TB 9-5210-215-24
IDENTIFICATION AND DESCRIPTION
1. Test Instrument Identification.
This bulletin provides instructions for the
calibration of Digital Protractors, Kell-Strom, Models PRO360 and PRO3600. The
manufacturers' manuals were used as the prime data sources in compiling these
instructions. The equipment being calibrated will be referred to as the TI (test instrument)
throughout this bulletin.
a. Model Variations. Model PRO3600 has an RS-232, 1-pin rectangular port and
2 digits of resolution past the decimal point (up to 10 degrees) on display.
b. Time and Technique. The time required for this calibration is approximately
1 hour, using the physical technique.
2. Forms, Records, and Reports. Forms, records, and reports required for calibration
personnel at all levels are prescribed by TB 750-25.
3. Calibration Description. TI parameters and performance specifications which
pertain to this calibration are listed in table 1.
Table 1. Calibration Description
Test instrument parameter
Performance specifications
Level indication:
Model PRO360
o
Accuracy: 0.1
o
Model PRO3600
Accuracy: 0.05
Angle indication:
Model PRO360
o
o
Range: 360 (90 x 4)
o
o
o
o
o
o
o
o
o
Accuracy: 0.1 (0 to 10 ), 0.2 (10 to 80 ), 0.1 (80 to 90 )
o
o
Model PRO3600
Range: 360 (90 x 4)
o
o
o
o
o
o
o
o
o
Accuracy: 0.05 (0 to 10 ), 0.20 (10 to 80 ), 0.10 (80 to 90 )
EQUIPMENT REQUIREMENTS
4. Equipment Required. Table 2 identifies the specific equipment to be used in this
calibration procedure. This equipment is issued with Secondary Transfer Calibration
Standards Set, AN/GSM-440. Alternate items may be used by the calibrating activity. 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, the actual accuracy of the
equipment selected is shown in parentheses.
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 required: Precision level SPI,
Model 31-050-8.