TB 9-6625-113-24
a. Instruments whose values may have drifted outside manufacturer's specifications
when referenced to nominal values, yet the drift rate is sufficiently low to allow use within
manufacturer's specified accuracy of the previous test report value.
b. Instruments that have values and stability better than manufacturer's specifications
may be utilized at greater accuracies when test report values are used. The performance
specifications shall be ascertained by referencing present measured values to previous
measured values, in lieu of present to nominal values. If present measured values are not
within manufacturer's accuracy specifications of last measured value, the TI must be red-
tagged. Calibration activities will maintain a case history file of test reports for the TI.
The file will contain an accumulation of at least six of the most recent test reports. If in
four successive calibrations the measured value drifts from the nominal value as much as
three times the manufacturer's accuracy specification, the TI must be red-tagged. An
example of calibration data to be annotated on the test report is shown on the sample test
report.
c. The sample test report is included in appendix A.
a. De-energize and disconnect all equipment.
b. Annotate and affix DA label/form in accordance with TB 750-25.
CALIBRATION PROCESS FOR DECADE CAPACITOR
IET MODEL HACS-Z-B-3E-1F
11. Preliminary Instructions
a. The instructions outlined in paragraphs 11 and 12 are preparatory to the calibration
process. Personnel should become familiar with the entire bulletin before beginning the
calibration.
b. Items of equipment used in this procedure are referenced within the text by common
c. Unless otherwise specified, verify the results of each test and, whenever the test
requirement is not met, take corrective action before continuing with the calibration.
Adjustments required to calibrate the TI are included in this procedure.
d. Unless otherwise specified, all controls and control settings refer to the TI.