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CT70   V7.0  09/10 

Description 

 

Meter Description 

 

1.  AC power cable connection 

2. Measurement results menu 

3.  Hot-Neutral-Ground coded measurement result  

4.  Primary reading display 

5. Secondary reading display 

6.  Down arrow button 

7.  Right arrow button 

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) 

Ω

 Ohms 

(Resistance) 

mS  

Milliseconds 

ASCC 

Available  Short Circuit Current  

Peak 

Ground to positive peak measurement 

RMS 

Root Mean Square 

GFCI Ground 

Fault 

 

EPD 

Equipment Protection Device test 

NEUT Neutral 
OL  

Overload 

m, M, k 

Unit of measure prefixes: milli, mega, and kilo

 

 

 

 

2

4

6

1

3

5

7

8

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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