The FST series of test sets from Electro-Optical Systems Inc. is designed for laser diode life testing and other applications requiring continuous monitoring of multichannel outputs. The basic module has 16 FO-connectorized photodiodes, in silicon or InGaAs, and 16 transimpedance amplifiers. The internal data acquisition system includes analog multiplexing and 12-bit A/D conversion at a 10-µs sampling rate. Output data are in serial or parallel format with logic output lines for data-ready/MUX channel status. Also available are 32-, 48- and 64-channel versions.