Keysight E3632A, Service Manual

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2 Service
68 Keysight E3632A Service Guide
605
Cannot calibrate rundown gain
This test checks the nominal gain between integrating ADC and the U17 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 U17 on-chip ADC. The nominal
gain is checked to ±10% tolerance.
607
Rundown too noisy
This test checks the gain repeatability between the integrating ADC and the U17 on-chip ADC. The gain
test (606) is performed eight times. Gain noise must be less that ±64 LSB’s of the U17 on-chip ADC.
608
Serial configuration readback failed
This test re-sends the last 3 byte serial configuration data to all the serial path (SERDAT, SERBCK,
SERCLK). The data is then clocked back into U18 and compared against the original 3 bytes sent. A failure
occurs if the data do not match. This tests checks the serial data path through U22.
609
[a]
This test checks if the ADC hardware is functional. The main controller U10 establishes communication
with the ADC and checks if there are any error bits set for the ADC's status reporting.
624
Unable to sense line frequency
This test checks that the LSENCE logic input U17 is toggling. If no logic input detected, the power supply
will assume a 50 Hz line operation for all future measurements.
625
I/O processor does not respond
This test checks that communications can be established between U17 (
U10 for serial MY53xx6xxx ) and U4
( U752 for serial MY53xx6xxx ) through the isolated (U6 and U7) ( U751 for serial MY53xx6xxx ) serial data
link. Failure to establish communication in either direction will generate an error. If this condition is
detected at power-on self-test, the power supply will beep and the error annunciator will be on.
626
I/O processor failed self-test
This test causes the earth referenced processor U4 (
U752 for serial MY53xx6xxx ) to execute an internal,
ram test. Failure will generate an error.
630
Fan test failed
This test checks if the fan current is flowing. If the current is not detected at power-on self-test, the power
supply will beep and the error annunciator will be on. Fan test fail could likely induce overtemperature
condition in the power supply.