Agilent Technologies E3633A, E3634A manual CC Load Effect Load Regulation

Chapter 3 Calibration Procedures

Constant Current (CC) Verifications

6Record the value displayed on the controller. This value should be within the limit of (IO ± 5 mA).

7Program the output current to the full rated value (20.0 A)* or (7.0 A)** by sending the command:

CURR 20.0 (E3633A)

CURR 7.0 (E3634A)

8Divide the voltage drop (DVM reading) across the current monitoring resistor

(RM) by its resistance to convert to amps and record this value (IO). This value should be within the limit of (20 A ± 50 mA)* or (7A ± 24 mA)**.

9Readback the output current over the remote interface by sending the command:

MEAS:CURR?

10Record the value displayed on the controller. This value should be within the limit of (IO ± 35 mA)* or (IO ± 15.5 mA)**.

CC Load Effect (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.

1Turn 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 (RM).

2Turn on the power supply. Select the 8V/20A* or 25V/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 (8.0 V)* or (25.0 V)** and the output current to the full rated value (20.0 A)* or (7.0 A)**.

3Set the voltage of the electronic load to (6.0 V)* or (23.0 V)** to operate it in constant voltage mode since a voltage drop occurs on the load wires when (20.0 A)* or (7.0 A)** flows on the load wires. 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.

4Operate 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 (2.25 mA)* or (0.95 mA)**.

*For Agilent E3633A Model **For Agilent E3634A Model

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