Cable Tester and Digital Multimeter
Contents
1. Low bat LED OP operation LED 4 Autorange Indicator 5 Diode Test AUTO gt HOLD MAX 31 9 6 Continuity AG X X X me 0 lt 0 z0 MVA L10 7 Display Hold ane ul 8 Max 9 Low Battery Indicator 11 10 Units 11 DMM Digit Display 12 AC DC Indicators 3 CT40 V1 3 09 09 Operation Transmitter and Receiver Cable Tester Operation 1 7 Press down the receivers ON OFF switch The upper blue display will indicate 00 and the OP LED should light Press down the transmitter s ON switch The OP LED will flash Connect one of the transmitter s alligator clips CH1 to CH16 to each core wire of the cable under test Connect the transmitter s COM reference lead black alligator to a known common for all cables such as ground or cable sheath Connect the receiver s COM terminal black alligator to the common Touch the receiver s input terminal red alligator test lead to one core of the cable under test The number of the wire selected is indicated on the display of the receiver 1 16 CAUTION Do not apply over 50V AC or DCV to test leads of transmitter or receiver This could result in permanent damage to the meter Continuity Beep Test Press the ID TEST button down Connect the receiver s red and black alligator clips to each end of a wire If there is continuity resistance is less than the continuity threshold there will be an audible tone Voltage Check Press t2. performed to verify meter performance and accuracy PO Ne De ON ark won Saw amp Support line 781 890 7440 Technical Support Extension 200 E mail support extech com Repair amp Returns Extension 210 E mail repair extech com 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 7 CT40 V1 3 09 09 Specifications Max input voltage Diode Test Continuity Check Display Over range indication Polarity Low Battery Indication Input Impedance AC Response ACV Bandwidth Auto Power Off Fuse Batteries Operating Temperature Storage Temperature Weight Size Standards Transmitter Specifications Display Alligators Cable resistance Power Power current Operating temperature Storage temperature Receiver Specifications Display Alligators Power Power current Operating temperature Storage temperature Continuity test Cable voltage check 600V AC DC Test current 1mA max open circuit voltage of 1 5V typical Audible threshold between 15Q and 2000 2000 count 3 1 2 digit LCD LCD displays OL Minus sign for negative polarity BAT symbol indicates low battery condition gt 7 5MQ VDC amp VAC Average responding 50Hz to60Hz 15
3. User s Guide EXT INSTRUMENTS A FLIR COMPANY Cable Tester and Digital Multimeter Model CT40 Introduction Congratulations on your purchase of the Extech CT40 This meter is shipped fully tested and calibrated and with proper use will provide years of reliable service The CT40 is a cable tester which uses a transmitter receiver to allow for wire identification of an individual core to the end of a multi core cable The meter s digital multimeter functions provides for easy measurement of AC DC Voltage AC DC Current Resistance Continuity and Diode check Safety International Safety Symbols This symbol adjacent to another symbol or terminal indicates the user must refer to the manual for further information A This symbol adjacent to a terminal indicates that under normal use hazardous voltages may be present l Double insulation Safety Notes e Do not exceed the maximum allowable input range of any function e Set the function switch OFF when the meter is not in use e Remove the battery if meter is to be stored for longer than 60 days Warnings e Set function switch to the appropriate position before measuring e Do not measure current on a circuit whose voltage exceeds 600V e When changing ranges always disconnect the test leads from the circuit under test Cautions e Improper use of this meter can cause damage shock injury or death Read and understand this user manual before operating the
4. e Q position Insert the black test lead into the negative COM terminal and the red test lead into the positive Q terminal Touch the test probe tips across the circuit or part under test It is best to disconnect one side of the part under test so the rest of the circuit will not interfere with the resistance reading Read the resistance in the display WARNING To avoid electric shock disconnect power to the unit under test and discharge all capacitors before taking any resistance measurements 5 CT40 V1 3 09 09 Continuity Check WARNING To avoid electric shock never measure continuity on circuits or wires that have voltage on them Set the function switch to the D position 2 Insert the black lead banana plug into the negative jack COM and the red test lead banana plug into the positive jack Q 3 Press the MODE button until the symbol appears in the display 4 Touch the test probe tips to the circuit or wire you wish to check 5 Ifthe resistance is less than the continuity threshold the audible signal will sound The display will also show the actual resistance DIODE TEST WARNING To avoid electric shock do not test any diode that has voltage on it Set the function switch to gt position 2 Press the MODE button until the symbol appears in the display 3 Insert the black test lead banana plug into the negative jack COM and the red test lead banana plug into the pos
5. he V check button down Connect both of the receiver s alligator clips to each end of the cable under test If the display indicates UU then voltage is present on the cable Locate and remove the voltage source before proceeding with cable testing 4 CT40 V1 3 09 09 Digital Multimeter Functions AC DC Voltage Measurements 1 2 3 4 Insert the black test lead into the negative COM terminal and the red test lead into the positive V terminal Set the rotary function switch to VAC or VDC position Connect the test leads in parallel to the circuit under test Read the voltage measurement on the LCD display CAUTION Do not measure AC DC voltages if a motor on the circuit is being switched ON or OFF Large voltage surges may occur that can damage the meter AC DC Current Measurements 1 2 Set the function switch to the pA mA position Insert the black test lead into the negative COM terminal and the red test lead into the positive pA mA terminal For current measurements up to 2000A DC AC set the function switch to the mA position Press the MODE button to indicate DC AC on the display Connect the meter in series with the circuit under test the black test probe tip to the negative side of the circuit and the red test probe tip to the positive side of the circuit Apply power to the circuit Read the current in the display Resistance Measurements 4 Set the function switch to th
6. itive jack Q 4 Touch the test probe tips to the diode or semiconductor junction you wish to test Note the meter reading 5 Reverse the probe polarity by switching probe position Note this reading 6 The diode or junction can be evaluated as follows A If one reading shows a value and the other reading shows OL the diode is good B If both readings show OL the device is open C If both readings are very small or 0 the device is shorted NOTE The value indicated in the display during the diode check is the forward voltage MAX Hold Function 1 Press the MAX Hold Button The meter continues taking measurements but the display shows only the highest MAX reading recorded 2 Press the Max Hold Button again to return to normal operation Data Hold Function 1 Press the Data Hold Button The HOLD indicator will appear The hold function freezes the reading in the display 2 Press the Data Hold Button again to return to normal operation Auto Power OFF Function The auto off feature will turn the meter off after 15 minutes 6 CT40 V1 3 09 09 Maintenance REPLACING THE FUSES WARNING To avoid electric shock disconnect the test leads from any source of voltage before removing the fuse cover Disconnect the test leads from the meter Remove the battery cover two B screws and the battery Remove the four A screws securing the rear cover Lift the center circuit board straight up from the connec
7. meter e Always remove the test leads before replacing the battery e Inspect the condition of the test leads and the meter itself for any damage before operating the meter Repair or replace any damage before use e Use great care when making measurements if the voltages are greater than 25VAC rms or 35VDC These voltages are considered a shock hazard e Voltage checks on electrical outlets can be difficult and misleading because of the uncertainty of connection to the recessed electrical contacts Other means should be used to ensure that the terminals are not live e If the equipment is used in a manner not specified by the manufacturer the protection provided by the equipment may be impaired 2 CT40 V1 3 09 09 Meter Description 1 Low Battery Indicator Receiver 1 2 44 2 Receiver Alligator Test Leads 3 Operation Indicator Receiver 5 4 On Off Switch Receiver i2 5 Hold Switch Digital Multimeter Mode 44 6 DMM Input Jacks 10 7 Max Button Digital Multimeter Mode 8 Mode Button Digital Multimeter Mode 9 LCD Display Multimeter Mode 10 Rotary Switch Multimeter Mode 11 ID Test Button Continuity Beep Test 12 V Check Button Cable Voltage Check 13 LCD Display for Cable Identifier Function 14 Operation Indicator Transmitter 15 Low Battery Indicator Transmitter 16 On Off Switch Transmitter 17 Transmitter Alligator Test Leads CH1 16 LCD display descriptions Cable ID Number Display
8. minutes approximately mA HA ranges 0 2A 250V fast acting Fuse 9V battery and two AAA batteries 32 F to 104 F 0 C to 40 C 14 F to 122 F 10 C to 50 C 10 8 oz 308g 6 3x2 9x1 7 162x74 5x44 0mm IEC61010 1 CAT IIl 600V Pollution degree II CE Approved Two red LED lamps 17Croc clips red 16 black 1 30K Ohm max 9V battery 1 8mA 0 C to 40 C 32 F to 104 Ff 10 C to 50 C 14F to 122 F Two digit blue LED display 2 Croc clips red 1 black 1 9V battery 23mA 0 C to 40 C 32 F to 104 F 10 C to 50 C 14 F to 122 F Audible threshold between 15Q and 1000Q 5V to 16V DC 8 CT40 V1 3 09 09 Multimeter Specifications Function Range Accuracy DC Voltage 200mvV 0 5 rdg 3d 2 000V 20 00V 1 0 rdg 3d 200 0V 600V 1 0 rdg 3d AC Voltage 2 000V 20 00V 1 0 rdg 5d 50 60Hz 200 0V 600V 1 5 rdg 10d DC Current 200 0uA 2000UA 1 5 rdg 3d 20 00mA 200 0mA 2 0 rdg 3d AC Current 200 0uA 2000UA 1 8 rdg 8d 20 00mA 200 0mA 2 5 rdg 8d 200 0Q 0 8 rdg 5d Resistance 2 000kQ 20 00kQ 200 0kQ 1 2 rdg 3d 2 000MQ 2 0 rdg 5d 20 00MQ 5 0 rdg 8d 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 se
9. nsors 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 Copyright 2009 Extech Instruments Corporation a FLIR company All rights reserved including the right of reproduction in whole or in part in any form 9 CT40 V1 3 09 09 10 CT40 V1 3 09 09
10. tors to gain access to the fuse holders Gently remove the old fuse and install the new fuse into the holder Always use a fuse of the proper size and value 0 2A 250V fast blow for the 200mA range Replace and secure the rear cover battery and battery cover 7 Align the center board with the connectors and gently press into place 8 Replace and secure the rear cover battery and battery cover WARNING To avoid electric shock do not operate your meter until the fuse cover is in place and fastened securely BATTERY INSTALLATION WARNING To avoid electric shock disconnect the test leads from any source of voltage before removing the battery cover 1 When the Low Battery Indicator is lit on the Transmitter or the Receiver it is necessary to replace the battery Turn power off and disconnect the test leads from the meter Open the rear battery cover by removing the screw Insert the battery into battery holder observing the correct polarity Put the battery cover back in place Secure with the screw WARNING To avoid electric shock do not operate the meter until the battery cover is in place and fastened securely 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
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