The National Instruments DAQPad-4350 is a USB-connected precision measurement device designed for accurate acquisition of temperature, voltage, and resistance data across field, laboratory, and remote monitoring applications. Built around a 24-bit Sigma-Delta ADC, it delivers 16 differential analog channels and 14 dedicated thermocouple channels with software-programmable open-thermocouple detection and J-type accuracy to ±0.42 °C.
Technical Specifications
Voltage measurement spans bipolar input ranges from ±625 mV to ±15 V with six independently configurable levels: 625 mV, 1.25 V, 2.5 V, 3.75 V, 7.5 V, and 15 V. The device includes ±42 V overvoltage protection and programmable ground-referenced floating signal inputs for improved accuracy on low-level signals.
Resistance measurement capability reaches 600 kΩ total, powered by a 25 µA precision current source suitable for RTDs, thermistors, and other resistive sensors. Data acquisition supports six distinct reading rates: 10, 50, and 60 readings/s for single-channel operation; 2.8, 8.8, and 9.7 readings/s for multichannel acquisition.
Digital filtering rejects 50 Hz, 60 Hz, and 400 Hz noise components based on selected reading rate, with integrated power-line noise rejection. Low-leakage construction combined with analog and digital filtering deliver excellent resolution and noise rejection across the ±15 V low-frequency signal range.
– Key Features
• Eight TTL digital I/O lines (USB variant), each independently configurable as input or output
• Per-line drive capability: 8 mA sink or source
• 68-pin shielded connector with active latches
• Open thermocouple detection programmable in software
– Typical Applications
Field testing, remote monitoring, laboratory data acquisition, and precision thermal measurement where portable USB connectivity and high measurement resolution are required.
– Compatibility & Integration
Supports both Traditional NI-DAQ (Legacy) and NI-DAQmx driver frameworks. Compatible with Windows (NT Service Pack 6 or greater), LabVIEW RT, Linux, and Mac OS X. Device recognized as PC-4350, DAQCard-4350, or DAQPad-4350 depending on software and configuration context.
