Tektronix 1L30 Instruction Manual page 86

Fig. 6-29. Equipment setup to check internal spurious signal re^
sponse 19).
(siep
Type 1L30
POS
IF CENTER FREQ
FINE
DISPERSION RANGE
DISPERSION
©
Position of a free running
trace to the bottom line
of the graticule
Midrange (000)
Centered
kH z/C M
500 kHz
NOTES
RESOLUTION
VIDEO FILTER
VERTICAL DISPLAY
IF ATTEN
FINE RF CENTER FREQ
INT 1 M H z REF FREQ
Oscilloscope
Time/Cm
Triggering
Horizontal Position
19. Check Amplitude of Spurious Signals from
Internal Sources
a. Equipment setup is shown in Fig; 6-29.
b. Install the Type 1L30 into the plug-in oscilloscope verti­
cal compartment. Connect a 50 0
INPUT connector. Set the DISPERSION RANGE selector to
kH z/C M , the DISPERSION to 500 kHz/cm,
RESOLUTION control and turn fully clockwise.
c. Adjust the G A IN control for approximately 1 centi­
meter of noise level. Adjust the MIXER PEAKING control
for maximum signal amplitude, then check across the fre­
quency band for internal spurious signals.
the spurious responses should not exceed 2 X
level. The MIXER PEAKING must be adjusted for optimum
sensitivity when the RF Center Frequency has been changed
more than 100 MHz.
If spurious signals appear at the low end of the frequency
band, they can usually be minimized by proper dress of the
oscillator filament leads.
C a lib ra tio n — Type H 3 0
Fully clockwise
OFF
LIN
Switches off
Centered
OFF
20 ms
Adjusted for a free
running sweep
Centered trace
termination on the RF
uncouple the
Amplitude of
the noise
I
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