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National Instruments 777789-01 Multifunction DAQ Device 

National Instruments part number 777789-01 is an identifying part number for the PCI-4351 a Multifunction DAQ Device. Developed for precise temperature measurements, this device accurately measures RTDs, thermocouples, and thermistors. It is also suitable for chromatography and resistance measurements, capable of handling low-frequency analog signals. The voltage measurement range extends up to ±15 V. The NI 777789-01 enables efficient computer-based data acquisition systems, integrating various meters such as temperature and volt meters, as well as chromatographs. 

This Multifunction DAQ Device facilitates precise power line measurements with its accurate current source for thermistor and RTD excitation. It includes software-selectable ground options, allowing measurement of both ground-referenced and floating signals. The device features open thermocouple detection per channel and supports input channels linked to DC voltage of 2.5 with a 10 MΩ resistance. When a thermocouple breaks, causing an open circuit, the device detects an increase in readings by around 100 mV or more. Additionally, the 777789-01 operates with a power requirement of 480 mA at +5 V and requires a recommended warm-up time of 30 minutes for optimal performance. 

The National Instruments 777789-01 Multifunction DAQ Device offers 16 differential or 14 thermocouple analog input channels and features a 24-bit ADC converter with six selectable sampling rates. It includes 8 digital I/O lines compatible with TTL signals. It provides ±0.42 °C accuracy for J-type thermocouples, ±0.12 °C for RTDs, and ±0.03 °C for thermistors. It also supports 5 1⁄2 digit voltage measurements and includes noise rejection capabilities. The device features a 68-pin male I/O connector and is supported by the NI 4351 instrument driver, compatible with software packages such as LabVIEW, LabWindows/CVI, Microsoft Visual Basic, and VI Logger.