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Maintenance
and
Calibration—Type
3B4
29.
Check Horizontal Position Range
Procedure:
Turn the MAGNIFIER
knob to the 5 EXT VOLTS
position.
Increase the square wave input to 20 volts.
Using the POSI-
TION
control, it should be possible to position the display
off the crt fact at either end.
Turn the FINE control fully clockwise.
With the POSITION
control,
position
the
right hand
end
of the display on a
major
graticule
line.
Now
rotate
the
FINE
control
fully
counterclockwise;
the display
should
shift frem
0.9 to 1.4
major division.
30.
Check External Horizontal Bandpass
Set:
3B4 Controls
Setting
TIME/DIV
EXT HORIZ
IN
VARIABLE
CALIB
MAGNIFIER
.2 EXT VOLTS
4-10
Type 190B Controls
Setting
RANGE
SELECTOR
50 KC
Procedure:
Connect
the Type
190B Attenuator to the Type 3B4 EXT
HORIZ
IN connector.
Adjust the Type 190B ATTENUATOR
and OUTPUT
AMPLITUDE
controls for a horizontal deflec-
tion of 8 major divisions.
Change the Type 190B RANGE SELECTOR switch to .35 to
75 MEGACYCLES.
Turn the Type 190B RANGE
IN MEGACYCLES
control un-
til the crt display shrinks to 5.6 major divisions (30% down
points).
Check that the Type 190B RANGE
IN MEGACYCLES
dial reads .40 megacycles or above,
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