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Calibration—214 Service
TRIGGER CIRCUIT
Equipment Required
1,
Low-Frequency
Constant-Amplitude
Signal
Gen-
erator (General Radio 1310-B Oscillator)
2. 42-inch 50 Q BNC Cable
3. Probe tip-to-BNC Cable
4.
BNC-T Connector
5.
BNC-to-Banana Plug Adapter
6. Three-inch Screwdriver
Control Settings
Preset
instrument
controls
to the settings given
under
Preliminary Control Settings except as follows:
INTENSITY
Visible Display
SEC/DIV
1.0m
CH 1 INPUT COUPLING
DC
CH 1 POS
OFF
CH 2 POS
Midrange
TRIG SOURCE
CH 2
21. Adjust AUTO PRESET Level
a. Connect
the
CH 2
probe
tip to the
output
of the
Low-Frequency
Signal
Generator
(General
Radio
1310-B
Oscillator)
via a BNC-T connector and a probe tip-to-BNC
adapter.
b. Adjust
the
Low-Frequency
Signal
Generator
for
a
0.2-division display of a 5-kHz signal.
c. CHECK—For
a stable display.
d. ADJUST—AUTO
PRESET,
R375
(located
on
the
side panel) for a stable display.
22. Check Trigger Circuit Operation
a. Set the CH 2 VOLTS/DIV switch to 1 V.
b, Adjust
the
Low-Frequency
Signal
Generator
for
a
1-division display of a 500-kHz signal.
c. Set the CH 2 VOLTS/DIV
switch to 5 V.
d. CHECK—A
stable
display
can
be
obtained
by
ad-
justing the
LEVEL/SLOPE
control
to trigger on both the
positive-going
and
negative-going
slopes
of the
displayed
waveform.
REV B APR 1980
e. Return
the
LEVEL/SLOPE
control
to the AUTO
PRESET detent.
f. Set the TRIG SOURCE switch to COMP.
g. CHECK—A
stable
display
can
be
obtained
by
ad-
justing the
LEVEL/SLOPE
control
to trigger on both the
positive-going
and
negative-going
slopes
of the
displayed
waveform.
h. Set
the
TRIG
SOURCE
switch
to
EXT
and
the
LEVEL/SLOPE
control to the AUTO
PRESET detent.
i. Connect
the unused
output of the BNC-T
connector
to the 214 EXT TRIG
input via a 42-inch 50 Q BNC cable
and a BNC-to-banana plug adapter.
j. CHECK—A
stable
display
can
be
obtained
by
ad-
justing the LEVEL/SLOPE
control to trigger on both the
positive-going
and
negative-going
slopes
of the
displayed
waveform.
23. Check Single Sweep Operation
a. Adjust
the
LEVEL/SLOPE
control
for
a triggered
display.
b.
Disconnect
the
CH2
probe
tip
from
the
signal
source.
c.
Depress the SINGLE SWP button.
d. Press the RESET button.
e. CHECK—READY
light
comes
on
when
RESET
button
is pressed and remains on until the CH 2 probe tip is
re-applied to the signal source.
4-13
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