Tektronix 491 - Page 127

Fig. 6-40. Equipment setup to check internal spurious responses.
Type 491
DISPERSION RANGE
INTENSITY
Display of nominal bright-
DISPERSION
ness
FOCUS & ASTIGMATISM Adjusted for optimum dis-
play definition
RESOLUTION
IF ATTENUATOR dB
SCALE ILLUM
As desired
IF CENTER FREQ
POSITION (Horizontal
Adjusted for a horizont-
VIDEO FILTER
and Vertical)
ally centered sweep on
the graticule baseline
VERTICAL DISPLAY
TIME/DIV 5 ms
GAIN
VARIABLE
CAL
POWER
TRIGGER
MIXER PEAKING
SLOPE
+
FINE RF CENTER FREQ
LEVEL
FREE RUN
PHASE LOCK Controls
SOURCE
INT INT REF FREQ
MHz/DIV
2
Fully CW
20
Midrange (000)
OFF
LIN
Midrange
ON
SEARCH
Centered
OFF
6-39