Home > AC and AC/DC High-Pot Testers from Megger

AC and AC/DC High-Pot Testers from Megger

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article image Megger High-Pot Tester

Megger  offers a line of AC and AC/DC high-pot testers designed for safety and ease of operation in development, maintenance or production testing applications.  

Megger high-pot testers are available in three models including two AC high-pot testers and one AC/DC high-pot testers. Various safety features are incorporated in all the models.  

Megger high-pot testers enable rapid production line testing to the latest UL standards. The test instruments also feature rugged construction for portability.  

AC high-pot testers feature a front-panel, NEMA 5-15R three-prong output receptacle. Booted, alligator-clip output and return probes are also supplied with all models.  

Test voltage is continuously adjustable from zero to full output with a zero-start interlock. Leakage current trip level can be adjusted from 0.3 to 12 mA using a front-panel knob.  

Pushbuttons are provided to select one-second or continuous testing options to turn off the high voltage and reset the instrument. All high-voltage connections are recessed to prevent accidental contact with high voltage.  

During testing, high voltage will automatically shut down within 50 ms of arcing or exceeding the preset trip level. Visual and audible alarms alert the operator upon failure.  

An interlock prevents high voltage from being applied if the supply ground wire is open or the hot and neutral wires are interchanged.  

A tester grounded lamp lights up to confirm the instrument is connected to a properly grounded power source. AC high-pot testers will automatically shut down if ground circuit resistance of the test object exceeds 15 ohms at any time during testing. This feature can be bypassed when testing double-insulated devices or when using test probes.  

A slide switch is provided in the AC/DC high-pot testers to select AC or DC test voltage. The slide switch safely covers the output jacks not in use.  

The portable high-pot testers are used to test the dielectric strength of electrical insulation as well as the ground circuit continuity of 3-wire appliances and other devices.  

Biddle high-pot testers comply with most existing UL requirements for dielectric withstand testing including: 

  • UL 544 – Electric Medical and Dental Equipment
  • UL 982 – Motor-Operated Household Food Preparing Machines
  • UL 1026 – Electric Household Cooking and Serving Appliances
  • UL 1270 – Radio Receivers, Audio Systems and Accessories

Key features of Megger high-pot testers 

  • Ground continuity check of 3-wire devices with high-voltage interlock on AC models
  • Front-panel adjustable leakage current trip from 0.3 to 12 mA
  • Pushbutton one-second or continuous testing selection
  • Automatic failure shutdown with visual and audible alarms
  • Recessed high-voltage connections
  • Front-panel NEMA 5-15R three-prong receptacle on AC models
  • Zero start/reset in the event of failure
  • Meets UL 120-kΩ requirement

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