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Greatly Reduces Signal Noise
Spectral analysis plus high resolution result in better readings
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Technical Description

The AVW200 uses an innovative spectral-interpolation method for measuring the sensor’s resonant frequency. With the spectral interpolation method, the module excites the vibrating wire sensor, measures the response, performs a Fourier transform on the response, and returns the result with a resolution better than 0.001 Hz—all within two seconds. Because spectral analysis can distinguish signal from noise on the basis of frequency content, this method offers improved immunity to competing noise.

The AVW200 module also provides many self-checking diagnostics such as vibrating element signal strength, signal-to-noise ratio, vibrating-element signal decay ratio, and incorrect signal response. These diagnostics can be running in the background to give continual feedback of the condition for each sensor.

AVW200 Specifications

  • Number of Vibrating Wire Sensors Measured: Up to 2 vibrating wire sensors can be connected to the interface.
    Additional sensors can be measured by using an AM16/32-series multiplexer.
  • Power Requirements: 9.6 to 16 Vdc
  • Typical Current Drain @ 12 Vdc:
    ~0.3 mA (quiescent);
    ~6 mA (active RS-232 communication);
    ~25 mA (measurement)
  • Analog Input/Outputs: 2 differential (DF) vibrating wire measurements (V+ and V-) and 2 single-ended (SE) ratiometric resistive half-bridge measurements (T+ and T-) for vibrating wire sensor's onboard temperature sensor.
  • Digital Control Ports: 3 digital control ports (C1 – C3). C1 functions as an SDI-12 I/O communication port. C2 functions as a Clk output for multiplexer control. C3 functions as a reset output for multiplexer control.
  • RS-232 Port: 1 9-pin RS-232 port for connecting to a datalogger COM port
  • Measurement Resolution: 0.001 Hz RMS
    (±250 mV differential input range; -55° to 85°C)
  • Measurement Accuracy: ±0.013% of reading (±250 mV differential input range; -55° to 85°C)
  • Input Range: ±25 V
  • Baud Rates: selectable from 1200 to 38.4 kbps. ASCII protocol is one start bit, one stop bit, eight data bits, and no parity.
  • Memory: either 128 or 512 kB of SRAM;
    2 MB of OS Flash
  • CE Compliance Standard to which Conformity is Declared: IEC61326:2002
  • Dimensions:
    21.6 x 11.18 x 3.18 cm
    (8.5” x 4.4” x 1.25”)
  • Weight: 0.43 kg (0.95 lb)

Refer to manual for additional specifications.