Agilent Technologies 66319B User Manual page 148

B - Performance, Calibration, and Configuration
- 3A Range Current Sink Operation (performance, calibration)
This test verifies current sink operation and readback of the –3A range.
a. Turn off the dc source and connect the current monitoring resistor across the output and the DMM
across the resistor as shown in Figure B-1b. Connect an external power supply in place of the
electronic load. Set the DMM to operate in voltage mode.
b. Turn on the dc source and set the current range readback to 3A.
c. Turn on the external power supply and program it to 1.5V and 3A. Then program the dc source to
0V and the current to the full scale value in Table B-2. The UUT display should read approximately
−3A.
d. Divide the voltage drop (DVM reading) across the current monitoring resistor by its resistance to
convert to amperes and record this value. Also, record the current reading that appears on the front
panel display. The readings should be within the limits specified in the performance test record card
for the appropriate model under 3A Range Current Readback @ −3A.
CC Load and Line Regulation (performance)
The following CC Load Effect and CC Source Effect tests verify the dc regulation of the output current.
To insure that the values read are not the instantaneous measurement of the ac peaks of the output current
ripple, several dc measurements should be made and the average of these readings calculated. An
example of how to do this is given below using an Agilent 3458A System Voltmeter programmed from
the front panel. Set up the voltmeter and execute the "Average Reading" program follows:
a. Program 10 power line cycles per sample by pressing NPLC 1 0 ENTER .
b. Program 100 samples per trigger by pressing (N Rdgs/Trig) 1 0 0 ENTER .
c. Set up voltmeter to take measurements in the statistical mode as follows:
Press Shift key, f0, Shift key, N
Press ^ (up arrow) until MATH function is selected, then press >.
Press ^ (up arrow until STAT function is selected then press (ENTER).
d. Set up voltmeter to read the average of the measurements as follows:
Press Shift key, f1, Shift key, N.
Press down arrow until RMATH function is selected, then press >.
Press ^ (up arrow) until MEAN function is selected, then press ENTER.
e. Execute the program by pressing f0, ENTER, TRIG, ENTER
f. Wait for 100 readings and then read the average measurement by pressing f1, ENTER.
To repeat the measurement, perform steps (e) and (f).
CC Load Effect (performance)
This test measures the change in output current for a change in load from full scale output voltage to
short circuit.
a. Turn off the dc source and connect the output as shown in Figure B-1b with the DVM connected
across the current monitoring resistor.
b. Turn on the dc source and if it was set to low range readback in the previous test, set it back to high
or auto. Program the current to full scale and the output voltage to the maximum programmable
voltage value (Vmax) in Table B-2.
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