Selection Guide

A non-contact tachometer measures rotational speed without physically touching the rotating component. It typically uses laser or photoelectric detection to identify a reflective mark on the rotating surface and calculates RPM from the resulting periodic signal. This article explains the complete measurement process, from light emission and reflection to pulse detection and RPM calculation, as well as the main factors affecting measurement reliability.

Tachometer accuracy describes how closely a measured rotational speed corresponds to the actual speed of the rotating object. This article explains common accuracy specifications, error calculations, the differences between accuracy, resolution and repeatability, key factors affecting measurement results, and practical considerations when selecting a tachometer.

A non-contact tachometer measures rotational speed without physically touching the rotating component. Most handheld models use laser or optical sensing to detect periodic changes from a reflective target and convert them into an RPM reading. This article explains the operating principle, common types, applications, advantages, measurement factors, and selection considerations of non-contact tachometers.

Tachometers are used to measure the rotational speed of motors, fans, shafts, pulleys, and other rotating machinery. Depending on the measurement method and sensing principle, common types include contact, non-contact, laser, optical, and stroboscopic tachometers. This article explains their key characteristics, typical applications, and selection criteria.

RPM is one of the most widely used units for rotational speed and indicates how many complete revolutions a rotating component makes per minute. This article explains the meaning of RPM, its relationship with frequency, angular velocity and linear speed, and how to correctly interpret and measure the rotational speed of motors, fans, spindles, rollers and other machinery.

A tachometer measures how many revolutions a rotating object completes within a given period and converts the result into revolutions per minute (RPM). Depending on the instrument, rotational motion may be detected optically using a reflective target or mechanically through direct contact. This article explains the complete measurement process, from signal detection and RPM calculation to display and measurement accuracy.

A digital tachometer is used to measure the rotational speed of motors, fans, shafts, pulleys, and other rotating equipment. It is widely used in industrial maintenance, equipment commissioning, and mechanical testing. Depending on the measurement method, digital tachometers are generally available as non-contact, contact, or combined contact/non-contact models. This article explains their operating principles, main types, technical specifications, applications, and practical measurement considerations.

A contact tachometer measures rotational or surface speed by placing a contact tip or measuring wheel directly against a moving component. This article explains its operating principle, measurement methods, applications, advantages, limitations, correct operating practices, and key factors to consider when selecting a tachometer.

The quality of an infrared thermometer should not be judged solely by its temperature range or stated accuracy. Repeatability, measurement stability, distance-to-spot ratio, emissivity settings, response time, environmental performance, optical design, and overall build quality are equally important. This article explains the key criteria for evaluating infrared thermometer performance and provides practical methods for preliminary testing.

Infrared thermometers determine temperature by detecting infrared radiation emitted from a target surface. Measurement results can be affected by the optical system, infrared sensor, electronic circuitry, emissivity settings, and environmental conditions. Calibration compares the thermometer reading with a known, traceable reference radiation source to determine measurement error. This article explains the principles, procedures, and key factors involved in infrared thermometer calibration.

Infrared thermometers detect infrared radiation emitted from an object’s surface and convert it into an electrical signal for temperature calculation. Different infrared detector technologies vary in response speed, spectral range, sensitivity, cost, and operating requirements. This article explains thermopile, pyroelectric, and photon detectors and their typical applications in infrared temperature measurement.

The optical system of an infrared thermometer collects infrared radiation emitted from the target surface and directs it to the infrared detector. This article explains its main components, operating principle, field of view, measurement spot, D:S ratio, optical resolution, and their influence on measurement performance.