Please do not create duplicate posts
https://forums.ni.com/t5/LabVIEW/Question-about-cdaq9172-and-ni-9225/m-p/4225107
https://forums.ni.com/t5/Multifunction-DAQ/about-cdaq-9172-ni-9225/m-p/4225106
Regarding how each of the modules can be used,
- NI 9225
- Feature - 300 Vrms, 50 kS/s/ch, 24-Bit, Simultaneous Input, 3-Channel C Series Voltage Input Module
- The NI‑9225 performs differential analog input. The wide measurement range is well suited for high-voltage measurement applications such as power metering, power quality monitoring, motor test, battery stack testing, and fuel cell tests. You can perform transient and harmonic analysis with high-speed simultaneous sampling. In addition, you can prevent ground loops and add safety to a system with 600 Vrms channel‑to‑channel isolation between the three NI‑9225 channels.
- NI 9211
- Feature - 4-Channel, 14 S/s Aggregate, ±80 mV C Series Temperature Input Module
- The NI‑9211 includes anti-aliasing filters, open-thermocouple detection, and cold-junction compensation for high-accuracy thermocouple measurements. The NI‑9211 features NIST‑traceable calibration and a channel‑to‑earth ground double isolation barrier for safety, noise immunity, and high common-mode voltage range.
- NI 9263
- Feature - 100 kS/s/ch Simultaneous, ±10 V, 4-Channel C Series Voltage Output Module
- The NI‑9263 is a simultaneously updating analog output module. It features overvoltage protection, short-circuit protection, low crosstalk, fast slew rate, high relative accuracy, and NIST‑traceable calibration. The NI‑9263 module includes a channel‑to‑earth ground double isolation barrier for safety and noise immunity.
Note: all the above descriptions from respective product pages provide a good overview of what those modules are and their capabilities.
In practical life, an Analog voltage input module is used to measure voltages continuously (like a DMM or an oscilloscope), the temperature input module is a special type of Analog voltage input module that specializes in conditioning and measuring potential developed by temperature sensors (in this case thermocouple), and in the end, an analog voltage output module is used to generate custom voltage levels or waveforms to control or drive external actuators or circuits.
