2212 Service Manual
Performance Tests
Step
5.
Check External Trigger Range
a.
SET:
VOLTS/DIV
(CH
1)
........ 0.5 V
SEC/DIV .... .
.. .. ..
.
..
..
...... .
..
2 0 µs
Trigger COUPLING........
AC
Trigger SLOPE ............... Positive Going
b.
Connect the leveled sine-wave generator output via a 50 n
BNC
coaxial cable, a
50
n termination
and
a dual-input coupler,
to the
CH
1
OR
X
and
the
EXT
INPUT
OR
Z
input
connectors.
c. Set the leveled sine-wave generator to produce a five-division
display at an output frequency of 50 kHz.
d.
Position the waveform equally around the center horizontal
graticule line.
e.
SET:
Trigger MODE.....................
NORM
Trigger SOURCE.................
EXT
f.
CHECK
- That the display is not triggered at either extreme of
rotation of the Trigger LEVEL control.
g.
Toggle the Trigger COUPLING switch to
DC.
h. Repeat part
f.
i. Toggle the Trigger SOURCE switch to EXT : 10.
j.
CHECK
- That the display can be triggered at about the
midrange of the Trigger LEVEL control.
k.
Push
the Trigger SLOPE switch to the negative going slope
and
repeat part
j.
1.
Disconnect the test equipment from the instrument.
Step
6.
TV Field Trigger Sensitivity
a.
SET:
Vertical MODE....................
CH
2
VOLTS/DIV
(CH
2). ............ 1 V
SEC/DIV .
..
..... ......... ...... ....... 0.2 ms
Trigger SLOPE.................... Negative Going
Trigger MODE.....................
TV
FIELD
4-
19
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