Product Description

The basic model VC20 generates a fixed amplitude of 10 m/s² (RMS) at 159.2 Hz. This frequency was chosen because it corresponds to a radian frequency of 1000 s-1 where the following relationship exists for sine-wave signals: 10 m/s² acceleration = 10 mm/s velocity = 10 µm displacement The unit has just one on/off push-button. A bright OLED display shows frequency and amplitude, the amplitude error as a percentage and the battery condition. Its powerful electrodynamic shaker allows the calibration of heavy test objects up to 600 grams. The built-in NiMH accumulator lasts for approximately 5 hours of operation. A cast aluminum enclosure protects the instrument under harsh field conditions.

Model VC21D is a modified version of the VC21. It can calibrate, in addition to accelerometers and velocity transducers, noncontact displacement sensors, also called proximity or Eddy current probes. The instrument enables dynamic calibrations of such sensors. The VC21D provides the same frequencies and amplitudes as Model VC21. The only differences are its detachable clamping device for proximity probes and a TTL clock output via a BNC socket. This clock output can be useful to simulate a Keyphasor signal in monitoring systems. The clamping device has a movable, vibration isolated slider to adjust the height of the proximity probe above a vibrating disk made of 2CrMo4 reference steel. The probe is held by replaceable thread adapters which are available in the common probe sizes of M6x0.5, M8x1, M10x1, M14x1, M20x11/4”-28, 3/8”-24 and 1/2”-20. The clamping device was optimized for calibrations at 159.2 Hz. The clamping device is held by two magnetic sockets. After removing it the VC21D can be used like the standard VC21.