TB 9-6625-2003-24
(2) Adjust R3 (fig. 2) for a full-scale (50) indication on TI (R).
Figure 2. Adjustment location.
10. Frequency Response
a. Performance Check
(1) Set impedance switches to X10 60 and DECIBELS MULTIPLY BY switches to
0-1.
(2) Adjust calibrator frequency for 1 kHz and output for an 11 dB indication on TI
meter. Record calibrator indication.
(3) Adjust calibrator frequency for 150 Hz and output for calibrator indication
recorded in (2) above. TI meter will indicate between 10.5 and 11.5 dB.
(4) Repeat technique of (3) above for frequencies of 20, 500, 2500, and 10,000 Hz.
TI meter indication will be between 10.5 and 11.5 dB at 500 and 2500 Hz, and between 9.5
and 12.5 at 20 and 10,000 Hz.
b. Adjustments. No adjustments can be made.
11. Final Procedure
a. Deenergize and disconnect all equipment and reinstall TI protective cover.
b. Annotate and affix DA label/form in accordance with TB 750-25.
