During calibration, it is a good idea to check the Calibrator fault queue after each calibration command. This will alert the user to any problems during the calibration. To check the fault queue, send the command "ERR?" as shown below.

The verification tests are used as the basis of:

• Final product testing performed in manufacturing

• Automated test system design

• Product acceptance by the end user

This section describes the minimum testing necessary to verify with reasonable certainty that the Calibrator is totally functional and will meet its published specifications over the specified environmental conditions and for the specified calibration interval. Any personnel using the verification tests must be familiar with the operation of the Calibrator and the have ability to set up and operate the recommended test equipment. While the verification tests were developed for manual testing, if the test steps listed are followed and test uncertainty ratios are kept above 3:1, automation of the verification test will meet the requirements of verifying the product specifications.

This instrument is capable of outputting lethal voltages. Observe all safety precautions. To avoid shock, the operator should not electrically contact the Output V or Sense binding posts during operation. Lethal voltages of up to 230 V ac or dc may be present.

Whenever the nature of the operation permits, keep one hand away from the equipment to reduce the hazard of current flowing through vital organs of the body.

The verification tests are sufficient to insure that the shipped units will meet and/or exceed published specifications over the specified environmental conditions and specified calibration interval. All tests limits are based on specifications measured within 23 oC +/- 3 oC (room temperature) and humidity less than 80%. Any test that fails will be rerun immediately. If the failure repeats, it will be noted as a failure and testing will continue with the next step if possible. Failures will be repaired and then the unit will be

Test Equipment

The equipment listed in Table 3-1 is for reference only. You can substitute any of the equipment provided adequate measurement accuracy with a test uncertainty ratio of 4:1 if possible. Only equipment that is calibrated and traceable according to the manufacturer specifications may be used for performance verification testing.

Verification Tests

XWWarning retested.

Table 3-1. Recommended Equipment for Calibration and Verification

Recommended Equipment

Recommended Model


Calibration and Verification Procedure

Chapter 3 of the 57LFC/AN Service Manual

Define procedure test points and specifications

Test Lead Kit

Fluke 8508A-LEAD or equivalent

Cable interconnect assembly

8-1/2 digit DMM

Fluke 8508A DMM or equivalent

Measure DC Volts, DC Current, AC Volts, AC Current, and Resistance

Precision Calibrator

Fluke 5720A or equivalent

Characterize 8508 for ac voltage and ac current measurements

Harmonic Distortion Analyzer

Boonton 1130 or equivalent

Measure LF harmonic distortion of ac voltage and current

Harmonic Distortion Analyzer

Agilent ESA 4411A Spectrum Analyzer or equivalent

Measure harmonic distortion of ac voltage for f > 30 kHz

Test Controller

Computer with an IEEE-488 interface card or equivalent

Connect to and communicate with the Calibrator

Frequency Measurement

Fluke 8508A or counter with 10 Hz to 100 kHz frequency range and 25 ppm frequency uncertainty or equivalent

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