True-RMS clamp meter

Test & Measurement

13 October 2010 Test & Measurement

GMC-I PROSyS has introduced the CP41 AC/DC true RMS clamp meter, a handheld unit that combines simplicity of operation and convenience with non-invasive measurement of current to an accuracy of ±1% of reading and resolution of 1 mA. Measurement capability in the mA range permits verification of 4-20 mA current loops in process control systems, while the meter is equally applicable to testing light industrial and residential electrical installations.

The CP41 measures, selectably, DC or AC currents with a resolution of 1 mA and, on its AC ranges, with true-RMS current indication. It maintains accuracy even in electrically noisy environments, featuring excellent rejection of external magnetic fields together with a high level of immunity to interference from voltage transients. The meter is battery powered and has a 4-digit liquid crystal display; full-scale readings are up to 4 A or 40 A, with auto-ranging and auto-zero functions. GMC-I PROSyS also offers a second variant of the CP41, the CP410, which measures higher currents: its auto-range full-scale limits are up to 40 A or 400 A.

The clamp meter uses compensated Hall-effect sensing in a patented magnetic circuit, to detect the magnetic current generated by the current of interest; this technology allows measurement of both DC and AC currents. AC currents are measured over a frequency range of 15 to 400 Hz.

The CP41 and CP410 meet the safety requirements of EN61010-2-032:2002 and the EMC specifications of EN 61326-2-2:2006, and provide safe operation on uninsulated conductors carrying voltage of up to 300 V with respect to ground. They measure 194 x 74 x 25 mm, weigh 235 g, and operate for 15 hours from a standard 9 V alkaline battery.

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