
Calibration— Type 1A1
Fig. 7 -3 4 . T«»t equipment tefup for tto p i 24 and 23.
Control Settings
Type 547 Oscilloscope
INPUT SELECTOR
(both channels)
DC
Horizontal Display
B
Type 191 Constant Amplitude Signal Generator
Sweep Magnifier
XI Off
Frequency dial
45 MHz
Single Sweep Switch
Normal
Frequency Range
50 kHz Only
Triggering Level
Fully CW and pushed in
Amplitude
20
Triggering Source
Norm Int
Variable
Cal
Triggering Coupling
AC
Amplitude Range
50-500 mV
Triggering Slope
Power
On
Triggering Mode
Auto Stability
Time/Cm
Variable |Timc/Cm)
.05 ms
Calibrated
24. Check Upper Bandwidth Limit (Both
r k n n n a lc l
Horizontal Position
Trace positioned to start
at left graticule line
a. Test equipment setup. with connections made at com
Amplitude Calibrator
Off
pletion of step 24c, is shown in Fig. 7-34.
Type 1A1
MODE
POSITION
(both channel)
PULL FOR INVERT
[both channels)
VARIABLE VOLTS/CM
(both channels)
VOLTS/CM
(both channels)
CH 1
Midrange
Normal or in
CALIB
.05
b. Check that the controls are set as given in the list that
precedes step 24.
c. Apply the 50-kHz reference signal from the Type 191
Output connector through a 5-ns cable and a 50-ohm in line
termination to the Type 1A1 Channel 1 INPUT connector
|sec Fig. 7-34|.
d. Adjust the Type 191 Amplitude controls so the dis
play is exactly 4 cm in amplitude. This is the reference am
plitude |see Fig. 7-35A).
e. Set the Type 191 Frequency Range switch to 42-100.
7-29
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