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 Verification   19

 

 Test Setup
 Connect the appropriate current monitoring resistor (see Table 2-l) as shown in Fig. 2-3. The accuracy of the resistor must
be as specified in the table.

 Test Procedures
 The test procedures are given in Table 2-5. The tests are independent and may be performed in any order. The CC tests are:
 
•  Current Programming and Readback Accuracy.

•  CC Load Effect.

•  CC Source Effect.

•  CC Noise (PARD).

This test verifies that the current programming and readback are within specification.

1

Turn off the power supply and connect the current monitoring resistor as
shown in Fig. 2-3. Connect a DVM across the resistor .

2

Turn on the power supply and program the output for 5 volts and 0
amperes.

3

Short the load.

4

Observe the DVM voltage reading. Divide this by the resistance of the
current monitor resistor. Record the result as the Low Current value.

Value within specified Low Current
limits.

5

Record the front panel display readback.

Value within specified readback limits.

6

Program output current to full scale (see Table 2-2).

7

Repeat Steps 4 and 5.

Both current readings within specified
High Current and readback limits.

Periodic and random deviations (PARD) in the output (ripple and noise) combine to produce a residual ac current
superimposed on the dc output current. This test measures CC PARD, specified as the rms output current over the
frequency range of 20 Hz to 20 MHz.

1

Turn off the power supply and connect the current transformer, resistor,
capacitor and rms voltmeter (see Fig. 2-4).