Aalborg Vortex - Manual (Page 49)

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FFT Noise Threshold is configured to reject noise within the flow range while
allowing normal amplitude variation of the vortex signal. Signals of amplitude
lower than the Trigger Level setting are filtered out. The factory setting optimizes
noise rejection in most applications.
Attenuator Target Level defines the target RMS level for the sensor signals. If
Auto Attenuation is enabled the DSP algorithm will constantly adjust attenuation
to keep sensors RMS output within Attenuator Target Level value. Default factory
setting value (200) works for most applications.
Manual Attenuation Adjustment allows you to manually adjust the sensors RMS
output individually for each sensor. This feature mostly useful only for trou-
bleshooting procedure.
Sensor Auto Balancing procedure designed to automatically balance sensors
RMS output.
5.3.7.3 Submenu Meter Size
The Meter Size or pipe I/D (for insertion type) is preset at the factory and should
not be changed unless meter body or PCB electronics are replaced or meter is
being installed in to the pipe with different internal diameter for insertion flow
meter.
5.3.7.4 Submenu Meter Full Scale Range
The Meter Full Scale Range in Litr/min is preset at the factory and should not be
changed unless meter body or PCB electronics are replaced or meter is reconfig-
ured for different application.
NOTE: Manual Attenuation Adjustment will work properly only when
Auto Attenuation is disabled.
NOTE: Your Vortex Flow Meter sensors were adjusted at the factory for
the best balance. There is no need to perform Auto Balancing
procedure, unless new sensors are installed or PCB electronics is
replaced. Any alteration of the flow meter sensor balancing settings
will VOID calibration warranty supplied with instrument.
Do not adjust FFT DSP parameter unless directed to do so by an
AALBORG Technical Support Representative.
NOTE: Do not adjust Meter Full Scale Range parameter unless directed
to do so by an AALBORG Technical Support Representative.