Maximum Attenuation and Rate of Attenuation

Calibration Procedure For Variable Filter, Model 3202(R) Page Navigation
9

TB 9-6625-357-24

b. Adjustments

(1) Adjust C211 (fig. 3) until true rms voltmeter indicates at least 0.03 V (R).

(2) Adjust P203 (fig. 1) until true rms voltmeter indicates at least 0.3 V (R).

(3) Repeat a (6) through (10) above.

(4) Adjust C316 (fig. 3) until true rms voltmeter indicates 0.0631 V (R).

(5) Repeat a (6) through (13) above.

(6) Adjust function generator frequency to 200 kHz as indicated on frequency counter.

(7) Increase C327 (fig. 3) and decrease C316 (fig. 3), or decrease C327 (fig. 3) and

increase C316 (fig. 3), until true rms voltmeter indicates 0.708 V (R).

(8) Repeat a (6) through (16) above.

11. Maximum Attenuation and Rate of Attenuation

a. Performance Check

(1) Set selector switch to LOW PASS X100.

(2) Set CUTOFF FREQ Hz dial to 20.

(3) Adjust function generator frequency to 25 kHz and amplitude for 3 V. True rms

voltmeter will indicate 300 V or less.

b. Adjustments. No adjustments can be made.

12. Final Procedure

a. Deenergize and disconnect all equipment.

b. Annotate and affix DA label/form in accordance with TB 750-25.