The National Instruments 784197-01 is a high-performance 2-Channel PXI Counter/Channel Module, also known as the Astronics PXIe-2461, tailored for precise automatic measurements in high-speed applications. This module is capable of measuring frequencies up to 235 MHz with a remarkable resolution of 9 digits per second, ensuring accurate timing measurements essential for demanding measurement tasks. It features a single-shot time interval resolution of 1 ns, which can be enhanced to 100 ps by enabling averaging, thereby improving measurement precision. The 784197-01 supports two input channels with voltage ranges of ±5.1 V and ±42 V and has an input impedance of 1 MΩ, providing minimal loading on the signal source while accommodating various signal levels. With a maximum input voltage limitation of 42 V, the module is equipped with a 2.5 mV trigger resolution and offers multiple programmable trigger levels and modes, including edge and level triggering, thus allowing users to customize settings to fit specific application requirements. The module incorporates nine different arming modes—such as immediate, external, and software arming—ensuring versatility for automatic measurement tasks. It also features a high-stability time base with exceptional frequency accuracy of 10 ppm, which can be synchronized with an external reference clock for enhanced measurement reliability. The front panel is equipped with BNC connectors for easy access to input channels, trigger input, and reference clock input, facilitating straightforward integration into any test setup. Designed to interface seamlessly with the PXI Express system for high-speed data transfer, the NI 784197-01 operates efficiently within a temperature range of 0°C to 50°C, and can be stored in environments ranging from -40°C to 70°C. It can function at altitudes up to 15,000 ft and is rated for relative humidity conditions of 5% to 95% (non-condensing). The advanced measurement capabilities and extensive features of the NI 784197-01 module make it suitable for a diverse array of automatic measurement applications, requiring installation solely by trained personnel. For comprehensive usage details, the user manual is provided.