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

Turn-On Checkout 53

Table 3-2. Checking the Current Functions (Output Terminals Shorted) (continued)

Action

Display

Explanation

Press

AMPS 0.000

Dis annunciator turns on.

Press

You have disabled the overcurrent protection circuit. The OCP

annunciator turns off.

Press

( )**

You have cleared the overcurrent protection circuit. The Prot

annunciator turns off.

Press

AMPS 1.000

Dis turns off and CC turns on. The output current is restored.

If you have a shorting wire of sufficient capacity, you may continue testing up to the maximum rated current of the power

supply (see "Performance Specifications"). When finished, go to the next step.

Press AMPS 0.000 Dis turns on and output current drops to zero.

Turn off the power supply and remove the short from the output terminals.

** is the unlabeled blue key.

Checking The Save And Recall Functions (All Models)

The Series 668xA supplies have four nonvolatile memory storage locations (0 through 3). The supplies of all other series

have five (locations 0 through 4). Proceed as follows:

■ Make certain that the output is on (Dis annunciator is off).

■ Set the voltage output to 5 by pressing .

■ Save this value to location 1 by pressing .

■ Return the output voltage to 0 by pressing (This step is based on the fact that a newly shipped power

supply has the *RST parameters stored in location 0 (see "Chapter 5 - Front Panel" for more information).

■ Press and notice that the output voltage returns to the value stored in location 1.

Determining The GPIB Address (All Models)

When the power supply is turned on, the display shows ADDR n, where n is the power supply GPIB address. Any time you

want to see the address, press .

The display will indicate ADDR 5, which is the factory default. If the address has been changed, then a different number

will appear (see “Setting the GPIB Address” in “Chapter 5 - Front Panel”).

In Case Of Trouble

Line Fuse

If the power supply appears "dead" with a blank display and the fan not running, first check your power source to be certain

line voltage is being supplied to the power supply. If the power source is normal, the power supply line fuse may be

defective. (On Series 668xA supplies, if the Check Fuses LED is blinking, then one or two of the line fuses are open.) If

the supply has a defective fuse, replace it only once. If it fails again, investigate the reason for the failure. Proceed as

follows: