Agilent Technologies 6031A, 6035A, 6032A, 6030A Readback DAC Circuits, Readback Multiplexer U20

Use the front panel controls to vary the output voltage and current from zero to full-scale output. Remember to turn off the unit and connect a short across the output before programming the current from zero to full scale. Use a DMM and check the voltages at the following nodes:

CV DAC Circuits

Node	Setup	Measurement
U69-6	Voltage set to 0.	0V
	Voltage set to max.	+ 5V
U64-6	Voltage set to 0.	0V
	Voltage set to max.	-10V
CC DAC Circuits
Node	Setup	Measurement
U68-6	Current set to 0.	0V
	Current set to max.	+ 5V
U65-6	Current set to 0.	0V
	Current set to max.	-10V

Readback DAC Circuits

Refer to Figure 3-4 for the waveforms to troubleshoot the readback circuits.

The turn-on selftest waveform at U24-7 is obtained by toggling the on/off switch repeatedly to perform the selftest routine. If this waveform is not correct, isolate the problem either to the readback DAC or the multiplexer.

Note: To troubleshoot the readback DAC from the front panel if the unit has failed selftest, place jumper A8J5 in the skip selftest position (see Table 3-2). This lets you operate the unit even though it fails the internal selftest.

Use the front panel controls to vary the output voltage from zero to full-scale output to obtain the waveforms at U67-6. These waveforms check the operation of the readback DAC.

To check the multiplexer, use the front panel controls to obtain the waveforms at the output of the multiplexer (U24-2). Remember to turn off the unit and connect a short across the output before programming the current from zero to full scale. Press "OVP DISPLAY'' on the front panel to display the OV_MON portion of the waveforms.

If the waveforms are not correct, use the front panel controls and a DMM to check the multiplexer input voltages at the following nodes:

Readback Multiplexer (U20):

Node	Setup	Measurement
U20-9	Voltage set to 0.	0V
	Voltage set to max.	+ 5V
U20-10	Current set to 0.	0V
	Current set to max.	+ 5V
U20-11	OV set to 0.	0V
	OV set to max.	+2.2V

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