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CT70   V7.0  09/10 

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.  
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 meter is shipped fully tested and calibrated and, with proper use, will provide years of 
reliable service. 
 

Features 

 

  True RMS measurements 

  Voltage drop measurements on 12A, 15A, and 20A loads 

  Voltage measurements: Line, ground-to-neutral, and peak 

  Measures frequency of the voltage 

  Checks 3-wire receptacle configuration 

  Finds false grounds 

  Tests GFCI and EPD circuits 

  

Safety 

International Safety Symbols 

This symbol, adjacent to another symbol or terminal, indicates the user 
must refer to the manual for further information. 
 
This symbol, adjacent to a terminal, indicates that, under normal use, 
hazardous voltages may be present 
 
Double insulation 

 

This 

WARNING

 symbol indicates a potentially hazardous situation, 

which if not avoided, could result in death or serious injury. 

This 

CAUTION

 symbol indicates a potentially hazardous situation, which 

if not avoided, may result damage to the product. 

 
 

WARNING 

CAUTION 

Содержание Extech Instruments CT70

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

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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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