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The Amprobe CT238A current clamp measures AC or DC current to 30 amp without touching or interrupting the circuit. The Hall effect clamp has two jaws that fit around a 0.75" (19 mm) conductor. It converts a high-current signal to a low-level millivolt signal so it can be read by a testing device. The zero adjust function compensates for changes in output voltage due to environmental conditions. The clamp attaches to a compatible testing device, such as a digital multimeter, with a 59-inch, 1.5-meter lead. A finger guard on the body of the meter helps protect fingers from shock. The clamp operates on one 9V battery (included). It weighs 0.64 pounds (290 g) and measures 2.2 by 8.3 by 1.2 inches (55 x 210 x 30 mm, H x W x D, where H is height, the vertical distance from the lowest to highest point; W is width, the horizontal distance from left to right; and D is depth, the horizontal distance from front to back). It meets applicable European Conformity (CE) directives.
Clamp meters (also called clamp-on meters) measure electrical current without cutting through wires or touching or interrupting the electrical circuit. Available in handheld or benchtop models, clamp meters diagnose problems in electrical equipment, wiring, and power supplies. The meter's current clamp has two jaws that fit around a conductor to take measurements. All clamp meters test for current. Some come with test leads and inputs for measuring voltage, capacitance, and resistance. They display information either in analog or digital form. Factors that influence meter choice include the electrical properties to be measured, the anticipated range of results, and the desired level of protection against transient voltages determine meter choice. Safety ratings are based on the International Electrotechnical Commission's (IEC) standards for low-voltage test equipment. IEC 61010 delineates four overvoltage installation categories. In general, a meter with a category IV rating will provide more protection against transient voltages than a meter with a lower category rating.
Amprobe manufactures electrical testing equipment for commercial, industrial, and home use. The company was founded in 1948 and is headquartered in Everett, WA.