NORTEK VECTRINO VELOCIMETER
User Guide
31
Rev. C • 10.2004
The Confi guration Settings
Sampling Rate
Sampling rate sets the output rate for the velocity, amplitude, correlation, and
pressure data. This rate also determines the rate at which data are recorded in-
ternally or to disk.
The available sampling rate intervals are:
•
Vectr ino: 1–25 Hz
• Vect rino : 1–200 Hz
Nominal Velocity Range
Velocity range should be set to cover the range of the velocities anticipated dur-
ing the data collection. A higher velocity range give more noise in the data and
vice versa. The true velocity range can be found in the performance pane. You
may have to make a trial measurement to fi nd the best setting to use.
The available nominal velocity range settings are:
•
Vectrino: ±0.01, ±0.1, ±0.3, ±1, ±2, ±4 [m/s]
• Vect rino : ±0.01, ±0.1, ±0.3, ±1, ±2, ±4 [m/s]
Sampling Volume Height Setting
The sampling volume is cylindric with a fi xed diameter of 6 mm. The height is
user adjustable. When reducing the sampling volume size, the total number of
samples that are being used for the velocity calculation is reduced. The effect of
this reduction is that the precision of the measured velocity is reduced.
The available height settings are:
•
Vectr ino: 3–15 mm
• Vect rino : 3–15 mm
Transmit Length
The effect of increasing the transmit pulse length is that the signal-to-noise ra-
tio is increased. You may reduce the transmit pulse as a means of reducing the
sampling volume and/or get closer to boundaries. Note that when changing the
transmit length the available sampling volumes sizes are also changed.
The available height settings are:
•
Vectrino: 0.3, 0.6, 1.2, 1.8, 2.4 [mm]
• Vect rino : 0.3, 0.6, 1.2, 1.8, 2.4 [mm]
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