Agilent Technologies E3633A, E3634A manual ±10% tolerance

Chapter 5 Service

Self-Test Procedures

606	Rundown gain out of range This test checks the nominal gain between the
	integrating ADC and the U19 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 U19 on-chip ADC. The gain test (606) is performed
	eight times. Gain noise must be less that ±64 lsb’s of the U19 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 U20 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 U23.
624	Unable to sense line frequency This test checks that the LSENCE logic
	input U19 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 did not respond This test checks that communications can
	be established between U19 and U1 through the optically isolated (U2 and U5)
	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 U1 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 U19 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 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.

105

5