Chapter 5 Service

Self-Test Procedures

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 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 U22.

624

Unable to sense line frequency This test checks that the LSENCE logic

 

input U17 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 U17 and U4 through the optically isolated (U6 and U7)

 

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-testThis test causes the earth referenced

 

processor U4 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.

631

System DAC test failed This test checks if the DAC hardware is functional.

 

The main controller U17 sends a reference voltage data to DAC and converts

 

the DAC output to digital data to see if the digital data is within a valid range.

632

Hardware test failed This test checks the the status of voltage and current

 

error amplifiers for the power circuit. If both amplifiers are not operational,

 

the power supply will beep and the error annunciator will be on.

99

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Agilent Technologies E3632A manual ±10% tolerance