The DU-844D Portable Dynamic Signal Analyzers is specially designed for modal experiment of force measurement method. Connecting to IEPE acceleration sensor and force sensor, DU-844D can be used for structural vibration test, as well as experimental modal analysis using hammer excitation method and exciter excitation method.
Compact, portable, easy to use, suitable for on-site testing
Built-in 24V/4mA biasing circuit, support IEPE sensors
Independent 24-bit A/D converter per channel with selectable sample rate of up to 128kHz for high resolution data
Built-in Butterworth low-pass filter, Butterworth high-pass filter and Anti-aliasing filter
High Performance DMA Data Transfer
Run on USB3.0 power, ideal for portable applications, no external power supply needed
Suport TEDS
| Number of Input Channels | 4 IEPE input channels |
| Input Coupling | Sin_DC, Dif_DC, AC, Sin_IEPE |
| Full-scale Voltage Value | ±0.05V, ±0.5V, ±5V |
| Indication Error | <0.5% of F.S. |
| Stability | 0.05%/h |
| Nonlinearity | 0.05% |
| Noise | ≤5μVRMS |
| LPF | |
| Transfer Characteristic | Butterworth low-pass filter |
| Cut-off Frequency (-3dB±1dB) | 10Hz, 30Hz, 100Hz, 300Hz, 1kHz, 3kHz, PASS |
| Flatness | <0.1dB (Within 2/3 of cutoff frequency) |
| Stop-band Attenuation | - 18dB/Oct. |
| HPF | |
| Transfer Characteristic | Butterworth high-pass filter |
| Cut-off Frequency (-3dB±1dB) | 0.3Hz, 1Hz, 3Hz, 10Hz |
| Flatness | <0.1dB (Above 2 times cut-off frequency) |
| Stop-band Attenuation | ≥-12dB/Oct. |
| Communication | USB3.0 |
| A/D Converter | 24 bits |
| Freq. Response | DC ~ 50kHz (+0.5dB ~ -3dB) |
| Max. Sampling Rate | 128kHz |
| Anti-aliasing filter | |
| Cut-off Frequency | 1/2.56 of sampling rate |
| Stop-band Attenuation | ≥-100dB/Oct. |
| Flatness | ±0.1dB (Within analysis frequency range) |
| Power Supply | USB power, 5W |
| Dimensions | 163.5×102×32mm |
| Weight | Approx. 410g |
| 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: 55Hz ~ 555Hz ~ 5Hz Drive amplitude (peak): 0.19mm Sweep frequency: ≤1Oct./min Duration of resonant: 10min Vibration direction: x, y, z |
Figure 1 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.
Spectrum Analysis Module (Optional)
Real-time and post FFT analysis, power spectrum analysis, frequency amplitude and phase, real and imaginary frequency, windowing, overlop, average
Frequency Response Analysis Module (Optional)
Built-in multiple frequency response estimation method, supports MIMO, frequency analysis and response, coherence function, impulse response
Modal Analysis Module (Optional)
Frequency response function method (including MIMO), environmental incentive modal analysis, SSI, characteristics of the system with random subspace algorithm ERA, strengthen EFDD frequency domain decomposition method, frequency domain identification methods, such as reference more complex index method (PolyLSCF)
| LC02 Impact Hammer | |
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| 1A102E IEPE Accelerometer | |
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| 1A302E IEPE Triaxial Accelerometer | |
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| DT-CZ002P Magnetic Base | |
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45-6 Model Packing Case | |
| USB3.0 Cable | |
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| IEPE Signal Cable | |
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| BNC Cable | |
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