TB 9-4931-287-40
Table 1. Calibration Description - Continued
Test instrument parameters
Performance specifications
Dc milliamperes
Range: 0 to 111 mA
Accuracy: 0 to 11.1 mA, (0. 1% +2 A)
0 to 111 mA, (0.1% +20 A)
EQUIPMENT REQUIREMENTS
calibration procedure. This equipment is issued with Secondary Reference Calibration
Standards Set, NSN 4931-00-621-7878. 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 exceed the minimum use
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. The following peculiar accessory is also required for this calibration:
Hookup wire, shielded pair, untinned copper, solid conductors, No. 18 to 22 AWG (MIS-
10312).
Table 2. Minimum Specifications of Equipment Required
Common name
Minimum use
Manufacturer and model
specifications
(part number)
CALIBRATOR
Range: 0 to 1.85 V
Fluke, Model 5720A (5720A) (p/o
Accuracy: 0.013%
MIS-35947); w amplifier, Fluke
5725A/AR (5725A/AR)
DC CURRENT SHUNT
Range: 10 to 111 mA dc
Guildline, Model 9711 (7912323)
Accuracy: 0.03%
DC POWER SUPPLY
Range: 10 to 111 mA dc
Elgar, Model DCS40-30EM10
(13589313)
DC VOLTAGE DIVIDER
Input - output ratio:
General Resistance, Model
10:1 Accuracy:
DV4107C (MIS-10274)
0.013%
Winslow, Model 336 (7907234) or
DECADE RESISTOR
Range: 0 to 500
Clarostat, Model 240C (240C)
Range: 0 to 112 mV dc
Hewlett Packard, Model 3458A
Accuracy: 0.03%
(3458A)
NULL DETECTOR
Range: 0 to 185 mV dc
John Fluke, Model 845AB
Resolution: 3 V
(845AB)
