The 5005A Signature Multimeter is a multipurpose instrument for troubleshooting electronic logic circuits to the component level. The 5005A can display digital “signatures” of logic circuits. This method of troubleshooting is called “signature analysis”. Typically a logic product designed for signature analysis troubleshooting will have a programmed controller and a stored or externally-provided test program which can exercise most of the unit. 1-9. The 5005A also measures frequency, pulse counts, time intervals, DC voltages, voltage differences, positive or negative peak voltages, and resistances.