Fig. 6-35. Test equipment setup to check dynamic range, IF GAIN control range, IF ATTENUATOR dB accuracy RECORDER signal out ampli-
tude and incidental FM.
Type 491
LEVEL
FREE
RUN
SOURCE
INT
INTENSITY
Display of nominal
DISPERSION RANGE
kHz/DIV
brightness
DISPERSION-COUPLED
500 kHz/div
FOCUS
and
ASTIGMATISM
Adjusted for optimum
RESOLUTION
display definition
IF ATTENUATOR dB
All switches in off position
INTENSIFIER
OFF
I F CENTER FREQ
Midrange (000)
SCALE ILLUM
As desired
V I D E O FILTER
OFF
POSITION
(Horizontal
and
Adjusted for a horizon
VERTICAL DISPLAY
LIN
Vertical)
tally centered sweep
GAIN
Midrange
on the graticule
POWER
baseline.
ON
TIME/DIV
10 ms
MIXER
PEAKING
SEARCH
FINE RF CENTER FREQ
VARIABLE
CAL
Centered
TRIGGER
PHASE
LOCK
Controls
OFF
SLOPE
INT REF FREQ
+
