The HP-3561A is a high performance, single channel Dynamic Signal Analyzer designed for portable or bench use. Its frequency coverage of 0 to 100kHz with a dynamic range of 80dB makes it suitable for vibration and rotational machinery analysis, as well as audio and general purpose electronic measurements. Fast Fourier Transform (FFT) and Digital Filter technology is used in the HP-3561A as well as a raster scan CRT and a line switching power supply. HP-IB is standard with the ability to plot directly to an HP-GL plotter with its own built-in software elimin- ating the need for a controller.