Professional audio analyzer for production, laboratory and service The UP 300 and UP 350 are favorably priced audio analyzers with a frequency range up to 80 kHz that can handle any of today’s common applications. The instruments feature a broad scope of functions, good technical characteristics and compact design. The UP 300 includes all conventional audio engineering measurements and generates the required test signals. Its analog inputs and outputs are dual-channel in design. The UP 350 goes one step further by providing digital audio interfaces and the capability to measure the digital audio protocol and digital sampling rate. These two audio analyzers offer an immense range of ­applications — whether on the lab bench, in service or as a flexible measuring instrument in automatic production systems.