4 Assembly Level Troubleshooting
132 Keysight 3458A Assembly-Level Repair Manual
Long term stability failure
A Long Term Stability failure is normally detected during a DC voltage
performance test. If for instance, the instrument fails the DC performance test
before the completion of the calibration period (for example. 24 hours to 2 years)
corresponding to the test limits against which the instrument is tested. This failure
may be because of the 3458A's long-term stability. A defective DC Reference (A9)
assembly causes this failure. Go to the Assemblies Removal/Installation
Procedures in Chapter 3 of this manual to replace the assembly.
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