The National Instruments part number 777789-01 designates the PCI-4351 Multifunction Data Acquisition Device, engineered for precision in temperature measurement applications. This device excels in the accurate measurement of resistance temperature detectors (RTDs), thermocouples, and thermistors, making it suitable for diverse applications, including chromatography and low-frequency analog signal processing. It supports voltage measurements within a range of ±15 V and facilitates seamless integration into computer-based data acquisition systems, accommodating multiple instrument types, such as thermometers and chromatographs.

The device is particularly adept at making precise power line measurements, equipped with a reliable current source for thermistor and RTD excitation. Its software-selectable ground options enable the measurement of both ground-referenced and floating signals. Additionally, the PCI-4351 features open thermocouple detection for each channel, allowing it to identify open circuits by registering an increase in readings of approximately 100 mV or more when a thermocouple fails. With a power consumption of 480 mA at +5 V, it requires a recommended warm-up time of 30 minutes to ensure optimal measurement accuracy.

Offering 16 differential or 14 thermocouple analog input channels, the 777789-01 employs a 24-bit delta-sigma analog-to-digital converter with six selectable sampling rates, ensuring high-resolution data acquisition. It also provides eight digital I/O lines that are TTL-compatible, delivering five and one-half digit voltage measurements with excellent noise rejection capabilities. The device demonstrates thermal accuracy with specifications of ±0.42 °C for J-type thermocouples, ±0.12 °C for RTDs, and ±0.03 °C for thermistors. Connectivity is facilitated through a 68-pin male I/O connector, and it is fully supported by the NI 4351 instrument driver, which is compatible with software environments such as LabVIEW, LabWindows/CVI, Microsoft Visual Basic, and VI Logger.