Programming instructions

Chapter 2 Operational Verification Tests 13

Chapter 2 Operational Verification Tests

Introduction

This section contains Operational Verification Tests which provide an

abbreviated method of testing the operation and accuracy of the unit. The

Operational Verification Tests are designed to provide a 90% confidence that

the 3458A is operational and meets the specifications listed in

Appendix A.

Operational Verification Tests perform a three point verification. These three

points are the basis for all internal electronic adjustments (see the section

titled "The Basis for Auto-Calibration" in Appendix B, Electronic

Calibration of the 3458A). Prior to the three point test, a self test verifies that

all calibration constants are within their upper and lower limits, an indicator

of proper operation.

Operational Tests

Required Equipment The following equipment or its equivalent is required for these operational

tests.

• Stable DC voltage/resistance standard (Fluke 5700A or equivalent)

• Transfer standard DMM (3458A Opt. 002 within 90 days of CAL)

• Low thermal short (copper wire)

• Low thermal test leads (such as Keysight 11053A, 11174A, or 11058A)

Note Equipment required for the adjustment procedures can be used for

operational tests since the three-point test verifies the external adjustment

points of the adjustment procedure.

To hav

e your transfer standard 3458A OPT. 002 calibrated to 90 day

specifications, contact your Keysight Technologies sales and service office.

Preliminary Steps 4. Verify that the DC voltage/resistance standard is properly warmed up.

5. The 3458A requires a 4 hour warm-up period. If this has not occurred

turn the instrument ON and allow it to warm up before proceeding.

6. The internal temperature of the 3458A under test must be within

°C of its temperature when last calibrated. Use the TEMP?

command to obtain the current internal temperature and compare it to

the calibration temperature obtained by executing the command

CAL? 59 for DCV and CAL? 60 for OHMS. You can use the

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