Assembly Level Troubleshooting 4
Keysight 3458A Assembly-Level Repair Manual 125
“TEST VALUE OUT OF RANGE” error message
This error message indicates that a test did not meet certain pre-defined limits.
The number displayed next to the message indicates the test limit that was
exceeded during the test.
The number can be used to determine the assembly that caused the test to fail.
Numbers from 62 through 189 indicate a failure on the DC Circuitry (A1) assembly.
Numbers from 190 and above indicate a failure on the AC Converter (A2)
assembly. Refer to the Assemblies Removal/Installation Procedures in Chapter 3
of this manual to replace a defective assembly.
Performance test failures
Performance test failures are failures that may not be detected during the self-test
but are detected during the performance tests. These failures may not be
detected by the self-test due to the high accuracy of the 3458A.
Before assuming that a performance test has failed, you must make sure your test
equipment and performance test methods have sufficient accuracy to check the
3458A. The 3458A is very accurate and needs very accurate standards to
determine if a performance test has failed or not. Be sure to read the accuracy
requirements in the 3458A Calibration Manual before troubleshooting
performance test failures.
If you are sure that the 3458A fails a performance test, determine what function is
inaccurate and then replace the appropriate assembly. The following lists the
functions and probable corresponding assemblies.
1 DC Volts Function Failure -- DC Circuitry (A1) assembly.
2 DC Current Function Failure -- DC Circuitry (A1) assembly.
3 OHMS Function Failure -- DC Circuitry (A1) assembly.
4 AC Volts Function Failure -- AC Converter (A2) assembly.
5 AC Current Function Failure -- AC Converter (A2) assembly.
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