TB 9-6625-2277-24
provide a four-to-one ratio between the standard and TI. Where the four-to-one ratio
cannot be met, the actual accuracy of the equipment selected is shown in parenthesis.
5. Accessories Required. The accessories required for this calibration are common
usage accessories, issued as indicated in paragraph 4 above, and are not listed in this
calibration procedure.
Table 2. Minimum Specifications of Equipment Required
Manufacturer and model
Common name
Minimum use specifications
(part number)
CALIBRATOR
Dc voltage:
Fluke, Model 5720A (5720A) (p/o
Range: -1.9 to 190 V dc
MIS-35947); w amplifier, Fluke
Accuracy: 0.0395%
5725A/AR (5725A/AR)
Range: 1000 V dc
Accuracy: 0.05%
Ac Voltage:
Range: 190 mV to 1000 V ac
Accuracy:
45 Hz to 10 kHz
0.157%
20 kHz
0.273%
50 kHz
1.23%
Dc current:
Range: 190 A to 10 A
Accuracy: 0.092%
Range: 1.9 to 10 M
Accuracy: 0.075%
CALIBRATION PROCESS
6. Preliminary Instructions
a. The instructions outlined in paragraphs 6 and 7 are preparatory to the calibration
process. Personnel should become familiar with the entire bulletin before beginning the
calibration.
b. Items of equipment used in this procedure are referenced within the text by common
c. Unless otherwise specified, verify the result of each test and, whenever the test
requirement is not met, take corrective action before continuing with the calibration.
Adjustments required to calibrate the TI are included in this procedure. Additional
maintenance information is contained in the manufacturers' manuals and/or technical
manuals for the TI.
d. Unless otherwise specified, all controls and control settings refer to the TI.