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