Cidra Use of Foundation Fieldbus Protocol with SONARtrac Manual de usuario descargar pdf (Pagina 22)

Table 3 Transducer Block Configurations (Page 9)

FLOW_WINDOW_OVERLAP

Unsigned

Long

R/W

Define overlap of FFT windows. This value is normally

set by DSP to half of NFFT.

FLOW_WINDOW_AVERAGES

Unsigned

Long

R/W

Default values are normally OK. In general* for slower

flow rates* use more FFT averages* for faster flow

rates* use fewer FFT averages. This parameter affects

the number of blocks used (there is a 20 block

maximum due to DSP memory limitations). Use with

caution.

FLOW_CALIBRATION

FLOW_CAL_COEFF_C0 Float R/W

Volumetric flow calibration coefficient C0.

FLOW_CAL_COEFF_C1 Float R/W

Volumetric flow calibration coefficient C1.

FLOW_CAL_COEFF_C2 Float R/W

Volumetric flow calibration coefficient C2.

SOS_ALGORITHM

SOS_SAMPLE_FREQ Float R/W

Set sample frequency for SOS mode. This parameter

must be set for SOS* and overrides the

SAMPLE_FREQ setting if running in SOS mode.

Enter one of the following: 3906.25* 2055.921.

SOS_FREQ_MIN Float R/W

Minimum frequency to use for SOS calculation.

Typically in the 100 to 500hz range. Depends upon the

data quality as seen on the k-w plot. SOS_FREQ_MIN

and SOS_FREQ_MAX set the frequency range over

which the SOS calculation will be performed. The larger

this range* the longer the calculations will take.

SOS_FREQ_MAX Float R/W

Maximum frequency to use for SOS calculation.

Typically in the 800 to 1500hz range. Depends upon

the data quality as seen on the k-w plot.

SOS_FREQ_MIN and SOS_FREQ_MAX set the

frequency range over which the SOS calculation will be

performed. The larger this range* the longer the

calculations will take.

20958-01 Rev 02

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