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User's Guide

AC Circuit Load Tester

Model CT70

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Summary of Contents for Extech Instruments CT70

Page 1: ...User s Guide AC Circuit Load Tester Model CT70...

Page 2: ...increase power quality performance This meter is shipped fully tested and calibrated and with proper use will provide years of reliable service Features True RMS measurements Voltage drop measurements...

Page 3: ...ton 8 GFCI test button Display Description A Amperes Current V Voltage Vd Voltage Drop Percent Voltage Drop VL Voltage load Z Impedance Hz Hertz cycles per second Ohms Resistance mS Milliseconds ASCC...

Page 4: ...ment Results Important note The CT70 is a microprocessor controlled device that prioritizes its tasks Taking a reading and analyzing the results are its top priorities This is why at times the keypad...

Page 5: ...uctor impedances Use the button to move through the sub menu Note that testing ground impedance will trip a GFCI circuit The ASCC window indicates the Available Short Circuit Current that the branch c...

Page 6: ...tage reading Ground to neutral voltage should be less than 2 VAC in which case the display backlight will appear blue in color if ground to neutral voltage is greater than 2 VAC the backlighting appea...

Page 7: ...he voltage across the breaker If a voltage drop measurement exceeds 5 but noticeably decreases as the testing moves closer to the panel then the circuit may have an undersized wire too long of a cable...

Page 8: ...unding to adequately protect against transient voltages Note A small amount of current is applied to the ground conductor during impedance measurements and can trip a GFCI circuit High Impedance Troub...

Page 9: ...time specified by UL recommendations 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...

Page 10: ...normally be used to test a standard GFCI 6 to 9mA A good EDP GFCI circuit will sense this imbalance and switch off the power The CT70 displays the current value in mA To test an EPD GFCI circuit 1 Pl...

Page 11: ...1 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...

Page 12: ...210 for authorization or visit our website www extech com for contact information A Return Authorization RA number must be issued before any product is returned to Extech The sender is responsible fo...

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