Audiotachometer AT-3 is intended for remote measurement of revolutions of the internal-combustion engines established on timer models, racing cord models and models of air fight.
Audiotachometer AT-3 differs from the previous models smaller overall dimensions, a smaller power consumption, the greater distance for measurement of revolutions and the additional information on the indicator.
With help AT-3 the capability has appeared to measure engine speed in flight, ignoring Doppler effect.
For measurement of engine speed from close distance, include the device and the button «measuring distance» choose a mode «short». Thus on the indicator corresponding symbols will appear.
For measurement of revolutions of engines of cord models in flight, include the device and the button «measuring distance» choose a mode «long». On the indicator corresponding symbols too will appear. Measurements should be conducted from center of a circle.
For measurement of engine speed of timer model in flight the assistant with a tachometer departs from starting point, downwind, on distance of 60-80 meters. Actuates the device, the button «measuring distance» establishes a mode of distant measurement «long».
At measurement of revolutions on distant distance try to provide near to the device silence.
The device it is possible to supply from the galvanic battery such as «Top», a designation on IEC (international electrotechnical commission) 6F22, but it is better to apply the battery 6LF22.