TB 9-6625-2275-24
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)
Fluke, Model 5720A (5720A) (p/o
CALIBRATOR
Dc voltage:
MIS-35947); w amplifier, Fluke
Range: 0 to 19 V
1
5725A/AR (5725A/AR)
Accuracy:
Dc current:
Range: l to 10 A
Accuracy:2
Agilent, Model 3458A (3458A)
MULTIMETER
Dc voltage:
Range: 0 to 19.0 V
Accuracy:1 2
1Combined
accuracy of calibrator (dc voltage) and multimeter (dc voltage) is 0.0175%.
2Combined
accuracy of calibrator (dc current) and multimeter (dc voltage) is 0.0625%.
CALIBRATION PROCESS FOR MODEL 7405A-4207
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 table 2.
c. Unless otherwise specified, verify the results of each test and, whenever the test
requirement is not met, take corrective action before continuing with the calibration.
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. Set multimeter for dc voltage measurements. Short INPUT HI and LO and zero
the multimeter. Remove short.
b. Connect equipment as shown in figure 1.