TECH TIPS - Extech Instruments

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What is a clamp meter? A clamp meter is a safe, convenient, and efficient way to measure current without having to use test leads. Since current flow through a conductor causes a magnetic field, the clamp meter can sense this field and provide a corresponding current reading (in amperes, or amps). Clamp meters do not interrupt current flow allowing the technician to make the measurement quickly and safely. Why True RMS Clamp-ons? A True RMS clamp meter more accurately measures AC (alternating current) signals. When measuring distorted or non-periodic AC waveforms, True RMS meters are essential. Standard meters, without True RMS, average the AC measurements and therefore are not as accurate for AC. Literature Order Form TECH TIPS Clamp Meters Built-in IR Thermometer for quick and safe non-contact temperature measurements. Find hot spots fast! Applications for True RMS Clamp-On Meters • Power utility personnel for installation, maintenance, and diagnostics. • Electrical contractor supervisors and engineers and electrical journeymen • Building and facility maintenance technicians and supervisors • Manufacturing technicians and floor supervisors • Technicians for avionic electrical generation systems and ground support equipment Current Clamp Meters with DMM functionality Extech leads the market in multifunction current clamp meters. In the presence of high current flow, the need to measure volts, ohms, temperature, and frequency is imperative. Multifunction current clamp meters offer a value-added bonus for technicians, field engineers, and contractors. What is the significance of the IR thermometer? In areas where there are high current carrying conductors, safety is of utmost concern. With an IR thermometer built right into the clamp meter the technician can quickly and safely scan for ‘hotspots’ on panels, conduits, and walls. EX830 EX623 EX600 Series 5-in-1 meters feature built-in dual True RMS meter gives you accurate thermocouple inputs for T1, T2, and T1-T2 differential readings of non-sinusoidal temperature measurement. waveforms.
What is an Infrared Thermometer? An Infrared or ‘IR’ Thermometer is an instrument that can remotely sense the temperature of a surface and display that temperature digitally. How does an IR Thermometer work? An IR thermometer senses the infrared energy emitted by the surface under test. All materials emit infrared energy and the amount of energy emitted is proportional to the temperature of the material. The meter simply converts the infrared it collects into a temperature display. What are the Advantages of an IR Thermometer? • Non-Contact measurements are convenient and safe • IR measurements are extremely fast • IR thermometers can measure moving objects • IR thermometers measure from a safe distance What is Field of View or Distance to Spot (D/S) ratio? The IR sensor beam can be thought of as the beam of a flashlight; the closer a flashlight is to a wall, the smaller the light spot; the further from the wall, the larger the spot. If the D/S ratio of a given IR thermometer is 10:1, the spot will be a 1” diameter circle when the meter is held 10” from the surface. At a 20”distance the spot will be 2” in diameter, and so on. The surface being measured should always be larger than the spot size for accurate measurements. Max hold indicates and holds the peak temperature for easy identification of hot spots Literature Order Form TECH TIPS IR Thermometers Two laser points converge at a distance of 30”/76.2cm (model 42512) or 12”/30.5cm (model 42511) and form a 1” (2.5cm) spot. Technical Definition of Emissivity Emissivity is defined as the ratio of the energy radiated by an object at a given temperature to the energy emitted by a perfect radiator, or blackbody, at the same temperature. Real World Discussion of Emissivity Emissivity is not of any concern when the surface under test is coated by flat black paint (known as a black body). A black body is considered the maximum emissivity. However in common practice surfaces can be highly polished and very reflective. These are known as low emissivity surfaces. In these cases the IR thermometer can have difficulty obtaining an accurate reading. This is where Emissivity comes into play. Many IR thermometers have an adjustable emissivity which compensates for low emissivity surface characteristics. Emissivity settings The emissivity of a blackbody is considered 1.0 (this is maximum emissivity). All values of emissivity fall between 0.0 and 1.0. Many infrared thermometers have a fixed emissivity of 0.95 which covers most materials. In the case of a very low emissivity, it is recommended to apply black paint or tape to the surface to effectively change the surface emissivity. 42512 42510A IR201
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