Promax PROLINK-4C, Manual

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USER’S MANUAL. PROLINK-4C
Page 32 02/2003
Similar effects can be observed when at the RF input appears an important number of
carriers with a high level. 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:
Lt=L + 10 log N
Lt: 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:
90 dBµV + 10 log 10 = 100 dBµV
Observe that in this case, loss of tuning by overload of the RF input may occur besides
other effects such as tuner saturation and generation of intermodulation products that
may mask the spectrum visualization.
4.9.1.1.1 On-screen Measurement Information
In TV operation mode, the measurement information to be displayed on-screen
is selected by pressing key [2]. Three possibilities are offered, selected cyclically:
-
TV image with a window in the lower part of the screen displaying the signal
level and frequency/channel.
- TV image with a window displaying information on the name assigned to
memory, power supply to external units, sound, colour system, TV
standard, level and frequency/channel.
-
TV image only.
In digital channels, pressing [2] shows the corresponding TV image for
the tuned digital signal. You will need to have previously correctly configured the tuning
process for the digital signal. (See ‘4.9.1.5 BER Measurement Mode Selection’.) The
time employed in decoding very much depends on the structure and quantity of tables
within the TS and the condition of your instrument, but is generally less than a minute. It
is also possible to select the reading information you want to appear on the monitor.
Three choices are offered, and may be selected cyclically:
-
TV image, with a window appearing at the bottom showing the readings
associated with the signal and the information given by the tuned digital
service (Network, Provider, Bouquet).
-
TV image only.
-
Screen showing the digital parameters read by the instrument.