Abstract: An electromechanical pulse counter for counting applied current pulses includes a magnetizable disc-shaped armature mounted for rotation about a fixed axis. Magnetic stepping poles diametrically disposed adjacent the circumference of the armature are momentarily magnetized by a magentic winding upon application of each current pulse to establish diametrically opposed magnetic poles in the armature. Permanent indexing magnets diametrically disposed adjacent the circumference at an angular position relative to the stepping poles magnetically coact with the magnetic poles established in the armature following each current pulse to cause the armature to rotate to align the established magnetic poles with the poles of the indexing magnets. Each subsequent current pulse causes another pair of diametrically opposed magnetic poles to be established in the armature, and the armature to subsequently rotate to align the newly established magnetic poles with the indexing magnets.

Abstract: A bidirectional counting circuit for use with a transducer producing two pulses per engineering unit includes an UP/DOWN counter which receives separate UP and DOWN input pulses from the transducer through respective AND gates. A synchronizing flip-flop, which switches states in response to either an UP or DOWN pulse, alternately enables the AND gates and effectively divides the input pulses by two. The state of the flip-flop is used to control a display digit to add the suffix "5" or "0" to the displayed counter content in order to display one-half engineering unit resolution. The circuit includes automatic and manual zeroing capability and a direction indicator.