TB 9-4931-702-50
SECTION II
EQUIPMENT REQUIREMENTS
4. Equipment
Required. Table 2 identifies the
specific equipment used in this
calibration procedure. This equipment is issued with secondary reference calibration
standards set 4931-621-7878 and is to be used in performing this procedure. Alternate
items may be used by the calibrating activity when the equipment listed in table 2 is not
available. 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 specifications listed in table 2. The accuracies listed in table 2 provide a
four-to-one accuracy 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.
5. Accessories Required. The
accessories listed in table 3 are
issued .with
secondary
reference calibration standards set 4931-621-7878 are to be used in this calibration
procedure. When necessary, these items may be substituted by equivalent items unless
specifically prohibited.
Table 2. Minimum Specifications of
Equipment Required
Minimum Use
Manufacturer, Model And Part Number
Item
Common Name
Specifications
A1
DC VOLTAGE
Range: 1.0 to 1.1 volts in 1
John Fluke, Model 332A (7911393) Or John
STANDARD
microvolt steps; 10.0 to 11
Fluke, Model 332B/AF (6625-150-6994)
volts in 1-microvolt steps.
A2
NULL DETECTOR
Resolution: 0.25 ppm1
John Fluke, Model 845AB (6625-445-3333)
A3
STANDARD CELL
Test report specification
Guildine, Model 9154B (MIS-10364)
Accuracy: 0.25 ppm
A4
VOLTAGE DIVIDER
ESI, Model RV-726 (MIS-10295)
1Prior to using the NULL DETECTOR, determine sensitivity on the 3 and 10 V ranges, using A1 and A4.
Item
Common Name
Description And Part Number
B1
SENSITIVITY SWITCH
Sensitivity and reversing switch; galvanometer key (7913207)
B2
WIRE
No. 18 AWG, shielded pair, solid copper conductor; electrical power
cable (MIL-10312).
SECTION III
6. Preliminary Instructions
a. The instructions outlined in this paragraph are preparatory to the calibration
process. Personnel should become familiar with the entire bulletin before beginning the
calibration.