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Maintenance and Calibration — Type 114
6.
Adjust PER OD CAL control R125
a.
et the Type 114 WIDTH — VARIABLE control to CAL
Turn the WIDTH control to 1 µ
100 µ (see Fig 4-5).
b. Reconnect the Type 114 OUTPUT to the Type 1A1
Channel 1
input through the 50 Ω coax and the 50 Ω
termination.
c. Connect a 50 Ω coax cable from the Type 180A MARK
ER OUT connector to the Type 1A1 Channel 2 input.
Type 180A for 100 microsecond markers.
d.
et the Type 1 A1 Channel 2 VOLT /CM switch to 2
Turn the MODE switch Io CH 2. Pull out the Channel 2 PULL
TO INVERT switch.
e.
et the Type 547 HORIZONTAL DI PLAY switch to B
et the TIME/CM (B) switch to .1 m EC.
ING- OURCE switch to INT-NORM, the
and the MODE switch to TRIG.
LEVEL control for a stable display of the 100 microsecond
markers from the Type 1 80A.
f. Ch a nge the Type 1A1 MODE switch to ALT and the
Channel 1 VOLT /CM switch to 5.
PO ITION controls, position the display so that the peaks of
the pulses from the Type 114 are vertically displaced about
1 mm below the peaks of the inverted pulses from the Type
1 80A on the other trace.
g. Adjust the PERIOD CAL control R125 (se e Fig. 4-6 ) so
that the corresponding pulses in the two traces are aligned
horizontally to within ½ % ( see Fig. 4-7).
4-6
Fig. 4-5, Control settngs for PER OD CAL adjustment .
and the PERIOD control to
et the
et the TRIGGER
LOPE switch to — ,
Adjust the TRIGGERING
Using the Type 1 A1
Fig
4-6 . Location of PER OD CAL control R125.
Fig. 4-7. Crt display showing correct adjustment of PER OD CAL
control.
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