TB 9-6625-2246-40
Table 2. Minimum Specifications of Equipment Required - Continued
Manufacturer and model
Common name
Minimum use specifications
(part number)
A
RESISTANCE STANDARD
Beckman, Model CR1000M
Range: 100 and 1000 M
(8598966)
ccuracy:4
NO. 2
A
STANDARD RESISTOR
L&N, Model 4025B (8616290)
Value: 10
ccuracy: 6.0 ppm2
NO. 1
A
STANDARD RESISTOR
L&N, Model 4030B (8616291)
Value: 100
ccuracy: 5.25 ppm2
NO. 2
A
STANDARD RESISTOR
L&N, Model 4035B (8616292)
Value: 1 k
ccuracy: 3.4 ppm2
NO. 3
A
STANDARD RESISTOR
L&N, Model 4040B (8616293)
Value: 10 k
No. 4
ccuracy:2
A
STANDARD RESISTOR
L&N, Model 4045B (7907139)
Value: 100 k
NO. 5
ccuracy: 3.4 ppm
A
STANDARD RESISTOR
L&N, Model 4221B (8616294)
Value: 0.1
ccuracy:2
NO. 6
A
STANDARD RESISTOR
General Radio, Model 1444A
Value: 10 k
(MIS-10400)
NO. 7
ccuracy: 2.5 ppm w/test report
'Combined accuracy of calibrator and dc voltage divider is 2.575 ppm when standardized with dc reference standard.
2Combined
accuracy of multimeter and standard resistor Nos. 1, 2, 3, 4, and 6 is 7.65 ppm.
3Combined accuracy of resistance standard No. 1 standardized with resistance measuring system is 5.25 ppm at
1 M and 16 ppm at 10 M .
4Combined accuracy of resistance standard No. 2 standardized with resistance measuring system is 0.013% at 100 M
and 0.127% total (100 M steps) for 1000 M value.
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.
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.
SECTION IV contains the adjustments required to calibrate the TI. Adjustments to be
performed are described in b portion of each paragraph. Additional maintenance
information is contained in the manufacturer's manual for this TI.
d. Unless otherwise specified, all controls and control settings refer to the TI.
