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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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