Keysight E3631A, Service Manual

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5 Service
116 Keysight E3631A Service Guide
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 U16 on the top board 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 U11 on the top board.
609
[1]
System ADC test failed 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
on the top board is togging. If no logic input detected, the power supply will assume
a 50 Hz line operation for all future measurements.
625
I/O processor did not respond This test checks that communications can be
established between U16 (U10 for serial MY53xx6xxx) on the top board and U10
(U21 for serial MY53xx6xxx) on the bottom board through the optically isolated (U1
and U2 on the bottom board) (U20 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 U10
(U21 for serial MY53xx6xxx) on the bottom board 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.