Tektronix 323, Instruction Manual

Page: 111 / 170

Calibration— Type 323
g. ADJUST—C446 (see Fig. 6-17B) for optimum linearity
mid liming between flic sixth arid tenth vertical lines.
h. Set the time-mark generator for 0.5-microsecond mark­
ers.
i. Set the TIME/DIV switch to 5 /us.
j. Set the TRIGGER control for a stable display.
k. CHECK— CRT display for optimum linearity and timing
between the second and tenth vertical lines (see Fig. 6-17C).
l
. ADJUST—C454 (see Fig. 6-17B) for optimum linearity
and timing between the second and tenth vertical lines.
m. CHECK— CRT display for optimum linearity and timing
between the left (first) vertical line of the graticule and the
fourth vertical line (see Fig. 6-17C).
n. ADJUST— C432 (see Fig. 6-17B) for optimum linearity
and timing between the left (first) vertical line of the grati­
cule and the fourth vertical line.
o. Repeat parts c through n of this step until optimum
timing and linearity is obtained.
37. Check Normal Sweep Timing Accuracy
a. Change the following control settings:
TRIGGER Stable positive-slope
triggering
X10 HORIZ MAG Pushed in
TABLE 6-4
Normal Sweep Timing Accuracy
TIME/DIV
switch
setting
Time-mark
generator
output
CRT display
( m arkers/
division)
A llow a ble
error fo r
given
accuracy
5 fxs
5 microsceond 1 0.24 division
1 0 yAS
10 microsecond 1
(within 3%)
20 fis
10 microsecond 2
50 [is
50 microsecond 1
.1 ms
0.1 millisecond 1
.2 ms
0.1 millisecond 2
.5 ms
0.5 millisecond
1
1 ms
1 millisecond
1
2 ms
1 millisecond 2
5 ms
5 millisecond 1
10 ms
10 millisecond
1
20 ms
10 millisecond
2
50 ms
50 millisecond
1
.1 s
0.1 second
1
,2 s
0.1 second 2
.5 s
0.5 second 1 0.32 division
1 s
1 second 1
(within 4%)
b. CHECK— Using the TIME/DIV switch and time-mark
generator settings given in Table 6-4, check normal sweep
timing within the given tolerances over the middle eight divi­
sions of the display. Set the TRIGGER control as necessary
for a stable display in the variable positive-slope area.
38. Check Magnified Sweep Timing Accuracy
a. Change the following control settings:
TRIGGER Stable positive-slope
triggering
X10 HORIZ MAG Pulled out
b. CHECK— Using the TIME/DIV switch and time-mark
generator settings given in Table 6-5, check magnified tim­
ing within the given tolerances over the middle eight-division
portion of the total magnified sweep length. Set the TRIG­
GER control as necessary for a stable display in the variable
positive-slope area.
c. Disconnect all test equipment and remove the calibra­
tion shield.
TABLE 6-5
M agnified Sweep Timing Accuracy
TIME/DIV
switch
setting
Time-mark
generator
output
CRT display
( m arkers/
division)
A llow a ble
error for
given
accuracy
5 /x s
0.5 microsecond 1
0.4 division
10 [is
1 microsecond 1
(within 5%)
20 [is 1 microsecond 2
0.32 division
50 [is 5 microsecond
1
(within 4%)
.1 ms 10 microsecond 1
.2 ms 10 microsecond 2
.5 ms 50 microsecond 1
1 ms
0.1 millisecond 1
2 ms
0.1 millisecond 2
5 ms 0.5 millisecond 1
10 ms
1 millisecond 1
20 ms 1 millisecond 2
50 ms
5 millisecond 1
.1 s
10 millisecond 1
,2 s 10 millisecond 2
.5 s 50 millisecond
1
0.4 division
1 s 0.1 second 1
(within 5%)
6 - 2 2