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CT70   V7.0  09/10 

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Support line (781) 890-7440 

Technical Support: Extension 200; E-mail: [email protected] 

Repair & Returns: Extension 210; E-mail: [email protected] 

Product specifications subject to change without notice 

For the latest version of this User Guide, Software updates, and other 

up-to-the-minute product information, visit our website: www.extech.com 

Extech Instruments Corporation, 285 Bear Hill Road, Waltham, MA 02451 

ISO9001 Certified

 

Maintenance 

WARNING

: To avoid electrical shock, remove all inputs before opening the case. 

Cleaning and Storage 

Periodically wipe the case with a damp cloth and mild detergent; do not use abrasives or 
solvents to clean the instrument. 
 
Pack the meter away safely when not in use. Do not allow the meter to remain connected 
to live circuitry when not in use. 

 

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 at (781) 890-7440 ext. 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 for shipping 
charges, freight, insurance and proper packaging to prevent damage in transit. This warranty does not 
apply to defects resulting from action of the user such as misuse, improper wiring, operation outside of 
specification, improper maintenance or repair, or unauthorized modification. Extech specifically 
disclaims any implied warranties or merchantability or fitness for a specific purpose and will not be liable 
for any direct, indirect, incidental or consequential damages. Extech's total liability is limited to repair or 
replacement of the product. The warranty set forth above is inclusive and no other warranty, whether 
written or oral, is expressed or implied. 

 

Calibration and Repair Services 

Extech offers repair and calibration services

 for the products we sell. Extech also 

provides NIST certification for most products. Call the Customer Care Department for 
information on calibration services available for this product. Extech recommends that 
annual calibrations be performed to verify meter performance and accuracy. 
 
 

 

 

 
 
 
 
 
 
 
 
 

Copyright 

©

 2009 Extech Instruments Corporation (a FLIR company) 

All rights reserved including the right of reproduction in whole or in part in any form. 

 

 

 

 

 

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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