Fig. 6-4. Equipment setup for adjusting and checking the low and high voltage power supplies.
Type 491
CRT Controls
INTENSITY
CCW
FOCUS Midrange
SCALE ILLUM CCW
ASTIGMATISM
Midrange
INTENSIFIER CCW-OFF
CONTRAST
Midrange
POSITION [Horizontal Midranae
.
and Vertical)
TIME/DIV Controls
TIME/DIV 2 mS
VARIABLE CAL
TRIGGER Controls
SLOPE
+
LEVEL
FREE RUN
SOURCE
INT
DISPERSION Controls
DISPERSION RANGE
MHz/DIV
DISPERSION-COUPLED 2 (Outside Ring)
RESOLUTION
IF ATTENUATOR dB
All switches in off
VIDEO FILTER
VERTICAL DISPLAY
GAIN
POWER
MIXER PEAKING
FINE RF CENTER FREQ
PHASE LOCK Controls
INT REF FREQ
Band Selector
Steps 1 through 6.
OFF
LIN
Midrange
ON
SEARCH
Centered
ON
B
POWER SELECTOR Proper voltage settings for
power source used. See
Operating Instructions.
Test Oscilloscope
Time/Cm
1 ms
Volts/Cm
.005
Input Coupling AC
1. Adjust
- 10 volt supply
o
NOTE
The - 10 volt supply affects the calibration of
most circuits in the Type 491. If the voltage is
within tolerance ( -9.9 to -10.1 volts), this
position
adjustment should not be altered unless a complete
IF CENTER FREQ Controls
Midrange (000)
recalibration is to be performed.
6-8
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