Agilent Technologies 664xA, 665xA, 667xA, 668xA, AGILENT Model 6653A: 3145A-00551, Model 6641A: 3217A-00111, Model 6645A: 3215A-00111, Model 6651A: 3130A-00171, Model 6652A: 3201A-00381, Model 6654A: 3148A-00391, Model 6655A: 3152A-00176, Model 6671A: 3129A-00218, Model 6672A: 3138A-00101, Model 6673A: 3138A-00101, Model 6674A: 3133A-00161, Model 6675A: 3138A-00101, Model 6680A: 3302A-00101, Model 6681A: 3250A-00101, Model 6682A: 3339A-00101, Model 6683A: 3339A-00161, Model 6684A: 3339A-00101

Front Panel Operation

Table 5-1. Front Panel Controls and Indicators (continued)

ú ENTRY Keys (continued)

thru Press to select numerical values .

Press to enter a minus sign.

Press to delete the last keypad entry. Use this key to remove one or more incorrect digits before they are

entered.

3 These four entry keys operate in two modes. Press and release for a single minimal change as

determined by the programming resolution (see Table 1-2 in Chapter l). Press and hold for an increasingly

rapid output change.

Press to delete an entire keypad entry and return to the meter mode. Use this key to exit from a value

before it is entered.

Press to enter a value or to accept an existing value and return the display to the meter mode.

The remaining shifted keys are for calibration (see "Appendix A - Calibration").

÷ Check Fuses LED and ø Dew LED (Series 668xA only)

Check Fuses

If one or more of the line fuses opens, this LED lights. (see "In Case of Trouble" in Chapter 3).

Dew

If you turn on the power supply when its inside humidity is ≈ 100%, the power will not go on and this

LED will light (see "In Case of Trouble" in Chapter 3).

Programming The Output

Introduction

Important These instructions show how to program a single power supply. There are special considerations when

you have two or more supplies connected in series or in autoparallel. See "Chapter 4 - User Connections

and Considerations".

The power supply accepts values directly in volts and amperes. Values will be rounded off to the nearest multiple of the

output resolution (see “Average Resolution" in Table 1-2 of Chapter 1). If you attempt to enter a value not in a valid range,

the entry will be ignored and OUT OF RANGE appears on the display.

Figure 5-2 shows the general response of a typical power supply. Unless directed otherwise, always keep the output voltage

and current within the boundaries of its operating line for the specified mode of operation (CV or CC).

Establishing Initial Conditions

Set the power supply to its *RST state by pressing . This state was stored in location 0 at the factory. If it

has since been changed, you can restore it as directed under “Turn-on Conditions”, later in this chapter. *RST results in the

following operating conditions:

■ Zero voltage output.

■ Minimal current output.

■ Output disabled (Dis annunciator on).

■ Overcurrent protection off (OCP annunciator off).

■ Protection circuits cleared (Prot annunciator off).