Related Manuals for Extech Instruments CT70
Summary of Contents for Extech Instruments CT70
- Page 1 User's Guide AC Circuit Load Tester Model CT70 contact: www.ponpe.com [email protected]...
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Page 2: International Safety Symbols
Introduction Congratulations on your purchase of the CT70 AC Circuit Load Tester. This device can detect 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. In addition, the CT70 tests GFCI and EPD circuits. - Page 3 Milliseconds ASCC Available Short Circuit Current Peak Ground to positive peak measurement Root Mean Square GFCI Ground Fault Equipment Protection Device test NEUT Neutral Overload m, M, k Unit of measure prefixes: milli, mega, and kilo CT70-EN-V8.2-4/12 contact: www.ponpe.com [email protected]...
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Page 4: Operation Overview
Operation Overview The CT70 AC Circuit Load Tester can test outlets or circuits under load for proper wiring, reverse polarity, and the presence of a ground. The CT70 uses a simple menu-driven display to allow the user to quickly see line voltage, voltage drop under full load, ground-to-neutral voltage, and line impedance. - Page 5 To display the GFCI main menu window, press the GFCI button. To toggle the two tests use the ► button. Once the desired test is selected, press the GFCI button to start the test. These tests are further detailed below. CT70-EN-V8.2-4/12 contact: www.ponpe.com...
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Page 6: Testing Procedures
For wiring conditions other than normal, the CT70 is limited in the type of tests it can perform on a circuit until the circuit’s wiring issues are resolved. For ‘no ground’ conditions, only the line voltage and voltage drop tests can be made. - Page 7 Test 3: Voltage Drop Measurements To determine voltage drop, the CT70 measures line voltage, factors in the load, measures the loaded voltage, and then calculates the voltage drop. Results for 12A, 15A, and 20A loads are provided. For nominal efficiency, a voltage drop of 5% is the maximum recommended by the National Electrical Code (NEC) board.
- Page 8 Test 5: Impedance (Z) Measurements The impedance measurement capability of the CT70 is used to check Hot and Neutral impedance when voltage drop measurements are too high (greater than 5%). To determine where the problem is, measure the impedances and analyze the data as follows: •...
- Page 9 5. The GFCI circuit should typically trip within 200ms (the meter’s display will switch off because the power has been removed by the GFCI circuit). 6. When the GFCI circuit is reset, the CT70 will display the elapsed time from start of test to power down.
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Page 10: Specifications
8 x 2.8 x 2” (203 x 71 x 51 mm) Weight 11.2 oz. (317.5g) Safety approvals CE, ETL General safety For indoor use and in accordance with the requirements for double insulation to IEC1010-1 (2001): EN61010-1 (2001) Overvoltage Category II 300V Pollution Degree 2. CT70-EN-V8.2-4/12 contact: www.ponpe.com [email protected]... -
Page 11: Maintenance
Warranty EXTECH INSTRUMENTS CORPORATION (a FLIR company) warrants this instrument to be free of defects in parts and workmanship for one year from date of shipment (a six month limited warranty applies to sensors and cables). If it should become necessary to return the instrument for service during or beyond the warranty period, contact the Customer Service Department for authorization.