VEGA VEGASON 54P…56P Profibus PA - Manual (Page 43)

VEGASON 54P … 56P 43
Setup
Ampl.:
XX dB
S-N:
XX dB
8. Signal and noise level
In the menu
you get important information on the signal
quality of the product echo. The higher the
"S-N" value, the more reliable the measure-
ment (menu schematic MINICOM).
Ampl.: means amplitude of the level echo in
dB (useful level)
S-N: means Signal-Noise, i.e. the useful
level minus the level of the back-
ground noise
The bigger the "S-N" value (difference be-
tween the amplitudes of the useful signal level
and the noise level), the better the measure-
ment:
> 50 dB
Measurement excellent
40 … 50 dB Measurement very good
20 … 40 dB Measurement good
10 … 20 dB Measurement satisfactory
5 … 10 dB Measurement sufficient
< 5 dB Measurement poor
Example:
Ampl. = 68 dB
S-N = 53 dB
68 dB – 53 dB = 15 dB noise level
A signal distance of 53 dB means a very high
degree of measurement reliability.
9. Outputs
Under the menu "Outputs" you determine, for
example, if the current output should be
inverted, or which unit of measurement
should be shown on the sensor display.