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

Calibration

Table A-2. Typical Front Panel Calibration Procedure

Action

Display Response

Enabling the Calibration Mode

1. Begin calibration by pressing .

2. Enter calibration password from Entry keypad.

If password is correct the Cal annunciator will come on.

If password is incorrect, an error occurs2.

Note: The initial (factory-default) password is the model number of the power supply,

but it can be changed (see "Changing the Password" in Appendix A - Calibration).

PASWDl

PASSWD ERROR

Entering Voltage Calibration Values

1. Make certain the DVM is the only load on the power supply.

2. Select the first calibration point by pressing .

If the power supply is not in CV mode, an error occurs3

3. Read the DVM and use the Entry keypad to enter the first voltage value.

4. Select the second calibration point by pressing again.

5. Read the DVM and use the Entry keypad to enter the second voltage value.

Note: If one of the entered values is not within acceptable range, an error occurs.

The power supply is now holding the new voltage calibration constants in RAM.

(Meter mode)

VRDG1

WRONG MODE

(Meter mode)

VRDG2

(Meter mode)

CAL ERROR

Calibrating the OVP Trip Point

1. Make certain the voltage has been calibrated and there is no load on the power supply.

2. Select OVP calibration by pressing .

3. Wait for the power supply to compute the OVP calibration constant.

If the supply goes unregulated or into CC mode during OVP calibration, an error occurs.

If the computed constant is out of acceptable range, an error occurs.

The power supply is now holding the new OVP calibration constant in RAM.

(Meter mode)

OVPCAL

CAL COMPLETE

NOT CV MODE

DOES NOT CAL

Entering Current Calibration Values

1. Make certain appropriate shunt resistor (see Table A-l) is the only load on the power supply.

2. Select the first calibration point by pressing .

If the power supply is not in CC mode, an error occurs.4

3. Wait for DVM reading to stabilize. Then read DVM and compute the first current value

(DVM reading ÷ shunt resistance).

4. Use Entry keypad to enter the first current value.

5. Select second calibration point by pressing again.

(Meter mode)

IRDG1

WRONG MODE

(Meter mode)

IRDG2

6. Wait for DVM reading to stabilize. Then read DVM and compute the second

current value (DVM reading ÷ shunt resistance).

7. Use Entry keypad to enter the second current value.

Note: If the entered value is not within acceptable range, an error occurs.

Wait for the power supply to compute the new current calibration constants, which will be

stored in RAM.

(Meter mode)

CAL ERROR

CAL COMPLETE

1. If CAL DENIED appears, then an internal jumper has been set to prevent the calibration from being changed. (See the

Service Manual.)

2. If the active password is lost, the calibration function can be recovered by moving an internal jumper that defeats

password protection. However, this also will change all calibration constants to their factory-default values. (For more

information, see the Service Manual.)

3. Program the output current to 10% of its rated output*

4. Program the output voltage to l0% of its rated output*

* See applicable Output Ratings in "Chapter 1- General Information"