Table 2-4. Constant Voltage (CV) Tests
| Action | Normal Result |
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Voltage Programming and Readback Accuracy
This test verifies that the voltage programming, GPIB readback (GPIB system power supplies only), and front panel display functions are within specifications. With system power supplies, values read back over the GPIB should be the same as those displayed on the front panel.
1
2
3
4
5
Turn off the power supply and connect a DVM across +S and
Turn on the power supply with no load and program the output for 0 volts and maximum programmable current (see Table
Record voltage readings at DVM and on front panel display.
Program voltage to full scale (see Table
Record voltage readings of DVM and on front panel display.
CV annunciator on. Output current near 0.
Readings within specified Low Voltage limits.
Readings within specified High Voltage limits.
CV Load Effect
This test measures the change in output voltage resulting from a change in output current from
1
2
3
4
5
6
Turn off the power supply and connect a DVM across +S and
Turn on the power supply and program the current to its maximum programmable value and the voltage to its
Adjust the load to produce
Record voltage reading of the DVM.
Adjust load to draw 0 amperes (open load). Record voltage reading of the DVM.
Check test result.
CV annunciator is on. If it is not, adjust the load to slightly reduce the output current until the annunciator comes on.
The difference between the DVM readings in steps 4 and 5 are within the specified Load Effect limits.
CV Source Effect
This test measures the change in output voltage resulting from a change in ac line voltage from its minimum to maximum value within the line voltage specifications.
1
Turn off the power supply and connect the ac power input through a
