Constant Current (Cc) Tests - Agilent Technologies 6033A Service Manual

.

Constant Current (CC) Tests

CC Setup. Constant-current tests are analogous to constant-voltage tests, with the unit's output short circuited and the
voltage set to full output to assure CC operation. Follow the general setup instructions of Page 20.
Current Programming And Readback Accuracy. This procedure verifies that the current programming and readback
functions are within specifications. A GPIB controller must be used for this test. The accuracy of the current shunt resistor
(Rm) must be 0.02% or better. Proceed as follows:
a. Connect test setup shown in Figure 2-5, except replace the load with a short circuit.
b. Turn on ac power to the power supply.
c. Send string:
"VSET 20; ISET 1.0" (6033A).
''VSET 60; ISET 0.5" (6038A).
d. Check that the voltage across Rm is in the range:
9.79mV to 10.22mV (6033A).
48.9mV to 51.0mV (6038A).
Note the reading.
e. Enter and run the following program:
10 OUTPUT 705; "IOUT?''
20 ENTER 705; A
30 DISP A
40 GOTO 10
50 END
The value displayed by the controller should be the actual output current ± 0.025Adc.
f.
g. Send string:
''VSET 20; ISET 30" (6033A).
''VSET 60; ISET 10" (6038A).
h. Check that the voltage across Rm is in the range:
0.29935 to 0.30065Vdc (6033A).
1.0019 to 0.9982Vdc (6038A).
Note the reading.
i. Run the program listed in step e.
j. The value displayed by the controller should be the actual output current:
± 0.115Adc (6033A).
± 0.031Adc (6038A).
26
Figure 2-8. Load Transient Recovery Waveform