TB 9-6685-322-50
NOTE
Unless otherwise specified, verify the results of each test and
take corrective action whenever the test requirement is not
met before continuing with the calibration. Adjustments
required to calibrate the TI are in this procedure. Additional
maintenance information is in the manufacturer's manuals and
NBS Monograph 150.
NOTE
In performing paragraph 8 below, total immersion type
thermometers will be inserted to a depth sufficient to cover the
32 F (0 C) graduation. In paragraphs 9 and 10 below, the
mercury column of total immersion thermometer must be as
near the liquid surface as possible. Partial-immersion type
thermometers will be inserted to the depth of the immersion
line etched on the stem.
NOTE
Before calibrating thermometer 7915890, make ZERO and
SPAN adjustment in accordance with the manufacturer's
manual.
NOTE
used to calibrate thermometers that are difficult to read
through the prism used in figure 1. Paragraph 9 is suitable for
thermometers that do not present a reading difficulty.
8. Ice Point
a. Performance Check
(1) Place container (B2) on work area.
(2) Select clear ice made from pure water, rinse with cold pure water, and shave or
crush into small pieces.
(3) Put ice into container to a depth of approximately 4 inches.
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