Agilent Technologies E3631A manual 100

Chapter 5 Service

Self-Test Procedures

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 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.
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 on the top board and U10 on the bottom board
	through the optically isolated (U1 and U2 on the bottom board) 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 U10 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.
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.

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