VEGA VEGAPULS series 60 Recurring function test - Manual (Page 12)

Ratio "V" Correction value (dB)
1.1 +0 .8
1.2 +1 .5
1.3 +2 .3
1.4 +3
1.5 +3 .5
1.6 +4
1.7 +4 .6
1.8 +5
1.9 +5 .6
2.0 +6
Example
During setup, the level echo had 32 dB. The distance [m] to the
medium was 12.9 m.
The actual level echo has 25 dB. The distance [m] to the medium is
15.8 m.
Division of the current distance [m] by the distance [m] during setup:
15.8 m : 12.9 m = 1.224
Round mathematically to one position after the decimal point: 1.224 -->
1.2
Correction value for the ratio (1.2): + 1.5
Calculation of the corrected value of the amplitude: 25 dB + 1.5 = 26.5 dB
The result of the example (26.5 dB) is thus within the permissible
tolerance range of - 6 dB (32 dB - 6 dB = 26 dB)
In this example, the test point would be successfully fulfilled.
The following criteria must correspond when comparing the echo data:
l
If there are false echoes in front of the level echo (highest useful
echo probability), they must have a useful echo probability of 0 %.
l
The amplitude [dB] (with correction factor) of the actual level echo
(highest useful echo probability) corresponds to the respective
value of the level echo from the setup (tolerance max. -6 dB). This
means that the actual level echo can be higher, but only max. 6 dB
lower than the level echo during setup.
12 Recurring function test • for VEGAPULS series 60
3 Sequence of the recurring function test
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