Campbell Scientific AVW200 AVW200-series Vibrating Wire Interfaces - Page 47

Frequency in Hertz, DevConfig

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AVW200-series 2-Channel Vibrating Wire Spectrum Analyzer Modules NOTE being measured using a multiplexer. The first dimension is set equal to the number of sensors being measured and the second dimension is set equal to the number of values returned for each sensor (5 or 6). For example, to measure 4 sensors with thermistor measurements attached to a multiplexer, Dest would be declared as Array(4,6). Values for sensor 1 would be stored in Array(1,1) through Array(1,6), values for sensor 2 stored in Array (2,1) through (2,6), etc. The values returned for each sensor are: (1) Frequency in Hertz (2) Amplitude in mV RMS (3) Signal-to-noise ratio (4) Noise frequency (5) Decay ratio (6) Thermistor in ohms (if measured) The units and description of these values are provided in TABLE 2-2. If communication is unsuccessful, NANs are stored. When using the CRBasic AVW200 instruction, the signal strength Amplitude in mV rms ( Dest(2) ) has a minimum resolution of 0.0625 (62.5 microvolts). This means that values between 0.01 and 0.06249 mV (10 and 62.49 microvolts) will be given as 0. Values between 0.0625 and 0.1249 will be given as 0.0625. Values between 0.125 and 0.18749 will be given as 0.125, and so forth. With firmware Std.04 and higher, values less than 0.01 will be shown as NAN, otherwise as 0. AVWChan MuxChan Reps To see amplitudes with higher resolution, use SDI-12 (Section 3.3.1, SDI-12 Communication), Terminal mode (Section 5.7, Terminal), or the "Troubleshoot" tab in DevConfig (Section 5.5, Troubleshoot) to examine signal strength amplitude values. The AVWChan is the channel on the AVW200 where the sensor or multiplexer is wired. Valid options are 1 (1V+/-) or 2 (2V+/-). The MuxChan is the channel on the multiplexer where measurements should start. Valid options are 1 through 32; anything outside of this range returns an error. Enter 1 if a multiplexer is not used. The Reps parameter is the number of measurements to be made on the multiplexer. This parameter does not affect the AVW200Chan. 39

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AVW200-series 2-Channel Vibrating Wire Spectrum Analyzer Modules
being measured using a multiplexer. The first dimension is
set equal to the number of sensors being measured and the
second dimension is set equal to the number of values
returned for each sensor (5 or 6).
For example, to measure 4
sensors with thermistor measurements attached to a
multiplexer, Dest would be declared as Array(4,6). Values
for sensor 1 would be stored in Array(1,1) through
Array(1,6), values for sensor 2 stored in Array (2,1) through
(2,6), etc.
The values returned for each sensor are:
(1)
Frequency in Hertz
(2)
Amplitude in mV RMS
(3)
Signal-to-noise ratio
(4)
Noise frequency
(5)
Decay ratio
(6)
Thermistor in ohms (if measured)
The units and description of these values are provided in
TABLE 2-2.
If communication is unsuccessful, NANs are stored.
When using the CRBasic AVW200 instruction, the signal strength
Amplitude in mV rms ( Dest(2) ) has a minimum resolution of
0.0625 (62.5 microvolts).
This means that values between 0.01
and 0.06249 mV (10 and 62.49 microvolts) will be given as 0.
Values between 0.0625 and 0.1249 will be given as 0.0625.
Values between 0.125 and 0.18749 will be given as 0.125, and so
forth.
With firmware Std.04 and higher, values less than 0.01 will
be shown as NAN, otherwise as 0.
To see amplitudes with higher resolution, use SDI-12
(Section 3.3.1,
SDI-12 Communication
), Terminal mode
(Section 5.7,
Terminal
), or the "Troubleshoot" tab in
DevConfig (Section 5.5,
Troubleshoot
) to examine signal
strength amplitude values.
AVWChan
The AVWChan is the channel on the AVW200 where the
sensor or multiplexer is wired. Valid options are 1 (1V+/-) or
2 (2V+/-).
MuxChan
The MuxChan is the channel on the multiplexer where
measurements should start. Valid options are 1 through 32;
anything outside of this range returns an error.
Enter 1 if a
multiplexer is not used.
Reps
The Reps parameter is the number of measurements to be
made on the multiplexer. This parameter does not affect the
AVW200Chan.
NOTE
39