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TRILITHIC
Model One Operating Manual
– 51
Carrier-To-Noise
Measurement
To enter the C/N screen, press
C/N
.
The meter displays the C/N RATIO screen.
The meter measures the C/N difference of
the selected channel. First, it measures
the video carrier level of the selected
channel.
NOTE:
The video carrier level MUST
be greater than 25dBmV (85dB
µ
V).
If the measured video carrier is greater
than 25dBmV (85dB
µ
V), the meter will
display a “please wait...” message prompt.
Then, the meter measures the noise level
in the guard band of that channel and
calculates the measurement of the
affected channel. The value of the C/N
difference is displayed on the screen.
Tilt and Favorite Channel
When installing and maintaining your
CATV system, you may want to concen-
trate on only a few channels’ levels and
the gain distribution of the transmission
line.
Basic Operation
19:16:30
C/N
AUTO SELECT
OFFSET FREQUENCY
CH 17
VIDEO
1.2
dBmV
139.25M
C/N
THE CARRIER
LEVEL MUST
BE GREATER
THAN 25dBmV