Fig. 6-14. Equipment setup to check and adjust sweep circuits, Steps 12 through 20.
Type 491
INTENSITY
FOCUS and ASTIGMATISM
INTENSIFIER
SCALE ILLUM
POSITION (Horizontal and
Vertical)
TIME/DIV
VARIABLE
TRIGGER
SLOPE
LEVEL
SOURCE
DISPERSION RANGE
DISPERSION-COUPLED
RESOLUTION
DISPERSION BAL
IF ATTENUATOR dB
IF CENTER FREQ
VIDEO FILTER
VERTICAL DISPLAY
GAIN
POWER
Display of nominal
brightness
Adjusted for optimum
display definition
OFF
As desired
Adjusted for a
horizontally centered
sweep on the graticule
baseline
2 ms
CAL
+
FREE RUN
INT
MHz/DIV
5 MHz/div
Centered
All switches in off
position
Midrange (000)
OFF
LIN
Midrange
ON
MIXER PEAKING
FINE RF CENTER FREQ
PHASE LOCK Controls
INT REF FREQ
Test
Time/Cm
Volts/Cm
Input Coupling
Trigger
SEARCH
Centered
OFF
Oscilloscope
1
ms
2
DC
lnt.-Triggered display
12. Adjust Sweep Length
o
a. Equiment setup is given in Fig. 6-14,
b. Connect the probe from the test oscilloscope to pin S
of the Horizontal Amplifier circuit board.
c. Adjust the Sweep Length R759 (see Fig. 6-15) for a 7.5 V
peak to peak sawtooth waveform on the test oscilloscope
13. Adjust Sweep Calibration and Sweep o
Gain
a. Equipment setup is given in step 12.
b. Apply 0.1 ms markers from the Time-Marker Generator
to pin H of the Vertical Amplifier circuit board. Set the Type
491 TIME/DIV selector
a triggered display.
to .1 ms. Adjust the LEVEL control for
6-17
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