TB 9-6685-322-50
SECTION I
IDENTIFICATION AND DESCRIPTION
This bulletin provides instructions for the
1. Test Instrument Identification.
calibration of Self-Indicating Thermometers (-38C to +250C) and (-38F to +482F)
(General). The manufacturers' instruction manuals and NBS Monograph 150 were, used as
the prime data source In compiling these instructions. The equipment being calibrated will
be referred to as the TI (test instrument) throughout this bulletin.
a. Model Variations. Thermometer types vary in range, accuracy, and immersion
depth. This Is a general procedure for thermometers covering the ranges of -38F to
+482F and -38C to +250C.
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 for 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.
Table 1. Calibration Description
Test instrument parameters
Performance specifications
Temperature
Range: -38C to +250 C
Accuracy:
Temperature
Range: -38F to +482F
Accuracy:
SECTION II
EQUIPMENT REQUIREMENTS
4. Equipment Required. Table 2
identifies the
specific equipment to be
used in this
calibration procedure. This equipment is Issued with the 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.
2