TB 9-6625-1914-24
Figure 14. Local oscillator stability.
(8) Calculate horizontal displacement in Hz by multiplying SCAN WIDTH (red)
switch setting (20 kHz) by divisions recorded in (7) above.
Example:
20 kHz x 0.3 div = 6000 Hz
(9) Calculate the demodulation sensitivity by dividing vertical displacement (3
divisions) into horizontal displacement in Hz calculated in (8) above.
Example:
6000 Hz
= 2000 Hz/div
3 div
(10) Set SCAN WIDTH (red) switch to ZERO and adjust FREQUENCY FINE
TUNE control to position signal display line so that it appears in the three-division range
mentioned in (7), (8), and (9) above (fig. 14).
(11) Measure p-p vertical displacement and multiply by demodulation sensitivity
obtained in (9) above. Calculated value will be 10 kHz p-p or less.
b. Adjustments. No adjustments can be made.
32. Final Procedure
a. De-energize and disconnect all equipment.
b. Annotate and affix DA label/form in accordance with TB 750-25.