Head
59
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GA10218_0101 - 5/2002
6.4.7.1 Pinpoint
The tone of the acustical signal changes its frequency only in a Leakrate-
window Fig. 21 which ranges from one decade below the Trigger level 1
up to one decade above the Trigger level 1. Below the window the tone is
constantly low, above the window it is constantly high.
Example: The Trigger level 1 is 4·10
-7
mbar l/s. So the window where the
tone changes reaches from 4·10
-8
mbar l/s up to 4·10
-6
mbar l/s.
6.4.7.2 Leak rate prop.
The frequency of the accoustic output is proportional to the reading on
the bargraph display. The frequency ranges from 300 Hz to 3300 Hz.
Please refer to Chapter 6.2.1 Scale linear/logarithmic for the definition of
the number of decades.
6.4.7.3 Setpoint
The tone is off as long as the leak rate is below the Trigger level 1. Above
Trigger 1 the tone varies proportional to the leak rate Fig. 22.
6.4.7.4 Trigger alarm
As soon as the leak rate increases above trigger level 1, a multi-tone
signal is generated. The tone does not vary with the leak rate.
Fig. 21 Pinpoint: Change of the frequency in the leak rate window
(TR1=Triggerlevel 1)
Fig. 22 Setpoint: Change of the frequency above the triggerlevel 1 (TR1=
Triggerlevel 1)
f
LRTr. 10.1 • Tr. 1 10 • TR. 1
2570 Hz -
491 Hz -
f
LRTr. 1
no tone
375 Hz -
1000 • TR.1
3000 Hz -
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