18. .2MV/CM DIFF BAL. Place the SENSITIVITY
switch in the 200 /xVOLTS PER CM position and
position the trace so that it lies behind the
appropriate horizontal centerline. Adjust the
.2MV/CM DIFF BAL control for minimum vertical
deflection. Repeat steps 17 and 18 until both
adjustments are correct.
19. .2V/CM GAIN ADJ. Apply 1-volt signals
from the calibrator to input A of the vertical-
amplifier. Set the Input Selector switch in the
A DC position and the SENSITIVITY switch in the
.2 VOLTS PER CM position. Set the .2/CM GAIN
ADJ for 5 centimeters of vertical deflection.
20. .2MV/CM GAIN ADJ. Apply 1-millivolt sig
nals from the calibrator to input A of the vertical
amplifier. Place the SENSITIVITY switch in the
200/xVOLTS PER CM position. Set the .2MV/CM
GAIN ADJUST for 5 centimeters of vertical de
flection. Repeat steps 19 and 20 until both ad
justments are correct.
Fig. 6-8. Setting the .2V/CM GAIN ADJ control.
In step 19 of the recalibration procedure, the .2V/CM
GAIN ADJ control is adjusted for 5 centimeters of
vertical deflection.
A B C
Fig. 6-9. Adjustment of the high frequency compensating capacitors.
Waveforms A and B are typical waveforms resulting from misadjusted ca
pacitors. All capacitors in steps 21 through 28 of the recalibration proce
dure should be adjusted to obtain waveforms having a minimum of distor
tion. Waveform C shows the display obtained with properly adjusted
capacitors.
21. C410. Apply 1-kc square-waves from the
Type 105 Square-Wave Generator to input con
nector A of the vertical amplifier through the
CS47 Capacitance Standardizer. Place the
SENSITIVITY switch in the .2 VOLTS PER CM
position. Adjust C410 for an undistorted square-
wave.
22. C440. Apply 1-kc square-waves from the
Type 105 to input connector B of the vertical am
plifier through the CS47 Capacitance Standard
izer. Place the Input Selector switch in the B DC
position and adjust C440 for an undistorted
square-wave.
23. C406A and C406C. Apply 1-kc square-
waves from the Type 105 to input connector A
of the vertical amplifier through the CS47 Ca
pacitance Standardizer. Place the Input Selector
switch in the A DC position and the SENSITIVITY
switch in the 2 VOLTS PER CM position. Adjust
the output of the Type 105 for approximately
3 cm of vertical deflection. Adjust C406A and
C406C for an undistorted square-wave.
24. C406G and C406J. Place the SENSITIVITY
switch in the 5 VOLTS PER CM position and ad
just the Type 105 output for approximately 3 cm
of vertical deflection. Adjust C406G and C406J
for an undistorted square-wave.
25. C407A and C407C. Connect 1-kc square-
waves from the Type 105 to input connector B of
the vertical amplifier through the CS47 Capaci
tance Standardizer. Place the Input Selector
6-6
RECALIBRATION PROCEDURE — TYPE 502
®
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