Model 7008 - Krohn-Hite
Model 7008
Remote Programmable
Up to 8 Channel Low Noise
Differential Preamplifier
Operating Manual
Service and Warranty
Krohn-Hite Instruments are designed and manufactured in accordance with sound engineering
practices and should give long trouble-free service under normal operating conditions. If your
instrument fails to provide satisfactory service, and you are unable to locate the source of trouble,
contact our Service Department at (508) 580-1660, giving all the information available concerning
the failure.
DO NOT return the instrument without our written or verbal authorization to do so. After contacting
us, we will issue a Return Authorization Number which should be referenced on the packing slip and
purchase order. In most cases, we will be able to supply you with the information necessary to
repair the instrument, avoiding any transportation problems and costs. When it becomes necessary
to return the instrument to the factory, kindly pack it carefully and ship it to us prepaid.
All Krohn-Hite products are warranted against defective materials and workmanship. This warranty
applies for a period of one year from the date of delivery to the Original Purchaser. Any instrument
that is found within the one year warranty period not to meet these standards will be repaired or
replaced. This warranty does not apply to fuses or batteries. No other warranty is expressed or
implied.
Krohn-Hite Corporation reserves the right to make design changes at any time without incurring any
obligation to incorporate these changes in instruments previously purchased.
Modifications to this instrument must not be made without the written consent of an authorized
employee of Krohn-Hite Corporation.
Model 7008
Remote Programmable 8 Channel
Low Noise Differential Preamplifier
OPERATING MANUAL
Unit 4, 15 Jonathan Drive, Brockton, MA 02301-5566
Tel: (508) 580-1660; Fax: (508) 583-8989
E-mail: sales@krohn-hite.com; Web: www.krohn-hite.com
7008ManRev2.docx
V2.0 Dated: 02/14
Copyright© 2014 Krohn-Hite Corporation. All rights reserved. No part of this publication may be
reproduced, stored in a retrieval system or transmitted in any form by any means, electronic,
mechanical photocopying, recording, or otherwise, without the prior written permission of KrohnHite Corporation.
Model 7008, 8 Channel Low Noise Differential Preamplifier
TABLE OF CONTENTS
GENERAL INFORMATION ...................................................................................................................... iv
Certification ................................................................................................................................. iv
Warranty. ..................................................................................................................................... iv
Safety and Preparation for Use. .................................................................................................. iv
Line Voltage. ................................................................................................................................ iv
Line Fuse. ..................................................................................................................................... iv
Line Cord. ..................................................................................................................................... iv
Warranty Service. ........................................................................................................................ iv
Service.......................................................................................................................................... iv
Repackaging for Shipment. .......................................................................................................... iv
Definitions.................................................................................................................................... iv
SECTION 1 - GENERAL DESCRIPTION ..................................................................................................... 5
1.1
INTRODUCTION............................................................................................................................. 5
1.2
SPECIFICATIONS ............................................................................................................................ 5
1.2.1 INPUT .................................................................................................................................. 5
1.2.2 OUTPUT............................................................................................................................... 6
1.2.3 100kHz FILTER ..................................................................................................................... 7
1.2.4 FRONT PANEL ...................................................................................................................... 7
1.2.5 GENERAL ............................................................................................................................. 7
1.2.6 OPTIONS.............................................................................................................................. 7
1.2.7 ACCESSORIES....................................................................................................................... 8
SECTION 2 - OPERATION ........................................................................................................................ 9
2.1
INTRODUCTION............................................................................................................................. 9
2.2
POWER REQUIREMENTS ............................................................................................................... 9
2.3
TURN-ON PROCEDURE.................................................................................................................. 9
2.4
FRONT PANEL DISPLAY AND CONTROLS..................................................................................... 10
2.4.1 MODE ................................................................................................................................ 10
2.4.1.1
LCL (local mode) ............................................................................................... 10
2.4.1.2
EDIT (edit mode) ............................................................................................... 10
2.4.1.3
REMOTE (remote mode) .................................................................................. 11
2.4.2 CHANNEL UP, CHANNEL DOWN CONTROL ....................................................................... 12
2.4.3 SETTING PARAMETERS...................................................................................................... 13
2.4.3.1
INPUT CONFIGURATION ................................................................................... 13
i
2.4.3.2
100kHz LOW-PASS FILTER ................................................................................. 15
2.4.3.3
INPUT COUPLING .............................................................................................. 15
2.4.3.4
GAIN .................................................................................................................. 16
2.4.3.5
SHUNT (OHMS) ................................................................................................. 17
2.4.4 DC OFFSET ......................................................................................................................... 19
2.4.5 INPUT + AND - BNC CONNECTORS .................................................................................... 19
SECTION 3 - INCOMING ACCEPTANCE ................................................................................................. 21
3.1
INTRODUCTION........................................................................................................................... 21
3.2
TEST EQUIPMENT REQUIRED ...................................................................................................... 21
3.3
GAIN ACCURACY ......................................................................................................................... 21
3.4
NOISE CHECK............................................................................................................................... 22
3.5
COMMON MODE REJECTION...................................................................................................... 22
3.6
DISTORTION CHECK .................................................................................................................... 22
3.7
AC/DC COUPLING CHECK ............................................................................................................ 22
SECTION 4 - USB-COM OPTION (for Remote Programming) ............................................................... 24
4.1
INTRODUCTION........................................................................................................................... 24
4.2
USB-COM OPTION ...................................................................................................................... 24
4.2.1 INSTALLING THE DRIVERS ................................................................................................. 25
4.2.2 DRIVER INSTALLATION SEQUENCE ON A WINDOW XP™ S ............................................... 25
4.2.2 HOW TO SET-UP/RUN WINDOWS™ HYPER-TERMINAL ON WINDOWS XP™ SYSTEM...... 27
4.2.3 AN ALTERNATE TO HYPER-TERMINAL OPERATION .......................................................... 31
4.3
MODEL 7008 PROGRAMMING COMMANDS .............................................................................. 33
4.3.1 TABLE OF COMMANDS ..................................................................................................... 34
4.3.2 COMMAND STRING EXAMPLES ........................................................................................ 34
4.3.3 REPSONSE TO A COMMAND STRING ................................................................................ 35
SECTION 5 - LAN-COM OPTION (for Remote Programming) ............................................................... 36
5.1
INTRODUCTION........................................................................................................................... 36
5.1.1 SITE LANs AND PRIVATE LANs ........................................................................................... 36
5.1.2 CONNECTING THROUGH A NETWORK .............................................................................. 36
5.1.3 CONNECTING DIRECTLY TO THE MODEL 7008 (no network) ........................................... 36
5.1.4 HOW TO FIND THE CURRENT IP ADDRESS ........................................................................ 36
5.1.5 SETTING A FIXED IP ADDRESS ........................................................................................... 38
5.1.6 LAN and HyperTerminal Setup.......................................................................................... 41
5.1.7 How to Set-Up and Run Windows™ HyperTerminal......................................................... 41
ii
SECTION 6 - REMOVING AND INSTALLING PREAMPLIFIER CARDS..................................................... 44
6.1
INTRODUCTION........................................................................................................................... 44
6.2
REMOVING A MODEL 700 PREAMPLIFIER CARD ........................................................................ 44
6.3
INSTALLING THE MODEL 700 PREAMPLIFIER CARD ................................................................... 46
iii
GENERAL INFORMATION
Certification - Krohn-Hite certifies that this product meets published specifications at the time of
shipment.
Warranty - This Krohn-Hite Corporation product is warranted against defects in materials and
workmanship for a period of one (1) year from the date of shipment.
Safety and Preparation for Use - Dangerous voltages, capable of causing injury or death, are present
in this instrument.
Warning! Use extreme caution whenever the instrument covers are removed. Do not remove the
covers while the unit is plugged into a live outlet.
Line Voltage - The Model 7008 accommodates any voltage in the range 105Vac to 132Vac or 210Vac
to 264Vac, with a frequency in the range 50Hz to 60Hz.
Line Fuse - The line fuse is located on the rear of the 7008. The fuse is a 3/4A slow-blow for 120V
applications and a 3/8A slow-blow for 240V applications.
Line Cord - The Model 7008 has a detachable, three-wire power cord for connection to the power
source and to a protective ground. The exposed metal parts of the instrument are connected to the
outlet ground to protect against electrical shock. Always use an outlet which has a properly
connected protective ground.
Warranty Service - For warranty or repair service, this product must be returned to a Krohn-Hite
Corporation authorized service facility or to Krohn-Hite directly. Contact must be made with KrohnHite Corporation or an authorized representative to receive a Return Authorization before returning
this product for repair.
Service - Do not attempt to service or adjust this instrument unless another person, capable of
providing first aid or resuscitation, is present. Do not install substitute parts or perform any
unauthorized modifications to this instrument. Contact the factory for instructions on how to return
the instrument for authorized service and adjustment. The Model 7008 is not intended for hotswapping applications. Be certain to switch power off before inserting or removing plug-in cards in
the chassis.
Repackaging for Shipment - The original packing materials should be saved for reshipment of the
Model 7008 if needed. If the original packing materials are not available, wrap the instrument in
polyethylene sheeting or equivalent and place in a strong box, cushioning it on all sides by at least
three inches of high-density foam or other filler material.
Definitions - A Bracket set [ ] indicates a button.
iv
Section 2 – Operation
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SECTION 1
GENERAL DESCRIPTION
1.1
INTRODUCTION
The Krohn-Hite Model 7008 is a two to eight channel Differential Preamplifier providing low noise
and high gain amplification to 1MHz. The output of the 7008 is derived from using a very low noise
FET instrumentation amplifier. Noise referred to input is 7nV√Hz and common mode rejection is
>100dB at 1kHz. The Model 7008 has fixed gain settings of x1 (0dB), x10 (20dB), x100 (40dB) and
x1000 (60dB).
The 7008 provides momentary pushbutton switches that control input coupling, 100kHz filtering
(std), gain, channel selection, shunt resistor for low level signal applications, input configuration and
local/remote/edit selections. BNC connectors are provided for single-ended and differential input
configurations, and for the amplified output. All settings can be edited and monitored with the 16
character, 2-line front panel display.
Optional USB or LAN remote control is available for the 7008. All front panel functions, with the
exception of power on, can be controlled remotely with either option. See Section 3 for
programming information.
The 7008 is an excellent preamp for amplifying low level input signals to oscilloscopes or other
devices. The 7008 is also very useful for troubleshooting sources of noise, amplifiers, power supplies
and various other electronic circuits.
1.2
SPECIFICATIONS
1.2.1 INPUT
Configurations: Single-ended and differential, selectable.
Coupling: AC (0.16Hz, 0.16mHz with option 10 installed) and DC, selectable.
Impedance: 1M ohm (1G ohm with option 10 installed) shunted by 40pF. Each input may be
independently enabled or grounded.
Input Shunt Resistor: 50, 500, 5k and 50k ohm ±0.3%, and open, selectable.
Maximum Power
Maximum
Across Shunt
Resistor Value
Current
Maximum
Resistor
(1/4W, ohms)
(amps)
Voltage
(watts)
50
0.05
2.5
0.125
500
0.016
8
0.128
5,000 (5k)
0.002
10*
0.020
50,000 (50k)
0.0002
10*
0.002
*Maximum power limited by maximum voltage of 10V.
5
Section 2 – Operation
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Maximum Input Voltage: 10V peak with gain set to x1.
Max Safe Voltage: Any continuous voltage between ±30V (for 7008-10 option: ±15V).
Gains: x1 (0dB), x10 (20dB), x100 (40dB), x1000 (60dB), selectable.
Accuracy: ±0.3dB.
Stability: 200ppm/°C.
Bias Current: ±5pA typical, 50pA max.
CMMR:
Freq
Gain = 1
Gain = 10 to 1k
50Hz
>90dB
>102dB
10kHz
>75dB
>87dB
50kHz
>60dB
>72dB
1.2.2 OUTPUT
Maximum Output Voltage: 10V peak.
Frequency Response:
Wideband Noise (Referred to input, 2MHz Bandwidth Detector)
GAIN
1
10
100
1k
100kHz
FILTER OFF
(µVrms)
120
14
10
10
100kHz
FILTER ON
(µVrms)
90
9
3.2
3.2
Noise Density (x1k gain setting, filter off): 7nV/√Hz typical.
Impedance: 50 ohms, single-ended.
Distortion: 0.005% (-85dB) at 1kHz.
Offset Voltage: Adjustable to zero.
6
Option 11
400Hz Filter
(µVrms)
40
4
0.85
0.85
Section 2 – Operation
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1.2.3 100kHz FILTER
Cutoff Frequency: 100kHz (option 11, 400Hz; replaces 100kHz filter), 2-pole, 12dB/octave;
selectable. Selections are on and off.
1.2.4 FRONT PANEL
Momentary Pushbutton Switches: For setting Channel, Input Configuration, 100kHz Filter, Input
Coupling, Gain,
Shunt Resistor and Local/Remote/Edit modes of operation.
DC Offset Adjustment Potentiometer: Range, approximately ±30mVdc.
Display: 2-line, 16 character.
1.2.5 GENERAL
Power Requirements: Switch selectable, 90-130, 210-260 volts, single-phase, 50-60Hz, 50W.
Protection: Input overload protection with automatic recovery.
Isolation to Chassis: ±200Vdc.
Operating Temperature: 0°C to +45°C.
Storage Temperature: -25°C to +70°C.
Dimensions: 4“ (10.28cm) high with feet, 3.5" (9cm) high without feet; 14.15" (36.36cm) wide; 14.3”
(36.75cm) deep.
Weights: 12 lbs (5.4kg) net, 14 lbs (6.3kg) shipping.
Certification: A Certificate of Compliance is issued with each new instrument to certify the
calibration and traceability to N.I.S.T.
Warranty: ONE FULL YEAR warranty on parts and labor includes specifications and performance.
1.2.6 OPTIONS
LAN-COM: LAN remote control.
USB-COM: USB remote control.
Option 10: Input impedance is 1G ohm.
Option 11: 400Hz filter in place of 100kHz filter.
Extended 1 Year Warranty: Part No. EW7008.
7
Section 2 – Operation
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1.2.7 ACCESSORIES
Rack Mount Kit: Part No. RK-314 consists of 2 angle brackets with handles that permit the
installation of the Model 7008 into a standard, 19" rack spacing.
CAB-025: Cable, BNC, 3ft, Low Noise.
LPNF: 2MHz Low-Pass Noise Filter
2720B: Carrying Case
Specifications is subject to change without notice.
8
Section 2 – Operation
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SECTION 2
OPERATION
2.1
INTRODUCTION
This section describes the basic operation of the Model 7008. It includes the proper power
requirements, the recommended turn-on procedure and a detailed explanation of all operating
controls, modes of operation and special optional features.
2.2
POWER REQUIREMENTS
The Model 7008 is designed to operate from a single phase, 50-60Hz, ac power source of 105-132,
210-264 volts. This unit is set for 115V operation at the time of shipment. Fuse requirement is 0.75A
(120V) or 0.375A (230V) slow, blow with a 250V rating.
2.3
TURN-ON PROCEDURE
Before turning on the 7008, check to see that the line switches on the rear panel are set to the
correct AC Power Line requirements for your area. Refer to the chart below.
Make sure the POWER switch is in the OFF position. Plug the line cord into the unit and then into the
ac outlet.
WARNING!
The chassis of this instrument is connected to earth ground. For safety
purposes, connect the line cord to a grounded, 3 terminal ac outlet.
CAUTION!
Because of the potentially dangerous voltages that exist within the
unit, the cover should not be removed when the instrument is
connected to an ac power source.
The unit is now ready to operate. For low noise applications, it is recommended to use Krohn-Hite’s
low noise cable, part number CAB-025.
9
Section 2 – Operation
_________________________________________________________________________________
2.4
FRONT PANEL DISPLAY AND CONTROLS
The Model 7008 provides a 16-character, 2-line DISPLAY that indicates the status of all parameters
and modes of each channel as shown in Figure 2.1 below. When turn-on, the display will indicate:
Krohn-Hite 7008. All functions are available by front panel control and remote control. An audible
beep for tactile feel is provided and will sound with each button press.
2.4.1 MODE
The 7008 provides 3 Modes of operation, Remote, Local and Edit. Remote and local modes are
controlled by pressing the [LOCAL/REMOTE] button. Edit mode becomes active when a parameter is
changed when in the local mode. See EDIT below for full details.
a) LCL, local control
b) REMOTE, remote control
c) EDIT, Edit mode (You will need to press [SAVE EDIT] to change output settings once
altered.)
2.4.1.1 LCL (local mode)
When LCL is displayed all front panel controls are active. Pressing the [LOCAL/REMOTE] button will
return the 7008 to remote control.
Figure 2.1 – Local Mode Display
2.4.1.2 EDIT (edit mode)
The EDIT mode becomes active whenever a parameter button is pressed. In this mode you can
changed the settings of any or all channels if desired and saved to non-volatile memory.
Figure 2.2 – EDIT Mode Display
Once the parameter change(s) are set, pressing the [SAVE EDIT] button will save the setting for that
channel. If in ALL channel, all parameter changes will be saved to all channels.
10
Section 2 – Operation
________________________________________________________________________________
Figure 2.3 – [SAVE EDIT] Mode Button
Parameters are changed by pressing the button associated with that parameter. When a button is
pressed, the LCL display will change to EDIT indicating that you have entered the EDIT mode and will
need to press the [SAVE EDIT] button to save one or all changes made to that channel.
Figure 2.4 – Front Panel Display
When the CHANNEL display indicates ALL, dashes will appear in the display, indicating that a
parameters need to be set. In this mode, all parameters have to be entered with a value or the
display will indicate the following:
Not All
Parameters Set
If a Channel is defective or there is no card in a Channel slot, the display will indicate a NO CHANNEL
with the Channel number that is missing or defective as indicated in Figure 2.5 below.
Figure 2.5 – Missing or Defective Card
2.4.1.3 REMOTE (remote mode)
When REMOTE is displayed all front panel control are disabled, with the exception of the
[LOCAL/REMOTE] button. When in Remote mode, pressing this button will return the 7008 to local
control.
11
Section 2 – Operation
_________________________________________________________________________________
Figure 2.6 – Remote Mode Display
ERROR INDICATOR
When the 7008 is placed into the REMOTE mode, a beep tone is activated. When any parameter
button is pressed, a beep tone will sound, indicating the 7008 is in REMOTE operation. Pressing the
[REMOTE/LOCAL] button toggles between REMOTE and LOCAL, and when the 7008 is in REMOTE,
will return the unit to LOCAL operation.
2.4.2 CHANNEL UP, CHANNEL DOWN CONTROL
Pressing the [CHANNEL UP] and [CHANNEL DOWN] buttons will display each channel’s current setup.
Figure 2.7 – [Channel Up] Button
Figure 2.8 [Channel Down] Button
Each channel’s parameters are entered independently or all at one time when in the ALL channel
mode. When setting or changing a specific channel’s parameters, the output signal for that channel
will not change until the [SAVE EDIT] button is pressed. The same is true for the ALL channel mode.
If a parameter is changed, and [CHANNEL UP] or [CHANNEL DOWN] button is pressed before the
[SAVE EDIT] button, the parameters will not change. Pressing the [SAVE EDIT] button will then
change the parameter(s) to the values selected.
12
Section 2 – Operation
________________________________________________________________________________
2.4.3 SETTING PARAMETERS
Each parameter of the Model 7008 can be set either manually or by remote control. The following
information will describe what parameter can be set and how to set them.
2.4.3.1 INPUT CONFIGURATION
There are two input connectors located at the INPUT section of the front panel. The following will
describe how to select either single-ended (+ or -), differential (DIFF), or OFF (ground) the inputs.
The + and - inputs are voltage inputs with 1 MΩ (1G optional) in parallel with a 40pF, input
impedance. Their connector shields are completely isolated from chassis ground, but can be made
common with chassis ground by connecting the shield of the BNC connector to chassis ground.
When connected in this manner, the chassis of the unit is always be connected to the grounding
conductor of the AC power cord. The inputs are protected to 30V, however to prevent clipping, the
input should never exceed 10V peak with a gain of X1. The maximum DC input before overload
depends on the gain value selected.
Preventing Ground Loops
Ground loops are troublesome in analog measurements and can degrade the signal by adding
unwanted noise to the system. To achieve the lowest possible noise, proper grounding techniques
are important.
To minimize the possibility of a ground loop when connecting to the 7008, connect all equipment, if
possible, to the same AC strip and make certain that all third wire ground pins are on the plugs. Use
a central ground point for your entire test setup. If you are using shielded cables, connect the shield
to only one end and keep all wiring and cabling as short as possible; avoid looping wires and cables.
There are 4 ways to configure the input of the 7008. Pressing the [INPUT CONFIG] button will cycle
through the desired settings.
Figure 2.9 – [Input Config] Button
13
Section 2 – Operation
_________________________________________________________________________________
+SE: Plus
Plus single-ended input BNC
active, -input BNC is grounded.
Figure 2.10 – Plus Single-Ended Input Display Setting
-SE: Minus
Minus single-ended input BNC
active, +input BNC is grounded.
Figure 2.11 – Minus Single-Ended Input Display Setting
DIFF (lowest noise configuration)
Differential input, both input
BNC’s active, BNC shield grounded.
When used with a single-ended
output, connect the minus to the
source ground.
Figure 2.12 – Differential Input Display Setting
OFF
Both inputs are grounded. Useful for nulling dc offsets.
Figure 2.13 – OFF, Both Inputs Grounded Display Setting
Figure 2.14 – [SAVE EDIT] Button
Note: While changes are made to the Input Configuration, the selected configuration
of the channel displayed will not change until the [SAVE EDIT] button is pressed. You
can press [SAVE EDIT] as each parameter is changed, or you can wait until all changes
to each parameter are made.
14
Section 2 – Operation
________________________________________________________________________________
2.4.3.2 100kHz LOW-PASS FILTER
A 100kHz, 2-Pole (12dB/octave), low-pass filter is provided to limit the bandwidth of the signal to
reduce any high frequency noise within the signal. The normal operating frequency is DC to 1MHz in
the DC coupled mode and 0.16Hz (0.16mHz with option 10 installed) to 1MHz in the AC coupled
mode. When the FILTER is activated, the upper frequency output is limited to 100kHz; or with the
option 11 installed, 400Hz.
Pressing the [FILTER] button shown below will cycle the filter 100K and OFF.
Figure 2.15 – [FILTER] Button
Figure 2.16 - Low-Pass Filter 100K Display Setting
Figure 2.17 - Filter OFF Display Setting
Note: While changes are made to FILTER, the filter
value selected on the channel displayed will not
change until the [SAVE EDIT] button is pressed.
2.4.3.3 INPUT COUPLING
Pressing the [INPUT COUPLING] button, shown in the Figure 2.19, will switch between AC or DC
input coupling.
15
Section 2 – Operation
_________________________________________________________________________________
The 7008 provides AC and DC coupling of the input signal. AC coupling consists of using a capacitor
to filter out the DC signal component from a signal with both AC and DC components in it. When AC
coupled, the DC component of the signal acts as a voltage offset, and removing it from the signal can
increase the resolution of signal measurements. The capacitor in the 7008 is in series with the signal
and will pass all AC frequencies from 0.16Hz (0.16mHz with option 10 installed) to 1MHz. The
100kHz low-pass filter can also be selected while AC-coupled.
DC coupling is described as any voltage signal acquisition where both AC and DC components are
measured.
Figure 2.19 – [Input Coupling] Button
Figure 2.20 – AC Coupling Display Setting
Figure 2.21 – DC Coupling
Display Setting
Note: While changes are made to INPUT COUPLING, the coupling
value selected on the channel displayed will not change until the
[SAVE EDIT] button is pressed.
2.4.3.4 GAIN
A preamplifier is often placed close to a sensor to reduce the effects of noise and interference on
the input signal. It is used to amplify the signal to drive the cable to the data collection instrument
without significantly degrading the signal-to-noise ratio of the signal. The noise performance of a
preamplifier is critical. When the gain of the preamplifier is high, the signal-to-noise ratio of the final
signal is determined by the signal-to-noise ratio of the input signal and the noise of the preamplifier.
The Model 7008 incorporates 4 GAIN selections for improving the signal-to-noise ratio of the input
signal. They are:
a) X1, Unity gain or no gain
b) X10, 20dB
c) X100, 40dB
d) X1000, 60dB
16
Section 2 – Operation
________________________________________________________________________________
To select the desired gain, press the [GAIN] button, shown in Figure 6 below, until the desired gain is
achieved.
Figure 2.22 – [Gain] Button
X1 (Unity Gain, 0dB)
Figure 2.23 – X1 Gain Display Setting
X10 (20dB Gain)
Figure 2.25 – X10 Gain Display Setting
X100 (40dB Gain)
Figure 2.24 – X100 Gain Display Setting
X1000 (60dB Gain)
Figure 2.26 - X1000 Gain Display Setting
Note: While changes are made to GAIN, the Gain value selected on
the channel displayed will not change until the [SAVE EDIT]
button is pressed.
2.4.3.5 SHUNT (OHMS)
A selectable input shunt resistor is provided in the 7008. This shunt resistor provides a means to
measure the source current from the source device by connecting a current meter across the input
terminals of the 7008.
Maximum Power
Across Shunt
Maximum
Maximum
Resistor Value
Current
Voltage
Resistor
(1/4W, ohms)
(amps)
(volts)
(watts)
50
0.05
2.5
0.125
500
0.016
8
0.128
5,000 (5k)
0.002
10*
0.020
50,000 (50k)
0.0002
10*
0.002
*Maximum power limited by maximum voltage of 10V.
17
Section 2 – Operation
_________________________________________________________________________________
To select the desired shunt resistor, press the [SHUNT] button, shown in the Figure 2.27 below, until
the desired resistor is selected.
Figure 2.27 – [Shunt Resistor] Button
Figure 2.28 – 50 Ohm Shunt Display Setting
Figure 2.29 – 500 Ohm Shunt Display Setting
Figure 2.30 – 5k Shunt Display Setting
Figure 2.31 – 50k Shunt Display Setting
18
Section 2 – Operation
________________________________________________________________________________
Figure 2.32 – OPEN Shunt Display Setting
Note: While changes are made to the Shunt value, the resistor value
selected of the channel displayed will not change until the [SAVE
EDIT] button is pressed.
2.4.4 DC OFFSET
A DC offset that may appear at the output terminals is adjustable to 0V by an independent DC
OFFSET ADJUST located on the front panel of each channel. The DC Offset can be adjusted using a
small flat screwdriver and a dc voltmeter connected to the output of the channel being adjusted.
Both input terminals for that channel need to be shorted to ground before making the adjustment.
DC
Offset
Adjust
Figure 2.33 – DC Offset Adjust
2.4.5 INPUT + AND - BNC CONNECTORS
The + and – input BNC connectors have an input impedance of 1G ohm shunted by 40pF. Each input
is independently controlled by pressing the [INPUT CONFIG] button for the channel selected. See
paragraph 2.4.3.1 Input Configuration.
Figure 2.34 – Input/Output BNC Connectors
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Section 2 – Operation
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20
Section 3 – Incoming Acceptance
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SECTION 3
INCOMING ACCEPTANCE
3.1
INTRODUCTION
The following procedure should be used to verify that the Model 7008 preamplifier is operating
within specifications. These checks may be used for incoming acceptance and periodic performance
checks.
Tests must be made with all covers in place and operating for a minimum of 30 minutes to reach
operating temperature.
3.2
TEST EQUIPMENT REQUIRED
The test equipment below is required to perform the following tests:
a.
b.
c.
d.
e.
f.
g.
3.3
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
Low Distortion RC Oscillator: Krohn-Hite Model 4402B or equivalent.
RC Oscillator: 10Hz to 10MHz.
AC Voltmeter: Capable of measuring 100µV to 10Vrms, 10MHz bandwidth.
Fluke Model 8920A or equivalent.
Frequency Counter.
Distortion Analyzer: Krohn-Hite Model 6900B or equivalent.
2MHz Low-Pass Filter, Krohn-Hite Model LPNF or equivalent.
2MHz Filter: Krohn-Hite Model LPNF, 2MHz Low-Pass Noise Filter or equivalent.
GAIN ACCURACY
With a BNC tee, connect both the oscillator and the AC meter to the preamplifier ‘+’ Input.
Set the preamplifier’s FILTER to OFF.
With the meter in volts mode, set the oscillator to 1 kHz, and about 700mVrms.
Set the meter to read 0dB (dB and REL mode on the Fluke 8920).
Connect the meter to the preamplifier output. Set the input gain to x 10 (20dB), the meter
should read 19.7 to 20.3dB.
Connect the meter to the preamplifier’s ‘+’ Input and set it to volts mode.
Set the oscillator to about 70mVrms.
Set the meter to read 0dB (dB and REL mode on the Fluke 8920).
Connect the meter to the preamplifier’s output.
Set the input gain to x 100 (40dB), the meter should read 39.7 to 40.3dB.
Connect the meter to the preamplifier’s ‘+’input and set it to volts mode.
Set the oscillator to about 10mVrms.
Set the meter to read 0dB (dB and REL mode on the Fluke 8920).
Connect the meter to the preamplifier’s output.
Set the input gain to x 1k (60dB), the meter should read 59.7 to 60.3dB.
21
Section 3 – Incoming Acceptance
_________________________________________________________________________________
It is important that the generator has low noise; passive BNC attenuators if needed produce the best
results, placed at the preamplifier’s input.
3.4
1.
2.
NOISE CHECK
Turn off both inputs of the preamplifier, set the gain to X1.
Connect a 2MHz low pass, passive filter, shown in the following figure to the ac volt meter and,
using a short coax BNC cable, connect it to the preamplifier’s output.
Figure 3.1 – Model 7008 Preamplifier and Model LPNF 2MHz Low-Pass Filter
3.
4.
5.
6.
3.5
1.
2.
3.
4.
5.
6.
3.6
1.
2.
3.
4.
3.7
1.
2.
3.
4.
5.
22
Voltmeter reading should be 90µV or less.
Set the preamplifier gain to X10. The voltmeter reading should be 130µV or less.
Set the preamplifier gain to X100. The voltmeter reading should be 1.2mV or less.
Set the preamplifier gain to X1k. The voltmeter reading should be 12mV or less.
COMMON MODE REJECTION
Set the preamplifier’s FILTER to OFF.
Set the gain to x 1k.
Set the generator to 50 Hz at 7Vrms.
Connect the generator to the + and – inputs simultaneously.
Connect the ac volt meter to the preamplifier output. Reading should be <45mVrms.
Set the generator to 50 kHz. AC volt meter should read <1.6Vrms.
DISTORTION CHECK
Set the preamplifier to a cut off frequency of 100 kHz in the low-pass mode with 0dB of gain.
Connect a low distortion oscillator to the INPUT and apply a 1Vrms signal at 1 kHz.
CAUTION: If the distortion is excessive, verify that the distortion of the oscillator
being used is <0.004%. Monitor the OUTPUT of the preamplifier with a
distortion analyzer.
The reading should be <0.005%.
Disconnect oscillator and distortion analyzer.
AC/DC COUPLING CHECK
Apply a 1Vdc signal to the + INPUT of the preamplifier.
Ground the – input of the preamplifier.
Set the gain to 0dB.
Set the FILTER to the off position.
Set COUPLING to DC.
Section 3 – Incoming Acceptance
________________________________________________________________________________
The OUTPUT of the preamplifier should be approximately 1Vdc and 0Vdc in the AC COUPLED
mode.
23
Section 4 - USB-Com Option
_________________________________________________________________________________
SECTION 4
USB-COM OPTION
(for Remote Programming)
4.1
INTRODUCTION
The Model 7008 has the ability to be remotely controlled by installing the USB-COM option. With
the USB-COM option, the Model 7008 can be remotely controlled via the USB connection from your
computer. It gives the user full control of all parameters over the USB Bus. The following
information will give suggested steps to get quickly started connecting, configuring and using the
7008 on a USB connection directly to your PC.
4.2
USB-COM OPTION
The USB-COM option is a USB bus powered remote programming option, which uses drivers
supplied by Future Technology Devices International Ltd (FTDI), making it possible to remotely
control the Model 7008 by sending specific commands.
The FTDI USB drivers can be operated in one of two general modes: Virtual COM port (VCP) or
D2XX. Once the VCP drivers are loaded, all that is required of the host app is to open what appears
to be an RS232 port (it shows up in Device Manager as a COM port), set the baud rate to 38,400 and
start to send and receive data using the exact same methods and source code as those used with
the original DB9 ports.
The downside to using the VCP drivers is the same issue that has always plagued legacy developers
using DB9 ports is how do you determine which COM port your hardware is connected to? The
options are limited to either assuming your hardware is on a particular COM port (dangerous), or
the host app has to open every available port and send out a ping then wait for the correct reply
(which is both tedious and time consuming).
The second option is to use the D2XX drivers. In this mode, the host app can tell how many FTDI
USB devices are connected to the PC and what each device’s name or serial number is with the FT
ListDevices() function call. The port can then be opened to a specific FTDI USB device using either its
name or serial number (both are programmed into the USB interface chip) using the FT_OpenEx()
function call. The hardware can be plugged into any available USB port and later changed to a
different port on the host PC or connected hub without restriction or any need to relearn the
location of the device. The downside to using the D2XX drivers is the use of the library. Either the
.lib library file must be included in the source code project, or the functions in the DLL must be
loaded at run time.
24
Section 4 - USB-Com Option
________________________________________________________________________________
The D2XX Programmer's Guide lists the functions available in the FTD2XX.DLL. It can be downloaded
at:
http://www.ftdichip.com/Support/Documents/ProgramGuides.htm
Programming examples using the D2XX drivers and DLL can be found in the Projects section of the
FTDI site.
The default EEPROM setting is set to install the VCP driver. An example is provided that shows how
to program the 7008 using a Windows™ terminal program is in Paragraph 4.2.2, page 26.
Directions for the supplied Windows™ program FT Prog, (also on Krohn-Hite.com), which allows
changing the EEPROM to use the DLL programming driver is found in Paragraph 4.2, page 23.
4.2.1 INSTALLING THE DRIVERS
The Windows™ combined driver model (CDM), which may be installed on Windows 2000™, XP™,
VISTA™ or Windows 7™, allows applications to access FTDI devices through either the D2XX DLL or a
COM port without having to change driver type. However, it should be noted that an application can
only communicate through one of these interfaces at a time and cannot send commands to the
D2XX DLL and the associated COM port at the same time.
The CDM driver comes in two parts. The first part is the bus layer that provides D2XX style
functionality and is always installed. The second part is the serial COM port layer and the CDM driver
will determine whether a COM port should be exposed by reading the EEPROM built into the device.
The drivers will install if needed when you plug in the supplied USB cable into the computer.
4.2.2
DRIVER INSTALLATION SEQUENCE ON A WINDOW XP™ S
Click “Next” to start.
Figure 4.1 - Hardware Wizard
25
Section 4 - USB-Com Option
_________________________________________________________________________________
Figure 4.2 - Hardware Wizard Searching
Click “Finish” and the last driver should
install.
Figure 4.3 - Completing Hardware Wizard
Click “Next” to start.
Figure 4.4 - Hardware Found
26
Section 4 - USB-Com Option
________________________________________________________________________________
Click “Finish” to exit the Wizard.
Figure 4.5 - Finishing Hardware Wizard
4.2.2
HOW TO SET-UP AND RUN WINDOWS™ HYPER-TERMINAL ON A WINDOWS XP™ SYSTEM
Windows™ HyperTerminal can be used to program the Krohn-Hite Model 7008 using the USB
connection.
First install the USB drivers by connecting the computer to the 7008 and follow the prompts.
Start Windows™ HyperTerminal by doing the following:
Click START, then ALL PROGRAMS, then ACCESSORIES, then COMMUNICATIONS and finally HYPER
TERMINAL.
The Hyper Terminal program now opens.
Open a new connection if needed and enter a name in the Name box: (example: 7008), pick an Icon
(optional), and then click on the "OK" button.
Figure 4.6 - HyperTerminal Connection
27
Section 4 - USB-Com Option
_________________________________________________________________________________
Next the “Connect to” window appears.
Select the correct com port from the “Connect Using” drop down box.
Click the “OK” button when done.
Figure 4.7 - HyperTerminal Connect to Screen
If you need to find the port #, look in device manager “Ports (COM & LPT)” to find the “USB Serial
Port” number. Windows™ short cut key; press both the Windows™ Start & Break key to open the
System section of control panel, then click on the Hardware tab. Click the Device Manger button to
open it , then click the “+” beside Ports ( COM & LPT) to list all ports for the computer.
Figure 4.8 - System Properties and Device Manager Screens
28
Section 4 - USB-Com Option
________________________________________________________________________________
Close the Device manger & Control Panel when finished.
Next open the properties settings by clicking the “File” menu item and selecting “properties” from
the list.
Set the Port Settings to the following.
Bits per second to 38400.
Data bits to 8.
Parity to None.
Stop bits to 1.
Flow control to None.
Click the “OK” button when done.
Figure 4.9 -Comm Properties Screen
Next open the properties settings by clicking the “File” menu item and selecting “properties” from
the list. Click on “Settings” tab and select the items to match the following Figure.
Click on “Windows keys” under Function, arrow and ctrl
keys act as.
Click on “Del” under Backspace key sends.
Click on the Emulation arrow and select "VT100".
Click on “ASCII Setup” and select the items to match the
following Figure.
Figure 4.10 - 7008 Properties Screen
29
Section 4 - USB-Com Option
_________________________________________________________________________________
Select "Send line ends with line feeds".
Select "Echo typed character locally".
Click "OK" to close the ASCII setup box.
Figure 4.11 - ASCII Setup Screen
Click "OK" to close the Properties Box window.
Communications should now be available, HyperTerminal screen bottom left should display
“Connected” as in the Figure below.
Figure
4.12
-
7008
HyperTerminal
Connection
Now verify that the communications is established by typing in “CH1,S” and press enter.
If there is communication, the Model 7008 will return the Setup string for the channel entered. In
this example: CH1;G2;CP1;BW1;IC1;SR1
30
Section 4 - USB-Com Option
________________________________________________________________________________
Figure 4.13 - 7008 HyperTerminal Commands Example
4.2.3
AN ALTERNATE TO HYPER-TERMINAL OPERATION
For Windows™ systems that do not have MS HyperTerminal support (i.e. Windows 7™ or later) or an
alternate to HyperTerminal , an open source terminal program called Tera Terminal can be used.
The latest version for Tera Terminal can be downloaded from:
http://en.sourceforge.jp/projects/ttssh2/releases/
Once installed, just run the Tera Terminal EXE from the Tera Terminal folder under “all Programs”,
which is off of the start menu.
Click “New Connection” from the file menu. You should see a screen similar to the one below.
Figure 4.14 - Tera Terminal New Connection Screen
Select “Serial” and the correct port number (Comm10 in this case) and click “OK”.
Click “Terminal” from the Setup menu above. The following screen appears.
31
Section 4 - USB-Com Option
_________________________________________________________________________________
Figure 4.15 - Tera Terminal Setup Scrren
If needed, adjust the settings to match the Figure above. Click “OK”.
Click “Serial Port” from the Setup menu. The following screen appears.
Figure 4.16 - Tera Terminal Serial Port Setup Screen
Set the “port:” to the port number used in the first Figure (Com10 in this example).
Set the “Baud rate:” to 38400, “Data:” to 8 bit, “Parity:” to none, “Stop:” to 1 bit.
Set the “Flow control:” to none and click “OK”.
Now you can send remote commands and you should receive a reply back.
32
Section 4 - USB-Com Option
________________________________________________________________________________
Figure 4.17 - Tera Terminal VT Screen
Here is an example of a query (“s” command) of channel 1, along with the reply.
4.3
MODEL 7008 PROGRAMMING COMMANDS
The following information describes the command syntax needed to program the 7008. All
commands can be upper or lower case. They also can be combined as long as each command is
followed by a delimiter. Valid delimiters are the colon (;) and the comma (,). A carriage return and
line feed is also needed at the end of the command string to inform the 7008 of the end of the
string.
The data string is sent with the channel number first followed by the delimiter then any or all of the
commands for that channel. The commands can be sent in any order. Valid channel numbers are
ch1 through ch8 or AL for setting all channels.
33
Section 4 - USB-Com Option
_________________________________________________________________________________
4.3.1
TABLE OF COMMANDS
Command
G1
G2
G3
G4
Description
Gain set to 1
Gain set to 10
Gain set to 100
Gain set to 1000
IC1
IC2
IC3
IC4
Input Coupling set to OFF (both grounded)
Input Coupling set to SE + (- grounded)
Input Coupling set to SE - (+ grounded)
Input Coupling set to Diff (both on)
SR1
SR2
SR3
SR4
SR5
Shunt Resistor set to Open
Shunt Resistor set to 50 Ohms
Shunt Resistor set to 500 Ohms
Shunt Resistor set to 5k Ohms
Shunt Resistor set to 50k Ohms
CP1
CP2
Coupling set to AC
Coupling set to DC
BW1
BW2
Bandwidth Filter OFF
Bandwidth Filter ON 100kHz (Std),
400Hz with option 11 installed
S
Setup Query current settings
4.3.2
COMMAND STRING EXAMPLES
Example1: ch2,g2,ic2,sr1,cp1,bw1(CRLF)
This sets channel 2 to a gain of 10, + input BNC on, no shunt resistor connected, input set to AC
coupling, and full bandwidth (no low pass filter).
Example 2:AL;G4(CRLF)
This sets all channels to a gain of 1000.
Example 3:CH4;S(CRLF)
This query channel 4 to see the current setting. Reply example: CH4;G4;CP2;BW1;IC1;SR2
34
Section 4 - USB-Com Option
________________________________________________________________________________
4.3.3
REPSONSE TO A COMMAND STRING
After receiving a string, the Model 7008 will send a response code back.
The responses are:
7008 Response
*A
*B
*C
*D
Description of Response
Data Ok, No errors
Data Error
Syntax Error
7008 in Local Mode
A data error is caused by sending incorrect data, such as “G7” for a Gain setting. If you get a syntax
error, check that the delimiter is either a comma “,” or a colon “;”. The “7008 in Local Mode” error
informs you that you need to press the “Local/Remote” key to place the 7008 in remote mode.
35
Section 5 - LAN-Com Option
_________________________________________________________________________________
SECTION 5
LAN-COM OPTION
(for Remote Programming)
5.1
INTRODUCTION
The Model 7008 has the ability to be remotely controlled by installing the LAN-COM option. With
the LAN-COM option, the Model 7008 can be remotely controlled via the LAN connection from your
computer. It gives the user full control of all parameters over the LAN Bus. The following
information will give suggested steps to get quickly started connecting, configuring and using the
7008 on a LAN connection directly to your PC.
5.1.1
SITE LANs AND PRIVATE LANs
The LAN-COM option is a local area network (LAN) in which LAN-enabled instruments and Windows
PCs are connected through a site LAN (workgroup LAN, Intranet, or Enterprise LAN) via a router,
hub, or switch. A Private LAN is a local area network in which LAN-enabled instruments and
Windows PCs are NOT connected to a site LAN.
5.1.2
CONNECTING THROUGH A NETWORK
To use the Model 7008 through a network, the LAN-COM option must be installed and a straight
through CAT5e cable must be used to connect the 7008 to the network. The remote control setting
of the 7008 must also be set to LAN from the Port Selection Menu. The default setting for the IP
address is set to obtain the address via DHCP. Connect the 7008 to the network and turn it on. After
a moment, your DHCP (Dynamic Host Configuration Protocol) server should assign a valid address
automatically. Start HyperTerminal and configure it if needed.
5.1.3
CONNECTING DIRECTLY TO THE MODEL 7008 (no network)
To use the Model 7008 directly connected to a computer and not through a network, a crossover
CAT5e cable must be used to connect the 7008 to the network card of the computer. Connect the
7008 directly to the network first and then power it on. After a moment, your computer should
assign an IP address to the Model 7008, if it is set to obtain IP addresses automatically (default
setting). Use the supplied LANScan program if needed to find the IP address of the local computer or
the Model 7008. See Section 4.2.2 for using Hyper Terminal to communicate with the 7008.
NOTE: The remote control setting of the 7008 must also be set to
LAN from the Port Selection Menu (see Section 4.2.).
5.1.4
HOW TO FIND THE CURRENT IP ADDRESS
Connect the correct network cable to the Model 7008 before turning the 7008 on. For a direct
connection setup, use a CAT5e Crossover Cable. Otherwise use a Standard Cat5e Straight Cable.
36
Section 5 - LAN-Com Option
________________________________________________________________________________
Run the Krohn-Hite supplied LANScan program. This program will scan your local network to find the
current IP Address of all the 7008’s. This is a stand-alone program that will run from a flash drive or
the Krohn-Hite Manual CD that was packed with the 7008.
Upon starting the program, the following window displays in the figure below. Click Run. The
program displays its main window.
Figure 5.1 - Security Warning Screen
The window shown in Figure 4.19 is the opening window for the LANScan program.
Figure 5.2 - Xport Scan Screen
In this example, the computer running the LANScan program has an IP address of 192.168.1.103.
Click the Search button near the bottom of the window to start scanning. The figure below shows
the results of the scan.
37
Section 5 - LAN-Com Option
_________________________________________________________________________________
Figure 5.3 - Xport Scan Results Screen
In this example, there is one 7008 with an IP Address of 192.168.1.117. If more than one 7008 is on
the network, you can use the MAC Address to identify the calibrator of interest.
5.1.5
SETTING A FIXED IP ADDRESS
First, connect the correct network cable to the model 7008 before turning the 7008 on. For a direct
connection setup, use a CAT5e Crossover Cable, otherwise use a standard CAT5e Straight-Through
Cable.
Run the LANScan program to find the current IP address of the 7008.
NOTE: LANScan is provided on the CD that came with the 7008, or it can be found on our web site
home page www.krohn-hite.com located under Software.
Once the IP address is found, using a browser like Internet Explorer, type in the 7008 address in the
address bar.
A dialog box will appear prompting for a User name and Password (see Figure 5.4). If no password
has been defined (default) then leave both fields blank and click "OK". If a password has been
defined, leave the username blank, type in the password, and click "OK".
38
Section 5 - LAN-Com Option
________________________________________________________________________________
Figure 5.4 - Tera Terminal New Connection Screen
After the Security box information has been entered, the Device Server Configuration Manager will
display.
Figure 5.5 - Device Server Configuration Manager Screen
On the main menu in the left side of
the window, click Network (highlighted
in red above) and the following page
will display.
39
Section 5 - LAN-Com Option
_________________________________________________________________________________
Figure 5.6 - Network Settings Screen
Click on the Use the following IP configuration radio button (highlighted in the red above).
Enter the IP address, Subnet mask and Default gateway (the gateway parameter is optional) you
want to assign to the 7008. Typical subnet for most local networks would be (255.255.255.0). Then
click "OK" (highlighted in red below) at the bottom of the window.
Assign address 192.168.1.147 with a subnet Mask of 255.255.255.0.
Figure 5.7 - Network Settings Screen
On the main menu in the left side, click Apply Settings (highlighted red below). After about five
seconds the window will inform you that the 526 LAN is rebooting in order to apply the settings.
40
Section 5 - LAN-Com Option
________________________________________________________________________________
Figure 5.8 - IP Configuration Screen
Close the browser when done.
5.1.6
LAN and HyperTerminal Setup
When connecting the 7008 to a network or computer directly, check the communication port
setting of the 7008. Change the setting for LAN operation.
In order to use the Krohn-Hite Model 7008 with LAN, you must decide if the connection is made
through a network or direct. A CAT5e Straight-Through Cable must be used for a network
connection and a CAT5e Crossover Cable if connecting directly to the Model 7008.
5.1.7
How to Set-Up and Run Windows™ HyperTerminal
Windows™ HyperTerminal can be used to program the Krohn-Hite Model 7008 using the LAN
connection. Once you have made the LAN connection via a network or directly to the 7008, do the
following:
Click on
START then,
ALL PROGRAMS then,
ACCESSORIES then,
COMMUNICATIONS then,
HYPER-TERMINAL.
This will execute the HyperTerminal Program.
Enter 7008 in the Name box (not 526), then click on "OK".
41
Section 5 - LAN-Com Option
_________________________________________________________________________________
Figure 5.9 - Connection Screen
Now in the Connect Using box, change the COM1 to TCP/IP.
Figure 5.10 - Connect To Screen
The window will change.
42
Section 5 - LAN-Com Option
________________________________________________________________________________
Figure 5.11 - New Connect To Screen
Enter the Host Address (address of the Model 7008).
Enter the Port Number 10027 (7008 default port).
Click "OK".
Hyper-Terminal will now open.
Click on "File", then "Properties”.
Click on “Settings” tab.
Click on “Windows keys” under Function, arrow and ctrl keys act as.
Click on the Emulation arrow and select "VT100".
Click on “ASCII Setup”.
Select "Send line ends with line feeds".
Select "Echo typed character locally".
Click "OK" to close the ASCII setup box.
Click "OK" to close the Properties Box window.
Communications should now be available.
Now verify that the communications is established by typing in “*IDN?” and press enter. If there is
communication, the Model 7008 will return the installed firmware version string, similar to the
example below:
KROHN-HITE 7008, VER 1.2
43
Section 6 – Removing and Installing Preamplifier Cards
_________________________________________________________________________________
SECTION 6
REMOVING AND INSTALLING PREAMPLIFIER CARDS
6.1
INTRODUCTION
The information following will describe how to remove and install a 700 Amplifier Card into the
chassis of the 7008. Precautions should be taken when the covers are removed.
If the Model 7008 is not working properly, has failed or needs calibration, call the Krohn-Hite Service
Department at 508-580-1660 for an RMA (Return Material Authorization) number. Affix a label to
the outside of the box with the following information:
Krohn-Hite Corporation
Attn: Service Department RMA ####
15 Jonathan Drive, Unit 4
Brockton, MA 02301-5566
Costs for repair and calibration can be found on our web site www.krohn-hite.com, or you can call
the Service Department for the information directly.
6.2
REMOVING A MODEL 700 PREAMPLIFIER CARD
To remove a Model 700 card from the 7008 chassis, you need to first detach the power cord from
the unit. Now remove the top cover by removing the top cover screws. Once the cover is removed,
you will have exposed the Model 700 Preamplifer cards, USB or LAN card, Power Supply card and
Display card.
Display
Card
700
Preamplifer
Cards
Power
Supply
Card
USB
Card
Figure 6.1 – 7008 with Top Cover Removed
44
Section 6 – Removing and Installing Preamplifier Cards
________________________________________________________________________________
WARNING
Before removing any preamplifier cards from the chassis, be aware that
they have been set with an address at the factory indicating the slot position
in the chassis. Do not mix up the order in which the cards are installed, or
the cards will not communicate with the firmware resulting in the card
indicating NO CHANNEL.
Remove nuts and
lock washers for
each connector on
the channel that is
being removed.
Figure 6.2 – Input/Output BNC Connections
Now looking at the front panel, remove the three BNC nuts and washers from the both the input
and output connectors from the channel being removed. Be careful not to scratch the panel when
doing this.
Remove Connectors
on Preamplifier Card
Figure 6.3 – Rear View of Preamplifier Cards
45
Section 6 – Removing and Installing Preamplifier Cards
_________________________________________________________________________________
Now remove the connectors at the rear of the card of the channel being removed. Gently lift the
card up at the rear, pull back towards the rear panel to clear the Card Guide that holds the
preamplifier cards in place, and lift the card out, clearing the front panel BNC holes.
Preamplifier
Card Guide
Figure 6.4 – Preamplifier Cards
6.3
INSTALLING THE MODEL 700 PREAMPLIFIER CARD
Installing the Model 700 Preamplifier Card can be simply done by reversing the order of Paragraph
6.2.
46
Section 6 – Removing and Installing Preamplifier Cards
________________________________________________________________________________
47
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