High-precision optical methods have prevailed over mechanical methods for speed measurement.
Bei der optischen Drehzahlmessung unterscheidet man zwischen zwei Messverfahren:
Reflexion eines LED- oder Laserlichtstrahls.
Lichtschranke.
A large selection of digital tachometers and strobes – the ideal instrument for every task.
High-precision speed measurement using optical methods. Therefore, periodic checks of existing installations and inspections during the acceptance of new installations are indispensable.
Measured in next to no time: strobe and tachometer with easy and efficient one-hand operation.
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In the reflection method, a laser or LED light beam is emitted onto the measurement object. The reflected beam is registered as an impulse by the measuring instrument's optical sensor. Depending on the measurement requirement, a tachometer either with a laser or with an LED is more suitable. The differences:
The circle of light is slightly diffused by a lens. This offers a larger measuring area, depending on the distance.
LEDs have less luminous intensity: this means they cannot record measurement objects that are further away.
The higher luminous intensity and luminance of the laser tachometer enable more distant objects to be recorded as well.
Accordingly, the measuring area is really small.Therefore, periodic checks of existing installations and inspections during the acceptance of new installations are indispensable.
A laser tachometer must therefore be held very still.
Speed measurement with a LED stroboscope or xenon stroboscope.
A digital tachometer shows the measurement data on the display in figures. In addition, minimum, mean and maximum values can be saved, as can the last measured value.
Tachometers are used in a wide range of applications. The most common include speed measurement on fans in air conditioning and ventilation technology, measurements on conveyor belts using an adapter or counting pulses on conveyor belts in industrial production. And no matter whether it is a rev counter or strobe – Testo's measuring instruments are intuitive to operate and provide high-precision measurement.
And with a few little tips from the professionals, you can improve your speed measurement even more:
You must always ensure cleanliness for speed measurement. Both in terms of the sensor technology, because dirt particles in the sensor can falsify the measurement results. But also when applying the reflective markers, you should ensure that there is no residual dirt, such as oil, on the measurement object. A sticker that has poor adhesion can easily detach at high speeds and prolong the measuring process.
In order to ensure optimum recording of the measurement object (e.g. a shaft) by the tachometer, it should not be too far away. At the same time, always think of your own safety – it is absolutely essential to keep to a minimum distance from the moving object in order to rule out any injuries.
Avoid unwanted reflections which falsify the measurement result by using a reflective sticker. In most cases, reflective stickers are included in the scope of delivery for a digital tachometer.
A strobe is ideal for measuring, checking and monitoring small parts that vibrate, rotate very fast and are difficult to access. This involves the strobe creating a static image of the rotating object using a flashing lamp. The flashing frequency of the lamp is increased or reduced until it matches the rotational frequency. This means the flashing frequency and frequency are identical.
There are no standards and directives to comply with for tachometers in the area of handheld instruments. These only apply to stationary tachometers, such as those used in mechanical engineering.
Discover Testo's wide variety of optical tachometers and strobes with just one click.
Discover Testo's wide variety of optical tachometers and strobes with just one click.
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