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Detailed Specifications
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Last Revised: 2011-03-08 12:08:54.0
NI PXIe-4330
Data Acquisition with Integrated Signal Conditioning for Bridge-Based Measurements
8 simultaneously sampled analog input channels
Bult-in programmable quarter-, half-, and full-bridge completion per channel
25 kS/s/ch sampling rate; 24-bit ADC per channel; antialias filtering
0.02% of reading typical accuracy
Software-selectable shunt calibration options per channel
Multidevice triggering and synchronization via PXI Express
Supported by NI-DAQmx driver software
Software-selectable excitation voltage per channel (0.625 V to 10 V)
Overview
The NI PXIe-4330 simultaneous bridge input module provides data acquisition with integrated signal conditioning for measuring bridge-based sensors, such as strain gages, load
cells, and pressure transducers. It features eight channels with 24-bit analog-to-digital converters (ADCs) per channel and 25 kS/s sampling rate for simultaneous high-speed
measurements. To remove noise, each module offers antialiasing and digital filters per channel. Each channel also features an independent programmable 0.625 to 10 V
excitation voltage. Additionally, the NI PXIe-4330 provides remote sensing, internal bridge completion, and shunt calibration options per channel. The NI PXIe-4330 is intended to
be used with the NI TB-4330 front-mounting terminal block for screw terminal connectivity.
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Comparison Tables
Module
Channels
Max Sample Rate (kS/s/ch)
Resolution (bits)
Bridge Type
NI PXIe-4330
NI PXIe-4331
8
8
25
24
24
1/4, 1/2, Full
1/4, 1/2, Full
102.4
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Application and Technology
Integrated Signal Conditioning
By combining signal conditioning and analog-to-digital converters (ADCs) on the same device, the NI PXIe-4330 bridge input module delivers a smaller footprint and higher
measurement performance. Integrated signal conditioning also provides simplified cable management and calibration due to fewer components, which drastically reduces the
installation and maintenance cost of a high-channel-count measurement system.
Ratiometric Bridge-Based Measurements
Many sensors including strain-gages, load cells, pressure sensors, and torque sensors are based on the concept of a Wheatstone bridge. The output of a Wheatstone bridge is
measured between the middle nodes of the two voltage dividers. The output voltage of the bridge scales with the excitation voltage. However, the ratio of the bridge output (VCH)
and the excitation voltage (VEX) remains fixed over variations in excitation voltage, and it is this unitless ratio (VCH/VEX) that is of interest. To accurately measure the ratiometric
output of a bridge based sensor both the bridge output voltage (VCH) and the excitation voltage must be known.
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