Chapter 4 Assembly Level Troubleshooting 67
Chapter 4 Assembly Level
Troubleshooting
Introduction
This section provides a technical description and assembly level
troubleshooting procedures for the 3458A Multimeter.
WARNING Only personnel with knowledge of electronic circuitry and an
awareness with the hazards involved should test and
troubleshoot the instrument.
Caution To prevent electrostatic discharge (ESD) damage to ICs, always
observe anti-static techniques when assemblies are handled or
serviced. Refer to Chapter 3 of this manual for more
information on ESD.
Test Equipment Required
You need the following equipment:
1. A 4 1/2 digit digital multimeter that can measure +5 V, +18 V, and
-18 V DC. This is only used to check and troubleshoot the power
supplies.
2. A computer with GPIB capability to check the 3458A's GPIB
operation. This is only required for an GPIB failure.
3. An oscilloscope or logic probe. This is only required for an Ext Out
failure.
3458A Adjustments/Calibration
Instrument adjustments/calibration must be performed whenever a printed
circuit board assembly has been replaced or removed from the instrument.
Removal or replacement of some assemblies only requires internal
calibration (by executing the "ACAL ALL" command). Others need
complete adjustments (for example, Offset, DC Gain, etc.). It is also good
practice to execute the "ACAL ALL" command after the covers have been
removed and replaced on the instrument.
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