Promax TVHUNTER, Руководство пользователя

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USER’S MANUAL. TVHUNTER .
10/2010 Page 21
The instrument can store up to fifty points of detection. Each test point is defined
with a name up to 8 letters, which appears on the display when is selected. The number
of active test points can be also selected.
ATTENTION
The signal provider is the exclusive responsible in the accuracy position. PROMAX
ELECTRONICA, S.A. only extracts and shows the information contained in the
detected signal.
4.3.3 Antenna Adjustment for Optimum Signal Quality (3> ADJUST)
Once the antenna has been positioned in order to receive the maximum power
and you have identified the multiplex, it should be adjusted to achieve the maximum
MER level, and therefore the best quality at reception.
Through the function ADJUST you should check every access point of the
telecommunication facility, according to the characteristics and rules of your area.
Check what rules or decrees are applied on your country or area.
1.- To select the function 3> ADJUST you must press the key [3]. When a
signal with a valid transport stream is detected, the TVHUNTER shows the
network at the top line and the sign at the right corner.
2.- This function measures the MER , which is the ratio between the DVB-T
average power and the noise average in a constellation. Next to this measure
there is the
NM (Noise Margin), which is the safety margin that exceeds the
minimum acceptable quality of MER . It also measures the error rate in a DVB-
T signal, before the Viterbi correction process ( CBER ) and after it ( VBER ).
3.- Measurements are shown on the screen in a graphical and alphanumerical
way (see figure 14). The unit of measure of the power average is configurable
by software. It can be selected among dB
µ
V, dBmV ó dBm.