Tabor Electronics 9250 User manual
User Manual
Model 9250
Dual Channel/Differential
Power Amplifier
Publication No. 041210
Tabor Electronics Ltd.
Tabor Electronics Ltd.
P.O. Box 404, Tel Hanan Israel 20302
Tel: +972-4-821-3393, FAX: +972-4-821-3388
PUBLICATION DATE: December 10, 2004
Copyright 2003 by Tabor Electronics Ltd. Printed in Israel. All rights reserved. This book or parts thereof may
not be reproduced in any form without written permission of the publisher.
WARRANTY STATEMENT
Products sold by Tabor Electronics Ltd. are warranted to be free from defects in workmanship or materials.
Tabor Electronics Ltd. will, at its option, either repair or replace any hardware products which prove to be de-
fective during the warranty period. You are a valued customer. Our mission is to make any necessary repairs
in a reliable and timely manner.
Duration of Warranty
The warranty period for this Tabor Electronics Ltd. hardware is three years, except software and firmware
products designed for use with Tabor Electronics Ltd. Hardware is warranted not to fail to execute its pro-
gramming instructions due to defect in materials or workmanship for a period of ninety (90) days from the
date of delivery to the initial end user.
Return of Product
Authorization is required from Tabor Electronics before you send us your product for service or calibration.
Call your nearest Tabor Electronics support facility. A list is located on the last page of this manual. If you are
unsure where to call, contact Tabor Electronics Ltd. Tel Hanan, Israel at 972-4-821-3393 or via fax at 972-4-
Limitation of Warranty
Tabor Electronics Ltd. shall be released from all obligations under this warranty in the event repairs or modifi-
cations are made by persons other than authorized Tabor Electronics service personnel or without the written
consent of Tabor Electronics.
Tabor Electronics Ltd. expressly disclaims any liability to its customers, dealers and representatives and to
users of its product, and to any other person or persons, for special or consequential damages of any kind
and from any cause whatsoever arising out of or in any way connected with the manufacture, sale, handling,
repair, maintenance, replacement or use of said products.
Representations and warranties made by any person including dealers and representatives of Tabor Elec-
tronics Ltd., which are inconsistent or in conflict with the terms of this warranty (including but not limited to the
limitations of the liability of Tabor Electronics Ltd. as set forth above), shall not be binding upon Tabor Elec-
tronics Ltd. unless reduced to writing and approved by an officer of Tabor Electronics Ltd.
Except as stated above, Tabor Electronics Ltd. makes no warranty, express or implied (either in fact or by
operation of law), statutory or otherwise; and except to the extent stated above, Tabor Electronics Ltd. shall
have no liability under any warranty, express or implied (either in fact or by operation of law), statutory or oth-
erwise.
PROPRIETARY NOTICE
This document and the technical data herein disclosed, are proprietary to Tabor Electronics, and shall not, without express
written permission of Tabor Electronics, be used, in whole or in part to solicit quotations from a competitive source or used
for manufacture by anyone other than Tabor Electronics. The information herein has been developed at private expense,
and may only be used for operation and maintenance reference purposes or for purposes of engineering evaluation and
incorporation into technical specifications and other documents, which specify procurement of products from Tabor Elec-
tronics.
FOR YOUR SAFETY
Before undertaking any troubleshooting, maintenance or exploratory procedure, read care-
fully the WARNINGS and CAUTION notices.
This equipment contains voltage hazardous
to human life and safety, and is capable of
inflicting personal injury.
If this instrument is to be powered from the AC line (mains) through an auto-
transformer, ensure the common connector is connected to the neutral (earth
pole) of the power supply.
Before operating the unit, ensure the conductor (green wire) is connected to
the ground (earth) conductor of the power outlet. Do not use a two-conductor
extension cord or a three-prong/two-prong adapter. This will defeat the pro-
tective feature of the third conductor in the power cord.
Maintenance and calibration procedures sometimes call for operation of the
unit with power applied and protective covers removed. Read the procedures
and heed warnings to avoid “live” circuit points.
Before operating this instrument:
1. Ensure the proper fuse is in place for the power source to operate.
2. Ensure all other devices connected to or in proximity to this instrument are properly
grounded or connected to the protective third-wire earth ground.
If the instrument:
- fails to operate satisfactorily
- shows visible damage
- has been stored under unfavorable conditions
- has sustained stress
Do not operate until, performance is checked by qualified personnel.
DECLARATION OF CONFORMITY
We: Tabor Electronics Ltd.
9 Hatasia Street, Tel Hanan
ISRAEL 36888
declare, that the 40Vp-p Signal Amplifier
Model 9250
meet the intent of Directive 89/336/EEC for Electromagnetic Compatibility and the
requirements of the Low Voltage Directive 73/23/EEC amended by 93/68/EEC.
Compliance was demonstrated to the following specifications as listed in the official
Journal of the European Communities:
Safety:
IEC/EN 61010-1 2nd Edition:2001+ C1, C2
EMC:
EN 50081-1 Emissions:
EN 55022 - Radiated, Class B
EN 55022 - Conducted, Class B
EN 50082-1 Immunity:
IEC 801-2 (1991) - Electrostatic Discharge
IEC 801-3 / ENV50140 (1993) - RF Radiated
IEC 801-4 (1991) - Fast Transients
The tests were performed on a typical configuration.
Table of Contents
Chapter 1 - PORTRAYAL
What’s in This Chapter .........................................................................................................................................1-1
Introduction.............................................................................................................................................................1-2
9250Feature Highlights ........................................................................................................................................1-3
Conventions Used in this Manual .......................................................................................................................1-3
Functional ...............................................................................................................................................................1-4
Description..............................................................................................................................................................1-4
Configuration Options ...........................................................................................................................................1-4
Specifications .........................................................................................................................................................1-5
Front Panel.............................................................................................................................................................1-5
Connectors .............................................................................................................................................................1-5
Channel 1 Input .....................................................................................................................................................1-5
Channel 2 Input .....................................................................................................................................................1-6
Channel 1 Output ..................................................................................................................................................1-6
Channel 2 Output ..................................................................................................................................................1-7
Front Panel.............................................................................................................................................................1-8
Indicators ................................................................................................................................................................1-8
Rear Panel Parts and Connectors ......................................................................................................................1-8
Line Receptacle and Fuse ...................................................................................................................................1-9
Auxiliary Inputs Channel 1 ...................................................................................................................................1-9
Auxiliary Inputs Channel 2 .................................................................................................................................1-10
Differential Outputs Switch.................................................................................................................................1-10
Grounding Considerations .................................................................................................................................1-10
Operating ..............................................................................................................................................................1-11
Instructions ...........................................................................................................................................................1-11
Chapter 2 - INSTALLATION
Installation Overview.............................................................................................................................................2-1
Unpacking and Initial Inspection .........................................................................................................................2-1
Safety Precautions ................................................................................................................................................2-2
Performance Checks ............................................................................................................................................2-3
Operating Environment.........................................................................................................................................2-3
Power Requirements ............................................................................................................................................2-3
Grounding Requirements .....................................................................................................................................2-4
Long Term Storage or Repackaging for Shipment ..........................................................................................2-4
Preparation for Use ...............................................................................................................................................2-5
Installation...............................................................................................................................................................2-5
Factory Configuration of the 9250 Settings .......................................................................................................2-5
Field Configuration of the 9250 Settings............................................................................................................2-6
ii
Chapter 3 - MAINTENANCE, PERFORMANCE CHECKS and ADJUSTMENTS
What’s in This Chapter..........................................................................................................................................3-2
Disassembly Instructions......................................................................................................................................3-2
Special Handling of Static Sensitive Devices ....................................................................................................3-3
Cleaning..................................................................................................................................................................3-4
Repair and Replacement......................................................................................................................................3-4
Performance Checks.............................................................................................................................................3-5
Environmental Conditions ....................................................................................................................................3-5
Warm-up Period.....................................................................................................................................................3-5
9250Configuration for the Tests..........................................................................................................................3-5
Recommended Test Equipment..........................................................................................................................3-5
Performance Check Procedures .........................................................................................................................3-6
Input/Output Impedance .......................................................................................................................................3-6
Test Results............................................................................................................................................................3-6
Gain Accuracy........................................................................................................................................................3-6
Test Results............................................................................................................................................................3-7
Test Results............................................................................................................................................................3-7
Test Results............................................................................................................................................................3-7
Square wave Characteristics ...............................................................................................................................3-7
Test Results............................................................................................................................................................3-8
Output Distortion....................................................................................................................................................3-8
Test Results............................................................................................................................................................3-8
Output Spectral Purity...........................................................................................................................................3-9
Adjustments..........................................................................................................................................................3-10
Introduction...........................................................................................................................................................3-10
Environmental Conditions ..................................................................................................................................3-10
Required Equipment ...........................................................................................................................................3-10
Adjustment Procedures ......................................................................................................................................3-11
CH1 Low Frequency Response.........................................................................................................................3-11
CH2 Low Frequency Response.........................................................................................................................3-11
CH1 High Frequency Response........................................................................................................................3-12
CH2 Low Frequency Response.........................................................................................................................3-12
Channel 1, Auxiliary Offset Adjustment............................................................................................................3-13
Channel 2, Auxiliary Offset Adjustment............................................................................................................3-13
Appendix A - SPECIFICATIONS ................................................................................................................. A-1
iii
List of Figures
Figure 1 1, The Model 9250.................................................................................................................................1-3
Figure 1 2, The 9250 Rear Panel........................................................................................................................1-8
Figure 2 1, Field Modification of Channel 1 Input Impedance ........................................................................2-7
List of Tables
Table 2 1, Input Impedance Jumpers.................................................................................................................2-7
Table 2 2, Output Impedance Jumpers..............................................................................................................2-7
Table 2 3, Input coupling Jumpers......................................................................................................................2-8
Table 2 4, Output coupling Jumpers...................................................................................................................2-8
Table 3 1, Recommended Test Equipment.......................................................................................................3-5
Table 3 2 , Square wave Characteristics Tests ................................................................................................3-7
Table 3 3, Output Distortion Tests ......................................................................................................................3-8
Table 3 4, Front Panel Sine wave Spectral Purity Test ...................................................................................3-9
Table 3 5, Required Equipment.........................................................................................................................3-10
iv
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Chapter 1
PORTRAYAL
What’s in This
Chapter
This chapter contains general and functional description of the
Model 9250 dual/differential wideband power amplifier. It also
describes the front and rear panel connectors and its operational
modes. It also and provides description of all features available with
the instrument.
Introduction The Model 9250, as shown in Figure 1-1, is a bench-top, 2U, half
19” rack size, fully metal case dual channel amplifier. The
instrument can be configured to be used as two, single-ended
independent channels, or as a one input with two differential
outputs.
The inputs to the amplifiers be configured to match different source
impedances such as 50Ω, 75Ω, or 1MΩand the outputs can be
configured to match different load impedances such as 50Ω, 75Ω,
or 600Ω.
There are three inputs for each channel:
1. Main input. This input is located on the front panel is normally
be used for signal inputs.
2. Auxiliary input. This input is located on the rear panel and can
be used as a summing input.
3. DC Offset input. This input is also located on the rear panel and
can be used for offsetting the signal level within the specified
output level window.
The outputs are located on the front panel. There are two outputs,
one for each channel. When the 9250 is configured as two
separate amplifiers, the outputs generate amplified signals within
the range of 40Vp-p into open circuit or 20Vp-p into matching load
impedance. The bandwidth of the outputs is around 20MHz for
large signals. Small signal bandwidth can reach 50MHz.
The 9250 can be configured as a differential amplifier. In this case,
the channel 2 input is disabled and channel 1 input is amplified and
distributed differentially to both outputs. In this case, channel 1
output generates in-phase signal while channel 2 outputs an
User Manual 9250
1-2 Portrayal
inverted signal that has exactly 180°phase offset to the normal
output. Full amplitude and bandwidth is preserved when the 9250
operates in differential mode. The output impedance of the
differential outputs is modified to 25Ω, 37.5Ω, or 300Ωfor
differential drive of 50Ω, 75Ω, or 600Ωloads. Using the differential
mode, the 9250 does not sacrifice accuracy, nor does it sacrifice
bandwidth.
The 9250 has two additional inputs for each channel allowing
summation of two signals and providing an external control of DC
level offset. These inputs are accessible from the rear panel only.
9250 Feature
Highlights
•Bench-top, all metal case
•Large signal bandwidth to 20 MHz
•Small signal bandwidth to 50 MHz
•High amplitude to 40Vp-p (high impedance)
•Low distortion
•Custom Configuration of:
Gain
Input Impedance
Output Impedance
Output configuration – single ended or differential
Conventions
Used in this
Manual
The following symbols may appear in this manual:
Note
A Note contains information relating to the use of this product
TIP
A Tip contains information relating to the performance of this product
Caution
A Caution contains information that should be followed to avoid personal
damage to the instrument or the equipment connected to it.
Warning
A Warning alerts you to a potential hazard. Failure to adhere to the
statement in a WARNING message could result in personal injury.
User Manual 9250
Portrayal 1-3
Figure 1-1, The Model 9250
Functional
Description
Detailed functional description of the features, operation and
options available with the 9250 is given in the following paragraphs.
The wideband amplifier can be ordered with different configurations
such as input/output impedance, gain, etc. Therefore read the
following description carefully and make sure your amplifier is
configured correctly for your application before you connect the
cables to your circuits.
Configuration
Options
The Model 9250 must be ordered from the factory already
configured for your application. This manual has no schematics and
no instructions how to modify the amplifier for other configurations
as any configuration change, without full engineering supervision,
may affect the performance of the amplifier. Below, you’ll find a list
of optional configurations for the amplifier:
Basic Configuration – defines if the 9250 will operate as two
single-ended and independent amplifiers, or as single input with
differential outputs.
Input Impedance – determines the matching source impedance at
the input connectors. Three options are available: 50Ω, 75Ωand
User Manual 9250
1-4 Portrayal
1MΩ. Input impedance can be configured for the front panel main
inputs and for the rear panel auxiliary inputs.
Output Impedance – determines the matching load impedance at
the output connectors. Three options are available: 50Ω, 75Ωand
600Ω.
Gain – specifies gain magnitude of the input signal. Factory default
setting is 10. Custom gain can also be specified. Note that some
characteristics of the output section may change for gain setting
above 10.
As explained above, all options must be specified at the time of
your purchase and the 9250 is supplied fully configured.
Reconfiguration of fielded instruments can be done by qualified and
trained persons only.
Specifications Instrument specifications are listed in Appendix A. These
specifications are the performance standards or limits against
which the instrument is tested. Specifications apply under the
following conditions: output terminated into matching impedance,
after 30 minutes of warm up time, and within a temperature range
of 20°C to 30°C. Specifications outside of the temperature range
are degraded by 0.1% per °C.
Front Panel
Connectors
The 9250 has 4 BNC connectors on its front panel, two for each
channel. Two are marked INPUT and the other two are marked
OUTPUT. These connectors are described below.
Channel 1 Input The input connector accepts signals within the range of DC to over
20 MHz and amplifies them by a fixed gain. The gain is normally
x10 however, this number may be different if you ordered the
amplifier with different gain setting. Input impedance is factory pre-
conditioned and has one of the following values: 50Ω, or 1MΩ.
1MΩinput impedance can be used for low frequency signals (up to
100kHz) however, higher frequencies require 50Ωtermination at
the input of the amplifier to eliminate standing waves and
reflections in the input cable, which can cause excessive ringing
and aberrations at the output.
The amplifier input can not tolerate high voltage on its 50Ω
resistance. Therefore, before applying the cable to the input
connector, make sure your signal will not exceed input rating, as
specified in Appendix A of this manual.
User Manual 9250
Portrayal 1-5
Note
Channel 1 Input only is used when the Model 9250
is configured to operate in differential mode.
Channel 2 Input This input connector accepts signals within the range of DC to over
20 MHz and amplifies them by a fixed gain. The gain is normally
x10 however, this number may be different if you ordered the
amplifier with different gain setting. Input impedance is factory pre-
conditioned and has one of the following values: 50Ω, or 1MΩ.
1MΩinput impedance can be used for low frequency signals (up to
100kHz) however, higher frequencies require 50Ωtermination at
the input of the amplifier to eliminate standing waves and
reflections in the input cable, which can cause excessive ringing
and aberrations at the output.
The amplifier input can not tolerate high voltage on its 50Ω
resistance. Therefore, before applying the cable to the input
connector, make sure your signal will not exceed input rating, as
specified in Appendix A of this manual.
Note
Channel 2 Input is disabled when the 9250 is
configured to operate in differential output mode.
Channel 1 Output The channel 1 output connector outputs amplified signals. When
the 9250 is configured as two separate amplifiers, this output
connector generates amplified signals that are applied to the
channel 1 input connector. If the instrument is configured for
differential output, this channel generates normal, non-inverted
signals while the other output connector generates the inverted
signal at 180°phase offset.
Gain at this output is fixed at 10 (or another gain factor that was
specified at the time of your purchase). Output source impedance
is one of: 50Ω, 75Ωor 600Ω.
Tip
Knowing your source impedance is very important
because the output gain accuracy is calibrated to
specific source impedance and therefore, any
unmatched load impedance may have an affect on
User Manual 9250
1-6 Portrayal
output level accuracy. For example, with properly
terminated signals at the input and output
connectors (say 50Ωeach), an input of 2Vp-p will
generate an output of 20Vp-p. On the other hand, if
you increase your load impedance by a large
factor, the output will increase by a factor of:
Vout = 40Vp-p - 40Vp-p x 50Ω/ (50Ω+XΩ)
where X = your load impedance
If you look at the equation above, with exactly 50Ω
load impedance, the output will be 20Vp-p and as
you increase the load impedance, the output
increases proportionally until, at very high load
impedance, the output is doubled to 40Vp-p.
40Vp-p is the maximum amplitude level this amplifier can produce
however, only into high impedance loads.
WARNING
Applying the output signal on inductive or
capacitive loads may damage the amplifier.
Channel 2 Output The channel 2 output connector outputs amplified signals. When
the 9250 is configured as two separate amplifiers, this output
generates amplified signals that are applied to the channel 2 input
connector. If the instrument is configured for differential output, this
channel generates an inverted signal at 180°phase offset while
channel 1 output generates the normal, non-inverted.
Gain at this output is fixed at 10 (or another gain factor that was
specified at the time of your purchase). Output source impedance
is one of: 50Ω, 75Ωor 600Ω.
Tip
Knowing your source impedance is very important
because the output gain accuracy is calibrated to
specific source impedance and therefore, any
unmatched load impedance may have an affect on
output level accuracy. For example, with properly
terminated signals at the input and output
connectors (say 50Ωeach), an input of 2Vp-p will
User Manual 9250
Portrayal 1-7
generate an output of 20Vp-p. On the other hand, if
you increase your load impedance by a large
factor, the output will increase by a factor of:
Vout = 40Vp-p - 40Vp-p x 50Ω/ (50Ω+XΩ)
where X = your load impedance
If you look at the equation above, with exactly 50Ω
load impedance, the output will be 20Vp-p and as
you increase the load impedance, the output
increases proportionally until, at very high load
impedance, the output is doubled to 40Vp-p.
40Vp-p is the maximum amplitude level this amplifier can produce
however, only into high impedance loads.
WARNING
Applying the output signal on inductive or
capacitive loads may damage the amplifier.
Front Panel
Indicators
The 9250 has 2 indicators on its front panel. The POWER LED will
light as soon as you press the switch to power up the 9250. An
illuminated power light designates power is applied to the
instrument and you should expect to have signal at its output
connector(s).
An LED at the center of the front panel is marked Differential ON.
When this light is on, channel 2 input is disabled and signal applied
to the channel 1 input is routed to both channel 1 and channel 2
outputs, except the signal is now differential. The differential mode
is selected with a rear panel switch.
Rear Panel Parts
and Connectors
The rear panel is rarely used for normal operation however, there
are some connections you must do before you can operate the
amplifier for example, connecting the mains power to the
instrument. There are other connectors and parts on the rear panel;
These are discussed in the following paragraphs. Refer to Figure 1-
2 throughout the following description.
User Manual 9250
1-8 Portrayal
Figure 1-2, The 9250 Rear Panel
Line Receptacle and
Fuse
Power is connected to the 9250 through the line receptacle. The
amplifier accepts any voltage from 80 to 265Vac and there is no
need to select the voltage range between different countries.
Instructions how to connect the line cord and how to replace the
line fuse is given in Chapter 2. If a fuse blows, make sure you
replace it with the same type and rating to avoid possible damage
to the product from unsuitable fuse value.
Auxiliary Inputs
Channel 1
There are two Channel 1 auxiliary inputs on the rear panel marked
INPUT and OFFSET.
The INPUT connector can be used as summing input to the front
panel signal. It also can be used as the main input if connectors are
available on the back only. However, the output is always from the
front panel connectors. Observe the input limitations as specified in
Appendix A to avoid damage to the amplifier circuit.
The OFFSET connector is used for dc signals only. Use this input
to offset your signal to any direction, positive or negative however,
always observe the positive and negative rail limitations as
specified in Appendix A to avoid damaging the amplifier circuits.
With normal configuration, this input is used for driving the front
panel output for channel 1 only. When the 9250 is configured for
differential outputs, channel 2 auxiliary inputs are disabled and only
channel 1 signal is amplified.
User Manual 9250
Portrayal 1-9
Auxiliary Inputs
Channel 2
There are two Channel 2 auxiliary inputs on the rear panel marked
INPUT and OFFSET.
The INPUT connector can be used as summing input to the front
panel signal. It also can be used as the main input if connectors are
available on the back only. However, the output is always from the
front panel connectors. Observe the input limitations as specified in
Appendix A to avoid damage to the amplifier circuit.
The OFFSET connector is used for dc signals only. Use this input
to offset your signal to any direction, positive or negative however,
always observe the positive and negative rail limitations as
specified in Appendix A to avoid damaging the amplifier circuits.
With normal configuration, this input is used for driving the front
panel output for channel 2 only. When the 9250 is configured for
differential outputs, these inputs are disabled and only channel 1
signal is amplified.
Differential Outputs
Switch
The Differential Outputs switch has two actions. In normal mode, it
separates between the two channels so each channel can be used
separately. In Differential Mode, this switch disables channel 2 inputs
and converts the internal circuits to output differential signals.
Channel 1 is used for outputting the normal output and channel 2 is
used for outputting the inverted signal. When this switch is
depressed, the front panel led illuminates, designating that the
differential mode has been selected.
Grounding
Considerations
Understanding how to connect your ground path could be critical to
preserving the integrity of your output signal. If you are using a single-
ended output then it will probably be safe for you to connect the
circuit ground to case ground. Always bear in mind the following
warning:
WARNING
Input and output grounds are tied together to case
ground and therefore, it is absolutely forbidden to
connect the output ground to a different level than
the input ground. Failure to adhere to this
limitation may damage the 9250 and the
surrounding equipment connected to its I/O
connectors.
User Manual 9250
1-10 Portrayal
Operating
Instructions
Being a passive device, there are no controls, nor compute
r
programming required to operate the Model 9250. The following
procedure is recommended for proper operation of the powe
r
amplifier:
1. Make sure your box is configured for input and output
impedance and gain
2. Follow the installation instructions given in Chapter 2 of this
manual
3. Connect the output terminal to your load
4. Connect the input terminal to your source
5. Turn on power to your 9250
WARNING
There is no switch control to turn 9250
amplification on and off and therefore, the
amplifier is active immediately after you power it
up. Always make sure your load is protected from
inadvertent power up conditions before you turn
on your 9250.
Chapter 2
CONFIGURING the INSTRUMENT
Installation
Overview
This chapter contains information and instructions necessary to
prepare the Model 9250 for operation. Details are provided for initial
inspection, grounding safety requirements, repackaging instructions
for storage or shipment, installation information and Ethernet address
configuration.
Unpacking and
Initial Inspection
Unpacking and handling of the generator requires normal precautions
and procedures applicable to handling of sensitive electronic
equipment. The contents of all shipping containers should be checked
for included accessories and certified against the packing slip to
determine that the shipment is complete.
Safety Precautions The following safety precautions should be observed before using
this product. Although some instruments and accessories would
normally be used with non-hazardous voltages, there are situations
where hazardous conditions may be present.
CAUTION
This product is intended for use by qualified persons
who recognize shock hazards and are familiar with the
safety precautions required to avoid possible injury.
Read the operating information carefully before using
the product.
Exercise extreme caution when a shock hazard is present. Lethal
voltage may be present on power cables, connector jacks, or test
fixtures. The American National Standard Institute (ANSI) states that a
shock hazard exists when voltage levels greater than 30V RMS,
42.4V peak or 60 VDC are present.
User Manual 9250
2-2 Portrayal
WARNING
For maximum safety, do not touch the product, test ca-
bles, or any other instrument parts while power is ap-
plied to the circuit under test. ALWAYS remove power
from the entire test system before connecting cables or
jumpers, installing or removing cards from the com-
puter, or making internal changes such as changing the
module address.
Do not touch any object that could provide a current
path to the common side of the circuit under test or
power line (earth) ground. Always keep your hands dry
while handling the instrument.
When using test fixtures, keep the lid closed while power is applied to
the device under test. Carefully read the Safety Precautions
instructions that are supplied with your test fixtures.
Before performing any maintenance, disconnect the line cord and all
test cables. Only qualified service personnel should perform
maintenance.
Performance
Checks
The instrument has been inspected for mechanical and electrical
performance before shipment from the factory. It is free of physical
defects and in perfect electrical order. Check the instrument fo
r
damage in transit and perform the electrical procedures outlined in the
section entitled Unpacking and Initial Inspection.
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