Portable Dynamic Signal Analyzer - DU-844D

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.

Inquire

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

Table 1
Name	Detail
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)