B

Verification and Calibration

Introduction

This appendix includes verification and calibration procedures for the HP 66332A and HP 6631B/6632B/6633B/6634B dc source. Instructions are given for performing the procedures either from the front panel or from a controller over the HP-IB.

The verification procedures do not check all the operating parameters, but verify that the dc source is performing properly. Performance Tests, which check all the specifications of the dc source, are given in the applicable dc source Service Manual.

Important Perform the verification procedures before calibrating your dc source. If the dc source passes the verification procedures, the unit is operating within its calibration limits and does not need to be recalibrated.

Equipment Required

The equipment listed in the following table, or the equivalent to this equipment, is required for verification and calibration.

Table B-1. Equipment Required

Equipment

Characteristics

Recommended Model

Digital Voltmeter

Resolution: 10 nV @ 1 V

HP 3458A

 

Readout: 8.5 digits

 

 

Accuracy: >20 ppm

 

Current Monitor1

15 A (0.1 Ω ), ±0.04%, TC=5ppm/°C

Guildline 9230/15

Load Resistor

400Ω (HP 6631B calibration, used for

 

(3 W min. TC=20ppm/°C)

verification of all models)

HP p/n 0811-2878

 

1.1 kΩ (HP 6632B/66332A calibration)

 

 

2.5 kΩ (HP 6633B calibration)

 

 

5 kΩ (HP 6634B calibration)

 

Power Supply

8 V @ 10 A

HP 6631B

HP-IB Controller

Full HP-IB capabilities

HP Series 200/300 or

 

 

equivalent

1The 4- terminal current shunt is used to eliminate output current measurement error caused by voltage drops in the load leads and connections. It has special current-monitoring terminals inside the load connection terminals. Connect the voltmeter directly to these current-monitoring terminals.

Test Setup

Figure B-1 shows the setup for the tests. Be certain to use load leads of sufficient wire gauge to carry the full output current (see chapter 3).

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