Low-Frequency Compensation

TB 9-6625-149-50

b. Adjustments. Adjust Z-IN ADJ. R452 (fig. 4) until amplitude of waveform is

equal to amplitude recorded in a(6) above.

25. Low-Frequency Compensation

a. Performance Check. Adjust controls of oscilloscope (A7) and TI for 4 centimeters

of vertical deflection. If leading and trailing edges of waveform are unequal in amplitude,

perform b below.

b. Adjustments. Adjust L.F. ADJ. R481 (fig. 4) until leading and trailing edges of

waveform displayed on oscilloscope are of equal amplitude. (R)

Figure 4. Current probe amplifier - typical left - interior view (types 131-1 through -4).

26. Amplifier Gain

a. Performance Check

(1) Turn TI CURRENT/DIV. switch to 1 mAMP.

(2) Turn plug-in (A8) VARIABLE VOLTS/CM control to CALIBRATED.

oscilloscope (A7) does not indicate 4 centimeters of vertical deflection, perform b below.

b. Adjustments. Adjust GAIN ADJ.

R464 (fig. 4) for 4 centimeters of vertical

deflection on oscilloscope. (R)