User`s guide

Chapter 3 Calibration Procedures

Constant Voltage (CV) Verifications

Load Transient Response Time

This test measures the time for the output voltage to recover to within 15 mV of

nominal output voltage following a load change from full load to half load, or half

load to full load.

1 Turn off the power supply and connect the output to be tested as shown in Figure 3-

1 with an oscilloscope. Operate the electronic load in constant current mode.

2 Turn on the power supply. Select 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 current to the full rated value (10.0 A)* or (4.0 A)** and the voltage to the full

rated value (20.0 V)* or (50.0 V)**.

3 Set the electronic load to transient operation mode between one half of the output’s

full rated value and the output’s full rated value at a 1 kHz rate with 50% duty cycle.

4 Set the oscilloscope for ac coupling, internal sync, and lock on either the positive or

negative load transient.

5 Adjust the oscilloscope to display transients as shown in Figure 3-3. Note that the

pulse width (t2 - t1) of the transients at 15 mV from the base line is no more than 50

μsec for the output.

Figure 3-3. Transient Response Time

*For Agilent E3633A Model **For Agilent E3634A Model