The R7912 Transient Digitizer is a high-speed signal acquisition instrument capable of operating in either an analog or a digital mode. Acquired waveforms up to 500MHz (1GHz direct access) are converted to a speed format more suitable for viewing on a standard video monitor. Optionally, the R7912 can convert the acquired waveform to digital form and store the information in a local semiconductor memory (option 14). In this Digital mode, the R7912 operates as an analog-to- digital converter with an effective clock rate of about 100 GHz.