VWIRE305 8-Channel Dynamic Vibrating-Wire Analyzer
Maximize Your High-Speed, Dynamic Applications
With time-proven reliability and stability of vibrating-wire sensor technology
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The GRANITE™VWIRE 305 is an eight-channel interface for dynamic measurements of standard single-coil circuit vibrating-wire sensors. With the VWIRE 305 interface, you can operate traditional “static” gages at “dynamic” rates to achieve faster and better measurements without having to purchase or install new sensors.

The interface measures the resonant frequency of the wire between excitations using the patented vibrating-wire spectral-analysis technology (VSPECT™). VSPECT provides very fine measurement resolution and limits the influence of external noise by discriminating between signal and noise based on frequency content. Because of this technology, the signal can be carried through longer cables in harsher noise environments, giving you flexibility in your sensor and data-acquisition system siting.

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.

Funktionen und Vorteile

  • Dedicated measurement hardware for simultaneous measurement of each channel
  • Interfaces to any standard single-coil vibrating-wire sensor
  • Eight simultaneously sampled channels per module; synchronized across multiple modules
  • Dynamic measurement rates of 20 to 333 Hz
  • Static measurement vibrating-wire and thermistor measurements at 1 Hz
  • VSPECT® spectral interpolation algorithms provide superior noise immunity and measurement resolution compared to time-domain period-averaging approach
  • Excitation method providing frequent low-energy pulses to maintain a continuous resonant vibration in the sensor
  • Onboard post-processing including frequency conversion, temperature conversion, and rainflow histogram calculation
  • CPI DAQ connection for channel expansion
  • USB 2.0 interface for PC-based operation



-NOTE- Electrical specifications are valid over a -40° to +70°C range, non-condensing environment, unless otherwise specified. Extended electrical specifications are valid over a -55° to +85°C range in a non-condensing environment.
Operating Temperature Range
  • -40° to +70°C (standard)
  • -55° to +85°C (extended)
Scan Rates 20, 50, 100 Hz
CPI Baud Rate Selectable from 25 kbps to 1 Mbps
Input Resistance 5 kΩ
Excitation Voltage Range 0 to ±3 V (6 V peak-to-peak)
Excitation Voltage Resolution 26 mV
Measurement Frequency Accuracy ±(0.005% of reading + measurement resolution)
Sustained Input Voltage without Damage -0.5 to +7.1 V
USB USB 2.0 full speed connection is available for attaching the device to a PC. (This port is provided to configure the module, send updates, and communicate with the Dynamic Vibrating-Wire Toolbox software. The USB port is not provided for use within a permanent data collection system.)
CPI Used for connection to the data logger. Baud rate selectable from 50 kbps to 1 Mbps. (Allowable cable length varies depending on baud rate, number of nodes, cable quality, and noise environment, but can be as long as 2,500 ft under proper conditions.)
Mounting Standard 1-in. grid (Optional DIN rail mounting available.)
Dimensions 20.3 x 12.7 x 5.1 cm (8 x 5 x 2 in.)
Weight 816.47 g (1.8 lb)

Measurement Resolution at Sample Rates

-NOTE- Typical values for a 2.5 kHz resonant sensor
1 Hz Sample Rate 0.005 Hz RMS (noise level)
20 Hz Sample Rate 0.008 Hz RMS (noise level)
50 Hz Sample Rate 0.015 Hz RMS (noise level)
100 Hz Sample Rate 0.035 Hz RMS (noise level)
200 Hz Sample Rate 0.11 Hz RMS (noise level)
333.3 Hz Sample Rate 0.45 Hz RMS (noise level)

Sensor Resonant Frequency Range

20 Hz Sample Rate
  • 290 Hz (minimum sensor frequency)
  • 6000 Hz (maximum sensor frequency)
50 Hz Sample Rate
  • 290 Hz (minimum sensor frequency)
  • 6000 Hz (maximum sensor frequency)
100 Hz Sample Rate
  • 580 Hz (minimum sensor frequency)
  • 6000 Hz (maximum sensor frequency)


Completion Resistor 4.99 kΩ 0.1%
Excitation Voltage 1.5 V
Resolution 0.002 Ω RMS (@ 5 kΩ thermistor resistance)
Accuracy 0.15% of reading (Thermistor accuracy and resistance of the wire should be considered as additional errors.)
Measurement Rate 1 Hz

Power Requirements

Voltage 9.6 to 32 Vdc
Typical Current Drain 190 mA (@ 12 Vdc)

Kompatibel mit

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


Product Compatible Note
CR1000X Requires OS version 4 or greater.
CR6 Requires OS version 10 or greater.


Product Compatible Note
GRANITE10 Requires OS version 1 or greater.
GRANITE6 Requires OS version 1 or greater.
GRANITE9 Requires OS version 1 or greater.

Additional Compatibility Information

The VWIRE 305 is compatible with CPI-enabled data loggers only.


DVW Tool Box v.1.3 (13.4 MB) 04-11-2019

DVW Tool Box is an application-specific software tool for demonstration and evaluation of the CDM-VW300, CDM-VW305 and VWIRE 305 dynamic vibrating-wire interfaces.

Liste der Änderungen

VWIRE 305 OS v.6 (602 KB) 21-04-2020

Execution of this download installs the VWIRE 305 Operating System on your computer for upload to the VWIRE 305 device with Device Configuration Utility.

Liste der Änderungen

VWIRE 305 program example v.1 (2 KB) 16-01-2020

Program to read 20 Hz dynamic data from two GRANITE VWIRE 305 analyzers measuring eight channels each.