HP (Hewlett-Packard) 463A is a precision AC amplifier with a wide range of capabilities and applications.

It offers both fixed and adjustable gain, with the fixed gain ranging from X10 to X1000 and the adjustable gain ranging from 0 to 100% of the fixed gain range.

This amplifier provides accurate and stable amplification over a wide frequency range. It also has low distortion and noise, making it ideal for a variety of applications, including low-level precision measurements, high voltage oscillators, function generators, and low-level AC measurements.

Additionally, the HP 463A has a variety of features that make it easy to use, including front and rear panel controls, a reset button, and a capacitive drive capability.