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Chapter 3 Calibration Procedures
Constant Current (CC) Verifications
54
7
Program the output current to the full rated value (7.0A) by sending the
commands:
CURR 7.0
8
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 limit of (7A
± 2
4mA).
9
Readback the output current over the remote interface by sending the
command:
MEAS:CURR?
10
Record the value displayed on the controller. This value should be within the
limit (I
O
± 1
5.5mA).
CC Load Regulation
This test measures the change in output current resulting from a change in the
load from full-rated output voltage to short circuit.
1
Turn off the power supply and connect the output to tested as shown in Figure
3-1 with the digital voltmeter connected across the 0.01
W
current monitoring
resistor (R
M
).
2
Turn on the power supply. Select the 15V/7A range, enable the output, and set
the display to the limit mode. When the display is in the limit mode, program
the output voltage to the full rated value (15.0V) and the output current to the
full rated value (7.0A).
3
Operate the electronic load in constant voltage mode and set its voltage to
15.0V. Check that the CC annunciator is on. If it is not, adjust the load so that
the output voltage drops slightly. Record the current reading by dividing the
voltage reading on the digital voltmeter by the resistance of the current
monitoring resistor.
4
Operate the electronic load in short (input short) mode. Record the current
reading again by dividing the voltage reading on the digital voltmeter by the
resistance of the current monitoring resistor. The difference between the
current readings in step (3) and (4) is the load regulation current. The
difference of the readings should be within the limit of 0.95mA.