TB 9-4931-287-40
(10) Adjust output of calibrator to 0.182 V and set FUNCTION switch to OUTPUT .1.
(11) Readjust calibrator to obtain best null on null detector. Calibrator output will be
between 0.18186 and 0.18214 V.
b. Adjustments. No adjustments can be made.
9. Final Procedure
a. Deenergize and disconnect all equipment.
b. Annotate and affix DA label/form in accordance with TB 750-25.
CALIBRATION PROCESS FOR JAMES BIDDLE MODEL 72-310
Preliminary Instructions
a. The instructions outlined in paragraphs 10 and 11 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 name as listed in table 2.
c. Unless otherwise specified, verify the result 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. Additional
maintenance information is contained in the manufacturer's manual for this TI.
d. Unless otherwise specified, all controls and control settings refer to the TI.
Equipment Setup
a. Turn FUNCTION switch to OFF.
b. Mechanically zero TI galvanometer, using adjustment screw on meter cover.
c. Insure that TI contains fresh batteries.
Output Accuracy
a. Performance Check
(1) Position controls as listed in (a) through (c) below:
EMF switch to A.
(a)
MILLIVOLT switch to 0.
(b)
MILLIVOLT control to 0.
(c)
(2) Press and lock DET switch.
(3) Turn FUNCTION switch to STD and adjust STD control for null on TI
galvanometer.
