Electronic Load; Current-Monitoring Resistor; Operation Verification Tests; Performance Tests - Agilent Technologies 6631B Service Manual

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Electronic Load

Many of the test procedures require the use of a variable load capable of dissipating the required power. If a

variable resistor is used, switches should be used to either; connect, disconnect, or short the load resistor.

For most tests, an electronic load can be used. The electronic load is considerably easier to use than load

resis tors, but it may not be fast enough to test transient recovery time and may be too noisy for the noise

(PARD) tests.

Fixed load resistors may be used in place of a variable load, with minor changes to the test procedures. Also,

if computer controlled test setups are used, the relatively slow (compared to computers and system

voltmeters) settling times and slew rates of the power supply may have to be taken into account. "Wait"

statements can be used in the test program if the test system is faster than the supply.

To eliminate output-current measurement error caused by voltage drops in the leads and connections,

connect the current monitoring resistor between the -OUT and the load as a four-terminal device. Connect

the current-monitoring leads inside the load-lead connections directly at the monitoring points on the

resistor element.

To assure that the power supply is operating properly, without testing all specified parameters, perform the

following test procedures:

a. Perform the turn-on and checkout procedures given in the Operating Manual.

b. Perform the Voltage Programming and Readback Accuracy test, and the Current Programming and

Readback Accuracy tests from this procedure.

NOTE:

A full Performance Test consists of only those items listed as "Specifications" in Table A-

1 of the Operating Manual, and that have a procedure in this document.

The following paragraphs provide test procedures for verifying the power supply's compliance with the

specifications listed in Table A-1 of the User's Guide. All of the performance test specifications are entered

in the Performance Test Record Card. You can record the actual measured values in the column provided in

this card.

Verification and Performance Tests - 2

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