Tektronix 324, Инструкция по эксплуатации

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Performance Check/Calibration—Type 324
i. Set the time-mark generator for 0.5-microsecond
markers.
j. Set the TR IG G E R control for a stable display in
the variable positive-slope area.
k. CHECK—CRT display for optimum linearity and
timing between the first and second vertical lines.
l
. A D JU S T—C402 (see Fig. 5-12B) for optimum line­
arity and timing between the first and second vertical
lines (use low-capacitance screwdriver).
m. Change the following control settings:
T IM E /D IV 1 ys
X 5 H O R IZ MAG Pulled out
n. Set the horizontal POSITION control so the last
marker of the magnified display is positioned to the
tenth vertical line.
o. Set the TR IG G E R control for a stable display in
the variable positive-slope area.
p. CHECK—CRT display for optimum linearity and
timing between the second and tenth vertical lines.
q. A D JU ST—C470 (see Fig. 5-12B) for optimum line­
arity and timing between second and tenth vertical lines
(use low-capacitance screwdriver).
r. Position the third marker of the magnified display
to the first vertical line of the graticule.
s. A D JU S T—C401 (see Fig. 5-12B) for optimum line­
arity and timing between the second and tenth vertical
lines (use low-capacitance screwdriver).
t. Repeat parts b through s of this step until opti­
mum timing and linearity is obtained.
34. Check Normal Sweep Timing Accuracy
a. Push in the X 5 H O R IZ MAG switch.
b. CHECK—Using the T IM E /D IV switch and time-
mark generator settings given in Table 5-4, check normal
TA BLE 5-4
Normal Sweep Timing Accuracy
T IM E /D IV
Time-mark
CRT display Allowable error
switch
generator (markers/
for given
setting
output
division) accuracy
1 ys 1 ys
1 0.32 division
2 ys 1 ys
2 (within 4%)
5 ys 5 ys
1
10 ys
10 ys
1
20 ys
10 ys
2
50 ys
50 ys 1
.1 ms 0.1 ms
1
.2 ms 0.1 ms
2
0.24 division
.5 ms
0.5 ms
1
(within 3%)
1 ms
1 ms
1
2 ms
1 ms
2
5 ms
5 ms 1
10 ms
10 ms
1
20 ms
10 ms
2
50 ms
50 ms
1
.1 s
0.1 s
1
.2 s 0.1 s
n
0.32 division
£
(within 4%)
sweep tim in g within the given tolerances over the
middle eight divisions of the display. Set the TR IG G E R
control as necessary for a stable display in the variable
positive-slope area.
35. Check Magnified Sweep Timing Accuracy
a. Pull out the X5 H O R IZ MAG switch.
b. CHECK—Using the T IM E /D IV switch and time-
mark generator settings given in Table 5-5, check magni­
fied timing within the given tolerances over the middle
eight-division portion of the total magnified sweep
length. Set the T R IG G E R control as necessary for a
stable display in the variable positive-slope area.
c. Disconnect all test equipment and remove the cali­
bration shield.
36. Check/Adjust External Horizontal
O
Position Range
a. Change the following control settings:
Trig/Horiz Coupling E X T T R IG OR H O R IZ
DC
T IM E /D IV E X T H O R IZ
X 5 H O R IZ MAG Pushed in
5-24