TB 9-6625-2132-24
Table 9. Differential Balance
Test instrument
Oscilloscope calibrator
Adjustments (fig. 3)
VOLTS/DIV
Output settings (1 kHz)
Minimum
Minimum
switch settings
(V)
amplitude
spikes
50 mV
50
---
C208C (R)
.1 V
50
---
---
.2 V
100
R109E (R)
C209C (R)
.5 V
100
---
---
1 V
100
---
---
5 V
100
R110E (R)
C210C (R)
2 V
100
---
---
10 V
100
---
---
18. HF and LF-3 dB Point
a. Performance Check
(1) Connect function/arbitrary generator output to TI +INPUT.
(2) Position controls as listed in (a) through (d) below:
VOLTS/DIV switch to 1 V.
(a)
-AC-GND-DC pushbutton to GND.
(b)
LF -3dB POINT switch to DC.
(c)
HF -3dB POINT switch to 1 MHz.
(d)
(3) Set time base TRIGGERING SOURCE pushbutton to INT.
(4) Adjust function/arbitrary generator frequency to 1 kHz and amplitude for 6
divisions of vertical deflection on oscilloscope.
(5) Increase function/arbitrary generator frequency until the oscilloscope CRT
indicate between 0.9 and 1.1 MHz, perform b below.
(6) Repeat technique of (5) above for HF and LF-3dB switch settings and
indications listed in table 10.
(located on right side of TI) for 4.2 divisions of vertical deflection on oscilloscope (R).
19. Final Procedure
a. Deenergize and disconnect all equipment and reinstall protective cover on TI.
b. Annotate and affix DA label/form in accordance with TB 750-25