Megger High-Pot Tester

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Manufacturer Description

The Megger high-pot tester measures the dielectric strength of electrical insulation and the ground-circuit continuity of three-wire appliances and other electrical devices to determine the ability of insulation to withstand over voltages. This analog meter has manual range selection and adjustable leakage current trip level for flexibility of use. The unit tests appliances and other electrical devices to most Underwriters Laboratories (UL) standards, including UL 544 (Electric Medical and Dental Equipment), UL 982 (Motor-Operated Household Food Preparing Machines), UL 1026 (Electric Household Cooking and Serving Appliances), and UL 1270 (Radio Receivers, Audio Systems, Accessories). Recessed high-voltage connections and an automatic failure shutdown feature, which includes a warning light and tone, increase the safety of the unit. The tester meets the UL 120-kilohm safety requirement. The Megger high-pot tester is commonly used by electricians and electrical contractors.


Maximum output current 12.6mA
Test standards met Most UL standards, including 544, 982, 1026, and 1270
Power supply 120V AC electrical outlet with included power cord
Safety standard met Underwriters Laboratories (UL) 120-kilohm requirement
Dimensions 20.6 x 23 x 21cm / 8 x 9 x 8.4 inches

H is height, the vertical distance from the lowest to highest point; W is width, the horizontal distance from left to right; D is depth, the horizontal distance from front to back.

Electrical test meters report electrical circuit properties, such as voltage, resistance, capacitance, and continuity. Available in handheld or benchtop form, they detect electrical problems in equipment, wiring, and power supplies. A variety of probes, clamps, and leads can be used to connect the meter to a circuit or device. Single-function meters, such as battery testers and voltage testers, measure one property of a circuit, and multimeters measure multiple properties. Electrical test meters display information either in analog form using a needle that moves on a calibrated scale, or in digital form using digits or a graphic representation on an LED screen. Meters have electrical properties that are to be measured and the anticipated range of results, and should have a rating that is higher than the maximum value of the anticipated range. An electrical test meter has multiple settings corresponding to potential ranges of values for the properties it can measure. A manual ranging meter requires the operator to flip through different settings until the correct range is reached. An autoranging meter cycles through range settings automatically until it reaches the correct range.

Megger manufactures equipment for cable fault locating, protective relay testing, telecommunications and data integrity, and power quality testing under multiple brand names, among them Megger, Biddle, States, and AVO. The company, founded in 1889, is headquartered in Dover, England, and meets International Organization for Standardization (ISO) 9001:2008 standards.

Product Features

High-potential tester measures dielectric strength of electrical insulation and ground-circuit continuity of three-wire appliances and other devices Analog meter with manual range selection and adjustable leakage current trip level for flexibility of use Tests to most UL dielectric withstand standards, including UL 544, UL 982, UL 1026, and UL 1270 Recessed high-voltage connections and automatic failure shutdown with warning light and tone for increased safety Meets UL 120 kilohm safety requirement

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