TB 9-5220-212-40
EQUIPMENT REQUIREMENTS
4. Equipment Required. Table 2 identifies the specific equipment to be used in this
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 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 ratio between the standard and TI. Where
the four-to-one ratio cannot be met, four-to-one accuracy of the equipment selected is shown
in parentheses.
Table 2. Minimum Specifications of Equipment Required.
Manufacturer and model
Common name
Minimum use specifications
(part number)
Kollmorgen, Model K221
AUTOCOLLIMATOR
Range:
10 minutes
(7911743), K10 w/
W/ ACCESSORY
Accuracy: 0.6 s of arc
for any 1 minute of arc accessories (7912242)
EQUIPMENT
DIFFERENTIAL
Range:
10 minutes
Federal Products Corp.,
ELECTRONIC LEVEL
Model 232P68 (7916264)
Accuracy: 0.6 s of arc
5. Accessories Required. The accessories listed in table 3 are issued as indicated in
paragraph 4 above and are used in this calibration procedure. When necessary, these items
may be substituted by equivalent items, unless specifically prohibited.
Common name
Description (part number)
BENCH LEVEL
Federal Specification GGG-L-21A, Type II, Class B,
Style 2 (7902565)
C-CLAMP 1
Part of calibration tool kit (7959911)
STRAIGHT EDGE
48-in., steel (7903703)
STRAIGHT EDGE
72-in., steel (MIS-S15769, Type 2)
1 Two required.
CALIBRATION PROCESS USING AUTOCOLLIMATOR
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
c. Unless otherwise specified, verify the result of each test and, whenever the test
requirement is not met, take corrective action before continuing with the calibration.
Adjustments required to calibrate the TI are included in this procedure. Additional
maintenance information is contained in manufacturer's manual for this TI.
d. Unless otherwise specified, all controls and control settings refer to the TI.