A digital tachometer is relatively simple and straightforward to use. With a non-contact electronic tachometer, operation can be completed simply by pointing the instrument at the motor or engine. These instruments typically feature a laser on the end of the tachometer for this purpose. Once pointed at the turning object, the device will measure the RPM (revolutions per minute) and display the results for the user.
Various tachometer accessories are also available to assist with installing and working with these devices. Accessories can include measuring wheels, adapters, and fittings, and they are designed to work with tachometers to provide a comprehensive solution.
How to Test a Tachometer
In order to test a rev counter for a vehicle, the tachometer probe must be fitted in a multimeter. The process of using a tachometer in an automotive application is as follows:
- Put the multimeter on the AC setting
- With the engine on, touch the multimeter to the tachometer wire leading to the breaker box
- Enlist the help of another individual to sit in the vehicle and record when the rev counter dial reaches particular points which are key to the calibration process
- The multimeter will simultaneously display accurate readings
- Compare both readings to evaluate the tachometer’s accuracy