8 Service and MaintenanceConstant Current (CC) Verifications206 E364xA User’s and Service Guide10 Record the value displayed on the controller. This valueshould be within the limit of:11 Repeat step 1 through step 10 for the other output.CC load effect (load regulation)This test measures the immediate change in output currentresulting from a change in the load from the maximumprogrammable value voltage to short circuit.1 Turn off the power supply and connect the output to betested as shown in Figure 8- 2 with the digital voltmeterconnected across the 0.01 Ω current monitoring resistor(RM1).2 Turn on the power supply. Select the low voltage range(8 V/3 A)[1], enable the output, and set the display to thelimit mode. When the display is in the limit mode,program the output voltage to the maximumprogrammable value and the output current to the fullrated value (3 A)[1].3 Set the voltage of the electronic load to full rated value(8.0 V)[1] to operate it in the constant voltage mode sincea voltage drop occurs on the load wires. Check that theCC annunciator is turned on. If it is not, adjust the loadso that the output voltage drops slightly. Record thecurrent reading by dividing the voltage reading on thedigital voltmeter by the resistance of the currentmonitoring resistor.E3646A E3647A E3648A E3649AOutput1 (IO ±9.5 mA) (I O ±6.2 mA) (I O ±12.5 mA) (IO ±7.1 mA)Output2 (IO ±14.5 mA) (I O ±11.2 mA) (I O ±17.5 mA) (IO ±12.1 mA)[1] For the E3646A model. For other models, refer to Table 8-5.
