TB 9-5985-316-24
EQUIPMENT REQUIREMENTS
calibration procedure. This equipment is issued with Secondary Transfer Calibration
Standards Set 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 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 the
calibration procedure. The following peculiar accessories are also required for this
calibration: Decade Resistor, Winslow, Model 336 (7907234) or Clarostat, Model 240C
(240C) and voltage divider, 600 , double banana plug to triple banana jack (11047A)
(7911560).
NOTE
The voltage divider accuracy of 1.0 percent is critical in
calibration process.
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 MIS-
Range: 30 V
35947); w amplifier, Fluke 5725A/AR
Accuracy: +0.15%
(5725A/AR)
Ac voltage
Range: 0.3162 to 31.62 V
Frequency: 1.0 kHz to 1.0 MHz
Accuracy: Varying between
+0.15% @ 1.0 kHz to +2.25% @ 1.0
MHz.
Range: 0.5 mV to 30 V dc
Hewlett Packard, Model 3458A (3458A)
Accuracy: 0.15%
TRUE RMS VOLTMETER
Range: 0.3 to 316.2 mV ac
Fluke, Model 8922A/AA (8922A/AA)
Frequency: 1.0 kHz to 1.0 MHz
Accuracy: Nominal
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.