NORTEK VECTRINO VELOCIMETER
User Guide
43
Rev. C • 10.2004
Appendix 1
Troubleshooting
Noisy Data
You may experience that the Vectrino works as it should, but that there is a lot of
noise in the velocity.
Noisy data may be caused by:
•
Not enough particles in the water
• The velocity range set too high
• The sampling volume located beyond the bottom (typically if your test bucket
is too small)
• Refl ection and reverberation conditions at the bottom creating pulse-to-pulse
interference between acoustic pulses. Try moving the Vectrino probe up or
down relative to the bot tom
• Probe malfunction. Test the probe (Data collection > Start Probe check).
If the probe really is malfunctioning, report the probe check result to
NORTEK.
My Data Does Not Look Right
The Vectrino cannot measure velocity properly if the water has too few scatter-
ers. Your data will be questionable when signal levels are down around the noise
level (less than 60 counts). For an explanation of the terms counts, see Counts – a
Few Words on the term in the chapter Initial Preparations.
To Next Page
Loading...
