TB 9-6625-2003-24
ratio cannot be met, the four-to-one 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. When necessary, these items may be substituted by equivalent
items, unless specifically prohibited.
Table 2. Minimum Specifications of Equipment Required
Manufacturer and model
Common name
Minimum use specifications
(part number)
CALIBRATOR
Range: 1 to 246.47 V
Fluke, Model 5720A (5720A) (p/o MIS-
35 Hz to 15 kHz
35947); w amplifier, Fluke 5725A/AR
(5725A/AR)
Accuracy:
0.5%
Agilent, Model 3458A (3458A)
Range: 1 to 246.47 v ac
1
Accuracy:
A
Biddle-Gray, Model 71-650 (71-650)
Range: 0 to 20,400
ccuracy: 1
STANDARD
1Combined
accuracy of multimeter and resistance standard,
0.5%.
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
name as listed in tables 2.
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 manufacturer's manual for this TI.
d. Unless otherwise specified, all controls and control settings refer to the TI.
7. Equipment Setup
WARNING
HIGH VOLTAGE is used or exposed during the performance of
this calibration.
DEATH ON CONTACT may result if
personnel fail to observe safety precautions.
REDUCE
OUTPUT(S) to minimum after each step within the
performance check where applicable.
a. Remove TI from protective cover only if necessary to make adjustments.
b. Adjust meter mechanical zero, if necessary. (Not on some models.)