TB 9-4931-406-40
Vacref = value from (7) above.
Where:
mVstd = value from (9) above.
refmVstd = value from (11) above.
Dstd = AC/DC difference of standard thermal converter
from the test report.
-
1
-
1-
=
formula:
.8
Where:
Vac = value calculated in (12) above.
Vacref = value calculated in (7) above.
mVTI = value from (9) above.
refmVTI = value from (11) above.
(14) Repeat technique of (8) through (13) above for all desired TI test frequencies.
b. Adjustments. None.
10. Calibration Test Report. A calibration test report is required for this TI.
The
purpose of the test report is to allow utilization of:
a. Instruments whose values have drifted outside the manufacturers' specifications
when referenced to nominal values, yet the drift rate is sufficiently low to allow use within
manufacturers' specified accuracy of the previous test report value.
b. Instruments that have values and stability greater than the manufacturers'
specifications and may be utilized at greater accuracies when test report values are used.
The performance specifications shall be ascertained by referencing present measurement
values to previous measured values in lieu of present to nominal values. If present
measured values are not within manufacturers' accuracy specification of last measured
values, the TI must be red-tagged. Calibration activities will maintain a case history file of
test reports for the TI for information purposes only. If TI was repaired, it should be noted
as such on the test report. All previous test reports will be discarded and a new case
history shall be started from date of repair.
11. Final Procedure
a. Deenergize and disconnect all equipment.
b. Annotate and affix DA label/form in accordance with TB 750-25.
