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AD-3651 Compact WCA
Noise & Vibration analyzer

FFT Analyzer    
Compact WCA AD3651
Noise & vibration analyzer, from
in-vehicle order tracking to MIMO analysis.

PDF Brochure (PDF 839KB)

We, A&D Company, are proud to introduce our brand new Compact WCA for analysis of noise and vibration for in-vehicle order tracking analysis.The long time experience and know-how of A&D in the automobile field of instrumentation and listening to user suggestions are what gives the A&D model the lead with its unmatched specification and functions. Best of all is its compact size and light weight. At the same time, all the functions you would expect to find in multi channel noise and vibration analyzers are included, plus more enhanced features.

The features are impressive performance in a compact package from in-vehicle order tracking to MIMO analysis, as follows.


Compact-True ISO A4 Size (210 x 297mm)
24-bit ADC
Dynamic Range 100dB
Real-Time Octave Analysis
Multi Tacho Inputs
Throughput Acquisition to Disk (standard)
Multi-Input Multi-Output (MIMO) Analysis (standard)
Powered by DC, AC, or Backup Battery

Powerful Analysis Software

Multi-Analysis Software WCA Pro
WCA Pro, the base software for Compact WCA, has user interface of Windows operability. WCA Pro provides real-time FFT analysis for noise & vibration testing. Optional licenses for integrating real-time octave analysis and tracking analysis are available. The system comes standard with throughput acquisition, allowing continuous recording of time history data to disk and repeated playback analyses. Off-line playback analysis with a standalone PC is also possible (option).

FFT Analysis / MIMO Analysis

The testing efficiency of real-time multi-channel FFT analysis is ensured by ease of operation and well designed Compact WCA data management. A variety of post-processing tools are also available. A signal generator for 1 or 2 channels (up to 4 channels in a 32-ch system) is optionally available. The standard system includes MIMO (Multi-Input Multi-Output) analysis, which calculates multiple structural responses caused by multiple excitation forces.

Real-Time Octave Analysis
1/1, 1/3, 1/6 and 1/12 octave analyses are supported. Simultaneous measurements with FFT analysis are possible.

Tracking Analysis
A wide range of analyses, such as order ratio analysis, RPM tracking, time tracking, octave tracking, phase tracking, Campbell plot, are supported. Multi tacho analysis is also available.

Flexible Menu Customization / Routine Automation
COM support capability enables complete control of the Compact WCA system with external application software such as Microsoft Excel. Customized menu design and automated routine processing are possible.

Throughput to Disk
Time history data can be recorded on the hard disk of the PC for playback analyses. Off-line analysis on a standalone PC is also available with off-line license. The recorded throughput data can be exported in WAV format.

System Configurations
The Compact WCA system is scalable from 4, 8 to 16 channels in a single A4 size front-end. Expansion to a 32-ch configuration is obtained by a synchronized connection of two 16-channel front-ends. Flexibility is provided to allow two separate mainframes with 4, 8, or 16 channels to be operated as a single 8, 16, or 32 channel system, and vice versa, by synchronizing the dual mainframes. The front-end hardware is connected to a PC via LAN (100Base-T).

4,8 or 16-ch System

4,8 or 16-ch System

4,8 or 16-ch System

8,16 or 32-ch System



Input section
Number of Inputs 4, 8, 16, 32 (32 by synchronized dual front-end connection)
Input Impedance   1MΩ
Input Coupling AC, DC, ICP
Input Range -20dBVrms to +20dBVrms
Trigger Source Input Channel, External Input (Optional), SG (Optional)

Analysis Section
Frame Size 64, 128, 256, 512, 1024, 2048, 4096, 8192, 16384, 32768, 65536
Frequency Range 1Hz to 40kHz
Real-time Analysis 20kHz or higher on 16 channels(when a suitable PC is used)
A/D Converter 24 bits
Dynamic Range

100dB (Typical)

Analytical Functions
Time Function, Time Averaging Function, Spectrum, Auto-Power Spectrum, Complex Spectrum, Energy Spectrum Density Function, Power Spectrum Density Function, Cross Spectrum, Phase Spectrum, Frequency Response Function (H1, H2, H3, Hv), Ordinary FRF, Coherence Function, Multiple Coherence Function, Partial Coherence Function, 1/1, 1/3, 1/6, 1/12 Octave

Plot Window Max. 16 windows for simultaneous display
Overlaying Max. 8 traces (2D display)
Display Scaling Auto/fixed scale, X-axis linear/log, Y-axis linear/log/dB, Z-axis linear/log/dB
Format 2D display (Amplitude, Bode plot, Nyquist plot, Co-Quad plot, Orbit)

3D display (Map, Campbell plot, Color spectrogram)

Block Arithmetic Functions
+, -, *, /, Complex conjugate number, Discrete fourier transform, Fast fourier transform, Inverse discrete fourier transform, Inverse fast fourier transform, Time-domain differentiation/integration, Frequency-domain differentiation/integration, Trigonometric function, Hilbert, Inverse Hilbert, Exponent, Logarithm, Natural logarithm, Amplitude, Phase, Square root, Envelope, Averaging, Acoustic weighting, Smoothing, Interpolation, 1/1; 1/3; 1/6; 1/12 octave

Data Save and Recall
Analyzer conditions, Plot conditions, MFU files

Print Output
Plot window, List display window

Copy and Paste
Plot window (Enhanced metafile), Data list

2D Cursor Single cursor (X, Y cursor, Peak fit, Damping factor, Harmonic, THD)
  Dual Cursor (Band cursor, Delta cursor, Overall, Max/min values)
3D Cursor X, Y cursor (Cursor cut in 2D slice possible)

Data Management (Function Storage)
MFU file read-in/read-out, Plot (graphic) display, Data value list display (dB/Lin), Data value editing, Data attributes editing (channel label, coordinates, etc)

Order Tracking (Optional)
Processing Constant ratio RPM tracking, Constant band RPM tracking, Order tracking analysis band width (frequency/order), Octave band tracking (1/1, 1/3, octave), Phase tracking, Cross spectrum, Transfer function, Spectrum map, Campbell plot, Color spectrogram

Max. Analysis Order 1600 degrees (at internal sampling)
Analysis Order Range

6.25, 12.5, 25, 50, 100, 200, 400 degrees

3D Cursor Spectrum map, Campbell plot, 2D slice from color spectrogram (order, frequency, record)

Real-time Octave Analysis (Optional)
Analysis Function 1/1, 1/3, 1/6, 1/12 octave
Filter Method Digital filter
Standards 1/1oct (ANSI S1.11, JIS C1513 Type II)
  1/3oct (ANSI S1.11, JIS C1513 Type III)
Number of Bands
1/1oct 16Hz to 16kHz (11 bands)
  1/3oct 12.5Hz to 20kHz (33 bands)
1/6oct 10.6Hz to 18.8kHz (66 bands)
  1/12oct 10.3Hz to 19.4kHz (132 bands)
Averaging No averaging, Linear, Exponential, Peak
Time Weighting 0.001 to 1000 seconds

Signal Generator (Optional)
Number of Outputs 1 to 4 (3 to 4 by synchronized dual front-end connection)
Output Impedance 50Ω
Signal Output Voltage ±2.5V max.
DA Converter 24 bits
Signal Frequency 40 kHz max.
Waveforms Sine wave, Pure random
Waveform Attributes Burst control, Lump control, Sweep control

External Dimensions 100(H) x 297 (W) x 210 (D) mm (protrusions excluded)
Weight 3 to 5kg
Power Supply 11 to 17V DC, AC adapter, Backup Battery (Optional)
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