Promax 8 SE Mode D'emploi page 57

USER'S MANUAL. PROMAX-8
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 POWER SIGNALS MEASUREMENT
Bandwidth
Frequency tuner
VIDEO / AUDIO RATIO MEASUREMENT (ANALOGUE CHANNELS)
Measurement
Measurement range
Audio subcarrier frequency
Variable
Accuracy
CARRIER / NOISE RATIO MEASUREMENT
Measurement
Analogue channels
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
For the AM audio carrier (L standard), it can vary from 0 to -3 dB below the V/A value.
07/2011
SE
From 25 to 120 dBµV (from —35 dBmV to
(2)
60 dBmV ) (for a bandwidth of 200 kHz).
From 35 to 120 dBµV (from —25 dBmV to
60 dBmV) (for digital channels of 8 MHz).
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 ± 30 kHz
75 Ω
Tone which varies with the signal level.
± 2 dB (from 5 to 40 °C) for negative video
(3)
modulation .
± 3 dB (from 5 to 40 °C) for 8 MHz bandwidth
channels.
0.3 — 9.9 MHz (switchable).
10 kHz
Ratio of video to audio carrier levels.
From 0 to 40 dB.
4-9 MHz
± 2 dB (from 0 to 40 °C) for FM audio carrier
Ratio between carrier level and the channel's noise
level.
(2)
)
(4)
.
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