Steps 1 through 6.
V I D E O FILTER
Type 491
OFF
VERTICAL DISPLAY
LIN
CRT Controls
GAIN
Midrange
INTENSITY
CCW
POWER
FOCUS
Midrange
ON
M I X E R PEAKING
SCALE ILLUM
CCW
SEARCH
FINE RF CENTER FREQ
Midrange
ASTIGMATISM
Centered
PHASE LOCK Controls
INTENSIFIER
CCW-OFF
I N T REF FREQ
ON
Midrange
CONTRAST
Band Selector
B
.
P O S I T I O N [Horizontal
Midranae
and Vertical)
POWER
SELECTOR
Proper voltage settings for
power source used. See
TIME/DIV
Controls
Operating Instructions.
TIME/DIV
2 mS
Test Oscilloscope
VARIABLE
CAL
1 ms
Time/Cm
TRIGGER
Controls
.005
Volts/Cm
SLOPE
+
Input Coupling
AC
FREE RUN
LEVEL
INT
SOURCE
o
1. Adjust - 1 0 v o l t s u p p l y
Controls
NOTE
MHz/DIV
DISPERSION
RANGE
DISPERSION-COUPLED
2 (Outside Ring)
The - 10 volt supply affects the calibration of
RESOLUTION
most circuits in the Type 491. If the voltage is
All switches in off
IF ATTENUATOR dB
within tolerance ( -9.9 to -10.1 volts), this
position
adjustment should not be altered unless a complete
recalibration is to be performed.
Midrange (000)
IF CENTER FREQ Controls
