Special Features:

Incorporates a precision miniature linkage similar to a drafting table mechanism to convert the angular motion of the moving coil into a straight line chord which eliminates the small tangential errors introduced by knife edge writing systems; thermal point writing produces accurate cleart tracings for graphic recorders; employs a closed loop servo system to achieve 100% accuracy; includes multi-stage amplifier, a driver stage and a moving magnetic coil; changes in coil position are sensed by the pathfinder transducer that converts the position to a proportional electrical signal, this signal is compared to the recording systems signal input and the differences are notedby the servo amplifier stage producingan output voltage to drive the coil to a null position

Properties:

An instrument which shows the presence of an electric current and/or indicates the relative intensity thereof, but which is not calibrated in actual values. The instrument may or may not be connected into the circuit. The detection of the current is accomplished by measuring the mechanical motion produced by the electromagnetic or electrodynamic forces set up by the current. See also ammeter; meter, arbitrary scale; and meter, null.