National Instruments 780421-01

The National Instruments part number 780421-01 designates the USB-4432, an advanced Sound and Vibration Device specifically engineered for precise sound and vibration measurements. This versatile device features five analog input channels, four of which are equipped with integrated electronic piezoelectric (IEPE) signal conditioning suitable for accelerometers and microphones. Each input channel offers independent software-selectable AC/DC coupling, with a sampling range from 1 kS/s to 102.4 kS/s. It incorporates built-in antialiasing filters that dynamically adjust to the selected sampling rate, ensuring accurate data capture.

The USB-4432 boasts a common-mode rejection ratio (CMRR) of 45 dB across a frequency range of 20 Hz to 1 kHz and exhibits excellent total harmonic distortion (THD) characteristics. For input frequencies between 20 Hz and 20 kHz, the typical THD is -97 dB, with a maximum of -91 dB. For frequencies up to 46.4 kHz, the typical THD remains impressive at -95 dB, with a maximum of -89 dB. The device offers a spurious-free dynamic range (SFDR) of 104 dB for a -1 dBFS, 1 kHz tone. Each of the four active input channels has a programmable current setting of either 0 or 2.1 mA, with a compliance voltage of at least 20 V and an output impedance of 200 kΩ at 1 kHz. The typical analog input dynamic range is 101 dB, ensuring consistency and reliability in sound and vibration analysis. The USB-4432 connects via USB 2.0 and provides flexible input connectivity through one BNC connector per channel, facilitating seamless integration into various testing environments.