TB 9-6625-2275-24
IDENTIFICATION AND DESCRIPTION
1. Test Instrument Identification. This bulletin provides instructions for the calibration of
AC Divider, Fluke, Model 7405A-4207 and Current Shunt, Fluke, Model 80J-10. DA Form
3758, Calibration and Repair Requirements Worksheet, was used as the prime data source
in compiling these instructions. The equipment being calibrated will be referred to as the
TI (test instrument) throughout this bulletin.
a. Model Variations. None.
b. Time and Technique. The time required for this calibration is approximately 1
hour using the dc and low frequency technique.
2. Forms, Records, and Reports. Forms, records, and reports required for calibration
personnel at all levels are prescribed by TB 750-25.
3. Calibration Description. TI parameters and performance specifications which
pertain to this calibration are listed in table 1.
Table 1. Calibration Description
Test instrument
parameters
Performance specifications
Fluke, Model 7405A-4207
Ratio
Value: 1000:1
Voltage range: 20 V maximum
Frequency: Dc to 50 kHz
(23 C 5 C)
Accuracy:
0.07% (ac only)
0.07% + 5 V (dc only)
(Temperature coefficient: 25 ppm/ C)
Fluke, Model 80J-10
Shunt
Range: 0 to 10 A
Frequency: Dc to 10 kHz
Accuracy:
0.25%
EQUIPMENT REQUIREMENTS
calibration procedure. This equipment is issued with Secondary Transfer Calibration
Standards Sets AN/GSM-286, AN/GSM-287 or AN/GSM-705. Alternate items may be used
by the calibrating activity. The items selected must be verified to perform satisfactorily
prior to use and must bear evidence of current calibration. The equipment must meet or
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.
