Promax US TV EXPLORER 2 User Manual página 57

USER'S MANUAL. US TV EXPLORER II
10
FREQ:
CH:
Figure 23.- Analogue signal level measurement in terrestrial band.
Turn the rotary selector [1] to change the tuning channel/frequency. Press the
[12] key to select the type of measurement to visualise on the monitor.
The available types of measurements are:
LEVEL: Level indication on the upper part of the screen (analogue
bar).
C/N: Carrier / Noise ratio measurement.
V/A: Video / Audio ratio measurement.
FM Deviation: Measure the frequency peak deviation for any modulated
analogue carrier in FM.
When at the RF input appear an important number of carriers with a high level the
tuning circuit may become out of control, giving as a result wrong level measurements.
To be able to determinate the equivalent level of a carrier group (with similar levels) at
the RF input, it is possible to use the expression:
L t =L + 10 log N
L t : equivalent total level
L: average level of the carriers group
N: number of carriers
10/2007
30 50 70 90 110
168.25 MHz » LEVEL:
S10 C/N
V/A:
FM DEV:
130
78.2 dBµV
40.1 dB
16.2 dB
- - - kHz
WARNING
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