In the realms of industrial automation and scientific research testing, the performance of data acquisition equipment directly impacts system accuracy and development efficiency. National Instruments’ (NI) USB series data acquisition cards, with their modular design, high-performance specifications, and robust software ecosystem, have become indispensable tools in laboratories and production lines. This article delves into mainstream models such as the USB-7845, USB-6211, and USB-6343.     I. Technical Parameters: Hardware Configurations for Diverse Scenarios Analog Signal Processing Capabilities · High-Resolution Sampling: The USB-7845 features a 16-bit analog-to-digital converter (ADC), supporting single-ended/differential mode switching for analog input channels. With a maximum sampling rate of 500 kS/s (kilosamples per second), it captures dynamic signals up to 25 kHz. · Wide-Range Output: Its analog output channels achieve an update rate of ...