4.2.4.2.3 M easurement of the C /N ratio with adjacent channels present
To perform this measurement, proceed as follows:
1) Select the digital channel measurement mode.
2) Tune the main carrier of the channel and wait a few moments until the reading
level stabilises.
3) Select the frequency shift of the noise level measurement by means of the F 3
function to a frequency where the modulation content is minimum (about
4 M H z
).
4) Press the C /N [14] key.
5) Wait until the reading stabilises (10 seconds maximum).
E xample 12.
Measurement of the C/N ratio for channel D25 (with adjacent channel).
Channel power level =
74 dBµ V (14 dBmV)
