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

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Agilent Technologies 669xA, 665xA, 664xA Checking the Voltage Function, Open or Connected to a Voltmeter, Press Prot Clear

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

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