The National Instruments 784278-01, also known as the PXIe-4481, is a high-performance 6-channel analog input module designed for advanced voltage measurement applications. With the capability for simultaneous sampling across all channels, this module is ideal for high-bandwidth voltage measurements. Each channel is independently software-selectable for either differential or pseudodifferential voltage measurements, supporting both AC and DC input coupling options. The 784278-01 employs a 24-bit Delta-Sigma analog-to-digital converter (ADC), achieving sample rates from 100 samples per second up to 1.25 MS/s, with an ADC modulator sample rate of 20 MS/s, ensuring high-resolution measurements.

This module accommodates a FIFO buffer size of 1,023 samples per task and 8,221 samples per channel, facilitating efficient data transfer via Direct Memory Access (DMA) or Programmed I/O. Additionally, it integrates advanced analog and digital filtering capabilities, enhancing accuracy in frequency domain measurements for dynamic signal analysis. Users benefit from independently adjustable gain settings, permitting a full-scale input range from ±0.5V to ±10V, which optimizes measurement accuracy for varying signal amplitudes.

The 784278-01 includes robust overvoltage protection, safeguarding against unexpected voltage spikes with ratings of ±30V for positive inputs and ±10V for negative inputs. Its timing and synchronization features include multiple timing engines and support for both internal and external timebases. The effective number of bits (ENOB) ranges from 13.1 to 13.5, depending on the set voltage range. Compatibility with Transducer Electronic Data Sheet (TEDS) according to the IEEE 1451 standard allows seamless integration with smart sensors.

This input module operates within a temperature range of 0°C to 55°C and has been rigorously tested for shock and vibration in adherence to IEC and MIL-PRF standards, ensuring reliable performance in demanding environments. The unit features a two-year calibration interval and meets international safety and electromagnetic compatibility standards, making the 784278-01 a trusted solution for a diverse array of voltage measurement applications.