Automated accelerometer calibration
MB Dynamics announced its “4-in-1” multi device-under-test (DUT) automated accelerometer calibration system (MDAC). The “4-in-1” MDAC aims to facilitate simultaneous and accurate calibrations of up to four piezoelectric (charge or PE), IEPE (low-impedance voltage mode), or variable capacitive (VC) accelerometers (DUTs), of the same model and type, each weighing up to 20 grams, over frequencies from 1 Hz to 4000 Hz. The system can additionally perform automated single-DUT calibrations of PE, IEPE, velocity, piezoresistive, and VC accelerometers, as well as vibration sensors and transducers, over frequencies from 1 Hz to 10 kHz, using MB Dynamics’ own CAL50 calibration vibration exciter.
The automated multi-DUT capabilities afforded by the “4-in-1” MDAC is designed to help calibration technicians effectively enhance productivity, reduce measurement uncertainty, and mitigate risks of operator error by reducing the amount of time required to calibrate multiple accelerometers within a single protocol.
System automation afforded by the device is further supported by MB Dynamics’ proprietary Win475 software, along with an industry standard NI DAQ card. The software facilitates both single- and multi-DUT accelerometer sine calibrations with full NIST traceability and FFT processing at specified frequencies. It further allows for automated storage and retrieval of accelerometer data, test specifications, and calibration results. The software control afforded by the system virtually eliminates operator error by ensuring repeatability, optimal signal-to-noise ratio, and reduced measurement uncertainty. It further removes operator adjustment requirements for gain, vibration levels, or other parameters. End-users also have the option of using MB Dynamics’ experienced software engineering services team to integrate “4-in-1” MDAC data exports into a customer-specified database.
The associated hardware components of each “4-in-1” MDAC turnkey calibration system include five internal reference accelerometers (REFs), each with 100/mV sensitivity and weighing less than 20 grams, mounted inside of the CAL50. REFs are fully traceable to national standards and ISO 17025. The system also features both a single- and multi-DUT Expanded System Uncertainty (ESU) of ±1.2% at 100 Hz (minimum 3 mV signal), estimated in accordance with the ISO 16063-21 standard, and includes two test instrument mounting fixtures: one four-DUT and one single-DUT, each with a useable frequency range to 10 kHz. Additional system hardware components include the PC-controlled Model 405/407 multi-channel signal conditioner with automatic gain adjustments for REF and DUT; MB Dynamics Model 500VI power amplifier; calibration accessory kit; Windows 10 PC, monitor, keyboard and printer; user manuals; and full onsite installation, startup and training support.