Extech 380360 Digital Megohmmeter Manual PDF
Contents
1. i conductors in turn LO HI Test leads 4 Check insulation resistance between conductors by connecting meter leads to conductors in pairs Refer to diagram at right In the diagram note that the 3 conductor cable has two wires shorted to the ground shield This two wire shield connection is then connected to one side of the meter The remaining conductor is connected to the other side of the meter 7 Model 380360 Version 1 7 September 2003 Application Note for Large Installations In large wiring installations where the insulation of outlets is being tested more than one insulation resistance measurement may have to be made to take into account parallel resistances Divide large systems into subgroups and test subgroups individually Also in large installations the capacitance of the insulation will be high thereby taking longer to charge when being tested Care must be taken not to finish a measurement until the insulation capacitance is fully charged a steady stable reading is an indication that this is the case Be careful not to turn the range switch while the test button is pressed Repair and Calibration Extech offers repair and calibration services for the products we sell Extech also provides NIST certification for most products Call the Customer Service Department for information on calibration services available for this product Extech recommends that annual calibrations be performed to verify meter performance and ac2. to freeze the displayed reading The H will appear on left side of the display when the meter is in the Data Hold mode Move the switch to the left position to exit the Data Hold mode the H indicator will switch off Maintenance Battery Replacement When the low battery symbol appears BT on the LCD the six 1 5V AA batteries must be replaced 1 Turn the meter is off and remove the test leads 2 Remove the Phillips head screw on the rear of the meter 3 Remove the battery compartment cover 4 Replace the batteries observing polarity 5 Affix the rear cover and secure the rear screw Cleaning Periodically wipe the case with a dry cloth Do not use solvents or abrasives to clean this instrument 6 Model 380360 Version 1 7 September 2003 Applications Measuring Power Tools and Small Appliances This section applies to any device under test that uses a line cord For double insulated power tools the meter s leads should be connected to the device s housing chuck blade etc and the ground of the power cord Refer to the diagram Meter test leads Testing AC Motors Disconnect the motor from the line by disconnecting the wires from the motor terminals or opening the mains switch If the mains switch is opened and the motor also has a motor starter then the starter must be held in the ON position With the mains switch opened the measured resistance will include the resistance of the
3. 1000 to 2000MQ 1000VDC Model 380360 Version 1 7 September 2003 Meter Description 380360 INSULATION TESTER LCD Display Rotary function switch Data hold switch Test button Manual Lock select switch HI input terminal COM input terminal LO input terminal o oO Naar ON Positive test lead 10 Negative test lead Warning Ensure that the circuit under test does not include components that can be damaged by 1000VDC such devices include power factor correction capacitors low voltage mineral insulated cables electronic light dimmers and ballasts starters for fluorescent lamps Operation Connecting Test Leads For the MQ range connect the red test lead to the HI input terminal and the black test lead to the LO input terminal For the 200Q and 600VAC functions connect the red test lead to the HI right input jack and the black lead to the COM center jack Test Lead Check 1 Connect the red test lead to the HI input terminal black lead to the COM terminal Set the rotary switch to the 200Q range Set the HOLD switch to the left off position and the MANU LOCK switch to the MANUAL position Touch the test lead tips together Press the red TEST button Resistance should read less than 19 and the audio tone should sound 7 With the leads not touching the display should read 1__ indicating over range 8 Readings displayed o
4. User Guide EXTECH INSTRUMENTS Model 380360 Insulation Tester Megohmmeter Introduction Congratulations on your purchase of Extech s Insulation Tester Megohmmeter The Model 380360 provides three test ranges plus continuity and an AC voltage test A handy 3 minute test lock feature and a data hold switch are also included This professional meter with proper care will provide years of reliable service 4 Model 380360 Version 1 7 September 2003 Safety 1 Circuits under test must be de energized and isolated before connections are made except for voltage measurements 2 Circuit connections must not be touched during a test Use extreme caution when working near bare conductors and bus bars Accidental contact with conductors could result in electrical shock 3 Use caution when working near voltages above 60VDC or 30VACrms After insulation tests capacitors must be discharged 5 Test leads including alligator clips must be in good working order clean and without broken or cracked insulation 6 When servicing use only specified replacement parts International Safety Symbols A Caution refer to this manual before using this meter AN Dangerous Voltages E Meter is protected throughout by double or reinforced insulation Specifications General specifications Display 0 65 3 1 2 digit 2000 count LCD Sampling rate 2 5 readings p
5. curacy T Support Hotline 781 890 7440 Tech support Ext 200 Email support extech com Repair Returns Ext 210 Email repair extech com Website www extech com Warranty EXTECH INSTRUMENTS CORPORATION 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 on 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 at www extech com click on Contact Extech and go to Service Department to request an RA number 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
6. er second Test ranges 2000M9 1000VDC 200M9 500VDC 200M2 250VDC AC Voltage range 600VAC Resistance range 2009 Over range indicator 4 displayed Zero adjust Automatic Low battery indicator BT symbol displayed when battery voltage is low Power source Six 6 1 5 AA batteries Power consumption 20 to 95mA depending upon function Operating conditions 32 to 104 F 0 to 40 C 80 RH Dimensions 6 5 x 3 9 x 2 2 165 x 100 x 57mm Weight 1 1 Ibs 500g 2 Model 380360 Version 1 7 September 2003 Range Specifications Accuracies are specified as reading digits at 23 C lt 80 RH RESISTANCE Range Res Accuracy Max open Overload circuit Volt Protect 2002 0 10 1 2d 3 3V 500Vrms CONTINUITY Range Res Audible tone Max open Overload circuit Volt Protect 2002 0 10 lt 1000 3 3V 500Vrms AC VOLTAGE Range Res Accuracy Input impedance Overload Protect 600VAC 1V 0 8 3d 10MQ 750Vrms MEGOHMMETER RANGES Range Res Accuracy Terminal voltage 200MQ 250VDC oiio 250V 10 0 200M2 500VDC 3 5d 500V 10 0 0 to 1000MQ 1000VDC 1MQ 1000V 10 0 1000 to 2000MQ 1000VDC 5 5d Range Test Current Load Short circuit Current 200MQ 250VDC 250KQ 200MQ 500VDC 500KQ 1mA lt 1 5MA 0 to 1000MQ 1000VDC 1MQ
7. fter 3 minutes Notes on IR Megohmeter testing A The maximum measurement range for the 380360 is 2000MQ 2GQ Frequently insulation resistance will exceed this value When this happens the display will indicate 1 a meaning the resistance is very high and the insulation being tested is good z If the device being tested is highly capacitive the display will indicate an increasing resistance value over time Always wait until the reading has stabilized before recording the value 5 Model 380360 Version 1 7 September 2003 Low Resistance and Audible Continuity Tests WARNING Do not run this test unless ACV 0 Do not use this mode to check diodes 1 Set the Rotary switch to the 200Q position 2 Connect the red test lead to the HI input terminal black lead to the COM terminal 3 Connect the tips of the test leads to both ends of the circuit under test 4 Press the red TEST button and read the resistance on the LCD 5 When the resistance of a circuit is less than approx 100Q the audible tone will sound AC Voltage Tests 1 Set the Rotary switch to the red 600V position 2 Connect the red test lead to the HI terminal and the black test lead to the COM terminal Connect the other end of the test leads to the circuit under test Read the voltage value on the LCD Data Hold Function The Data Hold function freezes the displayed reading Move the HOLD switch to the rightmost position
8. motor wire and all other components between the motor and the main switch If a weakness is indicated the motor and other components should be checked individually If the motor is disconnected at the motor terminals connect one meter lead to the grounded motor housing and the other lead to one of the motor leads Refer to diagram at below GND Notes i 1 The STARTER must be in the ON position during Lo HI i the test meter test leads 2 The motor to meter connection must be made to the motor housing ground 3 The meter to main switch connection must be to the motor side of the main switch as shown Testing DC Motors Disconnect the motor from the line 2 To test the brush rigging field coils and armature connect one meter lead to the grounded motor housing and the other lead to the brush on the commutator 3 Ifthe resistance measurement indicates a weakness raise the brushes off of the commutator and separately test the armature field coils and brush rigging one at a time Leave one lead connected to the grounded motor housing while testing the motor components This also applies to DC Generators Testing Cables Disconnect the cable under test from the line 2 Disconnect the opposite end of the cable to avoid errors as a result of leakage from other equipment 3 Check each conductor to ground and or lead sheath by connecting one meter lead to ground and or lead sheath and the other meter lead to each of the
9. oral is expressed or implied Copyright 2003 Extech Instruments Corporation All rights reserved including the right of reproduction in whole or in part in any form 8 Model 380360 Version 1 7 September 2003
10. ther than the readings described above are indicative of a test lead problem The test leads must be replaced before using the meter Failure to do so could result in damage to equipment and electrical shock 4 Model 380360 Version 1 7 September 2003 Insulation Resistance Measurements Megohmmeter Tests Warning Do not perform Insulation Resistance measurements if AC Voltage is present on the device under test 6 3 Minute Test Lock For hands free operation use the TEST LOCK feature 1 Connect the red test lead to the HI input terminal black lead to the LO terminal Set the HOLD switch to the left off position and the MANU LOCK switch to the MANUAL position Set the rotary switch to the desired test voltage 250V 500V or 1000V Connect the tips of the test leads to the equipment under test Press and hold the TEST button Release the test button to stop the test Read the measurement value on the LCD display Connect the red test lead to the HI input terminal black lead to the LO terminal Set the rotary switch to the desired voltage test position 250V 500V or 1000V Connect the tips of the test leads to the equipment under test Set the MANU LOCK switch to the LOCK position Press and release the red TEST button A 3 minute continuous test will begin The red TEST button can be pressed at any time to end the test If the TEST button is not pressed the meter automatically stops the test a
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