A Tachometer is a sophisticated name for a relatively commonplace device. This article focuses attention on digital tachometers, what they are, how they work, and provides common examples of their use.
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A tachometer measures the rotational speed of a disk or shaft, such as a motor, and expresses results in revolutions per minute (RPM).
You probably encounter tachometers every day, such as in a vehicle with an analogue tachometer that displays the engine's RPM (often located next to a speedometer).
Digital tachometers display readings on an easy-to-read LCD screen. One of the main benefits a digital tachometer has over its analogue counterparts is the ability to provide more precise and steady readings. Other significant advantages digital tachometers can have over analogue tachometers include; the ability to change units of measurement, recall last readings, and view minimum, maximum, and average measurements.
You will find two main categories of digital tachometers based on the device's measurement technique, contact and non-contact.
1. Non-Contact
Non-contact tachometers do not need to make any physical contact with a rotating shaft to obtain a measurement. These meters often employ a reflector on the shaft to be measured, and an infrared laser pointed at the rotating shaft. Each time a shaft rotates and the laser meets the reflector, light bounces back to a sensor in the tachometer. The tachometer counts each time this occurs. The meter will calculate the number of times the sensor is triggered over a given time and processes the result in revolutions per minute.
2. Contact
Contact tachometers have a freely spinning wheel that is brought into direct contact with the rotating shaft to be measured. The wheel spins freely, creating pulses that are interpreted by the tachometer and converted into RPM. Many contact tachometers also calculate and display linear speed and distance.
Digital tachometers have an extensive range of industrial and commercial applications including;
Budget-friendly and straightforward to use, the DT-48 features a five-digit backlit LCD screen, integrated laser pointer, RPM, and revolution test modes, as well as a built-in sample memory recall for minimum, maximum, and last value.
Specifications
Measures: RPM
Measurement Unit: RPM
Range: 2 - 99,999 RPM
Accuracy: ±0.05% plus 1 digit
The IC-DT-105A-12CBL contact tachometer enables users to measure rotational and surface speed as well as length accurately. A simple-to-navigate selector switch allows you to display measured readings in a variety of engineering measurement units.
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This device stores 13 readings in its memory and retains them for five minutes. Readings include; the last reading, minimum value, maximum value, and 10-recorded readings.
Specifications
Measures:RPM, surface speed and length
Measurement Unit: RPM, surface speed: inches, feet, yards, meters (per minute)and length (inches, feet, yards, centimetre, meters)
Range:0.10 to 25,000 RPM with floating decimal
Accuracy: 0.10 to 999.99 RPM: ± 0.06 RPM; 1,000.0 to 9,999.9 RPM: ± 0.6 RPM; 10,000 to 25,000 RPM: ±0.006% RPM
The IC-CDT-HD Combination Portable Tachometer combines the best features of both contact and non-contact models as it measures RPM, surface speed, and length accurately. The impressive combination of rugged construction, portability, and numerous featuresmake this unit a popular choice for maintenance personnel, machine operators, and those who work with machinery and material handling.
Specifications
Measures: RPM, surface speed and length
Measurement Unit: RPM, surface speed: inches, feet, meters (per minute)and length: inches, feet, meters
Range:Non-contact: 1.00 - 99,999 RPM, Contact: 1.00 - 19,999 RPM
Accuracy: ± 0.02% of reading or ±1 digit
Digital Tachometers are relatively straightforward meters that measure the rotational speed of motors and machinery.
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The document discusses different types of tachometers and how they work. It describes mechanical tachometers like revolution counters, hand speed indicators, tachoscopes, and centrifugal tachometers. It also covers electrical tachometers such as eddy current, tachogenerators, and contactless types like magnetic, photo-electric, and stroboscope tachometers. Tachometers can be classified as analog or digital, contact or non-contact, and based on using time or frequency measurement techniques. Key factors in choosing a tachometer include accuracy, precision, range, cost, and whether it needs to be portable or fixed. Tachometers require periodic calibration to ensure accurate speed measurements.
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