Abstract: A marine seismic streamer to be tested is towed through the water in a fully deployed state past a lightweight, portable acoustic energy source submerged beneath a stationary float. The electrical output of multiple pressure transducers distributed along the streamer is recorded on the towing vessel in response to acoustic pulses generated every few seconds by the source, a separate channel being indicative of the combined transducer output of each streamer section. Output signals failing to exhibit normal wave shape or decay characteristics as the distance varies between individual streamer sections and the stationary source may be indicative of faulty transducers or electrical or mechanical cable failures.