Tektronix 1L30 Instruction Manual page 77

Calibration— Type 1L30
Monitor
Type 1L30
POS
IF CENTER FREQ
FINE
DISPERSION RANGE
DISPERSION-COUPLED
RESOLUTION
VIDEO FILTER
GAIN
VERTICAL DISPLAY
IF ATTEN
FINE RF CENTER FREQ
INT 1 M Hz REF FREQ
Plug-In Oscilloscope
Time/Cm
Triggering
Horizontal Position
Test Oscilloscope
Time/Cm
Triggering
6-20
Fig. 6-22. Equipment setup to check video bandpass (step 1 4 ).
Position a free running
trace to the bottom line
of
the graticule
Midrange (000)
Centered
M H z/C M
10 MHz
OFF
Fully clockwise
VIDEO
Switches off
Centered
OFF
50 ms
Adjust for a free
running sweep
Centered trace
50 ms
Adjust for a free running
sweep
14. Check Frequency Response of Video Circuit
a. Equipment setup is shown in Fig. 6-22.
b. Apply a 50 kHz signal from the Audio Signal Generator
through a BNC T connector to both the Type 1L30 Video
INPUT connector and the vertical Input of a DC coupled
test oscilloscope.
c. Turn the Type 1L30 G A IN control fully clockwise. A d­
just the signal generator output control for a signal am pli­
tude of 4 cm on the plug-in oscilloscope, then adjust the test
oscilloscope sensitivity for a 4 cm display reference amplitude.
d.
Decrease the signal generator frequency until the sig­
nal amplitude on the plug-in oscilloscope decreases to 2.8
cm. Maintain a constant 4 cm reference amplitude on the
monitor oscilloscope.
e. Check— Input frequency
should be equal to or less than 16 Hz.
f. Remove the Audio Signal Generator and apply 50 kHz
signal from the Constant Amplitude Signal Generator (Type
191) through the BNC T connector to the Video INPUT.
g. Adjust the output of the Constant Amplitude Signal
Generator for a signal amplitude of 4 cm on both oscillo­
scopes.
from the signal generator