Promax US TV EXPLORER II Manual De Uso página 56

10
FREQ:
CH:
Figure 24.- Analogue signal level measurement in terrestrial band.
Turn the rotary selector
[12] key to select the type of measurement to visualize on the monitor.
The available types of measurements are:
LEVEL:
C/N:
V/A:
FM Deviation:
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
So, if there are ten carriers with a level around 90 dBμV, their equivalent level will be:
Page 48
30 50 70
168.25 MHz
S10
[1] to change the tuning channel/frequency. Press the
Level indication on the upper part of the screen (analogue
bar).
Carrier / Noise ratio measurement.
Video / Audio ratio measurement.
Measure the frequency peak deviation for any modulated
analogue carrier in FM.
USER'S MANUAL. US TV EXPLORER
90 110
» LEVEL: 78.2 dBµV
C/N 40.1 dB
V/A: 16.2 dB
FM DEV: - - - kHz
130
WARNING
11/2013
II