Chapter 3 Calibration Procedures
Constant Current (CC) Verifications
58
Constant Current (CC) Verifications
Constant Current Test Setup
Follow the general setup instructions in the "Measurement Techniques" section
starting on page 47 and the specific instructions will be given in the following
paragraphs.
Current Programming and Readback Accuracy
This test verifies that the current programming and GPIB or RS-232 readback
functions are within specifications. Note that the readback values over the remote
interface should be identical to those displayed on the front panel. The accuracy of
the current monitoring resistor must be 0.1% or better.
You should program the power supply over the remote interface for this test to avoid
round off errors.
1 Turn off the power supply and connect a 0.1Ω current monitoring resistor (R
M
) across
the output to be tested and a digital voltmeter across the current monitoring resistor (R
M
).
2 Turn on the power supply. Enable the outputs and select the desired output to be tested
by sending the commands:
OUTP ON
INST {P6V|P25V|N25V}
3 Program the selected output voltage to 5.0 volts and the current to 0 amps by sending
the commands:
VOLT 5
CURR 0
4 Divide the voltage drop (DVM reading) across the current monitoring resistor (R
M
)
by its resistance to convert to amps and record this value (I
O
). This value should be
within the limits specified below for each output tested. Also, note that the CC, Adrs,
Lmt, and Rmt annunciators are on.
Output Programming Accuracy
+6V 0 A ± 10 mA
+25V 0 A
± 4 mA
-25V 0 A
± 4 mA
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