The WW-844D Wireless Dynamic Strain Test and Analysis System, with the use of independent distributed module structure, specially designed for the strength and life evaluation test of large mechanical structure. Expanded via wireless WiFi communication, the input signal of dynamic stress-strain of no more than 16 DAQ units can be measured and analyzed in parallel and synchronously by a single computer. WW-844D is widely used for the performance testing and analysis of various structure in a variety of industries such as civil engineering, bridge engineering, mechanical engineering, automotive industry, aerospace.
Samll and portable, directly installed in the measuring point, fixed with magnet base
Standard 2.4G wireless WiFi communication technology, communication distance up to 200m (visual), optional
wireless relay for longer wireless transimission distance
Software settable full bridge, half bridge and three-wire quarter bridge configuration
Built-in large capacity rechargeable lithium battery, over 7h of battery life
Any measuring point can be set as the compensation point
Highly real-time, real-time acquisition, real-time display, real-time storage, real-time analysis
In addition to the measurement of stress and strain signals, the physical quantities such as acceleration, force,
pressure, displacement, load and temperature can also be measured, and the signal of voltage can also be measured
accurately
WW-844D-S with AP mode and WW-844D-L with both AP mode and IP65 rating are available
| Number of Input Channel | 4 channles/DAQ unit, 16 DAQ units/computer |
| Full-scale Voltage Value | ±0.003V, ±0.03V, ±5.0V |
| Nonlinearity | 0.1% |
| Noise | ≤3μVRMS |
| Zero Drift | <3μV/h |
| Strain Measurement | |
| Full-scale Strain Value | ±3000με, ±30000με |
| Indication Error | ≤0.5％±3με |
| Self-balancing Range | ±10000με |
| Bridge Excitation | |
| Bridge Configuration | Full, Half, Three-wire quarter bridge (Default 120Ω) |
| Bridge Completion Resistors | 120Ω/350Ω (Three-wire quarter bridge) 60Ω~20000Ω (Half bridge/Full bridge) |
| Bridge Voltage | 2V, 5V DC |
| Freq. Response | DC ~ 2kHz |
| A/D Converter | 24-bit Σ-Δ |
| Max. Sampling rate | 10kHz |
| Sync. Mode | GPS / Beidou |
| Anti-aliasing filter | |
| Cut-off Frequency | 1/2.56 of sampling rate |
| Stop-band Attenuation | - 80dB/Oct. |
| Flatness | <±0.1dB |
| Comm. Mode | WiFi |
| Comm. Distance | 200m (Visual) |
| Power Supply | Lithium battery, over 7h of battery life (fully charged) |
| Dimensions | 135×85×55mm (Exclu. antenna) |
| Weight | Approx. 499g (Exclu. antenna) |
| Environmental Conditions | |
| Operating Temperature | - 10°C to 50°C |
| Operating Humidity | 20 ~ 90%RH@40°C |
| Storage Temperature | - 40°C to 60°C |
| Storage Humidity | 90%RH24h@50°C |
| Vibration | Frequency cycle range: 5Hz ~ 55Hz ~ 5Hz Drive amplitude (peak): 0.19mm Sweep frequency: ≤1Oct./min Duration of resonant: 10min Vibration direction: x, y, z |
Figure 1 Single System Block Diagram
Figure 2 Multiple System Block Diagram
DE-BPS Basic Platform Software
Running on XP/Win7/Win8/Win10 operating system
Parameters setting, Function control, Real-time/post-acquisition analysis, data browsing, cursor readouts, scaling curve, data management and simple processing, report generation, long-term continuous data recording, etc.
AP01 Android Software App (Optional)
Mobile phone control and analysis
Parameter setting, sampling control, data management, etc.
Time domain & amplitude domain analysis
Frequency domain analysis based on FFT
Download APP software through the QR code on the collector
| WW-844D DAQ Unit | |
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| WW-844D-S DAQ Unit (Optional) | |
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| WW-844D-L DAQ Unit (Optional) | |
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| GPS01 GPS Module (Optional) | |
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| DT15211 Lithium Battery Module (Optional) | |
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WW-844D-L Signal Input Cable | |
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