Agilent Technologies 33120A manual 625

Chapter 6 Service

Self-Test Procedures

605Serial 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 U103 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 U301, U302, and U305. This tests does not check the serial path to the system DAC U303.

606Waveform ASIC failed This test is the first part of test 607 (below). This test sets up a burst modulation program of a special waveform (a four period ramp wave) where the data at each waveform address is the same as the last 12 bits of its address. The burst modulation waveform is run for 1 cycle plus 1 address and the waveform data is read back and compared. A correct result infers that the modulation program ran correctly and halted at the correct address. This checks the ability of U205 and U206 to correctly run a burst modulation program. This test and test 604 give a high confidence in the modulation circuitry. This test will fail if a trigger signal is present on the rear panel Ext Trig BNC input.

607SYNC signal detection failure, Bessel filter path This test runs the special waveform described in test 606 and counts transitions of the SYNC line. The test should provide 8 transitions of the SYNC signal. The test also checks the 7th Order Bessel filter path and U620 and U604. An incorrect number of transitions will generate an error. This test will fail if a trigger signal is present on the rear panel Ext Trig BNC input.

608SYNC signal detection failure, Elliptical filter path This test runs a special waveform and counts transitions of the SYNC line. The test should provide 2 transitions of the SYNC line. The test checks the 9th Order Elliptical filter path. An incorrect number of transitions will generate an error. This test will fail if a trigger signal is present on the rear panel Ext Trig BNC input.

625	I/O processor does not respond This test checks that communications 6
	can be established between U102 and U903 through the optically isolated
	(U101 and U901) 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 function generator will beep and the error
	annunciator will be on.

626I/O processor failed self-testThis test causes the earth referenced processor U903 to execute an internal, ram test. Failure will generate an error.

701Checks that the calibration security disable jumper is removed. If the jumper is shorted at power on, all non-volatile RAM is reset to initial factory values.

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