Promax HD Ranger Lite, User Manual

Page: 139 / 184

July 2015
13
2
A1.2
ANALOGUE signals
A1.2.1
Terrestrial band
Analogue TV
In the measurement of analogue signals in terrestrial band, measurements
available are:
►
LEVEL
Indication of the carrier level of the tuned video.
►
C/N
Ratio between the modulated signal power and noise power for the same
bandwidth (depending on TV standard).The modulation error ratio (MER),
used in digital systems is analogue to the Signal-Noise (S/N) ratio in
analogue systems. T Carrier level is measured by a quasi-peak detector
(100 kHz BW).The noise level is measured with an average detector and
corrected to refer it to the bandwidth equivalent to channel noise
(according to its definition for the TV selected standard).
►
Video/Audio
Ratio between levels of the video carrier to audio carrier.
Analogue FM
In the analogue FM measurement mode signal, the display acts as an
analogue indicator of signal representing the signal at the input. The
equipment also demodulates the FM carrier (radio) and can be listened
through the speaker.