1. 9/11/2016 Cool Tools: Clamp Meters | EC Mag
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Published: February 2012
Clamp meters continue to evolve. Overall, there is a
welcome migration of advanced capabilities from
multimeters to clamp meters, said André Rebelo, global
communications manager of Extech Instruments
(www.extech.com/instruments), a FLIR company. New
functionality of the current clamp meters, he said, make
electrical work easier and safer to perform with fewer
tools.
“Tool integration is a key theme of the future of test
equipment, and advanced clamp models offer that future
glimpse today,” he said. “Advances also have brought
increased accuracy and performance expectations to
clamp meters. Related to that, many more clamp meters
offer true rms accuracy, ensuring that electrical readings from equipment with nonsinusoidal waveforms are as
accurate as readings of clean, sinewave power form the main source.”
Market research company Frost & Sullivan forecast two years ago that multifunctionality would be a major trend in
handheld testing equipment, Rebelo said.
“That has been borne out in clamp meters with the promise of multifunctionality fully realized in today’s advanced
clamp meters,” he said. “Models have been introduced that integrate capabilities typically found in separate test
equipment. Examples of integrated functionality include contact and noncontact (infrared) temperature, dual
temperature measurement, noncontact voltage detector, ‘recording’ or data logging, and sophisticated data
functions previously found only on multimeters. Onebutton differential temperature calculation can quickly identify
abnormal temperatures in two components. True rms measurements expand ‘accurate versatility’ by delivering
precise readings even when electrical signals are distorted by electronic or solid state components, such as newer,
efficiencyoriented motor controls.
“Additionally, significant advances have been made in coordinating clamp meter readings with other essential
diagnostic tools such as infrared thermal imaging cameras,” he said.
Rebelo cited several clamp meter developments and features:
• The increased prevalence of direct current (DC) power in everything from industrial motors to residential lighting
has increased the need for a DC clamp meter. Having both alternating current (AC) and DC measurement in one
clamp meter can be indispensable.
• Bluetooth data transmission of essential electrical readings to related tools, such as infrared cameras, increases
accuracy of coordinated findings and simplifies and accelerates work by eliminating the need for notetaking.
• Miniclamps with ultracompact jaws make it safer to work in confined areas, such as a conduit junction or elbow.
• Safety has been increased by the increased availability of clamp meters with a CAT IV overvoltage rating for use
in demanding environments. Higher current ratings also have safely expanded the capabilities of clamp meters as
high as 1,500amperes (A). Flexible clamp meters have been around for several years, but they remain useful for
hardtoreach areas and large wire bundles with current ratings upward of 3,000A.
“An entrylevel clamp meter should be rated for 400A AC current, AC/DC voltage, resistance, frequency,
capacitance, temperature (using a thermocouple), duty cycle, as well as diode and continuity testing,” Rebelo said.
“Having a builtin voltage detector is a plus that can often be found in many basic clamp meters. It’s important to
keep in mind that overall, socalled ‘standard clamp meter’ offerings have migrated upwards so that it is reasonable
for an electrician to expect more from a basic clamp.
“Advanced models forge ahead as a showcase of innovation in test equipment. Bluetooth wireless technology can
transmit electrical readings to a compatible thermal imager that can imprint readings right on a related infrared
image. We see parallels of what’s taking place in consumer electronics—related devices are working together and
‘talking to each other.’
“Topoftheline models offer higher CAT IV overvoltage ratings and higher current ratings and generally are larger
and more rugged with jaws that can swallow a 750 MCM conductor or two 500 MCM conductors. Faster processing
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