6Service
180 Keysight 34970A/34972A Service Guide
Self-Tests
A complete self-test performs the following tests. A failing test is indicated by the
test number and description in the display. For a complete list of error messages,
see Chapter 5 in the Keysight 34970A/34972A User’s Guide.
601 Front panel not responding The main CPU A1U205 attempts to establish serial
communications with the front panel processor A2U1. During this test, A2U1 turns
on all display segments. Communication must function in both directions for this
test to pass. If this error is detected during power-up self-test, the instrument will
beep. This error is only readable from the remote interface.
602 RAM read/write failed This test writes and reads a 55η and AAη checkerboard
pattern to each address of RAM. Any incorrect readback will cause a test failure.
This error is only readable from the remote interface.
603 A / D sync stuck The main CPU issues an A/ D sync pulse to A1U209 and
A1U205 to latch the value in the ADC slope counters. A failure is detected when a
sync interrupt is not recognized and a subsequent time-out occurs.
604 A / D slope convergence failed The input amplifier is configured to the measure
zero (MZ) state in the 10 V range. This test checks whether the ADC integrator
produces nominally the same number of positive and negative slope decisions (±
10%) during a 20 ms interval.
605 Cannot calibrate rundown gain This test checks the nominal gain between the
integrating ADC and the A1U205 on-chip ADC. This error is reported if the
procedure can not run to completion due to a hardware failure.
606 Rundown gain out of range This test checks the nominal gain between the
integrating ADC and the A1U205 on-chip ADC. The nominal gain is check to ±
10% tolerance.
607 Rundown too noisy This test checks the gain repeatability between the
integrating ADC and the A1U205 on-chip ADC. The gain test (606) is performed
eight times. Gain noise must be less than ± 64 LSBs of the A1U205 on-chip ADC.
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