National Instruments 788511-01

The National Instruments 788511-01 Sound and Vibration Module, also known as the PXIe-4468, is engineered for high-precision measurements in sound and vibration applications. This module features two simultaneously sampled input channels which support both differential and pseudodifferential configurations, complimented by software-selectable AC/DC coupling. Utilizing a 24-bit delta-sigma analog-to-digital converter (ADC), it accommodates sampling rates from 100 S/s to 250 kS/s. The 788511-01 offers six gain settings for flexible input range configurations and provides maximum overvoltage protection of ±42.4 V peak.

In addition to input capabilities, the module includes two simultaneous analog output channels that can be configured in differential or pseudodifferential mode, supporting AC and DC coupling with 24-bit delta-sigma digital-to-analog converters (DACs). Output sample rates range from 100 S/s to 200 kS/s, and the channels also feature software-selectable attenuation. A FIFO buffer of 1,023 samples enhances data transfer efficiency via direct memory access (DMA) or programmed I/O.

The input amplifier characteristics ensure reliable signal integrity, boasting high input impedance and a common-mode rejection ratio (CMRR). The module achieves an alias-free bandwidth of up to 101.536 kHz and an impressive alias rejection of 105 dBc. Compatibility with Transducer Electronic Data Sheet (TEDS) under the IEEE 1451 Standard and a maximum load capacitance of 10,000 pF further augment its capabilities. It also provides analog and digital triggering features for precise event detection and synchronization across multiple channels.

Designed to fit into various PXI Express and hybrid slots, the 788511-01 is housed in a compact 3U form factor with dimensions of 16 cm x 10 cm (6.3 in. x 3.9 in.) and a weight of 360 g (12.7 oz.). The unit operates effectively within a temperature range of 0 °C to 55 °C and has a maximum installation altitude of 2,000 meters above sea level. The 788511-01 is particularly suited for audio testing, automotive noise and vibration analysis, and machine condition monitoring applications.