4.2.2 Advanced Configuration Parameters
The "Advanced Parameters" tab provides access to a variety of more advanced configuration parameters (see
).
Figure 4-4. Advanced Parameters Tab
Set the "Signal Sampling Frequency" to 3.6 MHz for 1-MHz transducers and 8 MHz for 2-MHz transducers.
Other options including 3.4, 3.8, and 4 MHz can also be used for 1-MHz transducers.
The "Delta ToF Offset" is an adjustment to the differential ToF during the calculation of volume flow rate inside
the ultrasonic flow meter library. Developers can optionally make their custom calculation of the volume flow rate
based on the ToF values provided by the library. See the "Calibration User’s Guide".for more details. The "Abs
ToF Additional Delay" is an adjustment to the absolute ToF to account for any additional delays. The value
depends on the shape of the signal and the envelope threshold. Developers can optionally set this value to zero
and make their own adjustments of the absolute ToF in the application layer.
Increase the "Capture Duration" for configurations with a larger number of pulses, or decrease it for
configurations with smaller number of pulses to ensure the signal is fully captured with enough margin for shifts
over the intended operating temperature range.
The "Interpolation Correction Table Size" determines the number of points used to correct for the interpolation
used in the AbsToF algorithm. Designs requiring more accurate results can use a larger interpolation table. For
details on this table, see the "Calibration User’s Guide".
USS GUI
8
Water Flow Meter
SLAU810B – SEPTEMBER 2019 – REVISED SEPTEMBER 2020
Copyright © 2020 Texas Instruments Incorporated