Product: 492/492P Service Vol. 1
Date: 5-2-84 Change Reference: C101/584
DESCRIPTION
7L14 Center frequency 0110
Freq span/div 1 MHz
Hz Resolution 3 MHZ
Reference level 0 dBm
Reference level mode 2 dB/Div
Digital storage off
Time/Div manual
Triggering
Source free run
Mode norm
Video filter on
DC503A
Function
T iming
Channel A
Attn
Coup 1
Sourc e
Frequency A
10 ms
XI
dc
ext/50 ohm
Adjust level for a stable display (approx. 110.00 MHz)
492/492P Option 42
REFERENCE LEVEL
CENTER FREQUENCY
FREQUENCY SPAN/DIV
Hz RESOLUTION
VERTICAL DISPLAY
MIN RF ATTEN
-30 dBm
110 MHz
1 MHz
1 MHz
2 dB/DIV
0 dB
c. Bet the 7L14 Time/Div to Mnl and adjust the dot to center screen with
the Manual Scan control.
d. Adjust the 7L14 Center Frequency control for an indication of 110.0 on
the Frequency Counter.
e. While keeping the signal centered with the CENTER FREQUENCY control,
set the 492 Option 42 FREQUENCY SPAN/DIV control to 0 (the Frequency Span/Div
on the crt will indicate 10 ms).
f. Bet the 7L14 Time/Div for a calibrated display and adjust the Reference
Level and TR502 Var dB for full screen signal.
g. Switch the TR502 Dot Intensity to "on", and adjust the 7L14 Center
Frequency for an indication of 110.0 on the Frequency Counter.
h. Check the bandwidth at a point 3 dB (1.5 divisions) from the peak of'
the signal to be 5 MHz.
i. Check that any ripple present on the waveform is </= 0.5 dB (</= 0.25
divisi ons).
j. Check that the waveform symmetry is +/- 1.0 MHz (+/- 1.0 division) b"
assuring that the 3dB and 6dB points on the waveform are equidistant fro*
center screen. (The peak of the signal may not be at center of the screen;.^
This concludes the Performance Check part of the Calibration .Procedure.
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