Deviser DS2002 Operation Manual page 17

The up left is the channel number, the down left is the
video carrier frequency, the up right is the video carrier
level and the C/N value of this channel is shown on the
down right.
You can change the channel number by pressing
or .

1. In this mode, the initial channel number is
the same with SINGLE CHANNEL TEST
mode.
2. Using this meter you can made both online
test and carrier-off test, when entering the
C/N test mode, it will automatically enter
ONLINE TEST mode first and display the
C/N value, if shutting off the carrier at this
time, it will automatically enter the
carrier-off test mode and display the more
exact C/N value.
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