National Instruments 778279-01 PXI Sound and Vibration Module

The dynamic signal acquisition module 778279-01 from National Instruments is a member of the PXI-4472 Model series. With eight input channels enabling simultaneous digitization of input signals, it is specially made for sound and vibration measurements. Integrated electronic piezoelectric (IEPE) signal conditioning for accelerometers and microphones is incorporated into these channels. Without requiring additional external filters, the module's integrated anti-aliasing filters avoid aliasing by automatically adjusting to the sample rate.

The 778279-01 efficiently eliminates any signals with frequency components outside the range of the analog-to-digital converters (ADCs) by implementing both analog and real-time digital filters in hardware, guaranteeing precise measurements. With a 1,024-sample analog input FIFO buffer, it prevents data loss and uses a PCI mini-MITE for high-speed data transfer rates.

Pretrigger and posttrigger are the two trigger modes that this module offers for signal capture. A trigger can come from a number of places, including software commands, external digital trigger inputs, PXI trigger buses, RTSI buses, or analog input channels. Due to its TTL/CMOS compatibility, the external digital trigger offers a wide range of triggering situations.

The PXI star trigger bus can be used to synchronize numerous 778279-01 devices for applications that need high channel counts. Minimal phase mismatch across channels is ensured by this synchronization, which is essential for getting precise phase information in cross-channel measurements.

The 778279-01 module, with its input signal range of ±10 V and frequency precision of ±25 ppm, is ideally suited for applications in vibration and audio analysis. It integrates seamlessly with other National Instruments hardware and software products, including NI LabVIEW, LabWindows/CVI, and Measurement Studio, thanks to the use of NI-DAQmx as the hardware and operating system interface.

When the 778279-01 module is used with the NI Sound and Vibration Toolkit or the NI Sound and Vibration Measurement Suite, a number of studies can be produced, such as power spectra, frequency responses, sound-level measurements, and order extraction.