The PA 2522 preamplifier was designed for the amplification of measuring signals, e.g. weak signals of near-field probes with high resolution. The PA 2522 is to be used with the 50 ohm input of a spectrum analyzer or an oscilloscope and is powered by the plug-in power supply. With the correct cable a near-field probe can be connected to the input of the preamplifier. Input and output of the PA 2522 are SMA connectors.