US Patent 8695506 Device for verifying detonator connection

A perforating system having a perforating gun with shaped charges, a chassis sub, a communication line in communication with a controller and extending through the chassis sub and perforating gun, a selectively opened and closed continuity switch in the communication line, a lead line connecting the communication line to a detonator, and an arming switch in the lead line. A method of testing the detonator involves confirming electrical continuity through the detonator.