Agilent Technologies 1141A Manual

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User and Service Guide
Publication number 01141-97002
July 2004
For Safety and Regulatory information, see the pages at the end
of this book.
© Copyright Agilent Technologies 2000-2004
All Rights Reserved
Agilent Technologies 1141A
Differential Probe and 1142A
Probe Control and Power
Module
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2
Agilent Technologies 1141A Differential Probe and
1142A Probe Control and Power Module
This manual contains information for use and service of the differential
probe system, the 1141A Differential Probe and 1142A Probe Control
and Power Module. In this document, the two models will be treated as
a system.
Each of the two instrument models that make up the differential probe
system has a serial number sticker. The sticker for the 1141A
Differential Probe is inside the probe, in the bottom cover. (See
chapter 3 for disassembly procedure.)
The 1141A/1142A probe system allows measurement of small
differential signals in the presence of much larger common-mode
signals. It has the following major features:
• 200 MHz bandwidth
• Variable offset
• dc reject
• ac coupling
• Remote operating capability
The variable offset capability can be used to measure small ac signals in
the presence of much larger dc levels. Remote operation of key
features allows the use of the probe system in automatic test situations.
The probe can be used with an oscilloscope, spectrum analyzer, or any
instrument where differential probing is required and a compatible
50 Ωinput is available.
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Contents
3
1 Operating the Probe
Accessories Supplied 6
Accessories Available 8
To inspect the probe 9
Using the probe with other instruments 9
Recommended Test Equipment 9
2 Calibration Tests and Adjustment
Equipment Required 26
The Test Board 26
Calibration Tests 27
dc Gain Accuracy 28
Bandwidth 34
CMRR Test 36
Calibration Test Record 39
Adjustments 40
Probe Adjustment 40
Adjustment Procedure 42
Attenuator Adapter Adjustment 49
3Service
Introduction 54
Performance Specifications and Characteristics 55
General Characteristics 58
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4
Contents
Theory of Operation 59
Differential Probe 60
Control and Power Module 60
Attenuator Adapters 61
Test Board 62
Service Policy 63
Troubleshooting 64
Probe Troubleshooting 64
Probe Control and Power Module Troubleshooting 64
Removing and Replacing Assemblies 66
Differential Probe 66
Probe Adapters 68
Probe Control and Power Module 70
Replaceable Parts 71
Parts List 71
Ordering Information 71
Direct Mail Order System 71
Manufacturers’ Codes 72
Exploded View 73
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5
1
Operating the Probe
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6
Operating the Probe
Accessories Supplied
Introduction
This chapter shows you how to connect and operate the 1141A
Differential Probe and 1142A Probe Control and Power Module as a
differential probe system.
Accessories Supplied
The following items are supplied as part of the 1141A/1142A probe
system. Item numbers refer to the numbers in Figure 1-1 on page -7
and Figure 1-2 on page -8. Those without item numbers are supplied
but not shown in figures. See the Replaceable Parts List for parts not
listed below.
Item Description Qty Part Number
1 Differential Probe 1
2 10x Attenuator Adapter 1 5063-2144
3 100x Attenuator 1 5063-2145
4 ac Coupling Adapter 1 5063-2146
5 Two-inch Extension Leads (package 5) 1 5959-9334
6 Mini Grabbers 2 1400-1422
7 Five-inch Ground Lead 1 5061-6162
8 Shielded Signal Lead 1 01141-68702
9 Test Board 1 01141-66504
10 Flat-blade Alignment Tool 1 8710-1961
11 Circuit Connection Posts (strip of 20) 1 1251-5943
Probe Control and Power Module 1 1142A
Power Cord 1 see parts list
Carrying case
User and Service Manual 1
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7
Operating the Probe
Accessories Supplied
Figure 1-1
1141A Differential Probe and Accessories
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8
Operating the Probe
Accessories Available
Figure 1-2
1141A Miscellaneous Accessories
Figure 1-3
1142A Probe Control and Power Module
Accessories Available
The following accessories can be ordered.
• 5959-9335 Long Extension Lead (5.5 inch/14 cm), package of 5
• 5090-4833 Mini grabber for SMT, package of 20
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9
Operating the Probe
To inspect the probe
To inspect the probe
Inspect the shipping container for damage. If the shipping container or cushioning
material is damaged, it should be kept until the contents of the shipment have been
checked for completeness and the instrument had been checked mechanically and
electrically. Accessories supplied with the instrument are listed in see “Accessories
Supplied” on page 6 of this manual.
If the contents are incomplete, if there is mechanical damage or defect, or if the
instrument does not pass calibration tests, notify the nearest Agilent Technologies office.
If the shipping container is damaged, or the cushioning materials show sign of stress,
notify the carrier as well as the nearest Agilent Technologies office. Keep the shipping
materials for the carrier’s inspection. The office will arrange for repair or replacement
at Agilent Technologies’ option without waiting for a claim settlement.
Using the probe with other instruments
The 1141A/1142A probe system can be used with other instruments as well as
oscilloscopes. You can use it with a spectrum analyzer or frequency counter, or any
instrument with an input that can be terminated with 50 Ω.
If you are going to use the probe system with an instrument other than an oscilloscope,
you may need to set up the probe with an oscilloscope first. This will allow you to select
coupling and reject modes, and set offset, so the output of the probe is compatible with
signal requirements of the other instrument.
Recommended Test Equipment
The following table is a list of the test equipment required to test calibration, make
adjustments, and troubleshoot this instrument. The table indicates the critical
specifications of the test equipment and for which procedure the equipment is necessary.
Equipment other than the recommended model may be used if it satisfies the critical
specifications listed in the table.
Recommended Test Equipment
Equipment Required Critical Specifications
Recommended
Agilent
Model/Part Use
Signal Generator 1 to 200 MHz, 400 m Vrms 8648A P
Function Generator 2.5 to 500 kHz, 600 m Vp-p to 16 Vp-p 33120A A
Oscilloscope >400 MHz bandwidth, 1 mV/div sensitivity 54830B P,A
dc source ± 100 mV to 7 Vdc E3632A P
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