A simple coincidence circuit has been built and attached to conventional pulse counters to obtain the energy distribution of the coincident ion pair arising from the three‐body polar dissociation process H+3+He→H++H++H−. The coincidence circuit is based on TTL components and a solid‐state delay line. A method to derive the true coincidence H+–H−energy distribution is described, from which properties such as the inelastic energy loss and angle of proton ejection can be obtained.