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16 Verification and Performance Tests
The following steps show how to set up an Agilent 3458A System Voltmeter from its front panel to take a statistical average
of 100 readings.
represents the unlabeled shift key in the FUNCTION/RANGE group.
1. Program 10 power line cycles per sample by pressing
.
2. Program 100 samples per trigger by pressing
.
3. Set up the voltmeter to take measurements in the statistical mode as follows:
4. a. Press
.
b. Press
until the MATH function is selected; then press .
c. Press
until the STAT function is selected; then press .
5. Now set up the voltmeter to read the average value of the measurements as follows:
6. a. Press
.
b. Press
until the RMATH function is selected; then press .
c. Press
until the MEAN function is selected; then press .
7. Execute the average reading program by pressing
.
8. Wait for 100 readings and then read the average measurement by pressing
. Record this as your result.
To repeat the measurement, perform steps (7) and (8).
CC Load Effect
This test measures the change in output current for a change in the load from full-scale output voltage to short circuit.
1. Turn off the module and connect the output to be tested as shown in Figure 2-1 with the voltmeter connected across the
current monitoring resistor.
2. Turn on the module and program the current to the full-scale current value and the output voltage to the maximum
programmable voltage value (see Table 2-1).
3. Adjust the load in the CV mode for full-scale voltage as indicated on the keyboard display. Check that the CC
annunciator is on. If it is not, adjust the load to drop the output voltage slightly until the annunciator comes on.
4. Record the output current reading (DVM reading
÷
current monitor resistance value in ohms).
Note You may want to use the average reading program described previously.
5. Short the load switch and record the output current reading.
6. The difference in the current readings in steps (4) and (5) is the load effect and should not exceed the limit specified in
the Performance Test Record Tables under CC LOAD EFFECT, for the particular model being tested.
CC Source Effect
This test measures the change in output current that results when the ac line voltage changes from the minimum to the
maximum value within the specifications.
1. Turn off the module and connect the ac power line through a variable-voltage transformer.
2. Connect the output terminals as shown in Figure 2-1 with the voltmeter connected across the current monitoring
resistor. Set the transformer to the nominal line voltage.
3. Turn on the module and program the current to the full-scale value and the output voltage to the maximum
programmable value (see Table 2-1).
4. Adjust the load in the CV mode for full-scale voltage as indicated on the front panel display. Check that the CC
annunciator is on. If it is not, adjust the load to drop the output voltage slightly until the annunciator comes on.
5. Adjust the transformer to the LOW line voltage (e.g., 87Vac for a 115Vac nominal input, or 174Vac for a 230Vac
nominal input).
6. Record the output current reading (DVM reading ÷ current monitoring resistor in ohms).