MHz/DIV
DISPERSION RANGE
Type 491
Display of nominal bright-
INTENSITY
2
ness
RESOLUTION
Fully CW
FOCUS & ASTIGMATISM
Adjusted for optimum dis-
IF ATTENUATOR dB
20
play definition
As desired
SCALE ILLUM
IF CENTER FREQ
Midrange (000)
Adjusted for a horizont-
P O S I T I O N (Horizontal
V I D E O FILTER
OFF
ally centered sweep on
and Vertical)
VERTICAL DISPLAY
LIN
the graticule baseline
Midrange
GAIN
TIME/DIV
5 ms
ON
POWER
VARIABLE
CAL
SEARCH
MIXER
PEAKING
TRIGGER
SLOPE
+
FINE RF CENTER FREQ
Centered
FREE RUN
LEVEL
PHASE LOCK Controls
OFF
INT
INT REF FREQ
SOURCE
6-39
