Manta MTS-1030 User Manual

Manta MTS-1030 User Manual
MULTI-FUNCTION POWERMETER
OPERATION AND REFERENCE MANUAL
Fourth Edition
November 1997
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TEST SYSTEMS
Manta Tczst Systems
40608 Sladeview Crescent, Unit 1
Mississauga, Ontario L5L 5Y5
Tel: 905-828-6469 Fax: 905-828-6850
www.mantatest.com e-mail:support@mantatest.com
MTS-1 030 Multi-Function Powermeter, Operation and Reference Manual
All rights reserved by Manta Test Systems Incorporated. No part of this publication may be reproduced or distributed
in any form or by any means without the permission of Manta Test Systems Incorporated.
The information and specifications contained within from Manta Test Systems is believed to be accurate and reliable
at the time of printing. However, because of the nature of this product, specifications shown in this manual are subject
to change without notice.
The features and capabilities described herein reflect those available in MTS-1 03 0 firmware version 3.0.
November 1997.
Document ID#:CU F001 01 B
TEST SYSTEMS
Manta Tvst Systvms
40608 Sladeview Crescent, Unit 1
Mississauga, Ontario L5L 5Y5
Tel: 905-828-6469 Fax: 905-828-6850
www.mantatest.com e-mail:support@mantatest.com
TABLE OF CONTENTS
SECTION 1
INTRODUCTION
.................................................................... ·········· ..................................................................... 1-1
1.1
DISTINCTIVE CHARACTERISTICS ................................................................................. 1-1
1.2
GENERAL DESCRIPTION ............................................................................................... 1-1
1.3
APPLICATIONS ................................................................................................................ 1-1
1.4
IMPORTANT SAFETY PRECAUTIONS .......................................................................... 1-2
1.5
LIMITED PRODUCT WARRANTIES ............................................................................... 1-2
SECTION 2
SPECIFICATIONS
·········································· ·········································· ·········································· ····················· 2-1
2.1 FREQUENCY MEASUREMENT ...................................................................................... 2-1
2.2
TIME MEASUREMENT ..................................................................................................... 2-1
2.2.1 Time (Seconds) Mode ........................................................................................ 2-1
2.2.2 Time (Hertz) Mode ............................................................................................. 2-1
2.3
PHASE MEASUREMENT ................................................................................................. 2-2
2.4
VOLTAGE MEASUREMENT ............................................................................................ 2-2
2.5
CURRENT MEASUREMENT ............................................................................................ 2-3
2.6
POWER
2.6.1
2.6.2
2.6.3
2.6.4
2.7
EXTERNAL TRIGGER ..................................................................................................... 2-4
2.8
POWER SUPPLY ............................................................................................................. 2-4
2.9
RS-232C SERIAL COMMUNICATIONS PORT ................................................................ 2-4
MEASUREMENTS ............................................................................................. 2-3
Kilowatts ............................................................................................................. 2-3
Kilovars ............................................................................................................... 2-3
Kilovoltamperes ................................................................................................. 2-3
Power Factor ..................................................................................................... 2-3
2.10
PHYSICAL CHARACTERISTICS ................................................................................... 2-5
2.11
OPTIONS ........................................................................................................................ 2-5
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SECTION 3
BASIC OPERATION
................................................................................................................................................... 3-1
3.1
PRINCIPLE OF OPERATION ........................................................................................... 3-1
3.1.1 Trigger States .................................................................................................... 3-1
3.1.2 Applications of Trigger States ........................................................................... 3-2
3.2
MAKING BASIC MEASUREMENTS ................................................................................ 3-2
3.2.1 AC/DC Voltage Measurement ........................................................................... 3-2
3.2.2 AC Current Measurement .................................................................................. 3-2
3.2.3 Frequency Measurement .................................................................................. 3-3
3.2.4 Phase Measurement .......................................................................................... 3-3
3.2.4.1 BASIC USAGE .................................................................................... 3-3
3.2.4.2 ±180° DISPLAY MODE ..................................................................... 3-3
3.2.4.3 LOW INPUT BLANKING ..................................................................... 3-3
3.2.5 Power Measurements ........................................................................................ 3-3
3.2.5.1 BASIC USAGE .................................................................................... 3-3
3.2.6 Timing Measurements ........................................................................................ 3-4
3.2.6.1 OVERCURRENT RELAY TIMING EXAMPLE ..................................... 3-4
3.2.7 Measurements in 3-Phase Systems ................................................................... 3-5
SECTION 4
DETAILED OPERATION
................................................................................................................................................... 4-1
4.1
FRONT PANEL FEATURES ............................................................................................. 4-1
4.1.1 Front Panel Layout ............................................................................................. 4-1
4.1.2 Channel 1 & 2 Displays [1 ,5] ............................................................................. 4-2
4.1.3 Channel 1 & 2 IN Switches [2,6] ........................................................................ 4-2
4.1.4 Phase Select Push buttons [3,7] ......................................................................... 4-2
4.1.5 <t>-<D/<t>-N Select Switches [4,8] ......................................................................... 4-2
4.1.6 Channel 1 & 2 Current Inputs [11] ..................................................................... 4-2
4.1.7 Channel1 & 2 Voltage Inputs [9] ........................................................................ 4-3
4.1.8 Phase Rotation Indicator LEOs [1 0] ................................................................... 4-3
4.1.9 FTP Display [12] ................................................................................................. 4-3
4.1.1 0 FTP Display Select Pushbuttons [13] .............................................................. 4-3
4.1.1 0.1 FREQUENCY .................................................................................... 4-4
4.1.10.2 KILOWATTS ...................................................................................... 4-4
4.1.10.3 TIME SEC .......................................................................................... 4-4
4.1.10.4 KILOVARS ......................................................................................... 4-4
4.1.10.5 TIME HZ ............................................................................................ 4-4
4.1.10.6 KILOVOLTAMPERES ....................................................................... 4-4
4.1.1 0. 7 PHASE .............................................................................................. 4-4
4.1.10.8 OBTAINING ACCURATE PHASE READINGS ................................. 4-4
4.1.1 0.9 POWER FACTOR. ............................................................................ 4-5
4.1.11 On/Off Switch [14] ............................................................................................ 4-5
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4.1.12
4.1.13
4.1.14
4.1.15
4.1.16
4.1.17
4.1.18
4.2
Measurement Response Switch [15] ............................................................... 4-5
Range AUTO/MAN Switch [16] ....................................................................... 4-5
External Trigger Start Terminals [20] .............................................................. 4-6
Start LED [17] ................................................................................................. 4-6
External Trigger Stop Terminals [21] ............................................................... 4-6
4.1.16.1 TWO WIRE PULSE TIMING ........................................................... 4-6
RESET [Tone Enable] Switch [19] ................................................................... 4-7
Stop LED [18] .................................................................................................. 4-7
REAR PANEL FEATURES ............................................................................................... 4-8
4.2.1 Rear Panel Layout ............................................................................................. 4-8
4.2.2 External Reset Terminals .................................................................................. 4-8
4.2.3 DIP Switches ..................................................................................................... 4-9
4.2.3.1 DIP SWITCH #1 .................................................................................. 4-9
4.2.3.2 DIP SWITCH #2 .................................................................................. 4-9
4.2.3.3 DIP SWITCH #3 .................................................................................. 4-9
4.2.3.4 DIP SWITCH #4 .................................................................................. 4-9
4.2.3.5 DIP SWITCH #5 .................................................................................. 4-9
4.2.3.6 DIP SWITCHES #6-8 .......................................................................... 4-9
4.2.4 AUX 1/0 Connector ............................................................................................ 4-9
4.2.5 RS-232C Connector .........................................................................................4-1 0
4.2.6 Print/Baud Rate Pushbutton ........................................................................... 4-10
4.2.7 IEEE-488 Connector ....................................................................................... 4-10
SECTION 5
RS-232C INTERFACE
.......................................... .......................................... .......................................... .................... 5-1
5.1
INTRODUCTION .............................................................................................................. 5-1
5.2
RS-232C CONNECTIONS .............................................................................................. 5-2
5.3
COMMAND DESCRIPTIONS ........................................................................................... 5-3
5.3.1 Function Control Commands ............................................................................ 5-3
5.3.2 Auxiliary Port Control ........................................................................................ 5-5
5.3.3 Output Commands ............................................................................................ 5-6
5.3.4 Tabular Output ................................................................................................... 5-8
5.3.4.1 EXAMPLE USAGE .............................................................................. 5-8
5.3.4.2 DESCRIPTION TABULAR OUTPUT COMMANDS ............................ 5-9
5.3.5 Program/Terminal Modes ................................................................................ 5-10
5.4
COMMAND SUMMARY ................................................................................................ 5-10
5.4.1 Meter function control commands .................................................................... 5-1 0
5.4.2 Output related commands ................................................................................ 5-11
5.5
DEFAULT PARAMETERS .............................................................................................. 5-11
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SECTION 6
MTS-1 030 OPTIONS
................................................................................................................................................... 6-1
6.1
OPTION
6.1.1
6.1.2
6.1.3
6.1.4
6.2
MTS-1030 OPTION -04: 12VDC OPERATION/BATTERY ............................................... 6-3
6.2.1 Description ......................................................................................................... 6-3
6.2.2 Option Contents ................................................................................................. 6-3
6.2.3 Instructions for Use ............................................................................................ 6-3
6.3
MTS-1030 OPTION -09: RATIO NB MEASUREMENT OPTION ..................................... 6-3
6.3.1 Operation ............................................................................................................ 6-3
6.3.2 Specifications ..................................................................................................... 6-4
6.3.3 New RS-232C Commands ................................................................................. 6-4
6.4
MTS-1030 OPTION-10: FREQUENCY DIFFERENCE MEASUREMENT OPTION ......... 6-4
6:4.1 Operation ........................................................................................................... 6-4
6:4.2 Specifications ..................................................................................................... 6-5
6.4.3 New RS-232C Commands ................................................................................. 6-5
6.4.4 Affects on Reading Speed .................................................................................. 6-5
6.5
MTS-1030 OPTION -14: SYNCHROCHECK OPTION ..................................................... 6-6
·6.5.1 Introduction ........................................................................................................ 6-6
6.5.2 Operation ........................................................................................................... 6-6
6.5.2.1 ENABLING/DISABLING THE SYNCHROCHECK OPTION ................ 6-6
6.5.2.2 PHASE MEASUREMENT IN "READY" MODE. .................................. 6-6
6.5.2.3 FROZEN MEASUREMENT ON STOP TRIGGER. ............................. 6-6
6.5.2.4 DUAL MODE PHASE DISPLAY .......................................................... 6-7
6.5.3 Specifications ..................................................................................................... 6-7
6.5.4 Use with the RS-232C PPH Command .............................................................. 6-8
6.5.5 Compatibility with Other Options ........................................................................ 6-8
6.6
MTS-1030 OPTION -15: WATTHOUR MEASUREMENT OPTION .................................. 6-8
6.6.1 Description ......................................................................................................... 6-8
6.6.2 Operation ........................................................................................................... 6-8
6.6.2.1 MEASURING WATTHOURS ............................................................... 6-8
6.6.2.2 LIMITATIONS ...................................................................................... 6-9
6.6.3 RS-232 Control. .................................................................................................. 6-9
6.7
MTS-1030 OPTION -17: SIGNAL PROCESSING ............................................................ 6-9
6.7.1 Description ......................................................................................................... 6-9
6.7.2 Operation ......................................................................................................... 6-10
6.7.2.1 LOW PASS FILTER. ......................................................................... 6-10
6. 7 .2.2 AVERAGE RESPONSE. .................................................................. 6-1 0
6.7.2.3 PEAK RESPONSE. .......................................................................... 6-10
-03 IMPEDANCE MEASUREMENT ................................................................... 6-1
Reading Accuracy .............................................................................................. 6-1
Front Panel Display ............................................................................................ 6-1
New RS-232C Commands ................................................................................. 6-2
Tabular Output ................................................................................................... 6-2
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6.8
MTS-1030 OPTION -18: EXTENDED LOW LEVEL PHASE MEASUREMENT ............ 6-11
6.8.1 Description ....................................................................................................... 6-11
6.8.2 Operation ......................................................................................................... 6-11
SECTION 7
IEEE-488 INTERFACE
.......................... ································································ ... ············· ........................................ 7-1
7.1
INTRODUCTION .............................................................................................................. 7-1
7.2
IEEE-488 CONNECTOR PINOUT .................................................................................... 7-1
7.3
IEEE-488 Address DIP Switch .......................................................................................... 7-2
7.4
IEEE-488 SUB-SET IMPLEMENTATION ......................................................................... 7-2
7.5
INTERFACE COMMANDS AND MTS-1030 SPECIFIC COMMANDS ............................. 7-2
7.5.1 Interface Commands .......................................................................................... 7-3
7.5.2 MTS-1030 Specific Commands ......................................................................... 7-4
7.6
MTS-1030 IEEE-488 PROGRAMMING ............................................................................ 7-4
7 .6.1 Annunciators ...................................................................................................... 7-4
7.6.2 Sending Commands to the MTS-1030 ............................................................... 7-4
7.6.3 Receiving Data from the MTS-1030 ................................................................... 7-4
7.6.4 Examples ........................................................................................................... 7-4
7.6.5 Service Request. ................................................................................................ 7-6
7.6.6 Serial Polling ...................................................................................................... 7-6
7.6.7 Device Clear Function ........................................................................................ 7-7
7.6.8 Modified Operation of RS-232 Commands ........................................................ 7-7
7.6.9 New Commands ................................................................................................ 7-8
7.7
SIMULTANEOUS USE OF IEEE-488 AND RS-232C INTERFACES ............................. 7-10
SECTION 8
POWERSCOPE
........................................ ·················· ........................................................................................ 8-1
8.1
FEATURES ...................................................................................................................... 8-1
8.1.1 Operation Instructions ......................... ;.............................................................. 8-2
8.2
PARAMETERS ................................................................................................................. 8-2
8.3
ACTUAL WINDOW ........................................................................................................... 8-4
8.4
SYMMETRICAL COMPONENTS ..................................................................................... 8-4
8.4.1 Current Components Window ........................................................................... 8-4
8.4.2 Voltage Components Window ........................................................................... 8-4
8.4.3 Interpretation of Symmetrical Components Displays ......................................... 8-4
8.5
IMPEDANCE WINDOW .................................................................................................... 8-6
8.5.1 Using The Impedance Window .......................................................................... 8-6
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8.5.2
8.6
Scaling The Impedance Window ........................................................................ 8-6
SPECIAL NOTES .............................................................................................................. 8-7
SECTION 9
SERVICING
................................................................................................................................................... 9-1
9.1
TROUBLESHOOTING ..................................................................................................... 9-1
9.2
CALIBRATION PROCEDURE ......................................................................................... 9-1
9.2.1 Setup Requirements ........................................................................................... 9-1
~9.2.2 Procedure .......................................................................................................... 9-2
9.3
EPROM REPLACEMENT PROCEDURE ........................................................................ 9-3
9.3.1 Procedure .......................................................................................................... 9-3
APPENDIX A
HIGH SPEED MEASUREMENTS
.................................................................................................................................................. A-1
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SECTION 1
INTRODUCTION
1.1 DISTINCTIVE CHARACTERISTICS
• Ten simultaneous measurements
• c;;ompact and lightweight
• Flexible computer interface allows
programmability
• True RMS and full autoranging
• Optimized for relay testing work
• Two wire pulse timing mode
• High speed measurement mode output for all readings
• Easy-to-use ergonomic design
1.2 GENERAL DESCRIPTION
TheMTS-1030 is an enhanced version of the standard MTS-1010 meter, containing as standard
equipment some of the optional features of the MTS-1 010, plus additional new features designed
to increase it's usefulness in metering as well as protective relaying applications. Three phase four
wire voltage inputs with integrated phase sequence detector, plus three current inputs equipped
with large easy-connect terminals facilitate the connection of all signals from a three phase system
prior to making measurements. Phase select pushbuttons combined with <D-<1>/<D-N and phase invert
facilities make it easy to select any phasor for measurement by either channel of the meter.
Standard ultra-high intensity LED displays are easy to read even in direct sunlight. An optional
internal battery pack supplied with 12V automotive plug allow it to be used away from mains
supplies.
1.3 APPLICATIONS
• Test and calibration of virtually any relay including:
Synchrocheck
Under/overvoltage
Differential
Directional restrained overcurrent
Impedance
Voltage restrained overcurrent
Reverse power
Timed overcurrent
DC Timer
Pilot wire
Volts per Hertz
Under/overfrequency
• Verification of metering installations for accuracy, polarity, and potential transformer and
current transformer ratios
• Monitor outputs of unmetered electronic test systems
• Automated data logging, power factor surveys, load profiles, etc.
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1.4
IMPORTANT SAFETY PRECAUTIONS
HIGH VOLTAGE CAN BE LETHAL!!
This instrument can be used to measure high levels of voltage and current. Incorrect usage may
cause injury to the instrument or to the user. The user must be qualified to work safely in the
intended application environment of the instrument. Failure to adhere to the following minimum
requirements constitutes misuse of the instrument, and the manufacturer accepts no liability for
damages arising from such misuse.
1.
The instrument case must always be effectively grounded. The rear panel grounding stud
must be connected via 12 gauge wire to a known secure ground to supplement the power
supply cord ground.
2.
Voltage signals to the instrument must be supplied via high rupture capacity leads. Retractable shroud safety leads such as the pair supplied with the instrument are available from the
distributor.
3.
Current signals to the instrument must be supplied via minimum 14 gauge unfused leads
securely fastened with C-hook terminals, when in-service current measurements are being
taken. This is also recommended as a minimum when measurements are being performed.
4.
Never exceed maximum instrument ratings, namely:
(a)
500 VRMS to ground/600 VRMS differential to any voltage input.
(b)
75 amps continuous, 150 amps for five seconds to Channel A, B , & C current inputs.
(c)
500 VRMS to ground/300 V peak differential to trigger inputs.
Always employ good safety practices, such as last made/first broken connections to energy
sources, verifying integrity of leads before taking measurements, and keeping the leads and
instrument in good condition.
1.5 LIMITED PRODUCT WARRANTIES
1.5.1
Hardware
Manta Test Systems warrants that its hardware products and the hardware components of its
products shall be free from defects in materials and workmanship under normal use and service
for a period of one year from the date such products are shipped from Manta Test Systems.
Provided that Manta Test Systems receives notice of any defects in materials or workmanship of
its hardware products or hardware components of its products within such one-year period, Manta
Test Systems shall at its option, either repair or replace the defective hardware product or hardware
component, if proven to be defective.
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1.5.2 Software & Firmware
Manta Test Systems warrants that its software products and the software and firmware components of its products shall not to fail to execute their programming instructions under normal use
and service, due to defects in materials and workmanship if properly installed on intended
hardware, for a period of one year from the date such products are shipped from Manta Test
Systems. Provided Manta Test Systems receives notice of such defects within the warranty period,
it shall at its option, either repair or replace the software or firmware media if proven to be defective.
1.5.3 Separate Extended Warranty for Hardware Products
Aside from the standard warranty set forth above, Manta Test Systems offers a separate extended
warranty plan for all hardware products (excluding cables, batteries and accessories) which may
be purchased and extends the standard warranty by one additional year. The extended warranty
is issued under the same terms, conditions and exclusions as the standard warranty set forth
herein. Pricing is based on the cost of the product and the average cost of servicing and calibration.
Refer to the Manta Test Systems price list available from your local representative or Manta Test
Systems for extended warranty pricing for specific products. The extended warranty must be
purchased and paid for within 3 months from the date the product is shipped from Manta Test
Systems.
EXCLUSION OF OTHER WARRANTIES AND LIMITATION OF REMEDIES
1.5.4 Exclusion of Other Warranties
THE FOREGOING WARRANTIES ARE EXCLUSIVE, AND ARE IN LIEU OF ANY AND ALL
OTHER WARRANTIES (WHETHER WRITTEN, ORAL OR IMPLIED), INCLUDING BUT NOT
LIMITED TO WARRANTY OF MERCHANTABILITY IN OTHER RESPECTS THAN AS SET
FORTH ABOVE AND WARRANTY OF FITNESS FOR A PARTICULAR PURPOSE.
Limitation of Liability and Remedies
IT IS UNDERSTOOD AND AGREED THAT MANTA TEST SYSTEMS'S LIABILITY AND PURCHASER'S SOLE REMEDY, WHETHER IN CONTRACT, UNDER ANY WARRANTY, IN TORT
(INCLUDING NEGLIGENCE), STRICT LIABILITY OR OTHERWISE SHALL NOT EXCEED THE
COST OF REPAIR OR REPLACEMENT OF MANTA TEST SYSTEMS'S PRODUCTS, AS SET
FORTH ABOVE, AND UNDER NO CIRCUMSTANCES SHALL MANTA TEST SYSTEMS BE
LIABLE FOR ANY SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING
BUT NOT LIMITED TO, PERSONAL INJURY, PROPERTY DAMAGE, DAMAGE TO OR LOSS
OF EQUIPMENT, LOST PROFITS OR REVENUE, COSTS OF RENTING REPLACEMENTS AND
OTHER ADDITIONAL EXPENSES. FURTHERMORE, IT IS UNDERSTOOD AND AGREED
THAT MANTA TEST SYSTEMS SHALL NOT BE LIABLE FOR ANY DAMAGES, LOSSES OR
EXPENSES AS A RESULT OF THE PURCHASER'S OR ANYONE ELSE'S
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i.
NEGLIGENCE (WHETHER DEEMED ACTIVE OR PASSIVE),
ii.
MISUSE, ABUSE, OR MODIFICATION OF MANTA TEST SYSTEMS'S PRODUCTS,
iii
USE OR OPERATION OF PRODUCTS NOT IN CONFORMITY WITH THE SPECIFICATIONS AND INSTRUCTIONS FURNISHED BY MANTA TEST SYSTEMS FOR ITS PRODCTS,
iv REPAIR OR MAINTENANCE OF MANTA TEST SYSTEMS'S PRODUCTS BY PERSONS ·
OR ENTITIES WHO ARE NOT AUTHORIZED BY MANTA TEST SYSTEMS, OR
v
DAMAGE TO OR DESTRUCTION OF PRODUCTS DURING DELIVERY TO MANTA TEST
SYSTEMS FOR ANY REASON.
Limitation of Warranty Regarding Software
Manta Test Systems does not warrant that the operation of the software, firmware or hardware
shall be uninterrupted or error free.
1.5.5 Extension of Warranty
At the discretion of Manta Test Systems, the warranty may be extended for a product which has
been returned for service shortly after its warranty period has expired.
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SECTION 2
SPECIFICATIONS
Three independent current input channels are provided, plus a three-phase four-wire voltage input.
All other electrical parameters are derived from these inputs and shown when selected in the upper
display.
2.1 FREQUENCY MEASUREMENT
Resolution:
Accuracy:
Range:
Speed:
Annunciation:
0.01 Hz (low scale), 0.1 Hz (high scale)
±0.01 Hz (low scale), ±0.1 Hz (high scale)
20.00- 99.99 Hz (low scale)
15.0- 500.0 Hz (high scale)
Measurement speed is dependent on input frequency
For 60 Hz inputs:
2 readings/sec
7.5 readings/sec in START state
For 50 Hz inputs:
1.6 readings/sec
6.3 readings/sec in START state
Annunciator shows Hz
Second annunciator shows FLTR OUT in high frequency range.
2.2 TIME MEASUREMENT
2.2.1
Time (Seconds) Mode
Resolution:
Accuracy:
Range:
2.2.2
0.1 milliseconds
±0.5 milliseconds
0.0 ms- 9999sec, autoranging at the end of each decade
Time (Hertz) Mode
Resolution:
Accuracy:
Range:
0.1 Hz of frequency of Channel 1 input
±0.1 Hz of frequency of Channel 1 input
0.0 Hz- 9999Hz, Autoranging at 999.9 Hz
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SPECIFICATIONS
2.3
PHASE MEASUREMENT
Resolution:
Accuracy:
Range:
Speed:
Polarity:
2.4
0.1 deg
±0.5 deg down to 2 V I 200 rnA, reduced accuracy readings available to
below 1 V /100 rnA
24 db/octave digital input filters maintain rated accuracy for signals with high
harmonic content
0.0 to 360.0 degrees or ±180 degrees
Measurement speed is dependent on input frequency
For 60 Hz inputs:
2 readings/sec
7.5 readings/sec in START state
For 50 Hz inputs:
1.6 readings/sec
6.3 readings/sec in START state
Phase of channel1 (volts or amps) leads phase of channel2 (volts or amps).
VOLTAGE MEASUREMENT
Any combination of phase-to-phase or phase-to-ground voltages, selected by front panel colour
coded pushbuttons. Red or green LEOs indicate phase-to-phase or phase-to-ground status
respectively. True RMS, DC coupled. ABC/ACB phase rotation indicator LEOs included.
Accuracy:
Range:
Maximum input:
Input impedance:
Speed:
±0.4% of reading ±0.15% of scale
0-20/200/2000V, autoranging at 19.99, 199.9 V
Auto ranging always occurs on over-range.
Down-ranging occurs only if input level is below 9% of full scale of selected
range and AUTO RANGE is engaged.
600 VAC sustained input
2 megohms
3 readings/sec, 30 readings/sec in START state
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SPECIFICATIONS
2.5
CURRENT MEASUREMENT
Any phase value, or phase-to-phase vector, as selected by front panel colour coded pushbuttons.
Red or green LEOs indicate phase-to-phase or single phase status respectively. True RMS, AC
coupled via low-burden current transformers.
Accuracy:
Range:
Maximum input:
±0.4% of reading ±0.15% of scale
0 - 2/20/200 A, auto-ranging at 1.999, 19.99 A.
Auto ranging always occurs on over-range.
Down-ranging occurs only if input level is below 9% of full scale of selected
range and auto range is engaged.
75 amps sustained, ~50 amps for 5 seconds
Speed:
3 readings/sec, 30 readings/sec in START state
2.6
POWER MEASUREMENTS
Power measurements are calculated by the internal microprocessor from the current, voltage and
phase angle measurements.
2.6.1
Kilowatts
Resolution:
Accuracy:
Range:
2.6.2
Kilovars
Resolution:
Accuracy:
Range:
2.6.3
up to 0.001 kVAR
±0.8% of kVAR
-63.0 to +63.00 kVAR
Kilovoltamperes
Resolution:
Accuracy:
Range:
2.6.4
up to 0.001 kWatt
±0.8% ofVA
-63.0 to +63.0 kW
up to 0.001 kVA
±0.8% of kVA
0.0- 63.00 kVA
Power Factor
Resolution:
Accuracy:
Range:
0.001
±.004 of power factor
-1.000 to 1.000
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SPECIFICATIONS
2.7
EXTERNAL TRIGGER
•
•
•
•
•
•
•
2.8
POWER SUPPLY
•
•
•
2.9
Floating three terminal inputs for START and STOP triggers
Change of state detection for contact or AC/DC voltage (30-300V).
Contact inputs protected to 300V AC/DC
Input impedance 60 kohm minimum
Selectable audio tone for continuity indication on STOP
START trigger operation starts timer, increases update frequency of V, I, Phase, and
Frequency readings
STOP trigger stops timer, freezes all measurement readings
120 VAC/60 Hz version: Input range 100-130 VAC at 50-70Hz
240 VAC/50/60 Hz version: Input range 220-260 VAC at 47-70Hz
Internal 12VDC battery pack for 7 -hour operation plus automotive cigarette lighter plug
input.
RS-232C SERIAL COMMUNICATIONS PORT
Connector:
Data Format:
Speed:
Standard 25-pin female DB-25, DCE configuration
8 bits, no parity, 1 start bit, 1 stop bit
Standard rates from 110 to 9600 baud
•
Facilitates communication with printers, terminals, computers,and other RS-232C devices
• Permits automated output and recording of all measurements
• Permits control of all meter functions for fully automated or semi-automated testing
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SPECIFICATIONS
2.10
PHYSICAL CHARACTERISTICS
•
•
•
•
•
•
•
Aluminum case and frame
Moulded ABS plastic front/rear covers
Integrated carry handle/tilt stand
Large rear feet allow vertical operation
Size: 14" W x 6" H x 10.5" D (35.56 em W x 15.36 em H x 26.88 em D)
Weight: 15.8 lbs/7.2 kg (22.2 lbs/10.1 kg including battery)
Recessed voltage/contact input terminals accept shrouded safety plugs or standard
banana plugs. All on 3/4" centers.
• Current binding posts accept banana plugs, hook terminals or bare wires. All on 1 1/4"
centers
• Separate safety grounding post on rear panel
2.11
OPTIONS
•
•
•
•
•
•
•
•
•
01: Cordura carry case
Padded case with shoulder strap and pockets for leads and manuals.
02: Snap-on lead case
Attractive, Cordura case snaps onto the top of the meter to carry leads, cords
and accessories.
03: Impedance measurement.
Direct display of impedance, based on Z=V/1, Z=V/21, or Z=V/1.7321.
Replaces kVAR, kVA and P.F. display.
06: IEEE-488 interface
08: W, VAR, VA display
Replaces kW, kVAR, kVA display with W, VAR, VA readings. Only display
resolution is improved, not accuracy.
09: Ratio measurement
Replaces kVAR display with Channei1/Channel 2 ratio measurement. This
allows measurement of impedance (V/1), admittance (IN), voltage ratio (VN)
and current ratio (1/1). The VN and Ill measurements are useful for
measuring turns ratio and gain.
10: Slip frequency
Measures the difference in frequency between the Channel A & B inputs with
up to 0.001 Hz resolution. Useful for synchrocheck relay applications.
14: Synchrocheck
Provides an extra high speed phase measurement mode for checking phase
angle when testing synchrocheck and synchronizing relays. The maximum
reading speed is one reading per cycle, for 20 - 60 Hz inputs.
15: Wh measurement
Replaces kVA display with Wh measurement for testing watthour meters.
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SPECIFICATIONS
•
17: Signal processing
Adds three measurement capabilities;
1) Low pass filter for Channel A, inserts 5th order Low Pass filter in signal
path to attenuate signals above 60 Hz at 30 db/octave.
Eliminates all higher order harmonics from signal.
2) Average response AC measurement on Channel A. Useful alternative to
True RMS response, for such tests as second harmonic restraint and
current transformer excitation.
3) Peak responding measurement for Channels A and B. Captures and
holds positive or negative peak signal with 1 millisecond response time.
Can be calibrated for peak value or RMS equivalent. Extremely fast
response useful for transient tests such as inrush measurement.
• 18: Extended low level phase measurement
Extends 0.5 degree measurement accuracy for phase angle down to4.5% of
scale (0.9Vor 0.09A minimum).
• 20: Hard:-shell shipping case
• 21 : 1OV Triggers
Reduced trigger voltage threshold to 10V (Standard is 30V).
• 22: 0-20amp input
Replaces high current input capability with 20A for improved accuracy of current
measurement down to 20mA.
• 23: 240V, 50Hz Input
• 24: Extra Manual
• 25: 1 Year Extended Warranty
Additional year for a total of 2 years.
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SECTION 3
BASIC OPERATION
3.1
PRINCIPLE OF OPERATION
The MTS-1 030 Powermeter is a dual-channel voltmeter/ammeter integrated with start/stop trigger circuitry for performing timing measurements. The meter also measures frequency, phase,
kilowatts, kilovars, kilovoltamperes, and power factor from the dual voltage/current inputs.
3.1.1
Trigger States
The start and stop trigger inputs allow the meter to be operated in three different modes. These
modes are illustrated in the state diagram below:
I
I
L
------------------------------------------~
Figure 3-1. Trigger States
The MTS-1 030 begins in the READY state. Any start trigger will start the timer and switch all
measurements into the START or triggered state, in which measurements are updated at high
speeds. This START state is typically used for measurement during a simulated fault condition.
Any subsequent stop trigger will cause the STOP state to be entered. This will stop the timer
and freeze all readings at their current values. The stop trigger inputs are typically connected
to the relay contacts allowing the values of all parameters to be captured at the time of relay
pick-up. Operating the reset switch in any state will return the meter to the READY state and reMANTA TEST SYSTEMS
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BASIC OPERATION
set the timer.
Applications of Trigger States
3.1.2
The trigger states do more than facilitate timing measurement. They may be used in many
ways which enhance everyday measurement work. Typical applications of the trigger states
are listed below.
State
READY
START
STOP
3.2
Applications
Normal high-accuracy measurement
Data logging or monitoring
Measure/capture rapidly changing signals
Track signals during manual adjustment of some parameter (eg. voltage,
current, frequency, phase)
Timing measurement
Capture values of all measurements at the time of relay operation (ie. stop
trigger)
Freeze readings for manual or automatic recording
MAKING BASIC MEASUREMENTS
This section briefly describe how to make most basic measurements. For detailed information,
see section 4.
3.2.1
AC/DC Voltage Measurement
• Apply the signal to be measured to any two of the four VOLTAGE INPUT TERMINALS
as desired. Select V on the CHANNEL 1 IN SWITCH or CHANNEL 2 IN SWITCH as
applicable. Select the appropriate <P-IP or <t>-N combination with the PHASE SELECT
P/B's and <1>-<t>/<t>-N SWITCH to match the input connections.
• For stable, accurate measurements, set the range switch in the AUTO position.
3.2.2
AC Current Measurement
• Apply the current to be measured to the desired CURRENT INPUT TERMINAL. Select
<t>-N on the same channel's <t>-<t>/<t>-N SWITCH, and the appropriate phase on its PHASE
SELECT P/B's.
• Select I on the CHANNEL 1 IN SWITCH or CHANNEL 2 IN SWITCH as applicable.
• For stable, accurate measurements, engage the range switch in the AUTO position.
CHANNEL 1 and CHANNEL 2 can accept both a voltage and current simultaneously. This feature allows for the measurement of two voltages and two currents simultaneously.
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BASIC OPERATION
3.2.3
Frequency Measurement
• Apply the signal to be measured to the VOLTAGE INPUT TERMINALS or CURRENT
INPUT TERMINALS as appropriate and select V or I using the CHANNEL 1 IN SWITCH.
• Press the FREQ/KW pushbutton once or twice, as required, to display HZ in the FTP
DISPLAY.
• For stable, accurate measurements, engage the RANGE SWITCH in the AUTO position.
3.2.4
3.2.4.1
Phase Measurement
BASIC USAGE
• Apply the signals of interest to the current or voltage inputs. The meter will measure
the phase by which channel 1 leads 2.
• Select the desired signals on channels 1 and 2 using the IN SWITCHES and PHASE
SELECT P/B's.
• Press the PHASE/PF pushbutton once or twice, as required to display DEG in the FTP
DISPLAY.
• The reading is the angle by which the channel 1 signal leads the channel 2 signal.
• For stable, accurate measurements, engage the range switch in the AUTO position.
3.2.4.2 ±180° DISPLAY MODE. Phase angle can be displayed in ±180° mode. This may make
measurements near 0 degrees easier. It also displays phase to 0.01 deg~ee respJution fo~ angles
between -9.99 and -0.01 degrees. To display phase in 180° mode: When selecting phase to be
displayed, continue to press and hold the PHASE button for 3 seconds. The phase display will flip
to ±180° mode. To return to 0-360° mode, repeat the above steps.
3.2.4.3 LOW INPUT BLANKING. A blanking feature for phase readings when channel inputs
are too low to obtain meaningful phase readings. When either the channel 1 or channel 2 input
falls below 1% of scale, a small "o.o" is displayed as the phase reading. This is visibly different
from a display of "0.0", indicating in phase signal inputs.
Remember that rated 0.5 degree accuracy is only maintained for signal inputs between 10%
and 100% of scale. Reduced accuracy readings are obtainable for signal inputs between 1%
and 10% of scale (typically 1 to 5 degrees). Therefore, for accurate phase measurements, always engage the range switch in order to use the lowest possible scale.
3.2.5
3.2.5.1
Power Measurements
BASIC USAGE.
• Select voltage on channel 1 and current on channel 2 or vice versa.
• Select channel 1 to read the desired current or voltage using the CHANNEL 1 IN
SWITCH and select the opposite quantity on channel 2
• For KW measurement, press the FREQ/KW button once or twice, as required to display
KW in the FTP DISPLAY.
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• For reactive power, press the TIME (SEC)/KX button once or twice, required, to display
KX in the FTP DISPLAY.
• For apparent power, press th~ TIME (HZ)/KVA button once or twice, as required, to
display KVA in the FTP DISPLAY.
• For power factor, press the PHASE/PF button once or twice, as required, to display PF
in the FTP DISPLAY.
3.2.6
Timing Measurements
• Connect any signals to be measured to channel 1 and/or 2.
• Connect a start trigger signal to the START TRIGGER INPUTS.
• Connect a stop trigger signal to the STOP TRIGGER INPUTS.
• Press the reset switch to reset all timers and trigger circuit
• Vary the relay inputs (usually to a fault condition). This should cause a start trigger, and
a relay operation should generally cause a stop trigger.
• After the stop trigger all readings are frozen (including time in Hz or seconds) and may
be recalled on the FTP DISPLAY or channel 1 & 2 displays.
3.2.6.1 OVERCURRENT RELAY TIMING EXAMPLE. An example of timing measurement
with a simple overcurrent relay is illustrated here. The current to the relay is stepped from zero to
the fault \lalue using a switched output from the resistance load source. At the same time,-auxiliary
contact outputs on the source are closed, activating the start trigger on the meter. When the relay
operates, the contact closure causes a stop trigger, stopping the timers and freezing the current
reading at the time of operation.
-~--------------SYN-.~-HR-ON_lZE_DS_W_ITC_HE-DC-ON-rACT-.-S-------~
1U START TRIGGER CONTACT INPUTS
I
!
·.,\.._ RELAY CONTACTS
TO STOP TRIGGER
CONTACT INPtfl'S
Figure 3-2. Timing Measurement for Overcurrent Relays
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BASIC OPERATION
3.2.7
Measurements in 3-Phase Systems
Although basically a 2-channel meter, the MTS-1030 has built-in facilities for measurements in
3-phase systems. Any combination of c:t>-N and c:t>-c:t> voltage, current and power quantities can
be displayed using the phase select pushbuttons, c:t>-c:t>/c:t>-N select switches and IN switches.
For measurements of 3-phase power quantities, these should be computed from 2 or more
measurements. Typical measurements are:
C B A
Figure 3-3. Connections for 3-phase Measurements
For an unbalanced or balanced system:
3<P kW =kW(Va, Ia) + kW(Vb, lb) + kW(Vc, lc)
3<P kVA
3<P kVAR
=kVA(Va, Ia) + kVA(Vb, lb) + kVA(Vc, lc)
=kVAR(Va, Ia) + kVAR(Vb, lb) + kVAR(Vc, lc)
Power factor
3<PkW
= 3<P kVA
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For a balanced system:
3<P kW = kW (Vab, lab)= kW (Vbe, lbe) = kW (Vea, lea)
3<P kVAR = kVAR (Vab, lab)= kVAR (Vbe, lbe) = kVAR (Vea, lea)
3<P kVA = kVA (Vab, lab)= kVA (Vbe, lbe) =Power (Vea, lea)
Power factor= p. F. (Vab, lab) = p. F. (Vbe, lbe) = p. F. (Vea, lea)
For a system which has either balanced voltages or balanced currents, the 2-wattmeter method
can be used for kW, kVARs and kVA.
3<P kW = kW (Vab, Ia) + kW (Vcb, lc)
3<P kVAR = kVAR (Vab, Ia) + kVAR (Vcb, lc)
3<P kVA = kVA (Vab, Ia) + kVA (Vcb, lc)
P
Note:
-~'
t
ower ,ac or
=
Power (Vab, Ia) +Power (Vcb, fc)
kVA (Vab, Ia) + kVA (Vcb, lc)
To obtain Veb, select Vbe, then press the 8-C pushbutton again until the pushbutton
LED blinks.
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SECTION 4
DETAILED OPERATION
4.1
4.1.1
FRONT PANEL FEATURES
Front Panel Layout
0
0
Figure 4-1. Front Panel Layout
1.
2.
3.
4.
5.
6.
7.
CHANNEL 1 DISPLAY
CHANNEL 1 IN SWITCH
CHANNEL 1 PHASE SELECT P/B'S
CHANNEL 1 <j>-<j>-/<j>-N SWITCH
CHANNEL 2 DISPLAY
CHANNEL 2 IN SWITCH
CHANNEL 2 PHASE SELECT P/B'S
8. CHANNEL 2 <j>-<j>-/<j>-N SWITCH
9. VOLTAGE INPUT TERMINALS
10. VOLTAGE PHASE ROTATION LED'S
11. CURRENT INPUT TERMINALS
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
FTP DISPLAY
FTP DISPLAY SELECT P/B'S
ON/OFF SWITCH
MEASUREMENT SELECT SWITCH
AUTO/MANUAL RANGE SWITCH
START LED
STOP LED
RESET/TONE SELECT P/8
START TRIGGER TERMINALS
STOP TRIGGER TERMINALS
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DETAILED OPERATION
4.1.2
Channel 1 & 2 Displays [1 ,5]
These display current or voltage, as selected by the IN selector switches [2,6] for the channels.
An internal annunciator reads (m) AMPS or VOLTS as selected by the IN selector switch except
when under remote control of an external computer. The standard MTS-1030 will display AMPS
when current is selected. MTS-1 030's fitted with the optional low-current range will display mAMPS
when the input current is below 200 milliamperes. All current and voltage inputs may be connected
simultaneously and displayed as selected via the VII and phase select switches. However, in the
Stop State (STOP LED lit), only the quantity selected at moment of stop trigger is valid (see
Appendix A).
4.1.3
Channel 1 & 2 IN Switches [2,6]
These select current or voltage input to the channel for display, when the meter is in local control
mode.
4.1.4
Phase Select Pushbuttons [3,7]
These pushbuttons, in combination with the <D-<D/<D-N switches, allow rapid random selection of
any input voltage or current phasor for amplitude and phase measurement. They are particularly
useful in analyzing three phase systems. The switch selected at a given time will be the one of
the three in a channel which has an illuminated LED. The colour of the LED will indicate whether
a phase-to-phase (Red) or phase-to-ground (Green) value is selected. If the LED is flashing, rather
than steady, it indicates the 180°-reversed phasor has been selected. If the red LED on the middle
pushbutton of channel1 is flashing, for example, it indicates that the C to B phase current or voltage
phasor has been selected. By default, the first operation of a pushbutton will select the phasor
indicated on the panel graphics, such as 8 to C in the above example. To selectlhe inverted value
of that phasor, push the same pushbutton a second time. It is not necessary to always supply
three phase voltages and currents to the instrument, two unrelated single phase voltages could
be connected, A-8 for channel1 and C-N for channel2 for example. It is only necessary to ensure
the correct phase selection had been made, in this case A-B and C-N on channels 1 and 2
respectively.
4.1.5
cD-cD/<1>-N Select Switches [4,8]
As noted in the previous item, these switches select either phase to phase or phase to neutral
phasorsfor a channel. When measuring currents on a channel, <t>-N would normally be selected.
However , it is possible to measure the interphase vector of two currents by selecting <D-<D.
4.1.6
Channel1 & 2 Current Inputs [11]
These current inputs are AC coupled, unfused, low burden current transformer inputs. Maximum
continuous current input is limited by the rating of binding posts and 12 gauge internal wiring to 75
amperes. Short-term inputs in excess of 100 amperes are acceptable (the current rating of
externally connected devices in the current circuit are typically the limiting factor).
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4.1.7
Channel1 & 2 Voltage Inputs [9]
These inputs are DC coupled, 2 Mohm impedance, and internally fused. The internal fuses are
not user replaceable, as their failure may indicate an internal problem which must be rectified by
the factory. The maximum sustained input voltage is limited by input terminal ratings of 500Vrms
to ground. The maximum voltage between terminals must not exceed 600Vrms. Any combination
of single phase or three phase voltage (3(JJ,3W/3(JJ,4W) may be applied to the terminals.
CAUTION:
Whenever measuring voltages in excess of 250 VACrms/300 VDC the supplied
fused prods or equivalent must be used.
True RMS response ensures accurate measurement of distorted waveforms. The voltage DC
coupling allows measurement of DC voltages which are frequently encountered in relay systems.
4.1.8
Phase Rotation Indicator LEOs [1 0]
Whenever a balanced 3-phase 3-wire or 3-phase 4-wire voltage is applied to the voltage inputs in
the correct sequence (A, B, C, N as indicated on the panel graphics) one of the two indicator LEOs
will illuminate to indicate the phase sequence; green indicates ABC, red indicates ACB. The
indication will only be reliable for balanced three phase voltages. Single phase or seriously
unbalanced three phase inputs will cause erratic indications.
4.1.9
FTP Display [12]
This displays frequency, time, phase, or power quantities, as selected by the pushbuttons [13].
Annunciators show the function currently selected. After a stop trigger (STOP LED lit), each of
the measurements present at the moment of the trigger may be displayed by appropriate operation
()f the push buttons. Voltage and/or current inputs must have been present for a minimum amount
of time to obtain correct displayed values of frequency, phase and power (see Appendix A). N.B.
although it is possible to simultaneously connect all currents and voltages of a three phase system
to the meter, the power readings (kW, kVAR, and kVA) will be single phase values only, derived
from the current and voltage selected at the time. True three phase power may be derived from
these readings using standard metering techniques that would be employed with conventional
analog instruments. For example, three phase, three wire power is determined by use of the
formula:
Watts= (Vab x Ia)+ (Vcb x lc)
4.1.10
FTP Display Select Pushbuttons [13]
These are used to call up one of the eight functions on the FTP display either before or after a stop
trigger. They are disabled in remote control mode.
4.1.10.1 FREQUENCY. This button selects display of frequency of the current or voltage
present on the Channel 1 inputs. The standard range is 20.00 to 99.99 Hz allowing tests to be
made on low frequency telemetry systems, as well as power frequencies. The range is extended
to 500.0 Hz if rear panel DIP SWITCH #1 is closed prior to power up. The frequency multiplier
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DETAILED OPERATION
used to obtain the high resolution, requires a few seconds to reliably lock on the input frequency.
For accurate readings therefore ensure the signal is present long enough prior to a stop trigger.
Annunciator reads HZ.
4.1.10.2 KILOWATTS. Once frequency has been selected, the second operation of the frequency pushbutton will cause kilowatts derived from V and I inputs of Channel 1 and 2 to be
displayed. There must be a voltage and a current selected on channel 1 & 2 to obtain a reading.
Two currents or two voltages result in blanking of the display. Annunciator reads KW.
4.1.10.3 TIME SEC. This button selects time in seconds on the FTP display. Relay contact or
voltage signals to the START and STOP trigger inputs control the starting and stopping respectively, of the timer. The timer starts at 0.0 msec with autoranging up to lockout at 9999 seconds.
The annunciator reads mSEC or SEC.
4.1.10.4 KILOVARS. When time in seconds is selected, a second operation of the pushbutton
causes Kilovars derived from channels 1 and 2, V and I inputs to be displayed. The annunciator
reads KX. A current and a voltage must be selected to obtain a reading.
4.1.10.5 TIME HZ. This button selects time reading in cycles of the frequency present on
channel 1 inputs on the FTP display. As with frequency measurements, an input signal must be
present for a few seconds before starting a timing sequence, to allow locking of the frequency
multiplier. This timer function autoranges to 9999 Hz. The annunciator reads Hz.
4.1.10.6 KILOVOLTAMPERES. When time in Hz is selected, a second operation of the
pushbutton causes KVA derived from channel1 and 2 voltage and current inputs to be displayed.
The annunciator shows KVA. A current and a voltage must be selected to obtain a reading.
4.1.10.7 PHASE. This button selects phase angle on the FTP display. It is measured between
the selected AC signals on channels 1 and 2. The reading is in degrees, from 0.0 to 360.0, with
the channel 1 signal defined as leading channel 2 signal. The annunciator shows DEG.
A valid signal must be present a few seconds prior to freeze action, to obtain an accurate reading.
4.1.10.8 OBTAINING ACCURATE PHASE READINGS. Rated accuracy is only maintained for
signals in the 10%-1 00% range of the current or voltage inputs. Therefore if 0.5 deg accuracy is
required, ensure the RANGE switch is engaged to AUTO before recording the reading. A quick
accuracy check may be done by applying 120 VAC to both channels, and reversing polarity to one
channel. The reading should be 180.0°±0.5°. The same quantity applied in-phase to both channels
will usually give a reading of 360.0°, but since the reading rolls over to 0.0° at this point, any slight
fluctuation may be enough to cause a reading alternating between 0.0° and 360.0°.
Digital filters with a very steep cutoff at 1OOHz are used to virtually eliminate the effect of harmonics
on accuracy. This also allows shifting of the cutoff frequency for higher frequency measurements.
A byproduct of it's action is a small ripple in the output waveform which may cause some variation
in the least significant digit of the display, especially at low input levels.
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4.1.10.9 POWER FACTOR. When phase angle has been selected, a second operation of the
pushbutton causes power factor derived from channel 1 and 2 voltage and current inputs to be
displayed. The annunciator shows P.F.
4.1.11
On/Off Switch [14]
This switch turns on the instrument, when it is connected to mains power via the supplied power
cord, or is being run on battery power (optional).
4.1.12
Measurement Response Switch [15]
This switch allows meters fitted with the (optional) signal processing feature to select other than
the default True RMS measurement mode. Toggling the switch upwards will enable the Average
responding mode, ie AC measurements will display the average value of the signal, rather than
the true energy content as in TRMS mode. This is useful for tests requiring average response,
such as measuring second harmonic current using two ammeters for transformer relay harmonic
restraint tests. Average response works only with channel1, as indicated by the annunciator AVG
Ch1 which illuminates within channel 1 display. To disable the AVG mode, toggle the switch
upwards a second time, extinguishing the annunciator. The FILTER position of this switch is also
associated with the signal processing option. When toggled on, it illuminates the FLTR Ch1
annunciator in Channel 1, and activates a steep 5th order low pass filter (30 db/octave) on the
signal path of the channel. This can be used to eliminate all higher order harmonics from the 60
Hz fundamental signal. FILTER is disengaged by a second toggle of the switch. More information
on these 2 options is included in section 6-8.
4.1.13
Range AUTO/MAN Switch [16]
This switch enables or disables the automatic down-ranging of the meter. The lower AUTO[matic]
position enables auto down-ranging of channels 1 and/or 2 if the respective readings are less than
9% of the normal range at that time. Placing the switch in the upper MAN[ual] position disables
down-ranging, to permit rapid capture of currents or voltages which may be present only momentarily at the V or I inputs. More than one second is required for each auto up-range and subsequent
reading stabilization, which would make it impossible to record short duration signals if the meter
always returned to the most sensitive range on removal of the input signals. Blocking downranging
via the MAN position means the meter stays in the range currently in use. It can also mean however
that the level-sensitive frequency and phase circuits may not always be in their optimum range, so
where accuracy of these quantities are important, always engage the AUTO position before
recording the reading.
4.1.14
External Trigger Start Terminals [20]
These three input terminals allow external contacts or voltage signals to start the second and cycle
timers, and engage the high-speed mode of other circuitry. The left and center terminals detect
impedance change-of-state, such as contact closure or low-impedance voltage source appearance. The right and center terminals detect voltage change-of-state. In either case, the initial
appearance of a signal activates the START state, illuminating the START LED [17]. Once
triggered, operation of the RESET switch [19], turns off the START LED and arms the circuits to
detect the next change of state. This could be the disappearance of the signal, thus enabling
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<trigger~
action from contact opening/voltage disappearance, as well as the more conventional
contact closure/voltage appearance. The recommended mode is to use voltage sensing whenever
possible, since these terminals do not inject a voltage of their own into the circuit under test. The
voltage output from the impedance terminals, although of very high source impedance, may in
some cases be sufficient to alter observed operation time of sensitive electronic relays. Up to 300
VDC may be applied to any of the three terminals without damage. AC voltage should be avoided
due to the inherent poor accuracy caused by it's continuous reversals. Input impedance of either
pair is greater than 60kohms. Complete galvanic isolation is ensured by the use of optical ,coupling
and independent power supplies for the sensing circuits. The inputs are polarity sensitive, ,go if
expected action is not achieved, roll the input leads. In the START state, channels 1 and 2 begin
to update at 30 times/second rather than the normal 3 times/second. Independent AID converters
in each chc:mnel ensure accurate synchronizing of the displayed data. This system optimizes
speed, at the expense of only freezing one V or I reading per channel. The frequericy/time/phase/pciwer readings derived from channels 1 and 2 are processed simultaneously
by the internal microprocessor, and therefore may all be frozen and recalled. The update rate of
these readings are also increased by the START trigger.
4.1.15
Start LED [17]
When lit, indicates that the START state is active, and that the timers have been started and are
running. START state is cancelled by the RESET switch or by operation of a STOP trigger.
4.1.16
External Trigger Stop Terminals [21]
The sensing action, impedance characteristics, and floating status of these inputs are identical to
those of the START inputs described above. Activation is indicated by lighting of the STOP LED.
They control the STOP state, ie when the STOP LED is illuminated all displayed readings will be
frozen at the value they had at the moment of the STOP trigger, whether the normal or high-speed
modes were active at the time. The STOP trigger can also be overridden by the RESET/TONE
Switch [19]
4.1.16.1 TWO WIRE PULSE TIMING. By paralleling the START and STOP inputs, pulse type
operations may be timed using only a single pair of sensing leads. The rising edge of a voltage
pulse, for example would cause a start trigger, and the falling edge would cause a stop trigger.
This allows measurement of the duration of a voltage pulse.
MANTA TEST SYSTEMS
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MTS-1 030 OPERATION AND REFERENCE MANUAL
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DETAILED OPERATION
/
-Iii~ .~·~·-~ ~ ~
o I......
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-~':II
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·!;~ ID
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f
CONTACT OPEN-CLOSE-OPEN
OR CLOSE-OPEN-CLOSE INPUT
VOLTAGE PULSE INPUT
PARALLELED START & STOP INPUTS FOR TWO-WIRE TIMING
Figure 4-2. Two Wire Timing Setup
4.1.17
RESET [Tone Enable] Switch [19]
This internally illuminated pushbutton controls audible annunciation plus 'pick-up mode' and is
intended to facilitate detection of external relay operation. The tone action is enabled by
depressing the RESET pushbutton until a medium length 'beep' is heard. It is disabled by again
depressing the pushbutton until a shorter 'beep' is heard. For relay operation sensing, an output
contact of a relay under test or voltage controlled by same, are connected to the appropriate STOP
Trigger Inputs. Contact closure, or voltage appearance, will then be indicated by illumination of
the switch and by an audible tone if the tone is enabled. Enabling the tone also engages the
'pick-up mode'. During tests such as minimum pickup level for current relays, an operating signal
such as AC current will typically be passed several times through the operate point to check for
consistent operation. Normally each STOP operation would freeze the meter readings, necessitating continual manual resetting. Enabling the tone however defeats the freeze action ofthe STOP
trigger. 'Pick-up mode' without tone operation can be achieved by shorting the EXT RESET inputs
on the back panel. During conventional testing in which the STOP trigger freezing action is
enabled, the timer and all frozen readings are reset by briefly depressing the RESET button.
4.1.18
Stop LED [18]
When lit, indicates that the STOP state is active, all timers have been stopped and all readings are
frozen. To restore normal operation, press the RESET pushbutton.
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4-7
DETAILED OPERATION
REAR PANEL FEATURES
4.2
Rear Panel Layout
4.2.1
(
I
I
I
I(J
ol
MADE IN CANADA
\ -L--~--~----+-------~--+---~------~
4
I
I
~--"--·J
1. AC INPUT RECEPTACLE
2. FUSE HOLDER
3. FRAME GROUND POST
4. DIP SWITCHES
5. VERTICAL SUPPORT FOOT
6. RS-232 PORT CONNECTOR
7. 12V DC INPUT JACK
8. AUXILIARY I/0 PORT CONNECTOR
9. EXTERNAL RESET INPUTS
10. PRINT/BAUD RATE PUSHBUTTON
L_ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - '
Figure 4-3. Rear Panel Layout
4.2.2
External Reset Terminals
This pair of jacks located on the rear panel are intended to be connected to the [EXT RESET]
output terminals ofthe MTS-171 0, Universal Protective Relay Test System, allowing single-button
reset of both the MTS-1710 and the meter. However any external dry contact or opto-isolated
signal can be used for the same purpose.
CAUTION:
Do not apply a voltage signal to these terminals!
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DETAILED OPERATION
4.2.3
DIP Switches
4.2.3.1 DIP SWITCH #1. This switch is labelled FLTR, and controls the cutoff point ofthe digital
filters for phase angle and frequency measurement. If set to the top (closed) position prior to power
up of the meter, it selects the high frequency measurement mode, by raising the cutoff point of the
digitc;il filters above 500Hz. Simultaneously the frequency display shif~s it's decimal point to permit
a full range 500.0Hz reading and illuminates the FLTR OUT annunciator.
This will of course impair the accuracy of phase angle measurements whenever noise or harmonic
distortion are present, therefore use only for high frequency checks. Normal filter action is restored
by returning the switch to OPEN and turning the meter off, then back on.
4.2.3.2 DIP SWITCH #2. ·This switch is labelled R/L and configures the meter to process control
signals to the CV-3 via the AUX 110 connector.
4.2.3.3 DIP SWITCH #3. This switch enables the special printer mode, whereby a serial interface printer may be directly connected to the RS-232C port. (See section 5.5)
4.2.3.4 DIP SWITCH #4. This switch enables the high speed phase measurement when Option
14 Synchrocheck Option is fitted. (See section 6.5.2.1)
4.2.3.5 DIP SWITCH #5 This switch enables the PEAK RESPONSE feature when Option 17 is
fitted. (See section 6. 7 .2.3)
4.2.3.6 DIP SWITCHES #6-8.
programming.
4.2.4
These remaining switches are for options including IEEE-488
AUX 1/0 Connector
This rear panel connector is an auxiliary output allowing commands sent to the meter via an external
computer to be processed and sent via the connector to control a third device. Applications
available include digital control of the Manta Test Systems MTS-1200 3 channel AC/DC current/voltage source.
This port provides an 8 bit TTL level output. The connector pinout is given below. See section
5.3.2 for operation.
Pin#
1
2
3
4
5
6
7
8
Function
NC
NC
NC
+5V supply
Output bit 3
Output bit 2
Output bit 7
Output bit 0
Pin#
9
10
11
12
13
14
15
FynQtion
NC
NC
Ground
Output bit 4
Output bit 5
Output bit 6
Output bit 1
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DETAILED OPERATION
4.2.5
RS-232C Connector
This standard 25-pin female connector allows the meter to be connected to the serial port of an
external computer. Its use is covered in detail in section 5.
4.2.6
Print/Baud Rate Pushbutton
This rear panel pushbutton is used to program the baud rate of serial data transfer, by depressing
it during power-up and releasing when the desired baud rate is displayed on the FTP display.
Operation after power-up transmits a set of readings over the serial port.
4.2.7
IEEE-488 Connector
This connector is present for systems with the IEEE-488 interface option. The RS-232C port
remains fully functional with this option installed.
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SECTION 5
RS-232C INTERFACE
5.1 INTRODUCTION
The MTS-1030 Powermeter's RS-232C interface enables a remote system to perform the
following:
1.
Control all display selections
2.
Control the RESET and RANGE controls
3.
Interrogate and output all readings over the interface in a desired format
4.
Access the AUX 1/0 port to control another digitally controllable device
5.
Select high/low frequency scales
6.
Perform data acquisition
7.
Allow for semi and fully automated testing
The extensive output control capabilities of the meter allow for data logging applications. Measurement results can be directly input into personal computers or microcomputers, and processed
by users' application programs. Any combination of meter readings can be output in a tabular form,
separated by commas or spaces. All numbers are output in ASCII format. This allows data to be
directly input into BASIC programs or applications packages such as Lotus 1-2-3® or dBASE Ill®,
while remaining directly readable to the user. In addition, a special program mode can be selected,
which simplifies the processing that is done when the meter is under the control of an external
computer. As with the meter's hardware features, significant design effort has gone into software
to ensure maximum ease in setting up computer application programs.
The meter's full range of computer-accessible features make possible computer-aided testing
using only conventional test equipment. Relay operation sensing, and the associated freezing of
meter readings, allow an external computer to automate the documenting of test procedures. For
testing such as impedance relays, where many test point values must be recorded, processed,
and graphically analyzed, substantial productivity gains are possible. Computers from the wide
range of powerful, inexpensive PC-compatible notebooks coupled with commercial software as
above are!'Gin use with the meter now. Talk to your distributor for current information on computeraided testing using only the conventional equipment you now possess. Most of the information in
this section also pertains to the IEEE-488 interface.
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5-1
RS-232C INTERFACE
5.2 RS-232C CONNECTIONS
The RS-232C connector is a standard DB-25 female connector, wired as a DCE (Data Communications Equipment). Since many computers ignore the handshake signals, pins 2, 3 and 7 may
be the only lines that have to be connected to obtain a functional interface. Due to the potential
complexities involved, contact your computer dealer regarding cabling requirements for .your
specific computer, terminal or printer. The following data will assist you in setting up an operational
interface:
RS-232C CONNECTOR PIN ASSIGNMENTS
Pin Number
1
2
3
4
5
6
7
8
20
Data format:
Data speed:
Protocol:
Signal
Frame Ground
Transmit Data
Receive Data
Request to Send
Clear to Send
Data Set Ready
Signal Ground
Data Carrier Detect
Data Terminal Ready
Direction
NA
To MTS-1030 Powermeter
From MTS-1 030 Powermeter
To MTS-1030 Powermeter
From MTS-1030 Powermeter
From MTS-1 030 Powermeter
NA
From MTS-1 030 Powermeter
To MTS-1 030 Powermeter
8 bits + 1 stop bit + 1 start bit, no parity
10 user selectable standard baud rates: 110,300,600, 1200, 1800,2400,
3600,4800, 7200, and 9600 baud
The RS-232C output now has XON/XOFF capability to prevent data loss
when used with computers and devices with XON/XOFF capability. CONTROL-S (ASCII 19) and CONTROL-Q (ASCII 17) characters are used to
pause and resume data output from the MTS-1 030. These may be used
manually, if desired, to pause the display.
For those who are using Lotus Symphony® or Lotus 1-2-3® +Measure or PowerComm™ on the
IBM PC, enable outbound handshaking (XON/XOFF) in order to prevent data loss.
On power-up the meter assumes a data rate of9600 baud. To select a different baud rate, depress
and hold the Baud Rate pushbutton while turning on the meter. The available baud rates will be
sequentially displayed on the FTP display. Release the button when the desired rate is displayed.
The selected rate is retained as long as the meter is not turned off.
Once successful communication has been established, a message similar to the following will be
sent by the meter:
MTS-1 030 Powermeter
Serial #3.0, 00, 0895
Type HLP for help.
Ready>
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RS-232C INTERFACE
5.3
COMMAND DESCRIPTIONS
All functions are accessible via the RS-232C and the IEEE-488 interfaces. A simple 3 letter code
is used to select any particular function. For RS-232C interfaces, simply type this code followed
by the RETURN key, from the computer or terminal connected to the MTS-1 030 Powermeter. For
IEEE-488 interfaces, the code should be terminated by an EOI command. To see the list of
available commands, use the HLP (help) command. All commands may be typed in any
combination of upper and lower case, although key command letters are denoted here in upper
case for clarity.
The Drr, Prr, -rr, and +rr commands use common suffixes, denoted by 'rr'. Examples of valid
commands are: DFR, DPH, PPH, +KW and -FR. The valid suffixes and their meaning are given
in the following table:
FR
TS
TH
PH
KW
KX
VA
PF
C1
C2
5.3.1
frequency
time (seconds)
time (Hertz)
phase
average power
reactive power (kVAR)
apparent power (kVA)
power factor
channel1
channel2
Function Control Commands
REM
The REM command places the meter in remote control mode. This disables most
front panel controls, and enables control via the communications interface. This
mode is indicated by the 'REMOTE' annunciator on the channel 1 display. The
meter must be in remote mode in order to operate the following commands: RES,
RNG, RSL, RGL, C1V, C11, C2V, C21, DFR, DTS, DTH, DPH, DKW, DKX, OVA
and DPF. When remote mode is entered, the FTP display selection and channel 1
& 2 selections remain the same as previously selected.
LOC
The LOC command is the opposite of the REM command and places the meter in
local control mode. Front panel controls are re-enabled and the 'REMOTE' annunciator is turned off.
RES
The RES command resets the triggering logic. This provides the same function as
operating the Reset switch.
RNG
The RNG command resets the autorange circuit. This provides the same function
as momentarily operating the Range switch.
RSL
The RSL command latches the reset control in the on position. It has the same
effect as permanently engaging the reset switch, which disables the start and stop
triggers. The RES command may be used to release this control to the off position.
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5-3
RS-232C INTERFACE
Note that if RSL was executed and then the meter was returned to local control,
the reset control would still be in the ON mode, regardless of the front panel switch
position. The RES command is the only way to release the control to the off mode.
RGL
The RGL command latches the range control in the AUTO position, allowing
automatic downranging. The RNG command may be used to release this control
to the MAN position. Note that if RSL was executed, and then the meter was
returned to local control, the down range control would still be in the ON mode,
regardless of the front panel switch position. The RNG command should be to
release the control to the off mode.
C1V
Channel1 Voltage: Selects voltage for measurement/display on channel1.
C11
Channel 2 Current: Selects current for measurement/display on channel1.
C2V
Channel 2 Voltage: Selects voltage for measurement/display on channel 2.
C21
Ct)annel 2 Current: Selects current for measurement/display on channel 2.
LFS
The LFS command selects the low scale for frequency measurement (20 - 99.99
Hz). (NOTE: The LFS and HFS commands override the rear panel switch setting)
HFS
The HFS command selects the high scale for frequency measurement (0-500.0
Hz). This scale is indicated by the 'FLTRPUT' annunciator. The digital filter is not
actually taken out of the circuit in this mode, its cutoff frequency is simply raised to
approximately 500 Hz.
Orr
The Orr command selects reading denoted by 'rr' to be displayed on the FTP display.
(eg. OPH displays phase)
STR
Initiate internal start trigger: The external start trigger inputs must be de-asserted
(open contact/voltage absent) for this command to take effect.
STP
Initiate internal stop trigger: The external stop trigger inputs must be de-asserted
(open contact/voltage absent) for this command to take effect.
STS
Print Stop Trigger Status. Returns the status of the stop trigger input. This is used
to sense the presence of a closed contact or voltage on the external trigger inputs.
"ACTIVE" is returned if a closed contact or voltage is sensed.
"INACTIVE" is returned if neither of the above is sensed.
TON#
Tone On/Off: TON1 enables tone mode. The tone sounds when closed contact or
voltage presence detected on the external stop trigger inputs. In addition, the stop
trigger is locked out. This mode should be used for pickup checks.
TONO disables tone mode (Tone off and stop trigger enabled). This mode should
be used for timing checks.
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RS-232C INTERFACE
G1S#
Channel 1 Selection: Select <l>-N or <I>-<I> quantity to be measured/displayed
on channel1
Valid values: 0 - 5
0 -A-N
1- 8-N
2- C-N
3 -A-8
4- 8-C
5- C-A
C2S#
Channel 2 Selection: Select ct>-N or ct>-ct> quantity to be measured/displayed
on channel2
Valid values: 0 - 5
0 -A-N
1- 8-N
2- C-N
3 -A-8
4- 8-C
5- C-A
PHI#
Phase Invert: Controls inversion of inputs into channel 1 & 2 for phase measurement.
Valid values: 0 - 3
0 - No phase inversion (normal phase measured)
1 - Invert channel1
2 - Invert channel 2
3 - Invert channels 1 & 2
Display Phase: Selects phase angle on the LED display
DPH#
If no argument is specified, this command brings up phase angle reading on the
upper LED display
DPHO selects the 0 - 360° phase display mode. DPH 1 selects the 0 - 180° phase
display mode.
5.3.2
Auxiliary Port Control
The auxiliary port is special output port on the rear panel of the MTS-1030 Powermeter. It is used
for digital control of other related devices along with the meter, such as a programmable resistance
load. It is basically an 8 bit TTL level output channel. The outputs can be placed in a high
impedance state (referred to here as the 'off state). Control of this port is accessible via the
following two commands:
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RS-232C INTERFACE
AUX
AUX#
,The AUX command toggles the auxiliary port on and pff. After executed, the meter
will send the message 'Auxiliary port on' or 'Auxiliary port off, to inform the user or
computer of the new state. Below is a sample execution of the AUX command:
Ready >aux
Auxiliary port on
Ready>
Auxiliary port on/off
This is an extension of the AUX command. Instead of toggling the auxiliary port on
or off, this command allows directly turning the port on or off.
Valid values are 0 - 1.
0- Turn auxiliary port off (default)
1 - Turn auxiliary port on
The "Auxiliary port on" and "Auxiliary port off' messages are not sent by the
MTS-1030 when AUX1 or AUXO is used.
A###
The A### command sends the 8 bit code (given by to the auxiliary port. Any decimal
value from 0 to 255 is valid. For example, the command A67 sends the binary word
01000011 to the port. This code is only output if the port is in the 'on' state.
Note:
When Option 17 is fitted, Auxiliary port control is disabled. See section 6.7 for
details on Option 17.
5.3.3
Prr
Output Commands
The Prr commands print the current value of the reading specified by 'rr'. For
example, PPH prints the phase reading. The appropriate units are also printed if
the meter is in Terminal mode. Below is a sample execution of the Prr command:
Ready >pph
40.4 deg.
Ready >pfr
59.98 Hz
Ready>
HLP
The HLP command prints a summary list and description of all available commands.
REP
The REP command prints a formatted report of measurements, all trigger status.
Proper decimal point placement and units are maintained throughout. This command has the same function as pushing the rear panel Baud/Print pushbutton
during normal operation. The rear panel pushbutton is provided for convenience,
or applications in which only a printer is connected to the RS-232C port. Below is
a sample execution of the REP command:
Ready >rep
Report:
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RS-232C INTERFACE
Freq: 60.08 Hz
Time: 131.2 sec
Phase: 240.5deg
Power: -.5406kW
Ready>
STA
Chan. 1:0127V
Chan. 2:1.098A
Stat: Triggered
The STA command prints the current trigger status. The three possible responses
returned by the meter are "Ready", "Triggered" and "Stop". Below is a sample
execution of the STA command:
Ready >sta
Triggered
PSP
The PSP command causes the meter to print "Stop" on the next transition to stop
mode. Only the first transition to stop mode will cause "Stop" to be printed. The
command must be re-issued to detect further transitions.
This command may be used to sense relay operation if the relay contacts are
connected to the stop trigger inputs. When the relay contacts change state
(open/close) the stop trigger is activated, changing the meter trigger status to 'stop'.
If the PSP command had previously been sent, the meter will send "Stop" to the
host computer, informing it that the relay has operated and to proceed in the test.
LFT
The LFT command toggles the line feed option on and off. In the 'on' state, a line
feed code is sent at the end of every line output by the meter. So terminals and
printers require this code in order to print output on successive lines.
SER
The SER command toggles the suppressing of error messages on or off. The initial
value is off. When toggled on, error messages are not output over the RS-232C
interface. This command is intended for use in multidrop control configurations in
which two or more instruments are controlled via a single RS-232C port, (eg.
MTS-1030 and PS-3E).
CWO
The CWO command turns off the 50ms delay after each transmission of a return
(ASCII 13). This allows maximum RS-232C output rates to be achieved for high
speed data acquisition applications.
CW1
The CW1 command turns on the 50ms delay after each transmission of a carriage
return (ASCII 13). The meter defaults to this mode on power up. This delay
accommodates use of the meter with computers or devices with unbuffered
RS-232C interfaces or slow displays.
PPH#
Print Phase: Prints present phase reading
PPH prints the reading in 0- 360° mode. PPH 1 prints the reading in 0 - 180° mode.
PC1
Print Channel 1 reading: Prints the present channel 1 reading
PC2
Print Channel 2 reading: Prints the present channel 2 reading
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RS-232C INTERFACE
ERQ
Error message request: This command requests the MTS-1 030 to send the
description of the last encountered error.
LF1
Auto line feed on: This command enables automatic transmission of LF (line feed,
ASCII 10) characters after each CR character the MTS-1 030 sends.
This is the default setting.
LFO
5.3.4
Auto line feed off: This command disables automatic transmission of LF (line feed,
ASCII 10) characters after each CR character the MTS-1 030 sends.
Tabular Output
The TTL, TBL, -rr, +rr, DLS, and DLC commands control tabular output of readings. On power-up
the meter defaults to outputting all 10 measurements in the table. Selected measurements can
be deleted from the table using the -rr commands (eg. -KW to delete the kilowatts reading).
Selected readings can be added to the table using the +rr commands. However, the order in which
the readings appear, cannot be changed. A title line for the table can be output, using the TTL
command. The title line is aligned to the table of readings, and includes the appropriate units. The
TBL command prints out all of the selected readings on a single line separated by tabs. Comma
separators can be selected by using the DLC command. This feature is mainly for direct input into
applications programs.
5.3.4.1
EXAMPLE USAGE. The following is an example of a typical command
sequence using tabular output commands:
-PH
-KX
-TH
PGM
TTL
TBL
TBL
TBL
TBL
DLC
TBL
This sequence produces a labelled
table of seven columns by 4 rows,
for direct input into a spreadsheet
program.
The meter output resulting from this sequence is shown below:
Ready >-ph
Ready >-kx
Ready >-th
Ready >pgm
Freq.
[Hz]
60.01
60.00
Time
[sec.]
85.24
87.57
Power
[kW]
0.0
0.0
App Pwr
[kVA]
0.0
0.0
Power
Factor
0.0
0.0
Chan. 1
[Volts]
0128
0128
Chan.2
[Volts]
0.78
10.78
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RS-232C INTERFACE
60.00
59.99
59.99
89.78
98.12
103.6
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0128
0128
0128
0.82
10.80
10.79
The PGM command sets the program mode on, in order to suppress the prompt and user input.
The TRM command returns the meter to terminal mode. This mode is the default mode, and is
useful for simple tests and demonstrations of control capabilities. The TTL and TBL commands
produce a neat tabular output on the terminal.
Note that each reading is allocated eight columns in the output line, so that all ten measurements
can be displayed in one line on an eighty column screen. All output commands are available in
both local and remote control modes. ·
5.3.4.2
DESCRIPTION TABULAR OUTPUT COMMANDS.
TTL
The TTL command prints out a title line of all selected readings in ordered tabular
outputs. A second line of all relevant units is also printed.
TBL
The TBL command prints out all of the selected readings on a single line. The
readings are kept in close alignment to the title line if the TTL command was used.
The readings are always printed in the same order, independent of which readings
were chosen by the -rr and +rr commands.
This is a sample execution of the TTL and TBL commands:
Ready >ttl
Freq
Time
[Hz]
[sec.]
Ready >tbl
59.90
31.99
Time
[Hz]
Phase
[deg.]
Power
[kW]
Reac
Pwr
[kVAR]
App
Pw
[kVA]
Power
Factor
Chan 1
[Volts]
1924.
240.9
0.0
0.0
0.0
0.0
0128
-rr
The -rr commands delete the specified reading from tabular output. For example,
-TS deletes the time in seconds reading from the table.
+rr
The +rr commands add the specified reading to the table. For example, +PF adds
the power factor reading to the table.
DLS
The DLS command chooses a space as a delimiter for tabular output. A space is
then used to separate readings when the TBL command is executed.
DLC
The DLC command chooses a comma as a delimiter for tabular output. A comma
is then used to separate readings when the TBL command is executed. This feature
is useful when using BASIC's INPUT command to read a list of readings from the
meter. The BASIC language requires that numerical input be separated by commas
when using the INPUT command.
+C 1
Add Channel 1 reading to tabular output
+C2
Add Channel 2 reading to tabular output
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RS-232C INTERFACE
-C1
Remove Channel1 reading from tabular output
-C2
Remove Channel 2 reading from tabular output
5.3.5
Program/Terminal Modes
The meter can communicate in 2 conversational modes, Program mode or Terminal mode. The
mode is controlled by the following two commands:
PGM
The PGM command sets the meter in Program mode. This mode is used for direct
computer control of the meter. In this mode, characters sent to the meter as
commands are not echoed back to the terminal or computer. Communication on
the interface is effectively limited to one direction at a time. Also, the user prompt
is not sent, and units such as Hz and kW are not printed in response to Prr
commands. All of these features help to simplify applications programs.
TRM
The TRM command is the opposite of the PGM command and places the meter in
the user-friendly Terminal mode. This mode is used for simple tests, demonstrations, and very simple control applications.
5.4
5.4.1
COMMAND SUMMARY
Meter function control commands
Mnemonic
REM
LOC
RES
RNG
RSL
RGL
C1V
C2V
C11
C21
HFS
LFS
DFR
DTS
DTH
DPH
DKW
DKX
OVA
DPF
AUX
AUX#
A###
Meaning
Remarks
Remote
Take remote control
Local
Return control to front panel
Reset
Reset triggering logic
Range
Reset autorange circuitry
Reset latched
Latch reset control on
Range latched
Latch range control on (autorange)
Channel 1 Volts
Meter selection
Channel2 Volts
Meter selection
Channel 1 Amps
Meter selection
Channel 2 Amps
Meter selection
High frequency scale
Low frequency scale
Display Frequency
Front panel display selection
Display time (seconds)
Front panel display selection
Display time (Hertz)
Front panel display selection
Display phase
Front panel display selection
Display power (kilowatts)
Front panel display selection
Display power (kVar)
Front panel display selection
Display power (kVA)
Front panel display selection
Display power factor
Front panel display selection
Toggle auxiliary port on/off
Auxiliary port on/off
Send code ### to auxiliary port where ### is a number between 0 and 255
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RS-232C INTERFACE
5.4.2
Output related commands
Mnemonic
LFT
REP
PGM
TRM
TTL
TBL
+rr
-rr
DLS
DLC
Prr
STA
PSP
HLP
SER
CWO
CW1
ERQ
LF1
LFO
5.5
Meaning
Remarks
Line feed toggle
Toggle auto line feed ON/OFF
Report
Print report of readings
Program mode
Set Program mode
Terminal mode
Set Terminal mode
Title
Print title line of table
Table report
Print report of readings in tabular form
Add reading
Add a reading to the table (eg. +KW)
Delete reading
Delete a reading from the table (eg. -PF)
Oelimiter space
Set delimiter to a space
Delimiter comma
Set delimiter to a comma
Print reading
Print only one specified reading (eg. PFR)
Status
Print trigger status
Print stop trigger
Print "Stop" when STOP mode entered
Help
Print out a summary list of available commands
Suppress error
Suppress printing of error messages
CR wait off
Turn carriage return wait off
CR wait on
Turn carriage return wait on
Error message request
Auto line feed on
Auto line feed off
DEFAULTPARAMETERS
Due to the many operating modes and variables which are maintained by the meter, an external
computer may need to know the initial state of the meter after power-up. This is especially true
when the meter is used in applications requiring little or no human intervention. Therefore, the
following list of default parameters have been provided. This list gives the value of various
parameters which the meter assumes after power-up (software version 2.5 & up).
Control mode:
Trigger status:
Upper display:
Channel1:
Channel2:
Frequency scale:
Terminal mode:
Auto line feed:
Carriage return wait:
Error message output:
Baud rate:
Tabular output:
Tabular output delimiter:
Auxiliary port:
Auxiliary port data:
Local
Ready
Time in seconds
as per front panel switch
as per front panel switch
as per rear panel switch
On
On (line feed sent after each CR)
On
On
9600
All 10 readings output
space
off
0
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RS-232C INTERFACE
Note. when the special serial printer mode is selected, (via the rear p~n~l DIP.,~witch #3) the auto
line feed parameter default is off. In addition, extra long delays ·are placed after every character
and carriage return to accommodate slow printers.
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SECTION 6
MTS-1030 OPTIONS
6.1
OPTION -03 IMPEDANCE MEASUREMENT
With this option, the three,new parameters measured, designated Z1, Z2 and Z3, are calculated
based on the following formulae:
Z1= V/1
Z2= V/21
Z3= V/131
(ohms)
(ohms)
(ohms)
Where Vis the voltage reading, and I is the current reading.
Calculation of these quantities, is enabled as soon as one of the meter's channels is measuring
voltage and the other current.
6.1.1
Reading Accuracy
The accuracy of the Z1, Z2, and Z3 measurements depend almost entirely on the accuracy of the
voltage and current measurements. Therefore, a maximum of 4 digit precision can be obtained.
The accuracy of the calculation is 50% of the least significant digit. The accuracy of the channel
1 and 2 readings must be added to this to obtain the actual reading accuracy.
6.1.2
Front Panel Display
The standard display of secondary KX, KVA and P.F. quantities are substituted with Z1, Z2, and
Z3 respectively. The top LED display annunciators will read V/1, V/21, or V/131 when impedance
quantities are selected. The KX, KVA, and P.F. readings will no longer be displayable via front
panel selection; However, they may be displayed without annunciation of units on the upper LED
display by using the DKX, OVA, and DPF commands, via the RS-232C interface.
Division by zero conditions (current= O.OA) will be reported to the display by a series of dashes,
'----'. Values greater than 9999 ohms will also be reported the same way. The actual reading can
be obtained from the RS-232C interface. Values less then 1.000 ohm will show less than 4
significant digits on the LED display. However, all 4 significant digits can be obtained from the
RS-232C interface. Values less than 0.001 ohms will be displayed as 0.0.
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MTS-1030 OPTIONS
6.1.3
New RS-232C Commands
The following new RS-232C commands are an extension ofthe standard command set. Operation
of these commands are the same as the other Drr, Prr, +rr, and -rr commands, and should be
self-explanatory from an understanding of the standard set.
Mnemonic
DZ1
DZ2
DZ3
PZ1
PZ2
PZ3
+Z1
+Z2
+Z3
-Z1
-Z2
-Z3
Meaning
Display Z1 on upper LED display
Dispiay Z2 on upper LED display
Display Z3 on upper LED display
Print value of Z1
Print value of Z2
Print value of Z3
Add Z1 to tabular output
Add Z2 to tabular output
Add Z3 to tabular output
Remove Z1 from tabular output
Remove Z2 from tabular output
Remove Z3 from tabular output
Note that division by zero errors (current= O.OA) will be output as -9999 ohms when using these
comm~nds. This allows application programs which require numerical input, to detect this error
condition.
6.1.4
Tabular Output
After power-up the meter will default to printout the following readings in tabular output:
Freq.
Time
Time
Phase
Power
VII
V/21
V/--.!31
Chan. 1
Chan. 2
(Hz)
(sec.)
(Hz)
(deg.)
(kW)
(ohms)
(ohms)
(ohms)
(Volts) or (Amps)
(Volts) or (Amps)
The KX, VA and P.F. readings can be added to the table by using the standard +KX, +VA and +PF
commands.
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MTS-1 030 OPTIONS
6.2
6.2.1
MTS-1030 OPTION -04: 12VDC OPERATION/BATTERY
Description
The battery option allows the meter to be used in portable applications, where AC power is not
readily available. When fully charged, the pack gives approximately 7 hours of continuous
operation, or longer when used intermittently. The battery supply cord is terminated in a standard
cigarette lighter-style plug, allowing operation from the 12V system of most vehicles. Low battery
condition is indicated by an intermittent 'chirping' alarm. This feature is standard on units shipped
from 08/94, and is available free of charge to owners of older instruments through your Powertec
representative.
6.2.2
Option Contents
The 12V battery option includes the following:
Modified MTS-1 030 meter, with special power supply and 12V input jack
•
•
6.2.3
1 12-volt supply/adapter cable.
1 Battery pack (built-in).
Instructions for Use
When using a battery powered unit for the first time, charge it for a few hours before use, by
connecting AC power to the MTS-1 030.
For operation from an externai12V DC supply, connect the external supply via the supplied adapter
cable. The adapter cord is plugged in to the female socket of the battery pack and to the input
jack mounted on the plate of the IEEE-488 slot on the rear panel of the meter.
Whenever AC power is supplied to the MTS-1 030, the batteries will also be recharged.
CAUTION:
6.3
6.3.1
Fully discharging the batteries will significantly shorten their service life.
MTS-1030 OPTION -09: RATIO AlB MEASUREMENT OPTION
Operation
The second press of the TIME SEC. button will select the ratio NB measurement. This replaces
the kVAR reading on standard meters. The kVAR reading can still be interrogated or displayed by
using the PKX or DKX commands of the RS-232C interface.
By selecting the appropriate VII quantities on channels 1 and 2, four different quantities can be
measured, as shown below.
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MTS-1030 OPTIONS
Channel 1 Selection
Channel 2 Selection
AlB Quantity
Units
Volts
Amps
Impedance
ohms
Amps
Volts
Admittance
mhos
Volts
Volts
Voltage ratio
-
Amps
Amps
Current ratio
-
The VN and 1/1 measurements are useful for measuring transformer turns ratio and gain.
6.3.2
Specifications
Full 4 digit resolution, autoranging
0.0 to 9999
Overflow values are displayed as'----', but actual values may be read via
the RS-232C interface.
(1% + 0.2% of channel 1 scale+ 0.2% of channel 2 scale)
3 readings/sec, 30 readings/sec in START state
Resolution:
Range:
Accuracy:
Speed:
6.3.3
New RS-232C Commands
The following new RS-232C commands are available with this option:
ORA
PRA
-
Display ratio
displays ratio 1/2 on upper LED display
Print ratio
Print the current value of ratio 1/2
These commands are extensions of the Prr and Drr commands detailed in sections 5.3.1 and 5.3.3
of the manual.
6.4
6.4.1
MTS-1030 OPTION-10: FREQUENCY DIFFERENCE MEASUREMENT OPTION
Operation
To display frequency difference (f1-f2), select Watts, then press and hold the FREQ button for 3
seconds. The display will flip to f1-f2 and the HZ annunciator will flash to indicate this mode. To
return to channel 1 frequency display, repeat the above, while frequency difference is displayed.
The f1-f2 display will display both positive and negative differences in frequency between the
channel 1 & 2 inputs, with up to 0.001 Hz resolution. This is useful for synchrocheck relay testing
applications.
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MTS-1030 OPTIONS
6.4.2
Specifications
Resolution:
Range:
Accuracy
Speed:
6.4.3
up to 0.001 Hz, depending on sign and magnitude
-500 to +500Hz (high frequency scale)
-100 to +100Hz (low frequency scale)
±0.2 Hz (high frequency scale) or ±0.02 Hz (low frequency scale)
Measurement speed is dependent on Channel 1 & 2 input frequencies
For 60 Hz inputs:
1.5 readings/second
or 3.75 readings/sec in START state
New RS-232C Commands
The following new RS-232C commands are available with this option:
DFD
PFD
+FD
-FD
- display frequency difference
- selects f1-f2 for display on the upper LED display
- print frequency difference
- prints the current value of f1-f2
- add frequency difference to tabular output
- remove frequency difference from tabular output
These commands are extensions of the Orr, Prr, +rr, and -rr commands detailed in section 5.3 of
the manual.
6.4.4
Affects on Reading Speed
Frequency and phase measurement speeds may be up to 50% slower than the normal rate with
the f1 -'f2 measurement active. Triggering the meter into the START state will increase the reading
speed, as on regular meters.
If still higher speeds are required, disable the f1-f2 measurement by holding in the FREQ button
while turning on the ON/OFF switch. This disables the option, and allows for full frequency and
phase measurement speed, as on standard meters.
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MTS-1030 OPTIONS
6.5
MTS-1030 OPTION -14: SYNCHROCHECK OPTION
Introduction
6.5.1
The synchrocheck option provides an extra high speed phase measurement mode for checking
phase angle when testing synchrocheck and synchronizing relays. The maximum reading speed
obtainable is one reading per cycle, for 20 - 65 Hz inputs.
It is recommended that OPTION -10 (Frequency difference measurement) also be used in
conjunction with this option, as a perfect combination for testing synchrocheck and synchronizing
relays.
Operation
6.5.2
6.5.2.1
1.
2.
ENABLING/DISABLING THE SYNCHROCHECK OPTION.
To enable the high speed phase measurement:
(a)
Turn off the MTS-1 030.
(b)
Turn on (close) DIP switch #4 on the rear panel of the MTS-1 030.
(c)
Turn on the MTS-1030.
(d)
Press the PHASE pushbutton to display phase.
(e)
Apply an external start trigger to put the MTS-1 030 into high speed phase measurement
mode.
To disable the high speed phase measurement:
(a)
Turn off the MTS-1 030.
(b)
Turn off (open) DIP switch #4 on the rear panel of the MTS-1030.
(c)
Turn on the MTS-1 030. Phase measurement speeds will now be returned to normal as
on standard meters (For 60Hz inputs: 2 rdgs/sec in "Ready" mode, 7.5 rdgs/sec in
"Triggered" mode)
6.5.2.2 PHASE MEASUREMENT IN "READY" MODE. When neither the START or STOP
triggers have been activated, the MTS-1030 is in the "Ready" mode or state. In this mode, the
phase measurement speed is normal (For 60Hz inputs: 2 rdgs/sec).
6.5.2.3 FROZEN MEASUREMENT ON STOP TRIGGER. When an external STOP trigger is
sensed, the phase reading is frozen at the value measured in the last complete cycle.
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MTS-1030 OPTIONS
. 6.5.2.4 DUAL MODE PHASE DISPLAY. The 180° mode phase display can be enabled/disabled by selecting Power Factor, then pressing and holding the PHASE button for 3 seconds. This
is a standard MTS-1030 feature.
6.5.3
Specifications
The following specifications apply to the phase angle measurement when the synchrocheck option
is enabled (DIP switch #4 on) and the MTS-1030 is in the "Triggered" state (START LED on).
Recommended maximum
frequency difference (M):
0.5 Hz
(M= freq. difference between channel1 & 2 inputs)
25-65Hz
1 reading per cycle
Nominal input frequency (f) :
Nominal measurement speed:
The measurement error is a combination of a fixed absolute error, and an aperture error. The
aperture error is caused by the frequency difference between the channel 1 & 2 inputs. This error
is larger for MTS-1030's which have the frequency difference measurement active. To improve
the accuracy, disable the frequency difference measurement by holding in the FREQ pushbutton
while turning on the MTS-1 030.
1.
For MTS-1030 with frequency difference measurement enabled & installed:
Aperture error = ±( 1080 x
~f)
If degrees
Total error= ±(1080 x L\f) If± 0.7 degrees
2.
f[HZ]
~f[HZ]
Error [degrees]
60.0
0.05
±1.6
60.0
0.10
±2.5
60.0
0.25
±5.2
60.0
0.50
±9.7
For MTS-1030 with frequency difference measurement disabled or MTS-1030 without
frequency difference measurement option:
Aperture error = ±(360 x L\f) I f degrees
Total error= ±(360 x
~f)
If± 0.7 degrees
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MTS-1030 OPTIONS
f[HZ]
.M[HZ]
Error [degrees]
60.0
0.05
±1.0
60.0
0.10
±1.3
60.0
0.25
±2.2
60.0
0.50
±3.7
Use with the RS-232C PPH Command
6.5.4
The PPH command is used to interrogate the phase angle measurement via the RS-232C
interface. This command will always return the value that would be displayed in the upper LED
display. When the extra high speed measurement mode is active the PPH command returns the
high speed measured value. In the STOP state, the frozen value is returned. In the READY state,
the averaged value is returned.
Compatibility with Other Options
6.5.5
The synchrocheck option is fully compatible with other MTS-1030 options, such as frequency
difference measurement (Option -10) and ratio 1/2 measurement (Option -09). All of these options
can be installed with minimal effect on performance.
6.6
MTS-1030 OPTION -15: WATTHOURMEASUREMENT OPTION
6.6.1
Description
This option replaces the kVA reading on standard meters with a computed watthour measurement.
The kVA reading can still be interrogated or displayed by using the PVA or OVA commands of the
RS-232C interface.
6.6.2
Operation
6.6.2.1
MEASURING WATTHOURS.
•
Select Channel 1 voltage and Channel 2 current or vice versa. The second press of the
TIME HZ. button will select the watthour measurement on the upper display. If the
display is blank, this indicates that proper selections have not been made on channels
1 and 2.
• Provide a start trigger to begin the integrating watthour measurement.
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MTS-1030 OPTIONS
• At the end of the measurement period, provide a stop trigger to stop the watthour
measurement. The frozen watthour value is the measured energy between the start
and stop triggers.
6.6.2.2
LIMITATIONS.
• The measurement accuracy is limited by th~ 0.4% accuracy of current and voltage
measurements and the 0.5 degree accuracy of phase measurements. A best accuracy
of 1.5% can be expected. The watthour measurement is a computed value based on
the current, voltage and phase angle measurements, using 36ms integration steps.
• The range of displc:~yable values is +9999 Wh to -99,9 Wh, with a best resolution of 0.001
Wh. Overflow is indicated by"----" on the display.
• . If during the watthour measurement, the channel 1 or 2 IN selector switches are
changed, this disturbs the watthour measurement, and will invalidate the reading. When
this occurs, the watthour display will be blanked until the MTS-1 030 is reset back to the
READY state.
6.6.3
RS-232 Control
The following new RS-232 commands are available for use with this option.
The PWH command prints the present watthour value.
The DWH command selects watthours to be displayed on the upper display.
PWH
DWH
6.7
6.7.1
MTS-1030 OPTION -17: SIGNAL PROCESSING
Description
This option adds 3 capabilities to the standard MTS-1 030 meter.
1.
Low pass filter for Channel 1, inserts 5th order LP filter in signal path to attenuate signals
above 70 Hz at 30 db/octave. Eliminates all higher order harmonics from signal.
2.
Average response for AC measurements on Channel 1. Offers alternative to True RMS
response, for such tests as second harmonic restraint and current transformer excitation.
3.
Peak responding measurement for Channels 1 and 2. Captures and holds positive or
negative peak signal with 1 millisecond response time. Displayed reading can be calibrated
for either peak value or RMS equivalent of peak value. Extremely fast response useful for
transient tests such as inrush measurement.
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MTS-1 030 OPTIONS
Note:.
, This option is incompatible with meters fitted with any of the fqllowing options;
-06 IEEE-488 interface
-15 W.h measurement
6.7.2
Operation
6.7.2.1 LOW PASS FILTER. To engage this feature, select the MEASUREMENT SELECT
SWITCH to FILTER. This will illuminate the FLTR annunciator in Channel 1 display, and place the
steep cutoff filter directly in the currentfvoltage amplitude measurement p~th of Channel 1.
Channel 2 continues to perform unfiltered measurements, so it is possible to observe the effects
of the filtering action by supplying the same signal to both channels. Because the filter is by design
very frequency sensitive, it is recommended that the feature only be selected when this characteristic is desired, and the filter be switched off for normal measurements.
6.7.2.2 AVERAGE RESPONSE. To engage this feature, select the MEASUREMENT SELECT
SWITCH to AVG. This will illuminate the AVG Ch1 annunciator in Channel 2 display, and place
an average responding rather than True RMS responding circuit directly in the current/voltage
amplitude measurement path of Channel 1. Channel 2 continues to perform TRMS measurements, allgwing a si.gnal to be simultaneously measured both ways. It is recommended Jhat the
default TRMS measurement be left selected on Channel 1 except when Average response is
specificall,y required. TRMS response provides more accurate measurement of the energy content
of distorted signals.
6.7.2.3
PEAK RESPONSE. To engage this feature, select the PEAK switch of the rear panel
DIP switches to On. This will illuminate the PEAK annunciator in Channel 2 display, and place a
peak responding circuit directly in the current/voltage amplitude measurement path of both
Channels 1 and 2. This feature has an extremely fast response time, on the order of 1 millisecond,
to allow th~ capture of very fast transient signals such as inrush currents. The reading will capture
and hold the highest value of such transients. By default it is calibrated to display a reading equal
to the RMS value of a sine wave, assuming that the captured value is the peak value of that sine
wave. If desired, it can be recalibrated to display the actual peak value.
To ensure that very brief signals are captured correctly, it is necessary to ensure the meter is
selected to the correct range. This is done simply by applying a signal of the expected magnitude
to the meter with auto ranging selected to AUTO, which will automatically select t~e correct range,
and then selecting autoranging to MAN, which will lock it in that range, before the signal is removed.
See section 4.1.13 Auto/Man switch for further details of autoranging.
Once a signal has been captured, the operator should make note of the reading as soon as
possible. The reading slowly decreases over a period of several minutes. Once it has been
recorded, the reading can be reset by pushing the reset button.
Because of the high input impedance of the voltage measurement circuits and the rapid response
time of the peak reading feature, transient voltage measurements may show some variation
between tests due to switching noise. If this occurs, average several readings. Current measurements, because of their lower impedance, are less likely to be affected this way.
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MTS-1030 OPTIONS
Peak measurement should only be engaged when specifically required. It could cause operator
confusion when trying to measure varying signals.
6.8
6.8.1
MTS-1310 OPTION -18: EXTENDED LOW LEVEL PHASE MEASUREMENT
Description
This option improves the accuracy of phase angle measurements for very low input signal levels,
maintaining 0.5 degree accuracy down to 900 millivolts or 90 milliamps.
6.8.2
Operation
Operation is automatic, wherever the current or voltage input signals fall below 9% of full scale the
circuits engage to improve accuracy.
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6-11
SECTION 7
IEEE-488 INTERFACE
7.1
INTRODUCTION
The MTS-1 030 Powermeter has an optionaiiEEE-488 interface which complies with the IEEE-488
1978 Interface standard. The IEEE-488 (GPIB) interface for the MTS-1 030 allows control of the
MTS-1 030 from a suitable controller. The MTS-1 030 can be controlled, and interrogated for
readings using the same command set as for the RS-232C interface.
This addendum will only cover IEEE-488 details as they apply to the MTS-1 030 Powermeter. For
complete information on IEEE-488, we suggest that you refer to one or more of the following:
1.
488.1-1987 IEEE Standard Digital Interface for Programmable Instrumentation (ANSI),
available from the IEEE.
2.
Tutorial Description of the Hewlett-Packard Interface Bus, available from the Hewlett-Packard
Company.
3.
TMS9914A GPIB Controller User's Guide. Publication No. SPPU013, available from Texas
Instruments Incorporated.
7.2
IEEE-488 CONNECTOR PINOUT
Connection to the GPIB is made using the IEEE-488 connector on the rear panel.
Pin connections
Pin #
Signal
1
2
3
4
5
6
7
8
9
0101
0102
0103
0104
10
11
12
EOI
OAV
NRFD
NDAC
IFC
SRQ
ATN
Shield (OV)
Pin #
13
14
15
16
17
18
19
20
21
22
23
24
Signal
DI05
DI06
DI07
DI08
REN
OV(GNO)
OV(GND)
OV(GND)
OV(GND)
OV(GND)
OV(GND)
OV(GND)
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IEEE-488 INTERFACE
7.3
IEEE-488 Address DIP Switch
The IEEE-488 address must be set on the rear panel DIP switch of the MTS-1 030 prior to turning
the instrument on. The bit assignments for the address are shown in the following diagram:
Address
16 8 4 2 1
'l I I
I I
Note: Open position o.ssigns o. 1 to
the corresponding o.ddress bit.
Vo.lid o.Cidresses o.re froM 0 to 30.
OF' EN
Figure 7-1
7.4
IEEE-488 SUB-SET IMPLEMENTATION
The following sub-sets of the IEEE-488 Standard are implemented by the MTS-1030 Powermeter.
SH 1
AH 1
T6
TEO
L4
LEO
SR 1
RL 1
DC 1
PPO
DTO
E2
CO
7.5
Source Handshake
Acceptor Handshake
Basic Talker, serial poll, unaddressed if MLA
Extended Taiker, no capability
Basic Listener, Unaddressed if MTA
Extended Listener, no capability
Service Request
Remote/Local
Device Clear
Parallel Poll, no capability
Device Trigger, no capability
Tristate drivers
Not a controller
INTERFACE COMMANDS AND MTS-1030 SPECIFIC COMMANDS
Use of the IEEE-488 interface for the MTS-1030 involves both interface commands (commands
used to manage the interface) and MTS-1 030 specific commands (commands understood only by
the MTS-1030, for purposes of controlling it).
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IEEE-488 INTERFACE
Interface Commands
7.5.1
Interface commands are sent by the controller to manage the interface. The following table shows
the interface commands which are applicable to controlling the MTS-1030.
Summary of IEEE-488 Interface Commands
Mnemonic
Type*
Command
Description
ATN
u
Attention
Indicates interface message.
DCL
M
Device Clear
Sets all device to initial state.
END
u
End
Indicates end of message.
GTL
A
Go to local
Resumes front panel operation/control.
IFC
u
Interface Clear
Terminates all bus activity. Reset the
interface.
MLA
L
My Listen Address
Indicates next listener. Returns talk to idle.
MTA
L
My Talk Address
Indicates next talker. Returns listener to
idle.
REN
u
Remote Enable
Enables control of devices via the bus.
soc
A
Selected Device
Clear
Resets selected instrument to initial state.
SPD
M
Serial Poll Disable
Disables a serial poll.
SPE
M
Serial Poll Enable
Enables a serial poll.
SQR
u
Service Request
Informs controller of a request for service.
UNL
M
Unlisten
All devices stop receiving data
UNT
M
Untale
Current talker stops sending data.
*Type:
U:
L:
M:
A:
Uni-line command. Asserts a single bus management line
Local command refers to controller only
Multi-line command
Addressed command
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IEEE-488 INTERFACE
7.5.2
MTS-1030 Specific Commands
The MTS-1030 specific commands are used to control or interrogate the MTS-1030. These are
the same commands as used by the RS-232 interface (described in section 5), plus some additional
commands as described in section 7.6.9.
7.6
MTS-1030 IEEE-488 PROGRAMMING
This section provides specific informption on programming the MTS-1030 via the IEEE-488
interface.
7.6.1
Annunciators
Three annunciators on the MTS-1030 indicate its IEEE-488 addressed status. When the MTS1030 is under IEEE-488 remote control (REN asserted), the ''REMOTE" annunciator in the channel
1 display will be activated. When the MTS-1030 is addressed to listen, the "LISTEN" annunciator
in the channel2 display will be activated. When the MTS-1030 is addressed to talk, the "TALK"
annunciator in the channel 2 display will be activated.
7.6.2
Sending Commands to the MTS-1030
The same command set as used for the RS-232C interface is used by the IEEE-488 interface.
Commands should be terminated by a carriage return (ASCII 13) character, or an END signal.
Terminating a command with both a CR and END is also acceptable. An END signal is given by
asserting the EOI (End or Identify) command line in conjunction with the last byte in the message.
7.6.3
Receiving Data from the MTS-1030
The MTS-1 030 sends data in ASCII format, (identical to the RS-232C interface). Each reply line
is terminated by a CR (ASCII 13) plus an optional LF character (ASCII 10). Each reply message
can also be terminated by a programmable sequence (via the ODL# command). Whenever a new
command is sent to the MTS-1 030, any unread output that a previous command may have
generated will be discarded.
MTS-1030 commands which reply with multiple lines of data, such as REP or HLP, are also
available using the IEEE-488 interface. Each line is terminated by an CR plus an optional LF
character. The entire message may be terminated by any combination of an ETX character and
an END command (as specified by the ODL# command).
7.6.4
Examples
Example 1:
The following example initializes the interface, puts the MTS-1030 into remote
control mode, selects desired channels and displays on the MTS-1030, and
interrogates several readings.
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IEEE-488 INTERFACE
Note:
This example assumes that the controller has a device address of 21, and the
MTS-1030 has a device address of 15.
<CR>indicates a carriage return (ASCII 13) character.
(END) indicated the IEEE-488 bus END signal.
The IEEE-488 commands and MP-10/3 commands are sent by the controller.
IEEE-488
Command
IFC
REN
UNT
UNL
MTA21
MLA 15
MTS-1030
Command
MTS-1~30
Response
LFO<CR>
C1V<CR>
C21<CR>
DPH<CR>
PGM<CR>
PPH<CR>
MLA21
MTA 15
102.5<CR>
MTA21
MLA 15
ODL2<CR>
PC1<CR>
MLA21
MTA 15
68.4<CR>(END)
UNT
UNL
Comment
Clear the interface
Enable remote control
Turn off all talkers
Turn off alll.isteners
Setup controller as talker
Setup MTS-1 030 as listener
Turn auto linefeed off
Select channel 1 voltage
Select channel 2 current
Select phase display
Print values without units
Print phase
Setl!p controller as listener
Setup MTS:..1 030 as talker
Phase reading from MTS-1030
Setup controller as talker
Setup MTS-:1930 as .listener
Configure MTS-1 030 to send
(END) signal after message
Print channel 1 reading
Setup controller as listener
Setup MTS-1030 as talker
Channel 1 reading
Turn off all talkers
Turn off all listeners
Example 2:
The following example initializes the interface, puts the MTS-1030 into remote
control mode, and interrogates the MTS-1 030 twice for all readings except the time
in Hz and kVAR readings.
IEEE-488
Command
IFC
REN
UNT
UNL
MTA21
MLA 15
MTS-1030
Command
LFO<CR>
-TH<CR>
MTS-1 030 Response
Comment
Clear the interface
Enable remote control
Turn off all talkers
Turn off all listeners
Setup controller as talker
Setup MTS-1 030 as listener
Turn auto linefeed off
Omit time in Hz reading from table
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IEEE-488 INTERFACE
-KX<CR>
DLC<CR>
TTL<CR>
MLA21
MTA 15
MTA21
MLA 15
TBL<CR>
MLA21
MTA 15
MTA21
MLA 15
TBL<CR>
MLA21
MTA 15
UNT
UNL
7.6.5
Omit kVar reading
Put commas between tabular values
Print table title lines
Setup controller as listener
Setup MTS-1 030 as talker
Freq. Time Phase Power App.Pwr Power Chsm. 1 Chan. 2<CR>
[Hz] [sec] [deg] [kWJ [kVA] Factor [Volts] [Volts]<CR><CR>
Setup controller as talker
Setup MTS-1 030 as listener
Print tabular readings
Setup controller as listener
Setup MTS-1030 as talker
60.00, 5.677, 120.0, 0.0, 0.0, -.500, 70.0, 82.3<CR>
Setup controller as talker
Setup MTS-1 030 as listener
Print tabular readings
Setup controller as listener
Setup MTS-1030 as talker
60.00, 7.023, 120.1, 0.0, 0.0, -.5015, 69.9, 82.3<CR>
Turn off all talkers
Turn off all listeners
Service Request
A service request can be generated by the MTS-1 030 under three conditions (the occurrence of
a .start trigger, stop trigger or an error). The MTS-1030 can be configured to cause a service
request under one or more of these events using the SRQ# command. When an SRQ has been
sent, the controller can request the status of the MTS-1 030 using a serial poll.
7.6.6
Serial Polling
All devices capable of generating an SRQ contain a status register which holds information on the
current status of the device. The device status register is read by the controller during a serial poll
to determine which device is requesting service, and the type of service required. The status
register on the 7150 contains eight bits and is used as the serial poll byte. The contents of the
register is shown below:
8
7
6
5
4
3
2
1 <- DIO lines
7
6
5
4
3
2
1
0 <- Register bits
Io I I I I I I I I
Bit 7:
Bit 6:
Bit 5:
Always zero
1 MTS-1030 requesting service
0 = MTS-1 030 not requesting service
1 = MTS-1 030 in remote control
0 MTS-1 030 in local control
=
=
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IEEE-4881NTERFACE
Bit 4:
Bit 3:
Bit 2:
Bits1 ,0
0 = Channel 2 voltage selected
1 = Channel 2 current selected
0 = Channel 1 voltage selected
1 = Channel 1 current selected
0 =No error
1 =An error has occurred
0,0 =Trigger status= Ready
0,1 =Trigger status= Stop
1 ,0 Trigger status Triggered
=
7.6.7
=
Device Clear Function
The IEEE-488 device clear command (DCL) will set the MTS-1030 status as follows:
Channel 1 set to voltage
Channel 2 set to voltage
Trigger status set to ready (timer reset)
Auxiliary port state set to off
Auxiliary port data = 0
Frequency scale set to low
Table data delimiter= space
Disable service request (SRQ) functions
Output delimiter set to CR only
Auto linefeed after CR enabled
The MTS-1030 also supports the selected device clear command (SOC).
7.6.8
Modified Operation of RS-232 Commands
The use of the following commands from the IEEE-488 interface differ from the RS-232 interface.
Command
Description
REM
Remote Control
This command cannot be used on the IEEE-488 interface. Use the IEEE-488 REN
command instead.
LOC
Local Control
This command cannot be used on the IEEE-488 interface. Use the IEEE-488 GTL
command instead.
TRM
Terminal Mode
Enable printing units after Prr (print reading) commands. For example, PCA will
return "120.1 V" instead of just "120.1" if terminal mode is set on.
Note that the other features of the MTS-1030 "Terminal mode" is not applicable to
the IEEE-488 interface. The MTS-1 030 will not echo characters sent by the
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IEEE-488 INTERFACE
controller, nor will it send a 11 Readyn prompt.
PGM
Program Mode
Disable printing of units after Prr (print reading) commands.
7.6.9
New Commands
In order to simplify programming via the IEEE-488 interface, the following new commands have
been added. Note that these commands can also be sent via the RS-232 interface. Note that
SRQ# and ODL# commands are specifically for the IEEE-488 option.
Command
Description
SRQ#
Service request configuration
This command configures the MTS-1 030 to generate a service request when a
certain condition(s) occurs.
The MTS-1030 can be configured to generate a service request on a start trigger,
stop trigger, or an error.
Valid values are 0-7
Service Request on:
Start Trigger
Error
Disabled
Disabled
Disabled
Disabled
Enabled
Disabled
Disabled
Enabled
Enabled
Disabled
Enabled
Disabled
Enabled
Enabled
Enabled
Enabled
Value
0
1
2
3
4
5
6
7
AUX#
Stop Trigger
Disabled
Enabled
Disabled
Enabled
Disabled
Enabl.ed
Disabled
Enabled
Auxiliary port on/off
This is an extension of the AUX command. Instead of toggling the auxiliary port on
or off, this command allows directly turning the port on or off.
Valid values are 0 - 1.
0- Turn auxiliary port off (default)
1 - Turn auxiliary port on
The "Auxiliary port onn and ~~Auxiliary port off' messages are not sent by the
MTS-1030 when AUX1 or AUXO is used.
LF1
Auto line feed on
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IEEE-488 INTERFACE
This command enables automatic transmission of LF (line feed, ASCII 10) characters after each CR character the MTS-1 030 sends.
This is the default setting
LFO
Auto line feed off
This command disables automatic transmission of LF (line feed, ASCII 10) characters after each CR character the MTS-1030 sends.
ODL#
Output delimiter configuration
This command specifies how the MTS-1 030 will terminate messages which it
transmits on the bus.
Valid values are 0 - 3
0- messages are terminated
1 - messages are terminated
2 - messages are terminated
3 - messages are terminated
by a CR (default)
by CR, ETX
by CR, (END)
by CR, ETX, (END)
Examples:
Set the output delimiter to CR only:
ODLO
LFO
Set the output delimiter to CR, LF, (END)
.QQ.!.2
l..F1
Example:
The following example initializes the interface, puts the MTS-1030 into remote
control mode, configures the MTS-1 030 to initiate a service request when a stop
trigger has been sensed. When the service request occurs, the controller performs
a serial poll to read the status of the MTS-1030, then interrogates the time reading
and resets the meter.
IEEE-488
Command
IFC
REN
UNT
UNL
MTA21
MLA 15
MTS-1030
Command
SRQ1<CR>
ATN
SPE
MTS-1030 Response
Comment
Clear the interface
Enable remote control
Turn off all talkers
Turn off all listeners
Setup controller as talker
Setup MTS-'1 030 as listener
Enable SRQ on stop trigger
Here the controller waits until a
service request occurs
When service request occurs
take control of the bus
Send serial poll enable
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IEEE-488 INTERFACE
MTA 15
MLA 21
97
SPD
MTA 21
MLA 15
PTS<CR>
MLA21
MTA 15
3.902 sec.<CR>
MTA 21
MLA 15
RES<CR>
UNT
UNL
7.7
Setup MTS-1 030 as talker
Setup controller to listen
MTS-1 030's serial poll status byte
End serial poll
Setup controller as talker
Setup MTS-1 030 as listener
Print time in seconds command
Setup controller as listener
Setup MTS-1 030 as talker
Timer reading response
Setup controller as talker
Setup MTS-"1 030 as listener
Reset MTS-1 030 trigger status
Turn off all talkers
Turn off all listeners
SIMULTANEOUS USE OF IEEE-488 AND RS-232C INTERFACES
The IEEE-488 and RS-232C interfaces on the MTS-1030 can be used simultaneously. The
IEEE-488 interface is assigned priority over the RS-232. If the RS-232 has remote control, it may
be taken away by the IEEE-488 controller.
While the IEEE-488 interface has remote control, the RS-232 host cannot take away control using
the REM or LOG commands. In addition, the RS-232 interface is limited to using only non-remote
control commands, such as interrogation commands. Remote control commands such as C1V,
C11, RES, can only be executed by the controlling interface. An error message will be returned to
the RS-232 host if it attempts to use remote control commands while the IEEE-488 controller has
remote control.
The input and output buffers for the two interfaces are completely independent, therefore no
interaction between the two will occur.
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Powerscope is a graphical demonstration and teaching aid for use with the MTS-1030 as well as
other Powertec products.
8.1
FEATURES
• "Real-time", single window display for voltage & current output phasors
• Multi-window mode display showing symmetrical components and apparent impedance
for distance relay elements.
• Display of relay mho characteristic on the apparent impedance display
• Direct display of 3-phase power
• Direct display of unbalance
• Delta or wye display modes
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POWERSCOPE
VA
VB
VC
lA
IB
IC
50.49V 343.5°
Zag
50.49U 256°
Zbg
69.27V 1.20o
Zcg
6.1.6A 332°
Z.ab
6 . 1.6A 1.52 °
Zbc
4.4l.A 1.08°
zc:.a
IMPEDANCE
8.2Q l.l..5o
8.2Q 1.04.0°
1.5.7Q 1.2.0°
5.7n 57.so
26.0Q 83;9°
J.J..3n 4.3°
kVA: 0.93
kW: 0.53
VAR: 0.43
PF: 0.570
.cG
lA
VB
VOLTAGE COMPONENTS
VaO: l..2V -65.0°
Val.: S5.4V -0.1. 0
Va2: l.5.J.V -J.
90
CURRENT COMPONENTS
laO: J..5A 1.08.0°
Ial.: 4.7A -45.0°
l.a2: 2.7A -20.6°
Val.
I.al
Unbalance: 27.2X
Setup Screen
[ESC1
=
P
= Print
[CRSR UP1
= ZooM
In
[CRSR DOWNl
= ZooM
Out
Figure 8-1
8.1.1
Operation Instructions
1.
Connect the MTS-1030 port to your PC's RS-232 port with a standard serial cable. Turn on
the MTS-1 030.
2.
Start the program (PWRSCOPE).
8.2
PARAMETERS
The following parameters may be input/modified through the menu. On startup the program
automatically loads the last saved values.
EQUIPMENT: Specify powerscope is to be used with an MTS-1030.
COMM PORT: Select which comm port on the computer is to be used. Serial ports 1 to 4 can be
used. Powerscope is configured to use IRQ 4 for comm port 3 and IRQ 3 for Comm port 4. If your
computer uses different interrupts then you may have to reconfigure your computer to work with
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Powerscope (this applies to comm 3 and 4 only).
BAUD RATE: Select the baud rate used to communicate with the MTS-1030. This sets the baud
rate of the computer only. The baud rate of the equipment must be set manually. Refer to your
manual to change it if necessary.
WINDOW MODE: The multi-window mode enables the symmetrical components windows and
impedance window if available.
COLOR OR MONOCHROME: Specify whether the display is to be in color or monochrome.
Note:
If color is selected while using a monochrome display then some of the display may
not appear on the screen.
IMPEDANCE OF ENTIRE LINE: The impedance of the entire protected line in secondary ohms.
RELAY Z1, Z3, Z3 & Z3-REVERSE REACH: The reach of Zone 1, 2, 3 and Zone 3 reverse reach
elements expressed as a percentage of the line length.
RELAY MTA: The maximum torque angle of the relay in degrees.
RELAY CHARACTERISTIC OFFSET REACH: This is the magnitude of any offset of the relay
characteristic in secondary ohms.
RELAY CHARACTERISTIC OFFSET ANGLE:
characteristic in degrees.
This is the angle of any offset of the relay
RELAY CHARACTERISTIC ASPECT RATIO: This specifies the aspect ratio of the mho characteristic. Specify 1 for a circular characteristic, or a value less than 1 for lenticular characteristics.
ZERO SEQUENCE COMPENSATION FACTOR MAGNITUDE: This is the magnitude of the
k-factor for ground elements.
ZERO SEQUENCE COMPENSATION FACTOR ANGLE: This is the angle of the k-factor for
ground elements, in degrees. Specify 0 degrees for homogenous systems.
DELTA OR WYE DISPLAY MODE FOR SYMMETRICAL COMPONENTS PHASORS: This
specifies whether the symmetrical component phasors should be displayed in delta or wye mode.
DELTA OR WYE DISPLAY MODE FOR ACTUAL PHASORS: This specifies whether the actual
phasors should be displayed in delta or wye mode.
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POWERSCOPE
8.3
ACTUAL WINDOW
This shows the phasors measured by the MTS-1030. The 3 phase power quantities (kW, kVAR,
kVA and PF) are also displayed. Note that these are 3-phase power values as opposed to the
single phase power values displayed on the MTS-1 030 using the power display modes. Currents
are displayed at 10 times the scale of the voltages.
8.4
8.4.1
SYMMETRICAL COMPONENTS
Current Co""!ponents Window
This window displays the current symmetrical components:
laO, lbO, leO:
la1, lb1, lc1:
la2, lb2, lc2:
zero sequence current
positive sequence current
negative sequence current
Although all components appear on the display, only laO, la1 and la2 are labelled. Unbalance (the
ratio of negative to positive sequence current) is also displayed.
8.4.2
Voltage Components Window
This window displays the voltage symmetrical components:
VaO, VbO, VcO:
Va1, Vb1, Vc1:
Va2, Vb2, Vc2:
zero sequence voltage
positive sequence voltage
negative sequence voltage
Although all components appear on the display, only VaO, Va1 and Va2 are labelled. Unbalance
(the ratio of negative to positive sequence voltage) is also displayed.
It is usually better to display the symmetrical components in delta mode since the positive and
negative sequence components each consist of 3 phasors which often overlap each other.
8.4.3
Interpretation of Symmetrical Components Displays
The dynamic display of symmetrical components allows for very easy demonstration of the basic
concepts of symmetrical components.
1.
A normal balanced 3<P system will have no negative sequence or zero sequence components.
Also, symmetrical 3<P faults will have no negative sequence or zero sequence components.
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2.
Any unsymmetrical faults involving ground (<P-G, 2<P-G) will produce zero sequence components (current and voltage). The residual current is 3 times the zero sequence current (laO)
and can be identified easily. Similarly, the residual voltage is 3 times the zero sequence
voltage (VaO).
3.
Phase-phase faults produce only positive and negative sequence components (assuming 0
prefault currents). As the fault approaches the source, the negative sequence voltage
components increase. For a solid fault at the source (Vf=O) the negative and positive
sequence voltages are equal. This can be seen easily by varying the <P-<P fault voltage from
nominal to 0, and watching the unbalance change from 0 to 100%.
The characteristics of standard faults are summarized in the table below:
Condition
Voltage
Components
Voltage
Unbalance
Current
Components
Current
Unbalance
Normal prefault, balanced
3<1:> current
+ve
sequence
only
0%
+ve
sequence
only
0%
Solid A-G fault (VA=O), no
prefault currents
Va1 = 2Va2
Va1 = VaO
50%
la1 = la2
la1 =laO
100%
Solid <1:>-<I:> fault (VBC=O),
no prefault current
No zero
sequence,
Va1 = Va2
100%
No zero
sequence,
la1 = la2
100%
3<t> fault
+ve
sequence
only
0%
+ve
sequence
only
0%
Solid 2<t>-G fault, VA=VB=O
Va1 = Va2
Va1 = VaO
100%
la1 =laO
la2 = 21a1
50%
These characteristics can be easily verified with Powerscope. Here are some other interesting
things to try if you have a MTS-1710 system to generate currents and voltages.
Phase Sequence
Phase Unbalance
In prefault state, select 3<P fault mode with voltage and some current (eg.
SA). Change the phase sequence from positive to negative and watch the
symmetrical components change from all positive to all negative. Restore
the phase sequence, and watch the symmetrical components return to all
positive.
Start from a balanced 3<P system, and select individual voltage phase adjust
(or individual <P current if you have a MTS-1720). Rotate the phase of one
output and note that this causes the gradual appearance of negative and
zero sequence components. Total negative sequence can be created by
interchanging the phase of any 2 vectors (same as phase sequence
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POWERSCOPE
reversal). Total zero sequence can be created by adjusting 3 vectors to be
in phase.
8.5 IMPEDANCE WINDOW
8.5.1
Using The Impedance Window
This window shows the apparent impedance seen by phase and ground relay elements. For
reference, standard mho relay characteristics can be plotted in this window.
In order for ground element impedances (Zag, Zbg, Zcg) to be displayed properly on apparent
impedance plot, the correct zero sequence compensation factor must be entered. Note that most
people test assuming a homogenous system, ie. the angle of the zero sequence compensation
factor is 0 degrees.
The absolute value of the impedances (Zab, Zbc, Zca, Zag, Zbg, and Zcg) are displayed above
the impedance window in magnitude and angle format. If the currents are zero, the impedance
value will be displayed as infinite.
Some examples of interesting tests presented with the impedance window are:
1.
A reach test performed by slow ramping of current and voltage can dynamically show the
apparent impedance approaching and entering the region of protection. When the relay
operates, the impedance should go to infinity (assuming postfault is set off).
2.
Testing zone 2 and 3 elements with a .5 second or higher timers, a dynamic test will show
the fault impedance of the active element entering the region of protection, and then leaving
when the relay operates. Postfault on with an auto-reclose delay will show system restoration.
3.
The effect of prefault load on apparent impedances can also be readily demonstrated. If
sufficient prefault currents are set, the apparent impedance can be seen outside the region
of protection. High prefault load can cause more than one element to enter the region of
protection.
4.
A manual test of MTA by ramping phase within the impedance circle can dynamically show
the impedance approaching the characteristic boundary on the left and right sides.
8.5.2
Scaling The Impedance Window
To change the scale of the display in the impedance window use the CURSOR UP and CURSOR
DOWN keys. This can be useful for displaying large impedances relative to the size of the circle.
To zoom out press the CURSOR DOWN key. Repeat this until the desired scale is obtained. To
zoom in press CURSOR UP. Repeatedly pressing this will continue to zoom in until the smallest
scale is reached.
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8.6
SPECIAL NOTES
When using an Epson® or compatible printer then the window(s) can be dumped to it by pressing
"P".
Once in the phasor display screen if it is necessary to adjust or correct a value entered press
ESCAPE to return to the menu screen. Any changes made will take affect when the phasor display
screen is entered again. To quit press ESCAPE while in the menu screen.
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MTS-1030 OPERATION AND REFERENCE MANUAL
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SE:CTlON 9
SERVICING
9.1
TROUBLESHOOTING
The only user-serviceable parts are the power fuses. One is located on the rear panel near the
AC inputs. Two others are located inside the case, adjacent to the power supply. Replace the
fuse if required with an ABC 1.5amp/250 volt part.
The voltage input fuses are not user replaceable, as failure may indicate an internal problem which
must be repaired by the distributor. Note that failure of only one of the fuses may still allow a
voltage reading to be obtained, due to the configuration of the input circuitry. The voltage reading
however will normally be incorrect and the phase angle/frequency dependent readings may also
be affected.
Internal servicing should be limited to a quick check that all printed circuit cards are securely
engaged in their receptacle, and that all interwiring connectors are securely seated and screw
terminals tight. The modular construction of the case and circuitry has been designed to ensure
rapid servicing turn around if required and socketed IC's minimize board repair time. The complex
nature of the circuitry however requires qualified technical personnel to ensure rated performance
is maintained.
9.2
CALIBRATION PROCEDURE
The need for calibration adjustments has been minimized by the use of precision components.
There are only five adjustments to be made for all functions. The location of the trim pots are shown
in the diagram below. They are accessible after removing the four screws securing the top half of
the instrument case.
CAUTION:
9.2.1
Calibration should only be attempted by qualified personnel, using good safety
practices and accurate instrumentation. Dangerous voltage are accessible with the
instrument cover removed. Calibration should only be done when an independent
measurement with a 0.1% or better accuracy, true RMS responding instrument,
shows significant drift has occurred. Understand the significance of "±0.4% of
reading ±0.15% of scale" specification to ensure calibrations actually required.
Setup Requirements
A stable variable voltage source of minimum 0-300 volts AC, a stable variable current source of
minimum 0-30 amps AC, an accurate frequency counter, and a 0.1% or better, TRMS responding
AC voltmeter and ammeter are required. The current source must be verified to have an output
which is exactly in phase with the voltage source. All instruments should have been powered on
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MTS-1030 OPERATION AND REFERENCE MANUAL
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SERVICING
for at least 30 minutes.
9.2.2
Procedure
TOP VIEW
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Figure 9-1
1.
Adjust the voltage source to obtain approximately 180 volts. Engage the RANGE switch to
ensure maximum resolution is always obtained. Adjust the AID reference voltage via the
channel 1 AID PCB trimpot, to obtain exactly the same reading as the reference voltmeter.
In a similar manner adjust the channel2 reading.
2.
Now check and record the readings of all three voltage displays while varying the voltage
signal from 2.00 volts to 500 volts. The readings should agree within stated accuracy limits.
If voltages in the 2.00 to 20.00, or 200 to 500 range are out of specification, the instrument
must be returned to the factory for repair.
3.
Power down the voltage test source. Use jumpers to connect all 3 current inputs in series.
Connect the test current source, in series with the reference ammeter, in channel A red and
out channel C black.
4.
Power on the test source, select channel 1 for amperes, and adjust for 10 amps current.
Select A-N current, and adjust the <I>A-1 current trimpot to obtain exactly the same reading as
the reference ammeter.
5.
Check and record all readings at a series of points this time from 200mA to 50amps. Any
additional error factors from the recorded voltage readings should be due to current transformer non-linearity, since the same gain and AID circuits are used.
6.
Repeat Step 4 & 5, except select B-N current, and adjust the <I>B-1 trim pot as required.
7.
Repeat Step 4 & 5, except select C-N current, and adjust the <I>C-N trim pot as required.
9-2
MTS-1030 OPERATION AND REFERENCE MANUAL
MANTA TEST SYSTEMS
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SERVICING
8.
Now power on the voltage source again, and adjust to approximately 100 volts. Select
Channel1 and Channel 2 to the same voltage, and the MTS-1030 display to phase angle.
Press the voltage selection on Channel 2 a second time to invert it's phase and obtain a
reading of roughly 180 degrees. Now adjust the phase angle trim pot to obtain exactly 180.0
degrees.
9.
Finally, check the other phase readings, by first selecting Channel 2 to volts, then both
channels to current. In each case the reading should be 180 ± 0.5 degrees.
10.
Power down the test sources before removing wiring. Note that low current or voltage
readings especially in the high speed mode may be displayed even though no signals are
connected to the inputs. These are 'noise floor' readings, switching noise from the multiplexed LED displays. Whenever a legitimate signal source is present at the inputs however,
an in-spec reading should be obtained down to below 5% of the mOst sensitive scale. Note
also that the very high 2 Mohm input impedance of the voltmeter circuits, may allow a reading
to be present from lead pickup when not connected to a low-impedance voltage source.
9.3
EPROM REPLACEMENT PROCEDURE
The performance of many of the features ofthe meter are controlled by programs stored in Erasable
Programmable Read Only Memory (EPROM). When significant program (software) changes have
been made, or it is desired to incorporate custom changes, it will be necessary to exchange the
resident EPROM for one containing the new programs. This is a very straight forward procedure
which can be done in the field in less than 10 minutes, using a small slot screwdriver and posidrive
#2 screwdriver.
9.3.1
Procedure
1.
Ensure the AC power cord and all signal inputs have been removed from the meter. Ground
the meter case by connecting from the rear panel ground stud to secure ground, and
discharge any static buildup by touching tools and hands to the case.
2.
Remove the four screws securing the top half of the case and lift the top off, exposing the
interior. The printed circuit card to be removed is connected to the BAUD switch on the rear
panel by a twisted pair of yellow wires. Remove these wires from the board by pulling their
connector perpendicular to the card.
3.
Remove the four screws from the corners of the rear panel, and swing it back and up, swiveling
about the lower left corner, to expose the back end of the card to be removed, (card in the
middle slot of the left cardcage). Cut the cable ties securing the vertical connector board at
the rear ofthe card cage, and pull straight back on the connector board, removing it. Remove
the center PC board, holding it by it's edges only. Lay the card, component side up, on a
static-free surface such as a slightly damp cloth, or section of aluminum foil.
4.
The EPROM is a large 28-pin ceramic device with a label on it stating the current software
revision- it will be similar in appearance to the new component to be inserted. Note the polarity
of the component. The small semi-circular notch in one end (identifying pin #1) should be
next to the bottom edge of the board. The new component must be inserted with exactly the
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SERVICING
same orientation.
5.
Gently remove the EPROM from it's socket by sliding the small screwdriver under one end
and lifting. Remove it holding it by the ends {avoid touching the pins) and set on the non-static
surface.
6.
Remove the new EPROM from it's protective foam after touching a grounded surface. Hold
the EPROM by the ends and plug it into the socket, observing correct orientation as above.
When all pins have begun to correctly enter the socket, firmly push into place so it seats fully
on both sides.
7.
This completes installation. Reassemble the case by reversing the instructions above. Make
sure the card is reinserted correctly (component side facing same direction as others, and
the phase angle potentiometer and baud switch connector on top). Double check that the
connectors have been replaced before restoring the top cover. A quick functional check
should be made to verify correct installation.
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APPENDIX A
HIGH SPEED MEASUREMENTS
This MTS-1 030 Powermeter is designed to facilitate high-speed measurements but there are
limitations to it's capabilities in this area that the user should be aware of.
The limiting factor in making AC measurements is the speed of the true RMS conversion circuit.
Unless complex computer-based computation techniques are used, several cycles are required to
generate an equivalent RMS output for the AID converter.
This meter uses a TRMS converter for each channel, with filter constants chosen to give an
accurate result in about 45 msec, or 3 cycles. The AID converters in high-speed mode update 30
times/second, ie 33ms per reading, and depending on what portion of their cycle they were in when
set to this mode, may require at least one cycle to stabilize.
Frequently the action that triggers the high speed circuits, such as switching on or off AC/DC
voltage/current will produce a burst of transient voltages which will be superimposed on the
measured quantity, producing one or more erroneous readings, especially on the high-impedance
voltage inputs. As with most AID systems, higher speed means greater susceptibility to noise,
since it inherently tracks noise signals faster. The result of all these conditions is that reliable
frozen reading of current and voltage cannot be achieved in less than 50 milliseconds, and
significantly longer (::::: 350 milliseconds) may be required for a large step change.
As mentioned previously the frequency multipliers for channel 1 signal, used to derive quantities
for time in Hz, require more than one second to lock on the input frequency, so if high-speed
measurements are required of this quantity there should be a signal present prior to the start of
the measurement cycle.
Time in seconds is easily the most common used feature for triggered measurements, and is
affected by none of the above restraints, since it employs an internal crystal reference oscillator
as it's measurement source. The only timing restriction is the 3 msec minimum interval, set by the
reset action of the trigger to allow 2-wire pulse timing.
Finally, it is of course necessary to have current and voltage ranges set correctly prior to a
high-speed measurement, since each automatic up-ranging can takes nearly one second. This
will be done automatically by the meter if similar values are checked prior to the high-speed test,
and the RANGE switch is then left in the MAN position.
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