Tektronix 323, Инструкция по эксплуатации

Страница: 105 / 170

Calibration— Type 323
TABLE 6-3
VOLTS/DIV Compensation
VOLTS/DIV
Adjust fo r optimum
switch Attenuator Square
Flat
setting compensated
Corner Top
.01
- r 1 Compensate P6049 Probe
.02 2 C28B
C28A
.05
4- 5 C29B C29A
Remove external 10X attenuator from generator
.1
-f- 10 C23B
C23A
.2
Check If out of tolerance, compro­
mise setting at .1 and .2
for best overall response
.5 Check
If out of tolerance, compro­
mise setting at .1, .2 and .5
for best overall response
1
-f- 100 C24B C24A
2
Check If out of tolerance, compro­
mise setting at 1 and 2 for
best overall response
Pull X 1 0 VERT GAIN switch
5 Check
If out of tolerance, compro­
mise setting at 1, 2 and 5
for best overall response
10 -r- 1000 C25B C25A
20
Check
If out of tolerance, compro­
mise setting at 10 and 20
for best overall response
e. Connect the 10X probe tip to the trigger compensa­
tion test point (point T, Main board; see Fig. 6-11C). Be sure
the probe is compensated.
f. Set the square-wave generator for a one kHz-five-divi-
sion vertical display on the test oscilloscope. Disregard
overshoot or rounding and adjust for five divisions as meas­
ured between trailing edges of square waves. See Fig.
6-11(A).
g. CHECK—Test oscilloscope display for about one-divi­
sion front-corner rounding at normal CRT intensity, similar-
to Fig. 6-11 A. An undercompensated waveform is shown in
Fig. 6-11(B).
h. ADJUST— C201 (see Fig. 6-11C) for about one-division
front-corner rounding as shown in Fig. 6-11 A. More rounding
may reduce triggering circuit frequency response and less
rounding may produce unstable triggering.
26. Adjust External Trigger Compensation O
a. Change the following control settings:
Trig/Horiz Coupling EXT TRIG DC
EXT TRIG OR 10X
HORIZ ATTEN
(side panel)
Fig. 6 -1 1 . (A ) Typical test oscilloscope d isp la y showing correct
in te rn a l trig g e r com pensation, IB) undercompensated w aveform , (C)
location o f trig g e r com pensation test p o in t and adjustm ents (M ain
b o a r d ) .
6 -1 6