Promax 10 premium Guía De Usuario página 63

USER'S MANUAL. PROMAX-10
LEVEL MEASUREMENT
Measurement
Analogue channels
Digital channels
Measuring range
Maximum input level
From 5 to 863 MHz
DC to 60 Hz
Reduction of the measurement range depending on the number of channels.
Up to 10 channels
From 11 to 20 channels
From 21 to 50 channels
From 51 to 80 channels
Readout
IF bandwidth
Input impedance
Audible indicator
Accuracy
Analogue channels
Digital channels
DIGITAL SIGNALS MEASUREMENT
MER (Modulation error ratio)
Measurement range
Accuracy
BER (Bit error rate)
Measured before RS decoding
Measurement range
Constellation Diagram
Lock range
Symbol rate
Measurement range
2
Because of safety reasons, the maximum input power over the entire band is limited up to 120 dBµV. The
equivalent power level for a group of channels of similar levels is related with the input power level over the entire
band according to the following expression:
L T = L+10 log N (L T : total level , L: mean level of one channel, N: number of channels present).
For higher input power levels, the use of an external attenuator of 20 dB is recommended.
There may be certain frequencies where the symbol "<" appears at levels higher than 25 dBµV (maximum 28 dB).
This is due to the automatic correction of the frequency response.
The value measured remains correct, although the accuracy becomes ±3 dB
3
For the positive video modulation (L standard) it can vary from 0 to -2 dB among white and black image.
4
Including the OP-010-E option, otherwise the margin is from 1000 to 7000.
11/2008
Premium
Video carrier level measurement.
Power measurement in the channel bandwidth by
integration method.
From 25 to 120 dBµV. (From -35 dBmV to
( ) 2
60 dBmV) .
120 dBµV. (60 dBmV
60 V DC or RMS
110 dBµV.
107 dBµV.
103 dBµV.
101 dBµV.
Digital in dBµV, dBmV or dBm and analogue
through a graphic bar. 1 dB resolution.
200 kHz ± 30kHz.
75 Ω.
Tone which varies with the signal level.
± 2 dB (from 0 to 40 °C) for negative video
( ) 3
modulation .
± 3 dB (from 0 to 40 °C) for 8 MHz bandwidth
channels.
22 dB to 34 dB for 64 QAM.
± 2 dB.
10 E-2 to 10 E-8.
DVB-QAM signals (Annex A/B/C) and DOCSIS /
Euro-DOCSIS.
-10 dBmV to 60 dBmV.
1000 to 7200 Msym/s
(2)
).
( ) 4
for 16/64/256 QAM.
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