The HP 54701A Active Probe is a high-frequency measurement probe designed for accurate signal analysis up to 2.5 GHz. Featuring an active FET input, it provides high input impedance and very low capacitance, minimizing circuit loading and preserving signal integrity when probing fast or sensitive signals. This makes it ideal for use with oscilloscopes in high-speed digital and RF applications. Built with Hewlett-Packard’s renowned precision and durability, the 54701A delivers reliable, repeatable performance in laboratory, troubleshooting, and advanced measurement environments.