Vibration Calibrators

Vibration calibrators are vibration exciters providing a sinusoidal mechanical output at constant frequency and magnitude. They are used to determine the sensitivity of vibration sensors and measuring chains. Metra has been manufacturing vibration calibrators for more than 5 decades. Today we offer a series of devices covering most applications of field calibration. Applications include:

• Test and sensitivity measurement of accelerometers and velocity transducers
• Test and sensitivity measurement of Eddy current probes (VC21D)
• Measurement of frequency response (VC120)
• Function test and fault finding in measuring chains and sensor cable installations
• Evaluation of sensor coupling parts The instruments are battery-powered making them suitable for both field and laboratory use.

Metra’s vibration calibrators are known to be robust and powerful devices. Their outstandingly high payload makes them a good choice for the excitation of heavy objects. Test objects are attached by an M5 threaded hole, by a magnet or adhesively. Metra’s vibration calibrators are supplied with a traceable calibration certificate. DKD calibration can be offered on demand.

Sweep

VC120

The VC120 is a stand-alone calibration device with:

• Piezoelectric vibration exciter and power amplifier
• Frequency from 70 Hz to 10 000 Hz
• Built-in reference accelerometer
• Directly connect output signal from accelerometer (Charge, IEPE (ICP), Voltage) 
• Sensitivity display with physical units
• Stand alone or PC control by USB
• Rechargeable battery

The VC120 works at a constant amplitude of 1 m/s² (RMS). The frequency is adjustable in fine intervals from 70 Hz to 10 kHz. It can be adjusted by a shuttle wheel. Alternatively, all settings can be made by the supplied PC software via a USB interface. Thus the VC120 can also measure frequency sweep diagrams. A backlit LCD shows the adjusted frequency and the measured transducer sensitivity either in metric or in imperial units. The built-in NiMH accumulator lasts for 2 to 4 hours of calibration. In spite of its compact design the instrument is portable and features a variety of functions, which are known only from more expensive systems.

Metra’s vibration calibrators are supplied with a traceable calibration certificate. DAkkS accreditation can be offered on request.

Technical Specifications