TB 9-5855-1891-40
Table 2. Minimum Specifications of Equipment Required
Manufacturer and model
Common name
Minimum use specifications
(part number)
GAGE BLOCK NO. 1
Accuracy: Approximately 0.010 in.
(7901267) Gage block set, 28
thick
pieces
Accuracy:1
GAGE BLOCK NO. 2
(7901363) Gage block set, 8
pieces
2
REFERENCE MIRROR
Accuracy: Flatness to within l/5
(13335499)
fringe of monochromatic light
Accuracy: 0.000075 in.
36"X48"
SURFACE PLATE
Class 1 Grade A
1 Used
to place height of lab standard mirror reflecting surface in light path of UPPER MIRROR and LOWER MIRROR.
2
Reference mirror will be called lab standard mirror throughout this calibration procedure.
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.
Adjustments required to calibrate the TI are included in this procedure. Additional
maintenance information is contained in TM 9-5855-286-14 and DMWR 9-5855-286.
7. Equipment Setup
HIGH VOLTAGE is used or exposed during the performance of
this calibration.
DEATH ON CONTACT may result if
personnel fail to observe safety precautions.
REDUCE
OUTPUT(S) to minimum after each step within the
performance check where applicable.
a. Remove optics assembly from container case and stand optics assembly upright on
surface plate.
b. Remove AUTOCOLLIMATOR from container case, loosen two CLAMP SCREWS,
and slide AUTOCOLLIMATOR into TI until it seats (fig. 1).
c. Tighten two CLAMP SCREWS (fig. 1).
