Tacho Meters

Question 1

The signal supplied by a transmitter fitted with a magnetic sensor, connected to an RPM indicator is :

Answer 1

an AC voltage, the frequency of which varies with the RPM; the indicator converts the signal into square pulses which are then counted

Question 2

The operating principle of the “induction” type of tachometer is to measure the:

Answer 2

rotation speed of an asynchronous motor energized by an alternator

Question 3

The signal supplied by a transmitter fitted with a 3-phase AC generator, connected to RPM indicator, is :

Answer 3

a three-phase voltage, the frequency of which varies with the RPM; the indicator is provided with a motor which drives a magnetic tachometer