the CTR5000 (saved in order of arrival) so more than one
command can be sent to the instrument without waiting for the previous one to complete.
However, to prevent unpredictable results, it is normally easier to wait for the expected
response before issuing the next one.
When an additional interface is fitted, it is possible to use both simultaneously. However,
unpredictable results may occur, depending on the exact timing and order of any input
commands.
9.2 Interfaces
The USB interface is fitted a standard. The (optional) IEEE or RS232 or LAN interfaces, while
using a completely different means of transporting data, work in the same way as far as the
command structure is concerned.
The specific difference between the data-transport methods are covered in the sections
below.
9.2.1 USB device driver
The USB PC interface will normally be installed as a virtual COM port driver (simulated serial
port).
An interval of 1ms to 2 ms should be allowed between transmitted characters.
The communication protocol is –
110
Bits per second
19200
Data bits
8
Stop bits
2
Parity
none
Flow control
none
ASL operating instructions, model CTR5000
CTR5000 Operating Instructions
Use the menu system on the CD to load the device driver; alternatively, run the program
CDM_Setup.exe from the directory D:\USB Drivers\ on the CD supplied with the instrument44.
This will install the USB drivers. You will see the following message once this is complete.
When writing a control program for the instrument, it may be easier to use the API commands
provided by FTDI™. See their web-site for more details –
http://www.ftdichip.com/
9.2.2 IEEE-488.2 interface (optional)
The IEEE-488.2 interface45 requires the instrument’s bus address to correspond to the address
used by the controller (normally a PC).
The IEEE interface uses an 8-bit data bus and software protocol to transfer data in parallel.
Each instrument connected to the bus must have a unique address. This address may be
changed at any time using the Comms menu. The CTR5000 slave bus address has a default
address of 3.
The software driver for the IEEE interface will be supplied by the PC interface card’s vendor. A
popular text based console program is supplied by National Instruments™ and an example
of the use of this is shown below –
Win32 Interactive Control
Copyright 1996 National Instruments Corporation
All rights reserved.
44
Replace the ‘D’ with the name of your CD device as necessary
45
Also known as a GPIB interface
ASL operating instructions, model CTR5000
111
CTR5000 Operating Instructions
Type 'help' for help or 'q' to quit.
: ibdev
enter board index: 0
enter primary address: 3
<<= Default for CTR5000!!!
enter secondary address: 0
enter timeout: 13
enter 'EOI on last byte' flag: 1
enter end-of-string mode/byte: 10
ud0: ibwrt “Q_”
<<= <CR> required i.e. \x0D
[0900] ( rqs cmpl )
<<= rqs also
count: 11
ud0: ibrd
enter byte count: 6
<<= line added unless you specify the
<<= number of byte top read it requests
[0900] ( rqs cmpl )
<<= Actual flags
count: 6
30 33 2c 30 31 0d
03,01.
<<= <CR> appears as a dot & is 0D hex
<<= plus ascii in lower case
Note
When the IEEE address is changed (via the Comms Options menu), the
instrument must be switched off and on to reset and use the new
address.
The more recent version of the National Instrument interface GPIB configuration for the PC interface
card is shown below –
112
ASL operating instructions, model CTR5000
CTR5000 Operating Instructions
The device EOS settings for the ASL IEEE Interfaces are –
Using the NI Communicator and the Instrument PC Command set (below), enter the required
command parameters into the ‘send string’ box and select ‘write’.
Select ‘query’ for a command that returns data from the CTR5000 –
ASL operating instructions, model CTR5000
113
CTR5000 Operating Instructions
The following error may be seen in NI communicator if ‘write’ and then ‘read’ is used
Iberr = EABO
EABO indicates that an I/O operation has been cancelled - usually due to a timeout condition after a
GPIB read. Before reading from the instrument, verify that the GPIB commands you send are
understood by your interface and that it instructs it to place data in its output buffer. For information
on your interface’s command syntax, consult the instrument manufacturer's user documentation.
114
ASL operating instructions, model CTR5000
CTR5000 Operating Instructions
9.2.3 RS232 interface (optional)
The RS232 interface uses a standard data lead to connect to a PC. The connections are the same as
those used for the F250. The default parameters are –
19200 baud, 8 bits, hardware handshaking, 2 stop bits and no parity
Connections are –
Computer
Instrument
9-pin connector
Function
9-pin connector
2
Rx
2
3
Tx
3
4
DTR
4
5
GND
5
6
DSR
6
7
RTS
7
8
CTS
8
The instrument has a male gender connector. The number of wires required for the
connection will depend on the exact RS232 settings.
Baud rate and other parameters are selectable (via the Comms… menu).
ASL operating instructions, model CTR5000
115
CTR5000 Operating Instructions
9.2.4 LAN interface (optional)
The LAN symbol  will be permanently displayed when this interface is connected. There
are no LAN options.
116
ASL operating instructions, model CTR5000
CTR5000 Operating Instructions
9.3 Instrument PC commands
The following sections cover use of the remote PC commands. These may be sent to the
instrument via a simple terminal program46, through some programming interface, from
Excel™ (or similar program) or interactively with a dedicated program (such as ULOG –
supplied by ASL). The PC symbol (  )will be displayed briefly when communicating
(depends on timings).
9.3.1 Remote mode (local lockout)
The instrument may be set into Remote mode to prevent problems with simultaneous control
from a PC and from someone using the front panel keys. In Remote mode, the instrument can
only be controlled over the interface since the CTR5000’s front panel keys are locked out. To
enable Remote mode, the instrument must be sent a Remote mode command (see section
9.4.1).
It is not necessary to be in remote mode to use any of the PC commands, but care must be
taken not to inadvertently change settings.
9.3.2 Programming command syntax
The programming command language is based on the SCPI command format. Commands
consist of one or more command strings containing some or all of the following –
Colon ‘:’
Separates command words
Question mark ‘?’
Command requiring a response
Space ‘ ‘
Separates the command word from the first parameter
(shown as <space> in the examples)
Comma ‘,’
Separates the parameters list
Parameter47 <parameter list>
Parameters list separated by commas
46
A number of these are available free on the Web.
47
The ‘<’ and ‘>’ symbols in the text are used to help with clarity; they do not form part of the command
sequence.
ASL operating instructions, model CTR5000
117
CTR5000 Operating Instructions
Terminator <cr> or <cr><lf>
Terminates the line and the command
For example, the units may be set by sending the string –
UNIT:TEMP CEL<cr><lf>
i.e. <command><:><command><space><parameter><,><parameter><terminator(s)>
It is important to remember the space between the end of TEMP and CEL.
Additional or extra arguments after a valid command will be ignored.
9.3.3 Case sensitivity
Command words are not case sensitive; you can use upper or lower case characters or any
combination. For example, the following are all valid –
SYSTEM:REMOTE
system:remote
SyStEm:rEmOtE
9.3.4 Long form short form commands
Command words can have a long form and short form. The short form version is indicated by
upper case characters in subsequent sections. Either form may be used. The following are
identical –
SYSTem:REMote
(long form)
SYST:REM
(short form)
9.3.5 Command terminators <cr> or <cr><lf>
All commands sent to the instrument must be terminated with a carriage return <cr>
character. The terminating character pair <cr><lf> may be used, since the <lf> character is
ignored.
118
ASL operating instructions, model CTR5000
CTR5000 Operating Instructions
9.3.6 Error responses
A list of error responses follows the command descriptions. Twp common error responses are The E4 error (unrecognised command) will be sent in response to all incorrect commands.
The E5 error (unrecognised parameter/argument) will be sent in response to all incorrect
commands with an incorrect parameter.
9.3.7 CTR5000 0.005 K and CTR5000 0.01 K commands
The CTR5000 0.01 K commands are also included in an Appendix. These commands can be
mixed with the CTR5000 0.005 K commands48.. However care should be taken to ensure
correct operation.
Commands are very similar to those used by the F200/F201, but have been simplified in a few
instances.
9.3.8 Starting with PC commands
Experiment with the *IDN? command when first starting and do not use the SYSTEM:REMOTE
command until you are happy with the instrument’s operation49.
Use each of the commands in turn to confirm that they produce the response you expect
from them.
48
All CTR5000 0.01 K commands are available to the CTR5000 except for the ‘C’ command.
49
The SYSTEM:REMOTE command is cancelled once the instrument’s power is switched off and on again.
ASL operating instructions, model CTR5000
119
CTR5000 Operating Instructions
9.4 Interface commands
All CTR5000 commands are described in detail in the follow sections. Each command
description follows a common layout.
9.4.1 *IDN?
Command
*IDN?
Returns
<manufacturer>,<model no>,<serial no>,<firmware version><date>
Parameters
<manufacture>
ASL
<model no>
CTR5000AC
<serial no>
Serial number of the instrument
<firmware version>
Current firmware version and date
Function
Reads the instrument’s identification code consisting of the
manufacturer name, instrument model number, instrument serial
number, firmware version and date
Example
*IDN?<cr><lf>
(command)
ASL,CTR5000,123456/003,V1.00,22/01/10<cr><lf>
(response)
9.4.2 SYSTem:REMOte
Command
SYST:REMO
SYSTEM:REMOTE
Returns
None (or ACK if set on)
Function
Places the instrument in remote mode for interface control
Displays ‘PC icon on the CTR5000. The PC symbol (  ) will be displayed
permanently when the CTR5000 is in remote mode.
Locks out the instrument’s front panel keys
Example
SYST:REM
9.4.3 SYSTem:LOCAl
Command
SYST:LOCA
SYSTEM:LOCAL
Returns
120
None (or ACK if set on)
ASL operating instructions, model CTR5000
CTR5000 Operating Instructions
Function
Returns the instrument to local mode
Enables the instrument’s front panel keys
Example
SYST:LOC
9.4.4 SYSTem:ACKNowledge <state>
Command
SYST:ACKN <state>
SYSTEM:ACKNOWLEDGE <state>
Parameters
0
Turn acknowledge response OFF
1
Turn acknowledge response ON
Returns
ACK
Function
Sets or clears the acknowledge command response. Commands that
do not have a response may use this command to force a positive
response by the CTR5000
Example
SYST:ACK 1
(Sets acknowledge response ON)
9.4.5 SYSTem:CALIbrated?
Command
SYST:CALI?
SYSTEM:CALIBRATED?
Returns
System calibrated status
Function
Returns the calibration status
Example
SYST:CALI?<cr><lf>
(command)
1<cr><lf>
(response)
(the system is calibrated)
9.4.6 SYSTem:DISPlay:RESOlution <argument>
Command
SYST:DISPL:RESO <argument>
SYSTEM:DISPLAY:RESOLUTION <argument>>
Returns
None (or ACK if enabled)
Parameters
<argument>
ASL operating instructions, model CTR5000
0 to 3
Number of decimal places
121
CTR5000 Operating Instructions
4
For resistance only
Function
Sets the number of decimal places used
Example
SYST:DISP:RESO<space>2<cr><lf>
(sets 2 decimal places)
9.4.7 SYSTem:DISPlay:RESOlution?
Command
SYST:DISPL:RESO?
SYSTEM:DISPLAY:RESOLUTION?
Returns
Current resolution
Parameters
See above
Function
Returns the number of decimal places used
Example
SYST:DISPLAY:RESO?<cr><lf>
(command)
2<cr><lf>
(response)
(returns the resolution as 2 decimal places)
9.4.8 SYSTem:DATE <date>
Command
SYST:DATE <date>
SYSTEM: DATE <date>
Returns
None (or ACK if set on)
Function
Sets the instrument’s date
Format
yy,mm,dd
Example
SYST:DATE <space>10,07,23<cr><lf>
(set instrument date to 23/07/10)
9.4.9 SYSTem:DATE?
Command
SYST:DATE?
SYSTEM: DATE?
122
Returns
Date
Function
Returns the instrument’s date
ASL operating instructions, model CTR5000
CTR5000 Operating Instructions
Example
SYST:DATE?<cr><lf>
(command)
10,07,23<cr><lf>
(response)
(instrument date is set to 23/07/10)
9.4.10 SYSTem:PASSword <password>,<enable>
Command
SYST: PASS <password><enable>
SYSTEM: PASSWORD <password><enable>
Returns
None (or ACK if set on)
Parameters
<password>
9900
System password
<enable>
0 enable
Enable flag
1 disable
Function
Enables or disables the password
Example
SYST: PASS <space>9900,0<cr><lf>
(disables the password check)
9.4.11 SYSTem:PASSword?
Command
SYST: PASS?
SYSTEM: PASSWORD?
Returns
System password status
Function
Returns the password status
Example
SYST: PASS?cr><lf>
(command)
1<cr><lf>
(response)
(the system password is disabled)
9.4.12 SYSTem:TIME <time>
Command
SYST: TIME <time>
SYSTEM: TIME <time>
Returns
None (or ACK if set on)
Function
Sets the instrument’s time
ASL operating instructions, model CTR5000
123
CTR5000 Operating Instructions
Format
hh,mm,ss
Example
SYST: TIME <space>9,14,23<cr><lf>
(set instrument time to 9:14:23)
9.4.13 SYSTem:TIME?
Command
SYST: TIME?
SYSTEM: TIME?
Returns
Time
Function
Returns the instrument’s time
Example
SYST: TIME?<cr><lf>
(command)
9,14,23<cr><lf>
(response)
(instrument time is to 9:14:23)
9.4.14 SYSTEM:ECHO: <argument>
Command
ECHO <argument>
Returns
None
Parameters
<argument>
Function
0
Turn echo OFF
1
Turn echo ON
Turns the echo command ON or OFF. Useful when debugging.
9.4.15 SYSTem:DISPLay:TIME <state>
Command
SYST:DISP:TIME <state>
SYSTEM:DISPLAY:TIME <state>
Parameters
0
Display the reference resistor
1
Display the time
Returns
None (or ACK if set on)
Function
Determines the top right-hand display setting
Example
SYST:DISP:TIME <space>0
(Sets the display to show the reference resistor)
124
ASL operating instructions, model CTR5000
CTR5000 Operating Instructions
9.4.16 SYSTem:BEEPer <note>,<length>
Command
SYST:BEEP <note><length>
SYSTEM:BEEPER <note><length>
Parameters
<note>
200 to 4000
Set pitch
<length>
0 to 3000
Set time in ms
Returns
None (or ACK if set on)
Function
Sound a note. Setting a time of 0 will disable the beeper. The CTR5000
will continue operation while the note sounds.
Example
SYST: BEEP: <space>2000,1000
(Sounds note for 1 second; pitch 2000)
9.4.17 SYSTem:MESSage <message>
Command
SYST:MESS <message>
SYSTEM:MESSAGE <message.
Returns
None
Parameters
<message>
Function
Displays the message and waits for a key press
Text (maximum of 18 characters)
9.4.18 SYSTem:SNUMber?
Command
SYST: SNUM?
SYSTEM: SNUMBER?
Function
Returns the instrument’s serial number (10 characters)
Example
SYST: SNUM?<cr><lf>
(command)
123456/123cr><lf>
(response)
(instrument’s serial number is 123456/123)
9.4.19 SYSTem:PCB?
Command
SYST: PCB?
SYSTEM: PCB?
ASL operating instructions, model CTR5000
125
CTR5000 Operating Instructions
Function
Returns the PCB serial number (10 characters)
Example
SYST: PCB?<cr><lf>
(command)
789012/123cr><lf>
(response)
(instrument’s PCB serial number is 789012/123)
126
ASL operating instructions, model CTR5000
CTR5000 Operating Instructions
9.4.20 MEASure:CURRent?
Command
MEAS:CURR?
MEASURE:CURRENT?
Returns
Last reading on currently selected channel with units
Function
Returns the last reading on currently selected channel
Example
MEAS: CURR?<cr><lf>
(command)
30.431,K<cr><lf>
(response)
(returns with 30.431K as the latest reading on the current channel)
ASL operating instructions, model CTR5000
127
CTR5000 Operating Instructions
9.4.21 CONFigure:CHANnel <channel>
Command
CONF:CHAN <channel>
CONFIGURE:CHANNEL <channel>
Returns
None (or ACK if set on)
Function
Sets the instrument to the channel specified
Example
CONF:CHAN<space>03<cr><lf>
(makes channel 03 (C) the currently active channel)
9.4.22 CONFigure:CHANnel?
Command
CONF:CHAN?
CONFIGURE:CHANNEL?
Returns
Currently selected channel
Function
Returns the currently selected channel
Example
CONF:CHAN?<cr><lf>
(command)
03<cr><lf>
(response)
(returns with the active channel of 03)
9.4.23 CONFigure:CHANnel:FITTed? <channel>
Command
CONF:CHAN:FITT? <channel>
CONFIGURE:CHANNEL:FITTED? <channel>
Returns
0 = Not fitted
1 = Fitted
Function
Returns the channel fitted status
Example
CONF:CHAN:FITT?<space>,3<cr><lf> (command)
0<cr><lf>
(response)
(channel 3 is not fitted)
128
ASL operating instructions, model CTR5000
CTR5000 Operating Instructions
9.4.24 CONFigure:SERIal?
Command
CONF:SERI?
CONFIGURE: SERIAL?
Returns
0 = Not fitted
1 = Fitted
Function
Returns the RS232 fitted status
Example
CONF: SERI <cr><lf>
(command)
0<cr><lf>
(response)
(RS232 interface is not fitted)
9.4.25 CONFigure:IEEE?
Command
CONF:IEEE?
CONFIGURE: IEEE?
Returns
0 = Not fitted
1 = Fitted
Function
Returns the IEEE fitted status
Example
CONF: IEEE <cr><lf>
(command)
0<cr><lf>
(response)
(IEEE interface is not fitted)
9.4.26 CONFigure:LAN?
Command
CONF:LAN?
CONFIGURE: LAN?
Returns
0 = Not fitted
1 = Fitted
Function
Returns the LAN fitted status
Example
CONF: LAN <cr><lf>
ASL operating instructions, model CTR5000
(command)
129
CTR5000 Operating Instructions
0<cr><lf>
(response)
(LAN interface is not fitted)
9.4.27 CONFigure:REFErence <argument>
Command
CONF:REFE <argument>
CONFIGURE:REFERENCE <argument>
Returns
None (or ACK if set on)
Parameters
<argument>
1
Automatic selection
2
25 ohm reference
3
100 ohm reference
Function
Sets the current channel to use this reference
Example
CONF:REF<space>2<cr><lf>
(sets current channel to use 25 ohms reference)
9.4.28 CONFigure:REFErence?
Command
CONF:REFE?
CONFIGURE:REFERENCE?
Returns
Reference used on current channel
Function
Returns the current reference resistor and channel
Example
CONF:REFE?<cr><lf>
(command)
2,1<cr><lf>
(response)
(25 ohms reference is in use on channel 1 (A))
9.4.29 CONFigure:CHANnel:SMARt?
Command
CONF:CHAN:SMAR?
CONFIGURE:CHANNEL:SMART?
Returns
0 = No Smart Probe
1 = Smart Probe
Function
130
Returns the Smart Probe status for the current channel
ASL operating instructions, model CTR5000
CTR5000 Operating Instructions
Example
CONF:CHAN:SMAR?<cr><lf>
(command)
1<cr><lf>
(response)
(a Smart Probe is attached to the current channel)
ASL operating instructions, model CTR5000
131
CTR5000 Operating Instructions
9.4.30 PROBe:ASSIgn <probe>,<channel>
Command
PROB: ASSI <probe>,<channel>
PROBE: ASSIGN <probe>,<channel>
Returns
None (or ACK if set on)
Parameters
<probe>
1 to 72 Probe number
<channel>
1 to 80 Channel number
Function
Assigns the probe to the specified channel. To un-assign a probe,
assign it to channel 0.
Example
CONF: ASSI <space>2,1<cr><lf>
(assign probe 2 to channel 1)
9.4.31 PROBe:ASSIgn? <probe>
Command
PROB:ASSI? <probe>
PROBE:ASSIGN? <probe>
Returns
Probe assignment status
Parameters
<probe>
Function
Returns the probe assignment status for the specified channel. Returns 0
if the probe is unassigned.
Example
PROB:ASSI? 5<cr><lf>
(command)
2<cr><lf>
(response)
1 to 72
Probe number
(Probe 5 is assigned to channel 2)
Errors
E9
Probe does not exist
9.4.32 PROBe:IDENtifier <probe>,<type>
Command
PROB: IDEN <probe>,<identification>
PROBE: IDENTIFIER <probe>,<identification>
132
Returns
None (or ACK if set on)
Parameters
<probe>
1 to 72 Probe number
ASL operating instructions, model CTR5000
CTR5000 Operating Instructions
<type>
0 to 10 long string. Identifiers less than 10 characters will
be padded with trailing spaces
Function
Sets the probe identifier to the specified string
Example
PROB: IDEN <space>2,abcDEFG1<cr><lf>
(sets probe 2 identifier to abcDEFG1)
9.4.33 PROBe: IDENtifier? <probe>
Command
PROB: IDEN? <probe>
PROBE: IDENTIFIER? <probe>
Returns
Probe Identifier string
Parameters
<probe>
Function
Returns the probe Identifier string
Example
PROB: IDEN? 5<cr><lf>
1 to 72
Probe number
(command)
abbbb12343<cr><lf>
(response)
(Probe 5 is identifier is abbbb12343)
9.4.34 PROBe:TMAX <probe>,<temperature>
Command
PROB: TMAX <probe<temperature>
PROBE: TMAX <probe>,<temperature>
Returns
None (or ACK if set on)
Parameters
<probe>
1 to 72 Probe number
<temperature>
valid floating point temperature (C)
Function
Sets the probe Tmax to the specified temperature in degrees Celsius.
The temperature must be a value between -201.0 C and 961.78 C.
Example
PROB: TMAX <space>2,501.5<cr><lf>
(sets probe 5 Tmax to 501.5 C)
9.4.35 PROBe: TMAX? <probe>
Command
PROB: TMAX? <probe>
PROBE: TMAX? <probe>
ASL operating instructions, model CTR5000
133
CTR5000 Operating Instructions
Returns
Probe Identifier string
Parameters
<temperature> 1 to 72
Function
Returns the probe Tmax setting in degrees C
Example
PROB: TMAX? 5<cr><lf>
Probe number
501.5<cr><lf>
(command)
(response)
(Probe 5 is Tmax is set to 501.5 C)
9.4.36 PROBe: TMIN <probe>,<temperature>
Command
PROB: TMIN <probe<temperature>
PROBE: TMIN <probe>,<temperature>
Returns
None (or ACK if set on)
Parameters
<probe>
1 to 72 Probe number
<temperature>
valid floating point temperature (C)
Function
Sets the probe Tmin to the specified temperature in degrees Celsius.
The temperature must be a value between -201.0 C and 961.78 C.
Example
PROB: TMIN <space>2,-102.0<cr><lf>
(sets probe 2 Tmin to -102.0 C)
9.4.37 PROBe: TMIN? <probe>
Command
PROB: TMIN? <probe>
PROBE: TMIN? <probe>
Returns
Probe Identifier string
Parameters
<temperature> 1 to 72
Function
Returns the probe Tmin setting in degrees C
Example
PROB: TMIN? 5<cr><lf>
(command)
-102.0<cr><lf>
(response)
Probe number
(Probe 5 is Tmin is set to -102.0 C)
134
ASL operating instructions, model CTR5000
CTR5000 Operating Instructions
9.4.38 PROBe:STANdard <probe>,<type>
Command
PROB: STAN<probe>,<type>
PROBE: STANDARD<probe>,<type>
Returns
None (or ACK if set on)
Parameters
<probe>
1 to 72 Probe number
<type>
1 to 4
Probe type (see below)
Function
Sets the probe to the specified type
Example
PROB: STAN <space>2,1<cr><lf>
(sets probe 2 to DIN90)
Type
1
DIN90
2
CVD
3
ITS90
4
DIN
9.4.39 PROBe: STANdard? <probe>
Command
PROB: STAN? <probe>
PROBE: STANDARD? <probe>
Returns
Probe type
Parameters
<probe>
Function
Returns the probe type
Example
PROB: STAN? 5<cr><lf>
(command)
3<cr><lf>
(response)
1 to 72
Probe number
(Probe 5 is type ITS90)
9.4.40 PROBe:UNIT <probe>,<units>
Command
PROB: UNIT <probe>,<units>
PROBE: UNIT <probe>,<units>
Returns
None (or ACK if set on)
ASL operating instructions, model CTR5000
135
CTR5000 Operating Instructions
Parameters
<probe>
1 to 72 Probe number
<type>
1 to 5
Units (see below)
Function
Sets the probe to the specified type
Example
PROB: UNIT<space>2,5<cr><lf>
(sets probe 2 units to Kelvin)
Type
1
Instrument Units
2
Ohms
3
Celsius
4
Fahrenheit
5
Kelvin
9.4.41 PROBe: UNIT? <probe>
Command
PROB:UNIT? <probe>
PROBE: UNIT? <probe>
Returns
Probe units
Parameters
<probe>
Function
Returns the probe units (see above)
Example
PROB: UNIT? 3<cr><lf>
(command)
5<cr><lf>
(response)
1 to 72
Probe number
(Probe 3 is set to Kelvin)
9.4.42 PROBe:COEFficient <probe>,<identifier>,<value>
Command
PROB: COEF <probe>,<identifier><value>
PROBE: COEFFICIENT <probe>,<identifier>,<value>
Returns
None (or ACK if set on)
Parameters
<probe>
1 to 72 Probe number
<identifier>
1 to 8, or
R0, Ap, Bp, Cp, Dp, An, Bn, Wt (see next)
136
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CTR5000 Operating Instructions
<value>
Scientific notation, five decimal places eg 3.90830e-03
R0 as a decimal, four decimal places eg 100.1234
Function
Set the specified probe’s coefficient to the number supplied. Only valid
coefficients for the probe type can be set.
Example
PROB:COEF<space>3,2, +3.90730e-03<cr><lf>
(sets probe 3’s Ap coefficient to +3.90730x10-03)
Errors
E9
Probe does not exist
9.4.43 PROBe:COEFficient? <probe>,<identifier>
Command
PROB:COEF? <probe>,<identifier>
PROBE:COEFFICIENT? <probe>,<identifier>
Returns
Coefficient for specified probe and coefficient number
Parameters
<probe>
1 to 72 Probe number
<identifier>
1 to 8, or
R0, Ap, Bp, Cp, Dp, An, Bn, Wt
Function
Returns the probe coefficient for the specified probe. Only valid
coefficients for the probe type will be returned.
Example
PROB:COEF? 3, 2<cr><lf>
(command)
+3.90830e-03<cr><lf>
(response)
(Probe 3’s Ap coefficient is +3.90830x10-03)
Coefficient codes
1
2
3
4
5
6
7
8
R0
Ap
Bp
Cp
Dp
An
Bn
Wt
ASL operating instructions, model CTR5000
137
CTR5000 Operating Instructions
9.4.44 UNIT:TEMPerature <units>
Command
UNIT:TEMP <units>
UNIT:TEMPERATURE <units>
Returns
None
Parameters
<units>
1
Instrument Units
2
Ohms
3
Celsius
4
Fahrenheit
5
Kelvin
Function
Sets the active channel’s units
Example
UNIT:TEMP<space>CEL<cr><lf>
(sets the active channel’s units to Celsius)
9.4.45 UNIT:TEMPerature?
Command
UNIT:TEMP?
UNIT:TEMPERATURE?
Returns
<units><cr><lf>
Function
Returns the active channel measurement units (see above)s
Example
UNIT:TEMP?<cr><lf>
(command)
3<cr><lf>
(response)
(returns the active channel’s units as Celsius)
Note
To update a Smart probe, Smart probes must be
enabled, the probe must be unlocked and the system
password active.
138
ASL operating instructions, model CTR5000
CTR5000 Operating Instructions
9.4.46 SENSe:FRTD:CAL:DATE <year>,<month>,<day>50
Command
SENS:FRTD:CAL:DATE <year>,<month>,<day>
SENSE:FRTD:CALIBRATION:DATE <year>,<month>,<day>
Returns
None (or ACK if enabled)
Parameters
<year>
<month>
<day>
Protection
Password protected command.
Function
Enter the calibration date to the selected smart probe, save the old
calibration date in history. Clear the max and min recorded values
outside working range since last cal.
4 digit numerical string
01 to 12 for month
01 to 31 for day
9.4.47 SENSe:FRTD:CAL:DATE?
Command
SENS:FRTD:CAL:DATE?
SENSE:FRTD:CALIBRATION:DATE?
Return
Parameters
<year>,<month>,<day>
<year>
4 digit numerical string
<month>
01 to 12 for month
<day>
01 to 31 for day
Function
Query the calibration date for the selected smart probe.
9.4.48 SENSe:FRTD:CAL:NEXT <year>,<month>,<day>
Command
SENS:FRTD:CAL:NEXT <year>,<month>,<day>
SENSE:FRTD:CALIBRATION:NEXT <year>,<month>,<day>
Parameters
<year>
<month>
<day>
Returns
None (or ACK if enabled)
Protection
Password protected command.
Function
Enter the next calibration date to the selected smart probe.
4 digit numerical string
01 to 12 for month
01 to 31 for day
9.4.49 SENSe:FRTD:CAL:NEXT?
Command
50
SENS:FRTD:CAL:NEXT?
SENSE:FRTD:CALIBRATION:NEXT?
Use 2 digits for day and month when less than 10 - e.g. 06. Maximum year is 2099.
ASL operating instructions, model CTR5000
139
CTR5000 Operating Instructions
Return
<year>,<month>,<day>
-222
No smart probe detected
Parameters
<year>
<month>
<day>
Function
Query the next calibration date for the selected smart probe.
4 digit numerical string
01 to 12 for month
01 to 31 for day
9.4.50 SENSe:FRTD:CAL:SOURce <source>
Command SENS:FRTD:CAL:SOUR <source>
SENSE:FRTD:CALIBRATION:SOURCE <source>
Parameters
CTR5000)
<source>
17 byte maximum ASCII string (10 displayed on
Returns
None (or ACK if enabled)
Protection
Password protected command.
Function
Save the calibration source reference code to the selected smart
probe.
9.4.51 SENSe:FRTD:CAL:SOURce?>
Command
SENS:FRTD:CAL:SOUR?
SENSE:FRTD:CALIBRATION:SOURCE?
Return
Parameters
<source>
<source>
Protection
Password protected command.
Function
Query the calibration source reference code for the selected smart
probe.
17 byte maximum ASCII string.
9.4.52 SENSe:FRTD:STANdard <standard>
140
Command
SENS:FRTD:STAN <standard>
SENSE:FRTD:STANDARD <standard>
Parameters
<standard>
Returns
None (or ACK if enabled)
Protection
Password protected command.
Function
Set the selected temperature conversion method.
Smart probe input save to smart probe.
1
2
3
4
Din90 (EN60751)
CvD
ITS90
DIN
ASL operating instructions, model CTR5000
CTR5000 Operating Instructions
None smart probe input save to instrument internal channel
configuration.
This command does not work on passive probes.
9.4.53 SENSe:FRTD:STANdard?
Command
SENS:FRTD:STAN?
SENSE:FRTD:STANDARD?
Return
<standard>
Parameters
<standard>
Function
Query the selected temperature conversion method.
Smart probe input query the smart probe.
None smart probe input query the instrument internal channel
configuration.
1
2
3
4
Din90 (EN60751)
CvD
ITS90
DIN
9.4.54 SENSe:FRTD:REFErence <reference>
Command
SENS:FRTD:REFE <reference>
SENSE:FRTD:REFERENCE <reference>
Parameters
<reference>
Returns
None (or ACK if enabled)
Protection
Password protected command.
Function
Set the selected reference resistor.
Smart probe input save to smart probe.
This command does not work on passive probes.
3
5
25 ohms
100 ohms
9.4.55 SENSe:FRTD:REFErence?
Command
SENS:FRTD:REFE?
SENSE:FRTD:REFERENCE?
Return
Reference for Smart probe (current selected channel)
3
5
Function
25 ohms
100 ohms
Query the selected channel reference resistor.
9.4.56 SENSe:FRTD:COEFficient <coefficient>,<value>
Command
SENS:FRTD:COEF <coefficient>,<value>
SENSE:FRTD:COEFFICIENT <coefficient>,<value>
ASL operating instructions, model CTR5000
141
CTR5000 Operating Instructions
Parameters
<identifier>
1 to 8, or
R0, Ap, Bp, Cp, Dp, An, Bn, Wt or all
<value>
Scientific notation, five decimal places eg 3.90830e-03
R0 as a decimal, four decimal places eg 100.1234
Returns
None (or ACK if enabled)
Protection
Password protected command.
Function
Set the selected input channel specified coefficient value.
Smart probe input save to smart probe.
None smart probe input save to instrument internal channel
configuration.
9.4.57 SENSe:FRTD:COEFficient? <coefficient>
Command
SENS:FRTD:COEF? <coefficient>
SENSE:FRTD:COEFFICIENT? <coefficient>
Parameters
<identifier>
1 to 8, or
R0, Ap, Bp, Cp, Dp, An, Bn, Wt or all
Return
<value>
Scientific notation, five decimal places eg 3.90830e-03
R0 as a decimal to four decimal places eg 100.1234
Function
Query the selected input channel specified coefficient value.
Smart probe input query the smart probe.
None smart probe input query the instrument internal channel configuration.
9.4.58 SENSe:FRTD:IDENtification <identification>
Command
SENS:FRTD:IDEN <identification>
SENSE:FRTD:IDENTIFICATION <identification>
Parameters
<identification>
Returns
None (or ACK if enabled)
Protection
Password protected command.
Function
Enter the identification number to the selected smart probe.
19 byte maximum ASCII string
9.4.59 SENSe:FRTD:IDENtification?
142
Command
SENS:FRTD:IDEN?
SENSE:FRTD:IDENTIFICATION?
Return
Parameters
<identification>
<identification> 19 byte maximum ASCII string (10 displayed on CTR5000)
ASL operating instructions, model CTR5000
CTR5000 Operating Instructions
Function
Query the identification number for the selected smart probe.
9.4.60 SENSe:FRTD:RANGe <rmax>,<rmin>
Command
SENS:FRTD:RANG <rmax>,<rmin>
SENSE:FRTD:RANGE <rmax>,<rmin>
Parameters
<rmax>
<rmin>
Returns
None (or ACK if enabled)
Protection
Password protected command.
Function
Enter the working range of the selected smart probe.
0 to 500 ohm’s
0 to 500 ohm’s
9.4.61 SENSe:FRTD:RANGe?
Command
SENS:FRTD:RANG?
SENSE:FRTD:RANGE?
Return
<rmax>,<rmin>
<rmax>,<rmin>
smart probe working range
recorded value outside working range
since last cal
recorded value outside working range
ever
<rmax>,<rmin>
Parameters
<rmax>
<rmin>
0 to 500 ohms
0 to 500 ohms
Protection
Password protected command.
Function
Query the working range and working history of the smart probe.
9.4.62 SENSe:FRTD:LOCK <state>
Command
SENS:FRTD:LOCK <state>
SENSE:FRTD:LOCK <state>
Parameters
<state> 0
Smart probe data unlocked
1
Smart probe data locked
Returns
None (or ACK if enabled)
Protection
Password protected command.
Function
Set the smart probe data protection state, before any smart probe data
can be changed it must first be unlocked.
ASL operating instructions, model CTR5000
143
CTR5000 Operating Instructions
9.4.63 SENSe:FRTD:LOCK?
Command
SENS:FRTD:LOCK?
SENSE:FRTD:LOCK?
Return
<state>
Parameters
<state> 0
Smart probe data unlocked
1
Function
Smart probe data locked
Query the smart probe data protection lock state.
9.4.64 SENSe:FRTD:ENABle <parameter>
Command
SENS:FRTD:ENAB <parameter>
SENSE:FRTD:ENABLE <parameter>
Returns
None (or ACK if enabled)
Parameters
<parameter> 0
Set Smart Probes OFF
1
Set Smart Probes ON
Function
Sets the CTR5000 Smart Probe enable mode
Example
SENSE:FRTD:ENAB<space>0<cr><lf>
(sets Smart Probes OFF)
9.4.65 SENSe: FRTD:ENABle?
Command
SENS:FRTD:ENAB?
SENSE:FRTD:ENABLE?
Returns
<parameter><cr><lf>
Function
Returns the CTR5000 Smart Probe enable setting
Example
SENSE: FRTD:ENAB?<cr><lf>
(command)
0<cr><lf>
(response)
(Smart Probes disabled)
9.4.66 SENSe:ZERO <parameter>
Command
SENS:ZERO <parameter>
SENSE:ZERO <parameter>
144
ASL operating instructions, model CTR5000
CTR5000 Operating Instructions
Returns
None (or ACK if enabled)
Parameters
<parameter>
0
Set Zero mode OFF
1
Set Zero mode ON
Function
Sets the CTR5000 zero mode
Example
SENSE:ZERO<space>0<cr><lf>
(sets zero mode OFF)
9.4.67 SENSe:ZERO?
Command
SENS:ZERO?
SENSE:ZERO?
Returns
<parameter><cr><lf>
Function
Returns the CTR5000 zero mode setting
Example
SENSE:ZERO?<cr><lf>
(command)
0<cr><lf>
(response)
(Zero mode is OFF)
ASL operating instructions, model CTR5000
145
CTR5000 Operating Instructions
10. Error codes
Error codes can be generated by the instrument for a variety of reasons –
Error code
Meaning / Cause
E1
Balance error / No PRT, PRT open circuit / Ratio over range.
E2
Temperature over range
E3
Not used
E4
IEEE or RS232 error / Unrecognized instruction sent
E5
IEEE or RS232 error / Illegal argument sent
E6
RAM failure
E7
Not used
E8
Unable to track temperature change or change too large
E9
Invalid password
E10
Coefficient not available
E11
Probe already assigned to a channel
E12
Unable to communicate while logging
E13
Remote enable is OFF (communications disabled)
E14
Channel or probe not available
E15
Locked out
E203
Password protected
E222
No Smart probe detected
E223
Smart probe disabled
E224
Smart probe locked
When in remote mode, for F250 compatibility, the error codes are –
Error code
146
Meaning / Cause
E1
Balance error/no PRT, PRT open circuit/ratio over range
E2
Temperature over range
E4
Unrecognized instruction sent
E5
Illegal argument sent
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CTR5000 Operating Instructions
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147
CTR5000 Operating Instructions
11. Cleaning and Maintenance
11.1 Cleaning
Make sure the CTR5000 is disconnected from any leads and from the mains supply before
cleaning.
Clean the outside of the instrument with a soft, clean cloth, slightly dampened with mild
detergent. Do not allow water to enter the instrument.
Warning
Never use alcohol or thinners as these will damage the instrument.
Never use a hard or abrasive cloth or brush.
Always disconnect from the mains supply before cleaning.
Warning
Regularly inspect the mains cable and plug for damage.
11.2 Maintenance
Keep the instrument and its leads clean with occasional calibration checks. In particular the
connectors to input terminals should be kept clean to prevent leakage currents flowing.
Damaged cable and connectors are a common cause of poor and intermittent operation.
148
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CTR5000 Operating Instructions
12. Service and Warranty
CTR5000 instruments and accessories, (unless stated otherwise), are covered by a 12 month
warranty on parts and labour from the date of dispatch from ASL (provided the instrument has
not been damaged in use or tampered with). This warranty does not include costs incurred in
returning the equipment to the factory for repair.
12.1 Technical Support
For all technical support, repair, warranty and service inquiries please contact:
Technical Services
WIKA UK
4 Gatton Park Business Centre
Wells Place
Merstham, Redhill
RH1 3LG
ENGLAND
United Kingdom
Telephone:
Fax:
+44 (0) 1737 644 008
+44 (0) 1737 644 403
E-Mail:
service@aslltd.co.uk
Web:
www.wika.co.uk
ASL operating instructions, model CTR5000
149
CTR5000 Operating Instructions
13. Appendix 1 – Definitions and terminology
i.
0 °C = 273.15 K
ii.
1 mK (milli-Kelvin) = 0.001 C (one milli-degree Celsius)
iii.
1 milli-degree C = 0.001C = 1m C = 1mK = 1.8m F
iv.
1 milli-degree F = 0.001F = 1m F = 0.56mK = 0.56m C
v.
Alpha (or ) is the temperature coefficient, or temperature sensitivity, of the platinum
wire used in PRTs. In general, the higher the alpha value, the better the PRT
thermometer measurement reproducibility, stability and performance’
vi.
vii.
Abbreviations for platinum resistance thermometers include –
PRT
(Platinum Resistance Thermometer)
Pt100
(PRT with nominally 100  resistance at 0 C)
RTD
(Resistance Temperature Device)
System accuracy refers to the overall, combined accuracy of the CTR5000 and PRT in
use.
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CTR5000 Operating Instructions
14. Appendix 2 – Firmware update
14.1 Firmware updates
ASL may decide to provide firmware updates from time to time. These can be downloaded
from the ASL website www.aslltd.co.uk. The procedure for updating the CTR5000 is described
in detail below. A PC, downloader software51 and USB cable are required.
14.2 Firmware update disclaimer
It is entirely your choice whether you choose to apply these firmware updates to your
instrument. ASL, whilst taking the utmost care to thoroughly test both the firmware and the
update procedure, can not accept any responsibility for any problem or loss resulting from
the procedure.
14.3 Firmware update procedure
 Obtain a copy of the latest firmware from the ASL website www.aslltd.co.uk and copy the
file into the directory indicated by the instructions on the website.
 Run the program CDM_Setup.exe from the directory D:\Downloader (replace the ‘D’ with
the name of your CD device if necessary). This will install the USB drivers. You will see the
following message one this is complete.
 Install the downloader software on your PC by running the program INSTALL.EXE from the
directory D:\Downloader (replace the ‘D’ with the name of your CD device if necessary).
Follow the installation procedure instructions which require you to enter your name and
the name of your company52.
51
Provided on the CD with the instrument.
52
The same download program can be used to update F200 firmware.
ASL operating instructions, model CTR5000
151
CTR5000 Operating Instructions
 This will create a shortcut icon on the desktop called ASL Downloader. Click on the ASL
downloader icon to run the downloader program. Select the CTR5000 Instrument option
 Click on the Help button.
 Select the CTR5000 option and choose Select. This will display a form with specific
instructions for the download process.
 Read and follow the instructions provided to update the instrument’s firmware.
 The whole process will take about 15 minutes.
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CTR5000 Operating Instructions
15. Appendix 3 – Callendar van Dusen
15.1 Callendar van Dusen equation (CvD
Platinum Resistance Thermometers (PRTs) are one of the most linear temperature sensors that
we have. Even so, the relationship between resistance and temperature is not entirely linear
and so it is necessary for the conversion from resistance to temperature to allow for this.
The IEC751 standard provides an equation that can be used to convert resistance to
temperature taking into account the small non-linearities of the PRT –

Rt  Ro 1  At  Bt 2  C t  100t 3

Where ‘Rt‘ is the resistance at temperature ‘t’ and ’R0‘ is the resistance at 0C. The coefficients
A, B and C (C = 0, if t> 0 C ) are defined in IEC751 for standard PRTs. However, the
coefficients must be measured individually (by regression) for a particular PRT when greater
accuracy is required.
An alternative (and easier) method exists via the Callendar van Dusen (CvD) equation, based
on measurement of four accurately known temperatures. The CTR5000 allows these
coefficients to be entered for each probe used. The resistance to temperature conversion
calculation is then carried out automatically within the instrument. However, this does rely on
the user knowing the coefficients A, B and C accurately and entering these into the CTR5000.
It is worth noting that the coefficients vary between standards. Typical values (PRT dependent)
are –
Standard

A
B
C
DIN 43760
0.003850
3.9080 x 10-3
-5.8019 x 10-7
-4.2735 x 10-12
ASTM
0.003911
3.9692 x 10-3
-5.8495 x 10-7
-4.2325 x 10-12
ITS-90
0.003926
3.9848 x 10-3
-5.870 x 10-7
-4.0000 x 10-12
C= 0 if t> 0C
ASL operating instructions, model CTR5000
153
CTR5000 Operating Instructions
16. Appendix 4 - ITS-90
16.1 International Temperature Scale (ITS-90)
The purpose of this scale is to define procedures by which certain specified practical PRTs of
the required quality can be calibrated in such a way that the values of temperature
obtained from them can be precise and reproducible; at the same time matching the
corresponding thermodynamic values as closely as current technology permits. Since 1968
when the IPTS68 was adopted, there have been significant advances in the techniques
employed in establishing temperature standards and in the measurement of
thermodynamic temperature.
The ITS-90 scale has much improved continuity, precision and reproducibility compared
with IPTS68. The implementation of the ITS-90 scale according to its definition calls for
significant changes in equipment and procedure compared with IPTS68, but lower
uncertainties of calibration are achievable in all parts of the range. However, the
instruments and equipment needed to implement the ITS-90 scale in calibration laboratories
will be substantially the same. Particular features are –
ITS-90 specifies the use of the PRT up to the freezing point of silver, 961.78 C. The platinum
10% rhodium/platinum thermocouple is no longer specified for use in the scale, though it
and other noble metal thermocouples will continue to be used as secondary standards53.

New, more precise, fixed points have been introduced and mathematical
procedures for calculating resistance/temperature equivalents have been
revised so as to reduce the 'non-uniqueness' of the scale: that is, to reduce the
differences which occur between different, identically calibrated PRTs. In
particular, the calibration of a PRT can no longer be extrapolated beyond the
freezing point of zinc, 419.527 C, but requires a measurement at the freezing
point of aluminium, 660.323 C.

Alternative definitions are permitted in certain sub-ranges, so that the calibration
of a PRT can be terminated at almost any fixed point. This provision allows
primary calibrations to be carried out with suitable PRTs over reduced ranges, and
53
Note that each of these fixed points has an uncertainty associated with it.
154
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CTR5000 Operating Instructions
will be of special importance to metrology standards departments which need to
make precise measurements at ambient temperatures.

The part of the ITS-90 scale which may be measured by PRTs extends from 83.8058
K (-189.3442 C) to 961.78 C. The actual range of temperatures which may be
measured depends on the type and range of the PRT used.
The ITS-90 scale requires the entry of 6 constants into the CTR5000 before the instrument can
accurately convert resistance to temperature for a particular PRT.
The constants are conventionally called R0.01, Ap, Bp, Cp, Dp, An, Bn and W.
ASL operating instructions, model CTR5000
155
CTR5000 Operating Instructions
17. Appendix 5 - DIN standard
17.1 DIN 90 1980 (EN 60751)
The DIN90 standard uses defined values for the conversion of resistance to temperature
using the Callendar van Dusen equation. No data entry for the probe is required since the
coefficients are predefined. The DIN coefficients are defined as –
R0 = 100 ohms
A = 3.90823 x 10-3
B = -5.7750 x 10-7
C = -4.1830 x 10-12
The CTR5000 will provide accurate resistance to temperature conversion based on these
values when DIN90 conversion is selected for a probe.
17.2 DIN 43760 1980 (IEC 751)
The DIN standard uses defined values for the conversion of resistance to temperature using
the Callendar van Dusen equation. No data entry for the probe is required since the
coefficients are predefined. The DIN coefficients are defined as –
R0 = 100 ohms
A = 3.90802 x 10-3
B = -5.8020 x 10-7
C = -4.2735 x 10-12
The CTR5000 will provide accurate resistance to temperature conversion based on these
values when DIN68 conversion is selected for a probe.
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ASL operating instructions, model CTR5000
CTR5000 Operating Instructions
18. Appendix 6– AC Bridge operation
18.1 AC Bridge basics
The CTR5000 Bridge measures the voltage (Vt) developed across the unknown sensor
resistance (Rt) and the voltage (Vs) across a stable internal reference resistance (Rs). The
voltages are proportional to the resistances so the thermometer resistance is derived from –
Rt  Rs 
Vt
Vs
This technique achieves immunity from slow moving time and temperature drifts in the
electronics as it is not affected by voltage measurement gain variations or current source
fluctuations. In addition, the AC Bridge technique used achieves superior stability
performance (over DC Bridges) by eliminating all other sources of thermally generated EMF’s
(voltages) and sources of drift
The internal reference resistor must have a known (calibrated) value for an accurate
determination of the thermometer resistance Rt.
Although the principle of measuring the ratio of two resistors (see introduction) is identical
between AC and DC bridges, the bridges operate very differently in the way they perform this
ratio measurement.
DC bridges require very stable and accurate electronics to achieve their performance; AC
bridges do not require such high-stability. Since they are based on an AC measurement,
these bridges are also immune to all thermal problems associated with DC bridges.
ASL operating instructions, model CTR5000
157
CTR5000 Operating Instructions
The basic bridge arrangement is shown below –
Switches
Rt
AC constant
current source
Balancing circuit
Inductive
divider
Ratio
1.450
~
Rs
Phase difference detector
Display
The AC constant current source generates a sine-wave that supplies Rt and Rs in series - so
both resistors see identical currents.
The inductive divider consists of numerous turns of wires round transformer cores. The turns are
arranged so that they form a series of ratio dividers that can be individually switched in and
out by the balancing circuit.
The bridge works by balancing the inductive dividers (using the phase difference detector) so
that the ratio of currents in the two series resistors is precisely known and equal to their ratio.
Since the balance point depends only on the ratio of the transformer turns to the unknown
resistance, the measurement is precise and unaffected by drift.
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CTR5000 Operating Instructions
19. Appendix 7– Report examples
19.1 Channel report
CTR5000
Serial number,123/456789
Date,23/01/10,Time,13:22:31
*
Channel,01,Type,Internal,A
Conversion,ITS90
Probe Undefined,Smart s/no,ABCD
Tmax,+851.0,Tmin,-201.0
Units,ohms
Ref R,100
Channel,02,Type,Internal,B
Conversion,DIN90
Probe Undefined,Passive probe,DIN90
Tmax,+851.0,Tmin,-201.0
Units,None Set
Ref R,100
Channel,03,Type,Internal,C
Conversion,DIN90
Probe Undefined,Passive probe,DIN90
Tmax,+851.0,Tmin,-201.0
Units,None Set
Ref R,100
Channel,16,Type,S252,16,Serial number,123/456789
Conversion,DIN90
Probe Undefined,Passive probe,DIN90
Tmax,+851.0,Tmin,-201.0
Units,None Set
Ref R,100
.
.
Report continues to end of connected channels
ASL operating instructions, model CTR5000
159
CTR5000 Operating Instructions
19.2 Assigned probes report
CTR5000
Serial number,123/456789
Date,23/01/10,Time,13:34:10
*
Probe no,41
Probe id,
Conversion,DIN90
Assigned to channel,03,Tmax,323.1,Tmin,-200.1,
Units,None Set,R0=+100.0000,A=+3.90830x10-03,B=-5.77500x10-07,C=-4.18300x10-12,
All other probes are unassigned
160
ASL operating instructions, model CTR5000
CTR5000 Operating Instructions
19.3 All probes report
CTR5000
Serial number,123/456789
Date,23/01/10,Time,13:35:40
*
Probe no,01
Probe id,
Conversion,DIN90
Unassigned,Tmax,555.2,Tmin,-200.1
Units,None Set,R0=+100.0000,A=+3.90830x10-03,B=-5.77500x10-07,C=-4.18300x10-12,
Probe no,02
Probe id,
Conversion,DIN90
Unassigned,Tmax,555.2,Tmin,-200.1
Units,None Set,R0=+100.0000,A=+3.90830x10-03,B=-5.77500x10-07,C=-4.18300x10-12,
.
.
.
.
Probe no,41
Probe id,
Conversion,DIN90
Assigned to channel,03,Tmax,123.4,Tmin,-20.2,
Units,None Set,R0=+100.0000,A=+3.90830x10-03,B=-5.77500x10-07,C=-4.18300x10-12,
.
.
.
.
Probe no,72
Probe id,
Conversion,DIN90
Unassigned,Tmax,533.1,Tmin,-200.1
Units,None Set,R0=+100.0000,A=+3.90830x10-03,B=-5.77500x10-07,C=-4.18300x10-12,
All other probes are unassigned
ASL operating instructions, model CTR5000
161
CTR5000 Operating Instructions
19.4 Instrument report
CTR5000
Serial number,123/456789
Date,23/01/10,Time,13:39:45
*
S/W version,V0.1
Date format,dd/mm/yy
100R reference,99.998
200R reference,199.992,400R reference,399.999
Channels available,A,B,C,D
S252's present,1
S252,1,S/W version,0.00,Channels,16-31,Serial number,123/45678,PCB,123/45678,Built, 23/01/10,Used,4
Interfaces
USB
RS232
162
ASL operating instructions, model CTR5000
CTR5000 Operating Instructions
19.5 Smart probe report
CTR5000
Serial number,123/456789
Date,23/01/10,Time,14:34:14
*
Smart probe data for channel,01
Version,1
Locked,0
Serial no,ABCD
Cal date,01/01/10
Next cal date,01/01/11
Cal type,2,ITS90
Probe type,0,PRT
Wire type,0
Source,ASL-CTR5000
R_max,-1
R_min,0
R_max since,-1
R_min since,0
R_max ever,-1
R_min ever,0
Units,1,R
Reference R,0,100R
T conversion,0,DIN90
R0.01,+100.0000
Ap,3.90830e-03
Bp,-5.77500e-07
Cp,-4.18300e-12
Dp,0.00000e+00
An,0.00000e+00
Bn,0.00000e+00
WT90,0.00000e+00
Cal log count,00
ASL operating instructions, model CTR5000
163
CTR5000 Operating Instructions
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164
ASL operating instructions, model CTR5000
CTR5000 Operating Instructions
Appendix 8 – CTR5000 0.01 K PC commands
19.6 CTR5000 0.01 K PC commands
The following sections cover use of PC commands. These may be sent to the instrument via a
simple terminal program54, through some programming interface, from Excel™ (or similar
program) or interactively with a dedicated program (such as ULOG – supplied by ASL).
The PC symbol  will be briefly displayed when a command is received.
19.6.1 CTR5000 0.01 K Remote mode (local lockout)
The instrument may be set into Remote mode to prevent problems with simultaneous control
from a PC and from someone using the front panel keys. In Remote mode, the instrument can
only be controlled over the interface since the CTR5000’s front panel keys are locked out. To
enable Remote mode, the instrument must be sent a Local lockout command. The PC symbol
 will be permanently displayed in remote mode. Remote mode is cleared when the
instrument is switched on.
It is not necessary to be in remote mode to use any of the PC commands, but care must be
taken not to inadvertently change settings.
19.6.2 CTR5000 0.01 K Commands and Syntax
The following commands can be sent to the instrument - all commands are composed of
single letters, followed by none, one or two single digit parameters or letters (except the
switchbox commands, which have 2 alphabetical characters followed by 2 digits).
Commands are terminated by a carriage return character <CR> and/or a line feed <LF>
character.
Response data are always terminated by a carriage return and line feed character
<CR><LF>.
The instrument responds to all illegal or unrecognized commands with error 5.
A PC icon will flash briefly on the CTR5000 display when data are received. The icon will be
continuously present when the instrument is in remote mode.
54
A number of these are available free on the Web.
ASL operating instructions, model CTR5000
165
CTR5000 Operating Instructions
For ease of use, new commands, new details and additional information, not present with the
F250, are coloured blue.
A full list of commands follow –
166
ASL operating instructions, model CTR5000
CTR5000 Operating Instructions
19.6.3
A command
Function:
Requests the instrument to return the PRT reading (temperature or resistance)
and display units every time the display is updated. Any valid channel may be
selected (see below), and units may be C, F, K or W (when units are set to W
(ohms), data readings are returned followed by the letter R).
Examples:
"A 100.000C", "B 273.150K", "D 20.1501R" (quotes and comma are for clarity
only)
Note:
The returned data is 10 characters long +CR+LF. Leading spaces are inserted
before the value, when necessary - i.e. “
1.233C”, not “00001.233C”. The first
character after the channel character is either a space or a minus sign, or a
numerical digit (when over 1000 ).
Channels prefixes are return as A, B, C, D, E, F H (channel 8), I, J, K, L or M
(channel 13). Switchbox channels are return as two numerical digits – i.e. 16, 17,
etc followed by a S. Therefore, the string length is increased by two characters
for a switchbox channel.
The returned channel is variable in A B mode.
The command is cancelled when the instrument is changed to logging mode.
Syntax:
An, where n = 0 to 8 or Ann (see below)
Parameters An:
n = 0 selects PRT A
n = 1 selects PRT B
n = 2 selects PRT A - B (differential)
n = 3 selects alternate mode (A then B)
n = 4 cancels continuous output
n = 5 selects PRT C
n = 6 selects PRT D
n = 7 selects PRT E
n = 8 selects PRT F
Initial State:
n=4
Parameters Ann:
nn = any valid channel (new numbering)
ASL operating instructions, model CTR5000
167
CTR5000 Operating Instructions
nn = 00 cancels continuous output
Initial State:
19.6.4
n=4
C command (CTR5000 0.01 K only)
Function:
Clear – immediately resets the instrument to the home state.
Syntax:
C
Parameters:
None
Initial State:
Not applicable
Note:
this command does not require the LF (line feed) delimiter and must be upper
case (i.e. lower case c is ignored).
19.6.5
E command
Function:
Echo input text – useful when developing communications.
Syntax:
En
Parameters:
n = 1 turns echo ON
n = any other character, turns echo OFF
Initial State:
Echo OFF
Note: the instrument responds to this command with “echo on” or “echo off”
19.6.6
! command
Function:
Returns error 15 – useful when developing communications.
Syntax:
!
Parameters:
None
19.6.7
*I command
Function:
Returns information string about the instrument:
Manufacturer, Model, serial number, firmware version, date
Syntax:
*I
Parameters:
None
Example:
Returns, e.g. ASL,CTR5000,1234567/89,V1.0,22/01/10
19.6.8
168
F command
Function:
The analogue output is not implemented on the CTR5000.
Note:
Always returns Error 5
ASL operating instructions, model CTR5000
CTR5000 Operating Instructions
19.6.9
H command
Function:
Holds the current reading, or clears the hold command if already set.
Syntax:
H
Parameters:
None
Initial State:
OFF
Note:
Commands requesting a result or channel change will turn hold off
19.6.10
Hn command
Function:
Holds the current reading, or clears the hold command according to the
parameter following the H
Syntax:
H1 or H0
Parameters:
1 or 0 (H1 = ON; H0 = OFF)
Initial State:
OFF
Note:
Commands requesting a result or channel change will turn hold off
19.6.11 I command
Function:
Set the Probe Id string
Syntax:
Ims--s, where m>= 1 and m <= 72 (probe number)
Parameters:
Sets the Probe Id to s--s (10 characters maximum)
Note:
If the first character of the string is numeric, then the probe number must be two
digits long (e.g. for Probe 2, use I02s-s)
19.6.12 L command
Function:
Local lockout - enables or disables the instrument front panel controls.
Syntax:
Ln, where n = 0 or 1
Parameters:
n = 0 enables front panel (lockout OFF)
n = 1 disables front panel (lockout ON)
Initial State:
n = 0, lockout off
ASL operating instructions, model CTR5000
169
CTR5000 Operating Instructions
Note
To maintain F250 compatibility, global units are applied when
lockout is ON (and Smart probes are also disabled).
19.6.13 M command
Function:
Requests the instrument to return the PRT reading (temperature or resistance)
and display units every time the display is updated.
Examples:
"A 100.00C", "A273.150K02", "B100.1234R", "D120.1501R04".
Note:
Similar to the A command (see A command for further details). The arguments
and return values are slightly different, however.
Syntax
Ma, where a = @, A,B,C,D,I,J,K or L, or
Mab, where a and b specify a switchbox channel number
Parameters
a = @ cancels continuous output
a = A sets PRT to A and sends data when reading available.
a = B sets PRT to B and sends data when reading available.
a = C sets PRT to A-B and sends data when reading available.
a = D sets PRT alternately to A then B and sends data when reading available.
a = I sets PRT to A and sends data with channel number when reading available.,
a = J sets PRT to B and sends data with channel number when reading available.
a = K sets PRT to A-B and sends data with channel number when reading
available.
a = L sets PRT alternately to A then B and sends data with channel number when
reading available.
ab = 16 to 80, sets PRT to a switchbox channel number (if fitted). The CTR5000
channel number is always appended when this command is used (no leading
channel character). Note that 2 digits are required – i.e. a leading 0 is required
when the channel number is less than 10. Preceding channel data is not
supplied.
Initial State:
170
a=@
ASL operating instructions, model CTR5000
CTR5000 Operating Instructions
Note:
see also command A above
19.6.14 N command
Function:
Set Smart probe serial numbers
Syntax:
Nms--s, where m = S or m = O
Parameters:
m = S sets the Smart probe serial number to s--s (19 chars maximum)
m = O sets the Smart probe source to s--s (17 chars maximum)
19.6.15 P command
Function:
Set PRT input for display
Syntax:
Pn, where n = 0 to 8, A or B
Parameters:
n = 0 selects the A PRT input for display
n = 1 selects the B PRT input for display
n = 2 selects A - B (differential) for display
n = 3 selects C PRT input for display
n = 4 selects D PRT input for display
n = 5 selects E PRT input for display
n = 6 selects F PRT input for display
n = 8 also selects A - B (differential) for display
n = 9 selects B - A (differential) for display
n = A selects A B mode for display
n = B selects A/B mode for display
n = xx, where xx = 16 upwards (switchbox channels) selects channel xx
Initial State:
Current channel
Note:
Error 14 will be returned if the channel is not available
Error 5 will be returned if the channel is not recognised
19.6.16 Q or ? command
Function:
Query, the instrument will return the status of the function
Syntax:
?a or Qa, where a is P, R, U, Z or _
Parameters:
a = F queries analogue setting – always returns F0 (for F250 compatibility)
a = H queries the hold function - (0 = no zero set, 1 = zero set)
a = L queries the remote status - (0 = OFF, 1 = ON)
ASL operating instructions, model CTR5000
171
CTR5000 Operating Instructions
a = M returns last command
a = P queries the PRT setting – returns the current channel (n) (see P command)
a = R queries the resolution - return setting 0 or 1
(see R command for
parameters)
a = U queries the units - return setting 0, 1, 2 or 3
(see U command for
parameters)
a = Z queries the zero function - (0 = no zero set, 1 = zero set)
a = _ queries all settings - returns reading + all settings. (26 characters +CR+LF
normally, 27 characters +CR+LF in high res. with units set to Ohms).
Example:
A 24.998RF0H0L0M@P0R1U3Z0
Initial State:
Not applicable
19.6.17 R command
Function:
Sets the instrument resolution
Syntax:
Rn, where n = 0, 1, 2 or 3
Parameters:
n = 0 selects 2 decimal places (3 decimal places for ohms)
n = 1 selects 3 decimal places (4 decimal places for ohms)
n = 2 selects 1 decimal places (2 decimal places for ohms)
n = 3 selects 0 decimal places (1 decimal places for ohms)
n = 4 selects 0 decimal places for ohms
Initial State:
Current resolution
19.6.18 S command
Function:
Remote control of the CTS5000-8, CTS5000 -16 switchboxes (if connected)
Syntax:
Smn, where m = A or B (C or D) and n is a number 00 to 15.
Parameters:
m = A, B, C or D (must be present). A selects the first switchbox, B selects the 2nd,
C the 3rd and D the 4th. n = the number of the channel on the selected
switchbox.
Initial State:
No switchbox channel selected.
Note:
4 characters must be sent to form a valid command, for example SA02, SB13,
SC03. Error 14 is returned if the channel is not available.
172
ASL operating instructions, model CTR5000
CTR5000 Operating Instructions
ASL operating instructions, model CTR5000
173
CTR5000 Operating Instructions
19.6.19 T or D command
Function:
Asks the instrument to send the current channel’s PRT reading and selected units.
Examples:
"A 0.003C", or "B 75.149K".
Note:
See note for A command
Syntax:
T or D
Parameters:
None
Initial State:
Not applicable
19.6.20 U command
Function:
Sets the units to °C, °F, K or W (ohms)
Syntax:
Un, where n = 0, 1, 2 or 3
Parameters:
n = 0 selects °C
n = 1 selects K
n = 2 selects °F
n = 3 selects W (ohms)
Initial State:
Current units
Note:
when units are set to W (ohms), data readings are returned followed by the letter
“R”.
Note:
E5 is returned when A/B or A B modes are selected
19.6.21 Z command
Function:
Sets present reading to zero, or clears zero setting if already set
Syntax:
Z
Parameters:
None
Initial State:
OFF
19.6.22 Zn command
174
Function:
Sets the current reading to zero or returns to normal operation.
Syntax:
Z1 or Z0
Parameters:
1 or 0 (Z1 = ON; H0 = OFF)
Initial State:
OFF
ASL operating instructions, model CTR5000
CTR5000 Operating Instructions
Note
Commands (when valid) that disable Hold are P, A, M, T, D and
U.
19.6.23 CTR5000 0.01 K Error codes
These are the same as the CTR5000 (see section 9).
ASL operating instructions, model CTR5000
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CTR5000 Operating Instructions
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CTR5000 Operating Instructions
20. Specifications
20.1 Resistance thermometer measurement55
PRT characterisation
ITS90, Din90 BS EN60751:1996, IEC60751:1983
CvD
Resistance measurement range
0 to 500  (125  with 25 ohm reference)
Temperature measurement range
ITS90
-201 to +962ºC
Din90
-201 to +858ºC
CvD
-150 to +850ºC
Measurement interval
0.5 seconds
Display resolution
1 mK (0.1 m when in resistance mode)
Accuracy (resistance)
± 2m (+20°C ±5°C)
Accuracy (temperature)
± 5mK (+20°C ±5°C)
User selectable measurement display
ºC, ºF, K or ohms
PRT current
55
BSEN1904:1984, IEC751:1983
1 mA constant current (100 ohm reference)
2 mA constant current (25 ohm reference)
Internal reference resistors
25 and 100
Internal reference resistors stability (typically)
 0.1 ppm/C
Internal reference resistors accuracy (typically)
 0.01% (uncalibrated)
Input channels
2, (4 or 6 optionally)
Input connection
5 pin DIN
Expansion port (optional)
CTS5000-8, S500-16 (4 maximum)
Internal log
8000 points (non-volatile)
External logging
65000 points to external interface
Log interval
1 sec to 99 secs or 1 minute to 99 minutes
Measurements do not include uncertainties to the sensor. A warm-up time of 20 minutes is required to meet specification
ASL operating instructions, model CTR5000
177
CTR5000 Operating Instructions
20.2 Display
Liquid Crystal Display (LCD)
160 x 80 (adjustable contrast)
20.3 Power supply
Mains charger supply voltage range
90Vac – 264Vac
Power consumption
25VA max
Supply frequency range
47Hz - 63Hz
Fuse
T1A 250 Vac (anti surge)
20.4 Environmental
Storage temperature range
-20ºC to +50ºC
Service temperature range
+15ºC to +35ºC
Specified operating temperature range
+15ºC to +25ºC
Operating relative humidity conditions
<80% RH, non-condensing
20.5 Dimensions and weight
Dimensions
80 x 260 x 240 (h x w x d)
Weight
2.6 kg
20.6 Approvals
The CTR5000 has been designed to comply with current standards and safety legislation. The instrument
complies with IEC61010-1 and conforms to the low-voltage and EMC directives.
178
ASL operating instructions, model CTR5000
CTR5000 Operating Instructions
Index
A
Abreviations
PRT ..................................150
Pt100 ...............................150
RTD ..................................150
AC Bridge basics..............157
Auto Reference resistor .....75
C
Calibration ..........................76
Calibration equipment ....106
Calibration menu ...............76
Automatic method .........80
Method ............................78
Reference resistor ...........77
Channel addresses ............45
Channel key .......................40
Channels and probes ........62
Check resistor .....................21
Cleaning ...........................148
Comms ................................92
Comms menu .....................92
RS232/IEEE options ..........93
Time/Date ........................95
View status ......................92
Communications..............110
Contrast ...............................96
Conversion algorithms
CvD ................................153
DIN ..................................156
ITS-90 ..............................154
CTR5000 .....................169, 174
CTR5000 0.005K vs 0.01K ....18
CTR5000 Error codes ........146
CTR5000 PC commands
! command ...................168
*I command ..................168
A command ..................167
C command ..................168
E command...................168
F command ...................168
H command ..................169
I command ...................169
L command ................... 169
M command ................. 170
N command.................. 171
P command .................. 171
Q or ? command .......... 171
R command .................. 172
S command .................. 172
T or D command ........... 174
U command .................. 174
Z command .................. 174
CTR5000 PC commands .. 165
CTR5000 PC commands .. 165
CTR5000 Remote mode ... 165
CTR5000 vs F250 ................. 17
CvD .............. 21, 104, 153, 177
D
Data Pairs
Ag(0.01,961.78C) to Ar ( 192.35,0C) .............. 103
Calculate ...................... 102
CvD ................................ 103
CvD (A=R, B=T) .............. 103
Edit ................................. 100
menu................................ 99
Procedure ....................... 98
Data Pairs
Introduction..................... 98
Definitions
Alpha ............................. 150
milli-degree C............... 150
milli-degree F................ 150
milli-Kelvin ..................... 150
Definitions and terminology
........................................ 150
Definitions and terminology
.......................................... 17
Diagnostics ......................... 97
DIN ....................... 21, 153, 156
Display key
Full .................................... 38
Graphical ........................ 40
Normal ............................. 38
Statistical ......................... 39
ASL operating instructions, model CTR5000
Display key ......................... 38
Display key ......................... 38
Display key ......................... 39
Display key ......................... 40
Disposal information ......... xiii
Batteries ......................... xiii
E
Editor ................................... 41
Example reports ...... 159, 160,
161, 162, 163
All probes report .......... 161
Assigned probe report 160
Channel report ............. 159
Instrument report .......... 162
Smart probe report ...... 163
Expansion port ................... 31
External logging ................. 58
External logging screen .... 59
F
Features .............................. 15
Firmware update ............. 151
Front panel ......................... 24
Function keys
Chan ................................ 27
Escape............................. 27
Hold ................................. 27
Menu ............................... 27
Unit ................................... 27
Zero .................................. 27
G
Getting started ................... 21
H
Hold key.............................. 37
I
IEEE interface .................... 111
Input connections.............. 28
Installation information ...... xi
Internal 100 Ω check resistor
......................................... 29
179
CTR5000 Operating Instructions
Internal logging screen .....55
Introduction ........................15
ITS-90..................153, 154, 155
K
Keypad ................................26
L
LAN interface ....................116
LCD display .........................25
LED .......................................25
Logging .......55, 56, 57, 58, 59
Internal logging menu ...54
menu ................................54
Logging interval .................56
Logging limitations .............59
M
Main menu items ...............44
Calibration… ...................44
Comms… .........................44
Contrast ...........................44
Diagnostics… ..................44
Options… .........................44
Probes… ..........................44
Smart probes… ...............44
Time/Date… ....................44
Utilities… ..........................44
Mains input .........................31
Maintenance ....................148
Manual convensions ........ viii
Measurement principles ...18
Measurement ranges ......104
Measurement units ............19
N
Name plate .........................31
Numeric keys
Display modes ................27
Enter .................................27
numbers ...........................27
O
Operating modes .........34, 42
Measurement mode ......34
Menu mode.....................42
Menu soft-key .................42
Options menu .....................86
Buzzer ...............................89
CTR5000/F250 mode .......91
Data separator ................90
180
Date format ..................... 90
Key buzzer ....................... 89
Rs/t display...................... 91
Security ............................ 87
Standby ........................... 89
Over/under range ........... 104
Overview ............................. 15
P
Passive and Smart probes 28
PC command syntax ....... 117
PC commands ......... 110, 117
*IDN? .............................. 120
CONFigure
CHANnel
FITTed? ...................... 128
SMARt? ...................... 130
CHANnel .................... 128
CHANnel? .................. 128
IEEE? ........................... 129
LAN? ........................... 129
REFErence .................. 130
REFErence? ................ 130
SERIal? ........................ 129
SYSTem
CALIbrated ? .............. 121
DISPlay
RESOlution ? .......... 122
F500/F252....................... 119
MEASure
CURRent? ................... 127
PROBe
ASSIgn ........................ 132
ASSIgn ? ..................... 132
COEFficient ................ 136
COEFficient? .............. 137
IDENtifier ..................... 132
IDENtifier ? .................. 133
STANdard ................... 135
STANdard? ................. 135
TMAX .......................... 133
TMAX? ........................ 133
TMIN............................ 134
TMIN ?......................... 134
UNIT............................. 135
UNIT ?.......................... 136
SENSe
FRTD
ENABle ...................... 144
ENABle? ..................... 144
FRTD
CAL
DATE ..................... 139
DATE?.................... 139
NEXT ..................... 139
NEXT? ................... 139
SOURce .................. 140
SOURce? ................ 140
COEFficient ................ 141
COEFficient? .............. 142
IDENtification ............ 142
IDENtification ? ......... 142
LOCK ......................... 143
LOCK? ....................... 144
RANGe ....................... 143
RANGe? ..................... 143
REFErence .................. 141
REFErence? ................ 141
STANdard .................. 140
STANdard? ................. 141
ZERO ........................... 144
ZERO? ......................... 145
SYSTem
ACKNowledge .......... 121
BEEPer ........................ 125
DATE ........................... 122
DATE ? ........................ 122
DISPlay
RESOlution................. 121
DISPLay
TIME .......................... 124
LOCal ......................... 120
MESSage .................... 125
PASSword ................... 123
PASSword ? ................ 123
PCB ? .......................... 125
REMote ....................... 120
SNUMber ? ................. 125
TIME ............................ 123
TIME ? ......................... 124
SYSTEM
ECHO.......................... 124
UNIT
TEMPerature............... 138
TEMPerature?............. 138
PC CTR5000 commands
Syntax .................... 165, 175
Probe connections ...... 28, 29
2 wire Passive ................. 29
4 wire Passive ................. 29
ASL operating instructions, model CTR5000
CTR5000 Operating Instructions
4 wire Smart probe .........29
Probe menu .....63, 64, 71, 72,
73, 74
Assign to channel ...........71
Conversion ......................67
Edit coefficients ..............69
Probe id ...........................70
Probe selection ...............64
Review coefficients ........69
Set Tmax ..........................72
Set Tmin......................73, 74
Set units ............................72
Unassign from channel ..71
Probe review and edit .63, 66
Probe safety information ... xii
R
Rating plate ........................31
Rear panel connections ....31
Reference resistor menu ...75
Reference resistors .............75
Remote mode...................117
Resistors
Rs definition ....................157
Rt definition .................... 157
Resolution ........................... 38
RS232 interface ................. 115
RS232/LAN/IEEE 488 options
.......................................... 32
S
Safety information ............... ix
Scanning ............................. 60
Security ................... 19, 87, 88
Low ................................... 88
Medium ........................... 88
Off..................................... 88
Selecting channels 45, 47, 49
CTS5000 ........................... 49
Difference channels ....... 47
Serial number ..................... 31
Service .............................. 149
Set group conversion ....... 74
Setting operating conditions
.......................................... 36
Smart probe menu ............. 81
Specifications ................... 177
Switchbox addresses......... 49
ASL operating instructions, model CTR5000
T
Technical support ............ 149
Temperature measurement
......................................... 18
U
Unpacking .......................... 20
USB ............................... 32, 110
USB memory stick connector
......................................... 25
Utilities menu ...................... 83
V
View int log ......................... 57
W
Warranty ........................... 149
X
Xmit log ............................... 58
Z
Zero key .............................. 37
181
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