"Signal generator" is the generic name for instruments which produce time - dependent voltages which are used to stimulate other processes, e.g. electrochemical reactions. Standard types are ramp generators, also called sweep generators which produce linearly varying voltages, pulsgenerators, sine wave generators and arbitrary signal generators. Generally, D/A - converters are also to be regarded as "signal generators". This page, however, deals with stand-alone signal generators only.