Model CAL25HF high-frequency electrodynamic air bearing vibration exciter offers improved transverse performance over traditional flexural-based calibration exciters, with reliable operation over an operating bandwidth of 3 Hz to 20 kHz. It is available as either a stand-alone unit, or as part of a larger automated calibration test system. The high-reliability air bearing design of the Model CAL25HF incorporates a lightweight Beryllium (Be) armature and removable Be test instrument mounting fixture (TIMF), for the necessary high stiffness, low mass and high resonant frequency required for accurate, repeatable performance.
Pneumatic-based automatic payload re-centering helps to mitigate the risks of unwanted noise on the armature. The Model CAL25HF further features an IEPE internal reference accelerometer with 20 mV/g sensitivity (optional 100 mV/g), not built into the armature. The internal reference accelerometer offers a <1 Hz to 55 kHz usable frequency range, 70 kHz mounted resonance and extremely low sensitivity to thermal drift. Back-to-back calibrations of the Model CAL25HF are performed by comparing device-under-test (DUT) output to known reference accelerometer output values. The Model CAL25HF is compliant with ISO 16063-21, Clauses 4.3 & 4.4, with its transverse motion specifications meeting ISO 16063-21.
Typical applications for the Model CAL25HF include high-volume accelerometer calibrations, sensor manufacturing quality assurance testing, and in-laboratory R&D instrumentation verifications. Units are designed to accurately calibrate accelerometers and vibration sensors with diameters of up to 70 millimeters and weights of up to 910 grams. The Model CAL25HF is one of three high-performance air bearing exciters available from MB Dynamics. Each offers low cross-axis sensitivity and low distortion motion performance. Other offerings include the Model CAL25AB, operating to 15 kHz; and the Model CAL12AB, operating to 15 kHz, with lower rated force output. Please consult the factory for additional product details.
Features:
- Air bearing design
- Calibration bandwidth of 3 Hz to 20 kHz
- Provides improved transverse performance over traditional flexural based exciters
- Lightweight Beryllium (Be) armature with removable Be test instrument mounting fixture (TIMF) moving element
- Automatic payload re-centering (pneumatic) helps mitigate risks of unwanted noise on the armature
- User-replaceable reference accelerometer, not built-in to the armature, for minimized transverse motion
- IEPE internal reference accelerometer with 20 mV/g sensitivity; usable range of <1 Hz to 55 kHz; 70 kHz mounted resonance (optional 100 mV/g version)
- Internal reference features extremely low sensitivity to thermal drift
- Capable of resonance frequency search of device under test (DUT) to 50 kHz (max.)
- Capable of 18 g RMS max. acceleration level
- Max. force output: 25 lb.
- Axial resonance of 50 kHz ±5% Moving Element
- Complies with ISO 16063-21, Clauses 4.3 & 4.4
- Transverse motion meets ISO 16063-21
- Max DUT weight/payload: <910 gm
- Transducer mount: Female 10-32 thread (1/4-28 opt.)
- Max stroke, between stops: 13 mm pk-pk
- Continuous stroke for calibration 10 mm pk-pk max.
- High calibration throughput
- Air supply: 6 bar, 150 l/m; 90 psi, 5 CFM
Dimensional specifications:
- CAL25HF Diameter: 74 mm
- Exciter: 190 mm
