TB 9-5210-202-40
IDENTIFICATION AND DESCRIPTION
1. Test Instrument Identification.
This bulletin provides instructions for the
calibration of Optical Flats (Set of Four) 7902794. The manufacturer's manual and
MIL-0-26901 (USAF) were used as the prime data source in compiling these instructions.
The optical flats (set of four) will be referred to as the TI (test instrument) throughout this
bulletin.
a. Model Variations. None.
b. Time and Technique. The time required for this calibration is approximately 2
hours, using the physical technique.
2. Forms, Records, and Reports
a. Forms, records, and reports required by calibration personnel at all levels are
prescribed by TB 750-25.
b. Adjustments to be reported are designated (R) at the end of the sentence in which
they appear. When adjustments are in tables the (R) follows the designated adjustment.
Report only those adjustments made and designated with (R).
3. Calibration Description. TI parameters and performance specifications which
pertain to this calibration are listed in table 1.
Test instrument parameters
Performance specifications
Flatness
Accuracy: 0.000001 in.
EQUIPMENT REQUIREMENTS
4. Equipment Required. This equipment is issued with the Secondary Reference
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.
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:
Monochromatic Light, Helium glass tube 11.6 in. wavelength, Van Keurin, Model C-2
wavelength (7902779).