User`s guide

Chapter 3 Calibration Procedures
Constant Voltage (CV) Verifications
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7 Program the output voltage to full rated value (20.0 V)* or (50.0 V)** by sending the
command:
VOLT 20.0 (E3633A)
VOLT 50.0 (E3634A)
8 Record the output voltage reading on the digital voltmeter (DVM). The reading should
be within the limit of (20 V ± 20 mV)* or (50 V ± 35mV)**.
9 Readback the output voltage over the remote interface by sending the command:
MEAS:VOLT?
10 Record the value displayed on the controller. This value should be within the limit of
(DVM ± 15 mV)* or (DVM ± 30 mV)**.
CV Load Effect (Load Regulation)
This test measures the immediate change in the output voltage resulting from a change
in the output current from full to no load.
1 Turn off the power supply and connect a digital voltmeter between the (+) and (-)
terminals of the output as shown in Figure 3-1.
2 Turn on the power supply. Select the 20V/10A* or 50V/4A** range, enable the output,
and set the display to the limit mode. When the display is in the limit mode, program
the output current to the maximum programmable value and the voltage to the full
rated value (20.0 V)* or (50.0 V)**.
3 Operate the electronic load in constant current mode and set its current to
(10.0 A)* or (4.0 A)**. Check that the front panel CV annunciator remains lit. If not
lit, adjust the load so that the output current drops slightly until the
CV annunciator
lights. Record the output voltage reading on the digital voltmeter.
4 Operate the electronic load in open mode (input off). Record the output voltage
reading on the digital voltmeter immediately. The difference between the digital
voltmeter readings in steps (3) and (4) is the CV load regulation. The difference of
the readings during the immediate change should be within the limit of (4 mV)* or
(7 mV)**.
*For Agilent E3633A Model **For Agilent E3634A Model