SECTION IV CALIBRATION PROCESS FOR CONTROLLABLE INTERFACE BOX (CIB)

TB 9-4910-556-35

(9) Adjust synthesizer/function generator for square wave (positive pulse) output of

7 to 13 V and 4500 rpm indication on VTM display. Synthesizer/function generator will

indicate between 149.1 Hz (6.70 ms) and 150.8 Hz (6.63 ms).

(10) Repeat technique of (9) above for indications

listed

table

Synthesizer/function generator will indicate within limits specified.

(11) Set VTM power switch to OFF.

b. Adjustments. No adjustments can be made.

Table 5. RPM

VTM

Frequency counter indications

display

Min

Max

indications

4000

132.50

7.45

134.16

7.54

3000

99.16

9.91

100.83

10.08

2000

65.83

14.80

67.50

15.19

1000

32.50

29.27

34.16

30.76

300

9.16

92.33

10.83

109.17

SECTION IV

CALIBRATION PROCESS FOR

CONTROLLABLE INTERFACE BOX (CIB)

16. Preliminary Instructions

a. The instructions outlined in paragraphs 16 and 17 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 tables 2 and 3.

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 TM 9-4910-751-14&P for this TI.

d. Unless otherwise specified, all controls and control settings in this section refer to

the controllable interface box (CIB).