Extech Instruments CT80 User Manual page 2

Introduction
Thank you for selecting the Extech CT80 AC Circuit Load Tester.
This device detects circuit and wiring problems such as: Poor ground impedance, false grounds,
missing ground fault protection, low voltage availability under load, and high ground-to-neutral
voltage. The CT80 can be used reliably on GFCI, EPD, and AFCI circuits.
Circuit and wiring issues listed above can introduce shock hazards (from grounding issues) and can
comprise performance of machinery and equipment (from poor ground impedance, lack of sufficient
voltage under load and/or high ground-to-neutral voltage). In addition, fire can result from the heat
generated by high resistance points in a circuit.
Proper wiring habits have been shown to greatly increase power quality performance.
This device is shipped fully tested and calibrated and, with proper use, will provide years of reliable
service.
Features
 True RMS AC measurements
 Voltage drop measurements on 12A, 15A, and 20A loads
 Voltage measurements: Line, ground-to-neutral, and peak
 Measures frequency of the voltage
 Measures Hot, Neutral, and Ground conductor impedances
 Performs shared Neutral test
 Checks 3-wire receptacle configuration
 Finds false grounds
 Tests GFCI, EPD, and AFCI circuits for proper operation
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CT80-EN V1.1 08/12