Figure 4-19. Signal Wave Form, Showing Noise Superimposed.

TM 11-6660-204-25

(1) If noise appears on the oscilloscope at the

NOTE

bottom of the waveform (1, fig. 4-19), try counter-

Do not turn either potentiometer, espe-

clockwise rotation of potentiometer R306 and clock-

cially R306, too far counterclockwise be-

wise rotation of potentiometer R304.

cause high frequency signals may be lost.

(2) If noise appears on the oscilloscope at the top

Changes should be made in small incre-

of the waveform (2, fig. 4-19), try clockwise rotation

ments and the effect of each change should

of potentiometer R306 and counterclockwise rota-

be checked carefully. Counterclockwise ro-

tion of potentiometer R304.

tation of potentiometers R304 and R306

(3) If noise appears on the oscilloscope at the top

tends to increase the response time of the

and bottom of the waveform (3, fig. 4-19), try coun

circuit to sudden drops in signal ampli-

terclockwise rotation of potentiometer R304 and

tude.

R306.

Figure 4-19. Signal Wave Form, Showing Noise Superimposed.

Change 3