The calibrating procedure is automatically controlled by a computer. The system is used to measure the frequency and amplitude of a standard reference accelerometer and the sensor to be calibrated. The sensor’s frequency response curve and sensitivity is thus calibrated by comparison of the different measurements (the so-called back-to-back method).
The system can be used in research institutions, laboratories of vibration research, and for the design and production of sensors.
The system can also calibrate the sensitivity and frequency response curve of velocity sensors. Velocity sensors are widely used in petroleum exploration, for monitoring machine vibrations in the laboratories, etc.
2. Component
• WS-5937 Control and Data Acquisition Instrument
• JZ-2A High Frequency Exciter or JZ-20C Low Frequency Exciter
• CK8305 or BK8305 Standard Reference Accelerometer (optional)
• Computer (optional)
• Vib’SIN Software
3. System Diagram
4. Vib’SIN Calibration Software Functions
• Sweep sine wave according to user-defined spectral line and amplitude
• Sweep sine wave according to equal interval spectral line and amplitude
• Draw frequency response curve in linear or Logarithmic Coordinates
5. Specification
| 5.1 WS-5937 Control and Data Acquisition Instrument | ||
| Data Acquisition and Integrated D/A Signal Generation 1) USB computer interface. It is compatible with USB1.1 and USB2.0 2) 8 Channels A/D 3) D/A sweep sine frequency range from 0.1Hz to 50kHz 4) Frequency control accuracy is 0.01Hz 5) Amplitude control accuracy is 0.1%FS 6) D/A sine signal output 7) Maximum sample rate of 500kS/s 8) Power supply range is 100V~240V(AC) 9) Dimensions: 367×70×365mm Charge Amplifier 1) OLED display 2) Channel: 2 3) Input range: 0.1pC to 50000pC for charge 4) Gain£º6 5) Sensitivity conditioning: 0.1~999 6) Accuracy: Acceleration: ≤±0.5£¥ Velocity: ≤±0.5£¥ Displacement: ≤±2.0£¥ 7) Frequency range: Acceleration: 0.3Hz~50kHz Velocity: 1.0Hz~10kHz Displacement: 1.0Hz~1kHz 8) Low-pass filter (Hz): Programable range: 1Hz~50kHz Its attenuation slope is -80dB/Oct 9) Input voltage: ±10V 10) Input connector: Female 10-32UNF (M5 hole) connector 11) Overload indicator: When input signal is overloaded (greater than ±9.8V) 12) Inherent noise (converted to the input): ≤5×10-3pC 13) Input resistance: 1012Ω 14) Output resistance: <1Ω 15) Input current: 15mA 16) Working temperature: -10~50¡æ 17) Humidity: 0 to 85%RH (non-condensing) Power Amplifier 1) Maximum power: 30VA 2) Maximum current: 3A 3) Maximum output voltage: 10V 4) Frequency range: 10Hz to 20kHz 5) Output resistance: 6Ω 6) Distortion: <2% 7) Noise: 2mV |
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| 5.2 Exciter (Two Option) | ||
| Model: JZ-2A (High Frequency) 1) Freq. range: 60Hz~9.0kHz 2) Maximum current: 2.5A 3) Maximum load: 110g  |
Model: JZ-20C (Low Frequency) 1) Freq. range: 0.1Hz~ 500.0Hz 2) Displacement: ±10mm 2) Maximum current: 10A 3) Maximum load: 500g  |
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5.3 B&K Standard Reference Accelerometer
Model: BK8305 (Optional)
1) Producer: B&K (Denmark)
2) Standard: ISO 5374
3) Charge sensitivity: 1.25pC/g
4) Resonant frequency: 38kHz
5) Frequency range: 1 to 5000Hz
6) Maximum acceleration limits: 1000g (shock)
7) Weight: 40g
8) Temperature range: -101°F to 392°F (-74°C to 200°C)
9) Application: It is the standard reference accelerometer for the precise
calibration of vibrations of transducer’s sensitivity and frequency
response curve.
5.4 WS Standard Reference Accelerometer (It is much cheaper than BK8305)
Model: CK8305
1) Charge sensitivity: 1.25pC/g
2) Frequency range: 1 to 5000Hz
3) Resonant frequency: 35kHz
4) Maximum acceleration limits: 1000g
5) Weight: 45g
6) Temperature range: -4°F to 176°F (-20°C to 80°C)
7) Application: It is the standard reference accelerometer for the precise calibration
of vibrations of transducer’s sensitivity and frequency response curve. The cost
of this accelerometer is much cheaper than BK8305
6. Vib’SIN Calibration Software Panel (Frequency Response and Phase)
