Agilent Technologies 1141A, 1142A Troubleshooting

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Service

Troubleshooting

Troubleshooting

Use the following paragraphs to assist in troubleshooting problems with the 1141A/1142A

Differential Probe.

Probe Troubleshooting

To troubleshoot the probe:

1Apply a known signal to the input of the probe.

2Check for an identical output at the output coax to the cable. This connection

is the one soldered to the PC board. If the probe output cable is not terminated,

or the coax is open, the output signal will be about twice the amplitude of the

input signal.

3If the signal is incorrect, check the power supply voltages from the 1142A Probe

Control and Power Module. Use the cable diagram on the next page.

4Troubleshoot the cable with an ohmmeter. Use the cable diagram on the next

page.

Probe Control and Power Module

Troubleshooting

The circuitry consists of simple power supplies, operational amplifiers, and TTL. Use

conventional troubleshooting techniques. A complete parts list, component locator, and

schematics are provided later in this chapter.

Contents

Main Agilent Technologies 1141A Differential Probe and 1142A Probe Control and Power Module Page Contents Page Introduction Accessories Supplied Page Accessories Available The following accessories can be ordered. To inspect the probe To inspect the probe Using the probe with other instruments Recommended Test Equipment Setting up the probe Initial Adjustment Page Using the Accessories Page Page Page Page Grounding Coupling Functions Page Page Remote operation Cleaning Requirements Differential Amplifiers and CMRR Page Page Equipment Required Introduction Equipment Required The Test Board The Test Board Calibration Tests dc Gain Accuracy dc Gain Accuracy Page Page Vout Vin --------------Vout1Vout2 ----------------------------------= () 2 Vin Page Page Bandwidth Page CMRR Test Page Page Calibration Test Record Probe Adjustment Adjustments Probe Adjustment Page Adjustment Procedure Page Page Page Page Page Adjustment Procedure Attenuator Adapter Adjustment Attenuator Adapter Adjustment Page Page Page Page Introduction Performance Specifications and Characteristics Performance Specifications and Characteristics Page Page General Characteristics General Characteristics Theory of Operation Theory of Operation Differential Probe Control and Power Module Theory of Operation Attenuator Adapters Page Service Policy Troubleshooting Probe Troubleshooting Probe Control and Power Module Troubleshooting Page Removing and Replacing Assemblies Differential Probe Page Probe Adapters Page Probe Control and Power Module Replaceable Parts Parts List Ordering Information Direct Mail Order System Manufacturers Codes Page Page Page Page Page Page 1141A and 1142A Replaceable Parts Page Page Page Page Page Locator Table for Control and Power Supply Page Page Index Agilent Technologies P.O. Box 2197 1900 Garden of the Gods Road Notices Manual Part Number Warranty Technology Licenses Restricted Rights Legend Product Safety Notices Warnings To clean the instrument Safety Symbols !