(a) If TI indication exceeds the tolerance limitation (rejection tolerance)
listed in table 7, the TI will be rejected.
(b) If the TI indication exceeds the correction tolerance listed in table 7,
but does not exceed the rejection tolerance, prepare a correction chart,
specifying the scale correction.
h. Temperature Calibration
(1) Performance Check
NOTE: This entire calibration procedure will be used to calibrate all TI's until a 3-year
history of stability is established. The TI's will then be given only the zero point
temperature check, paragraph 7g above, after stability criteria have been satisfied.
(a) Connect equipment as shown in figure 23.
(b) Prepare temperature standard (A9).
(c) Insert resistance thermometer (A6) into temperature standard.
(d) After at least 3 minutes, operate resistance bridge (A5) at 2
milliamperes as indicated by current measuring system, and record bridge
indication.
NOTE: Current measuring system consists of power supply (A4), dc current shunt (A2),
and digital voltmeter (A1).
(e) Repeat (d) above three times.
(f) Determine average of indications recorded in (d) above.
(g) Refer to calibration table for resistance thermometer and determine by
interpolation the table resistance ratio value for 0.01 C.
(h) Divide the resistance obtained in (f) above by the resistance ratio for
0.01,C. Record this value as R,.
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