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16 Verification
Table 2-4. Constant Voltage (CV) Tests
Action
Normal Result
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 Turn off the power supply and connect a DVM across +S and -S
(see Fig. 2-1).
2 Turn on the power supply with no load and program the output for 0 volts
and maximum programmable current (see Table 2-2).
CV annunciator on. Output current near
0.
3 Record voltage readings at DVM and on front panel display.
Readings within specified Low Voltage
limits.
4 Program voltage to full scale (see Table 2-2).
5 Record voltage readings of DVM and on front panel display.
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 full-load to no-load.
1 Turn off the power supply and connect a DVM across +S and -S
(see Fig. 2-1).
2 Turn on the power supply and program the current to its maximum
programmable value and the voltage to its full-scale value (see Table 2-2).
3 Adjust the load to produce full-scale current (see Table 2-2) as shown on
the front panel display.
CV annunciator is on. If it is not, adjust
the load to slightly reduce the output
current until the annunciator comes on.
4 Record voltage reading of the DVM.
5 Adjust load to draw 0 amperes (open load). Record voltage reading of the
DVM.
6 Check test result.
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
variable-voltage transformer.