Tektronix 2212 Service Manual page 121

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
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