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