Fluke 74X Series, Calibration Manual

Page: 19 / 44

Performance Verification Tests
11
Performance Verification Tests
Fluke recommends re-certification every year. To re-certify, perform the verification
procedure. If any test points are out of tolerance, you need to calibrate, then re-verify.
Two-year specifications are included for those customers who do not require the highest
accuracy.
The following tests verify compliance to specifications on the Documenting Process
Calibrator.
Equipment Required for Verification
The equipment required for verification of the Documenting Process Calibrator is listed
in the following table. If the recommended instruments are not available, you can
substitute other source and measure instruments as long as they meet the minimum test
requirements.
Table 2. Equipment Required for Verification
Equipment Minimum Specification Recommended Model
Calibrator No substitute recommended Fluke 5500A
Frequency Counter 1Hz to 50kHz, 25ppm timebase Fluke PM6666
Oscilloscope 1Hz to 50 kHz (duty cycle accuracy
1%) Fluke 123
DMM No substitute recommended Hewlett Packard 3458A
Short jumpers (2) banana type Fluke PN 944632
Test leads (2 sets) banana to banana type Fluke TL20
Thermocouple miniplug polarize, with type-K thermocouple
welded to copper wire see Figure 11
Lag bath characterized by a 0.1
°
C standard
thermometer (0.02
°
C resolution)
and a 1-pint thermos bottle
Princo ASTM-56C Mercury
Thermometer, Dewar Flask and
Cap
Smart (HART) Pressure Transmitter HART communication protocol Rosemount 1151 or 3051
HART Interface Cable Assembly No substitute recommended Fluke PN 689653
How to Verify
For each procedure there is a table of test points and acceptable readings. If the result of
the test is outside the range shown, the Unit Under Test (UUT) is out of tolerance and
should be re-calibrated or repaired if necessary. There are separate columns for one and
two-year specifications wherever the specifications differ.
Follow these general instructions for all the tests:
•
For all tests, operate the UUT on battery power. Make sure the battery is fully
charged. Do not use the battery eliminator (BE9005).
•
For measurement functions, press the [RANGE] button to lock the range on the range
specified in the table of test points. The [RANGE] button may need to be pressed
several times.