Tektronix 114 - Page 22

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 PERIOD — VARIABLE control for a
range of 10:1 or more
a. Set the Type 114 PERIOD control to 10 mS and the
WIDTH control to 100 µ S.
b. Turn the Type 1A1 MODE switch to CH 1.
c. Set the Type 547 TIME/CM |B| to .1 SEC.
d. Rotate the PERIOD VARIABLE control clockwise. Check
that a display of 1 marker/cm is obtainable ( 10: 1).
10. Adjust WIDTH CAL control R180
a. Set the Type 114 PERIOD and WIDTH controls to 1 mS
and turn both VARIABLE controls to CAL (see Fig. 4-11).
b. Set the Type 180 A for 100 microsecond markers.
C. Turn the Type 1A1 MODE switch to ALT.
d. Set the Type 547 TIME/CM ( B ) to .2 mSEC and adjust
the TRIGGERING LEVEL control for a stable display.
e. Use the Type 1A1 POSITION 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.
Fig. 4-11. Control settings for adjusting WIDTH CAL control R18O.
TABLE 4-2
Type 114
PERIOD
Type 114
WIDTH
Type 547
TIME/CM (B)
Type 180A
Markers
Error
10 mS
10 µS
10 mSEC
10 milliseconds ±3%
1 mS 10 µ S
1 mSEC 1 millisecond
±3%
100 µ S
1 µ S
.1 mSEC 100 microseconds
Adjusted to < ½%
10 µ S
100 nS
10 µ SEC 10 microseconds ±3%
1 µ S
100 nS
1 µ SEC
1 microsecond
Adjusted to < 3%
4-8