Service and Maintenance 8E364xA User’s and Service Guide 215CC load effect (load regulation)This test measures the immediate change in output current resulting from achange in the load from the full rated output voltage to short circuit.1 Turn off the power supply and connect the output to be tested as shown inFigure 8-1 with the digital voltmeter connected across the 0.01 Ω currentmonitoring resistor (R M1 ).2 Turn on the power supply. Select the low voltage range (8 V/3 A) [1], enable theoutput, and set the display to the limit mode. When the display is in the limitmode, program the output voltage to the maximum programmable value andthe output current to the full-scale rated value (3 A) [1] .3 Set the voltage of the electronic load to 8.0 V to operate it in the constantvoltage mode since a voltage drop occurs on the load wires. Check that the CCannunciator is turned on. If it is not, adjust the load so that the output voltagedrops slightly. Record the current reading by dividing the voltage reading onthe digital voltmeter by the resistance of the current monitoring resistor.4 Operate the electronic load in the short (input short) mode. Record the currentreading immediately by dividing the voltage reading on the digital voltmeterby the resistance of the current monitoring resistor. The difference betweenthe current readings in step 3 and step 4 is the load regulation current. Thedifference of the readings during the immediate change should be within thefollowing limits:[1] For the E3640A model. For other models, refer to Table 8-5.E3640A E3641A E3642A E3643A E3644A E3645A0.55 mA 0.33 mA 0.75 mA 0.39 mA 1.05 mA 0.47 mA
