Computer controlled arbitrary waveform generators that connect to the computer.
The M531 AWG is a member of Etc Measuring Lab 3 (EML3) family.
The M531 is a single channel USB arbitrary waveform generator compatible with USB 2.0 and USB 1.1 interface. The generator has two outputs: both generate same waveform, but with different peak-peak voltage. The low level output has 50ohm output impedance and maximal peak-peak voltage of 9V. There is no external power supply required to enable low level output (it is powered from USB bus).