Type 491
Midrange
GAIN
POWER
ON
Display of nominal
INTENSITY
SEARCH
MIXER
PEAKING
brightness
FINE RF CENTER FREQ
Centered
Adjusted for optimum
FOCUS
and
ASTIGMATISM
PHASE LOCK Controls
display definition.
INT REF FREQ
OFF
OFF
INTENSIFIER
Test Oscilloscope
As desired
SCALE ILLUM
Time/Cm
1 ms
Adjusted for a
POSITION
(Horizontal
and
Volts/Cm
.05
horizontally centered
Vertical)
sweep on the graticule
Input Coupling
AC
baseline.
Trigger
LINE
2 ms
TIME/DIV
o
CAL
23. Adjust IF Amplifier Response and
VARIABLE
TRIGGER
Resolution Bandwidth
+
SLOPE
a. Equipment setup is shown in Fig. 6-23.
Triggered
sweep
LEVEL
LINE
SOURCE
NOTE
kHz/DIV
DISPERSION
RANGE
Resolution bandwidth should be pre-adjusted be-
fore calibrating the kHz/div dispersion. Repeat
Set the DISPERSION to
DISPERSION-COUPLED
this step after adjusting kHz/div dispersion if
50, uncouple the RES-
RESOLUTION
kHz/div dispersion error is greater than 6%.
OLUTION control and
t u r n fully clockwise.
b. Apply 200 MHz signal (2nd harmonic of 10 ns) from the
All switches in off position
IF ATTENUATOR dB
Time-Mork Generator (Type 184) through a 20 dB attenuator
ond proper adapter to the RF INPUT connector.
Midrange (000)
IF CENTER FREQ Controls
OFF
V I D E O FILTER
Two alternate methods of 200 MHz signal application are
LIN
as follows:
VERTICAL DISPLAY
