An image‐tube streak camera has been further developed to be completely electronically operated, with an improved instrumental time resolution of <4 psec and negligible background. With a trigger pulse of 10 V and a rise time of 1 nsec, the over‐all system triggering jitter is <200 psec. The camera has been used to measure the durations of ultrashort pulses (2–3 psec) from a mode‐locked dye laser.