Checking the Voltage Function

The tests in Table 3-1 check the basic voltage functions with no load connected to the power supply. The VOLTS display will show various readings. Ignore the AMPS display.

Table 3-1. Checking the Voltage Functions (Output Terminals Open)

	Procedure	Display	Explanation
		Output Terminals	Open or Connected to a Voltmeter
If Dis is on, turn it off by pressing
Press	key	VOLT 0.000	Default voltage setting. CV annunciator should be on. (If CC annunicator
			is on, increase the current by pressing	one or more times until
			CC turns off and CV turns on.)
	Press	VOLT 4	Program output to 4 volts.

Press		4.000	Enter the voltage. Meter mode displays output voltage. During these
			tests, there may be a small (relative to full output) AMPS reading that
			will be ignored.
Press	several		Voltage decreases several millivolts each time you press the key.*
times
Press	the same		Voltage increases several millivolts each time you press the key.*
number of times

*The number of millivolts change is determined by the voltage programming resolution of your power supply (see "Supplemental Characteristics" in Chapter 1).

Rotate Voltage control first			Control operates similarly to	and	keys. The control
counterclockwise and then			is rate sensitive. Turning it more quickly causes a more rapid change in
clockwise			voltage.
Press	4.000		Program output to 4 volts.
Press			Display shows default OVP (overvoltage protection) trip voltage for your
			supply (see "Supplemental Characteristics" in Chapter 1).
Press	OV	3	Program the OVP to 3 volts, which is less than the output voltage.
Press	0.000		OVP voltage entered is less than the output voltage. This causes the OVP
			circuit to trip. The output drops to zero, CV turns off, and Prot turns on.
Press	OV - -	- - -	Shows that the power supply shuts down because the OVP circuit has
			tripped.
Press			Return display to meter mode (optional step).
Press	0.000		Program the OVP to 4.5 volts, which is greater than the output voltage.
			Note: You cannot clear an OVP trip until you have first removed the
			cause of the condition.
Press Prot Clear	4.000		The OVP circuit is cleared, restoring the output. Prot turns off and CV
(	)*		turns on.

		*	is the unlabeled blue key.

Turn-On Checkout 53

668xA, 669xA, 667xA, 664xA, 665xA specifications

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