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Maintenance and Calibration — Type 114
g. Ad|ust C195F (see Fig. 4-16) for 100 nanoseconds pulse
width. Allowable error is ± 3%, however, it is possible to
adjust more closely than this.
Fig. 4-15. Crt display for proper setting of 100 nS Pulse Width
capacitor C195F.
12. Check pulse width accuracy
Using the settings given in Table 4-3, check the pulse width
accuracy in the other settings of the WIDTH control.
TABLE 4-3
Type 114
Type 114
Type 547
PERIOD
WIDTH
TIME/CM
1 m
1 m
.2 m EC
20 µ EC
1 m
100 µ
100 µ
10 µ
2 µ EC
10 µ
1 µ
.2 µ EC
13. Check W DTH — VAR ABLE control range
a.
et the Type 114 WIDTH control to 100^5, set the PE
RIOD control to 10 m
and the PERIOD — VARIABLE control
to CAL.
b.
et the Type 180A for 100 microsecond markers.
c.
et the Type 1A1 Channel 1 VOLT /CM switch to 5.
d.
et the Type 547 TIME/CM (B) to .2 m EC, the TRIG
GERING
LOPE switch to +, and adjust the TRIGGERING
LEVEL control for a stable display.
e.
lowly rotate the WIDTH — VARIABLE control clock
wise. Check for a pulse width of at least 1 millisecond (ten
100 microsecond markers) at the clockwise end of rotation
( see Fig. 4-12).
f.
Return the WIDTH
position.
4-10
Type
180A
Number
Time
of
Markers
Markers
100 µ sec
10
10
10 µsec
1 µsec
10
10 m c
10 cycles
VARIABLE control to the CAL
14. Check operation in square-wave mode
a.
et the Type 114 WIDTH control to
b. Using Table 4-4 check square wave operation for all
positions of the PERIOD control. Allowable period error is
4 mm within the center 8 cm of the trace
TABLE 4-4
Type 114
Type 547
PERIOD
TIME/CM (B)
10 m EC
10 m
1 m
1 m EC
100 µ
.1 m EC
10 µ
10 µ EC
1 µ
1 µ EC
15. Check output amplitude (into the 5012 ter
mination)
a . Turn the Type 114 AMPLITUDE — VARIABLE control
slowly counterclockwise, checking for smooth mechanical and
electrical oporation.
b.
et the Type 1A1 Channel 1 VOLT /CM switch to 1
and check for 3 cm or less of vertical deflection when the
AMPLITUDE
VARIABLE control is fully counterclockwise.
Fig. 4-16. location of 100 nS Pulse Width capacitor C195F.
c.
et the Type 1A1 Channel 1 VOLT /CM switch to 2.
Rotate the Type 114 AMPLITUDE — VARIABLE control fully
clockwise. Check for 5 cm or more of vertical deflection.
d. Change the AMPLITUDE switch to — 3 to 10 V and re
peat the amplitude check. Check both the + and — 1 V to
3 V positions of the AMPLITUDE switch.
QUARE WAVE.
Cycles/8 cm
8
8
8
8
8
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