振弦式接口 / AVW200
AVW200 振弦式接口
极大的降低信号噪声
频谱分析,高分辨率,结果更好
气象 应用支持 水资源 应用支持 能源 应用支持 湍流通量 应用支持 基础结构/工业设施 应用支持 土壤 应用支持

概览

AVW200 振弦频谱分析仪模块允许我们的数据采集器测量无线振弦式应变计,压力传感器,压强计,斜度仪,压式传感器等。这些传感器精确、耐用并且稳定,被广泛应用于建筑、水文和地理地质等方面。

Learn about our patented VSPECT® spectral-analysis technology at our VSPECT® Essentials web resource.

The dynamic vibrating-wire measurement technique is protected under U.S. Patent No. 8,671,758, and the vibrating-wire spectral-analysis technology (VSPECT®) is protected under U.S. Patent No. 7,779,690.

优势与特点

  • Provides better measurements by significantly reducing incorrect readings caused by noise sources
  • Interfaces two vibrating-wire sensors; more sensors may be connected if an AM16/32B multiplexer is used
  • Self-checking diagnostics give continual feedback on sensor condition
  • High resolution—less than 0.001 Hz (industry standard is 0.1 Hz)
  • Low current drain
  • Interfaces both temperature and frequency measurements from vibrating-wire sensors

图像

技术说明

AVW200 利用创新的频谱插值法测量传感器的谐振频率。运用这种方法,模块激活弦震传感器,测量响应时间,傅里叶变换情况,在2秒钟内以优于0.001 Hz&mdash的分辨率返回测量结果。频谱分析可以从频率组成的噪声中将信号区分出来,这种方法帮助改进抵抗噪声的能力。

AVW200 模块也提供了许多自检诊断,如振动元件信号强度、信噪比、振动元件信号衰减率,和不正确的信号响应。这些诊断可以在后台运行,为每个传感器的情况不断地给出反馈。

产品规格

-NOTE- Electrical specifications are valid over a -25° to +50°C range unless otherwise specified. Non-condensing environment required.
Number of Vibrating-Wire Sensors Measured Up to 2 vibrating-wire sensors can be connected to the analyzer module. Additional sensors can be measured by using an AM16/32-series multiplexer.
Power Requirements 9.6 to 16 Vdc
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 data logger 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 Voltage Range ±250 mV (differential) for vibrating-wire inputs
Common Mode 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 Standards 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 in.)
Weight 0.43 kg (0.95 lb)

Typical Current Drain @ 12 Vdc

Quiescent, Radio Off ~0.3 mA
Radio Duty Cycling 1 s ~3 mA (includes quiescent current)
Radio Always On ~26 mA (radio transmit current 100 mA)
Active RS-232 Communication ~6 mA (3 s after communication stops, the current will drop to the quiescent current.)
Measurement ~25 mA (averaged over the 2 s)

兼容性

Please note: The following shows notable compatibility information. It is not a comprehensive list of all compatible products.

数据采集器

Product Compatible Note
21X (retired)
CR10 (retired) The CR10 supports the SDI-12 mode only.
CR1000X
CR10X (retired) The CR10X supports the SDI-12 mode only.
CR200X (retired)
CR206X (retired)
CR211X (retired)
CR216X (retired)
CR23X (retired) The CR23X supports the SDI-12 mode only.
CR295X (retired)
CR300
CR3000
CR310
CR500 (retired)
CR5000 (retired) The CR5000 supports the SDI-12 mode only.
CR510 (retired)
CR800
CR850
CR9000 (retired)

固定设备

Product Compatible Note
ENC10/12 If using the RS-232 port, the AVW200 must be mounted flat to fit in an ENC10/12.
ENC10/12R If using the RS-232 port, the AVW200 must be mounted flat to fit in an ENC10/12R.
ENC12/14 If using the RS-232 port, the AVW200 must be mounted flat to fit in an ENC12/14.
ENC14/16
ENC16/18
ENC24/30
ENC24/30S

Additional Compatibility Information

Sensors

The AVW200 Vibrating-Wire Spectrum Analyzer Module allows our data loggers to measure vibrating-wire strain gauges, pressure transducers, piezometers, tiltmeters, crackmeters, and load cells.

Data Logger Connections

When using SDI-12, a three-conductor cable is required; Campbell Scientific recommends the CABLE3CBL-L cable. When using RS-232, the module attaches to the data logger’s RS-232 port via the 18663 null modem cable, or attaches to control ports on a CR800, CR850, CR1000, or CR3000 datalogger via the 17855 data cable.

Enclosure Considerations

The AVW200 requires a desiccated, non-condensing environment. A Campbell Scientific enclosure is recommended when the analyzer module is in the field. The AVW200 has built-in keyhole flanges for mounting to an enclosure backplate.

Power Considerations

The AVW200 is typically powered by the data logger's power supply.

下载

AVW200 OS v.06 (551 KB) 10-06-2016

Current AVW200 firmware. Use the Device Configuration Utility version 1.13 or greater to send firmware and to configure the AVW200.

查看修订历史

常见问题解答

AVW200: 9

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  1. The AVW200-series modules are not required, but they do reduce the chance of erroneous readings by filtering electrical noise that is sometimes present.

  2. The AVW200 must be wired directly to the data logger via a cable.

    The AVW206, AVW2011, and AVW216 have built-in spread-spectrum radios tuned to different frequencies that allow the data logger to communicate with a remote AVW device through an appropriate radio link.

  3. Two probable causes are the following:

    • The SerialOpen() instruction has not been added to the data logger code.
    • The correct PakBus address setting has not been used in the AVW200 instruction.
  4. It takes 2 s for the AVW200-series modules to acquire a measurement from each sensor. An AVW200-series module servicing two AM16/32B multiplexers, each with 16 vibrating-wire sensors, requires approximately 64 s to acquire data.

  5. Dozens of AVW200-series modules can be accessed through one CR1000. The limiting factor is the frequency at which the CR1000 is set to retrieve data from each module. If the CR1000 needs to collect data very frequently from the modules, fewer AVW200-series modules can be accommodated in the time between data collection events.

  6. Two multiplexers, each with a maximum of 16 or 32 sensors per multiplexer, can be attached. If temperature measurements are excluded from each sensor, 32 sensors are possible.

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