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Maintenance and Calibration — Type 114
f.
Using Table 4-2, check the period accuracy of the re
maining settings of the PERIOD switch. In all cases the ac
curacy should be as specified.
9.
Check PER OD — VAR ABLE control for a
range of 10:1 or more
a.
et the Type 114 PERIOD control to 10 m
WIDTH control to 100 µ .
b. Turn the Type 1A1 MODE switch to CH 1.
c.
et the Type 547 TIME/CM |B| to .1
d. Rotate the PERIOD
VARIABLE control clockwise. Check
that a display of 1 marker/cm is obtainable ( 10: 1).
Type 114
PERIOD
10 m
1 m
100 µ
10 µ
1 µ
4-8
and the
EC.
Fig. 4-11. Control settings for adjusting W DTH CAL control R18O.
TABLE 4-2
Type 547
Type 114
WIDTH
TIME/CM (B)
10 m EC
10 µ
1 m EC
10 µ
.1 m EC
1 µ
100 n
10 µ EC
1 µ EC
100 n
10. Adjust W DTH CAL control R180
a.
et the Type 114 PERIOD and WIDTH controls to 1 m
and turn both VARIABLE controls to CAL (see Fig. 4-11).
b.
et the Type 180 A for 100 microsecond markers.
C. Turn the Type 1A1 MODE switch to ALT.
d.
et the Type 547 TIME/CM ( B ) to .2 m EC and adjust
the TRIGGERING LEVEL control for a stable display.
e. Use the Type 1A1 PO ITION controls to obtain the dis
play shown in Fig. 4-12.
f
Adjust the WIDTH CAL control R180 (see Fig. 4-13) for
a positive pulse width of 1 millisecond (ten 100 microsecond
periods) using the time markers from the Type 180A as
reference.
g. Check to see that WIDTH > PERIOD light is on.
Error
Type 180A
Markers
10 milliseconds
±3%
1 millisecond
±3%
Adjusted to < ½%
100 microseconds
10 microseconds
±3%
Adjusted to < 3%
1 microsecond
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