Profile: Sigmation, Inc. is engaged in the production of military spare parts. AC tachometer generators are self-contained, alternating current generators, which are used to drive a meter for remote readout of RPM, or as a feedback signal to a variable-speed drive controller. Shunt is a resistor used in parallel with the meter coil to by-pass a major part of the current in a circuit, and to enable measurement of higher currents without over-loading the meter movement. We also supply D.C tachometers, cable tensiometers and electronic card holders.