User`s Guide Model 380580 Battery Powered Milliohm Meter
Contents
1. Set the Function switch to the 200 0mQO position The NO TEST status LED will light Momentarily press the Islas button the meter will intermittently beep The display should indicate 00 0 Momentarily press the button to stop the test The NO TEST status LED will light Remove the shorts from P4 and P5 and C4 and C and Short the test leads P to C and P to C The Rp LED as well as the NO TEST status LED should light indicating an over voltage or over range Turn the rotary selector switch to OFF Short the test leads P to C2 and P to C together Set the Function switch to the 200 0mQ position The 1 negative indicator should appear in the display Short the all the leads P1 P2 C2 C1 together The P4 P2 C2 C1 order is important Set the Function switch to the 200 0mQ position The NO TEST status LED will light Momentarily press the Islas button the meter will intermittently beep The display should indicate near 00 0 depending on the test clip connections and both Rp and Rc LEDs should remain off Momentarily press the ERIE button to stop the test Note These tests can be performed on any range 3 380580 EN V2 3 4 12 Measurement Procedure 1 Select the desired measuring range on the meter If the resistance of the device is unknown start with the highest range and work downward Clip the test leads onto the device under test Not2. further information may be present Double insulation A This symbol adjacent to a terminal indicates that under normal use hazardous voltages 7 380580 EN V2 3 4 12 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 for authorization 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 re
3. User s Guide EXTECH INSTRUMENTS A FLIR COMPANY Model 380580 Battery Powered Milliohm Meter Digital Milliohm Meter EXTECH 380580 m Introduction Congratulations on your purchase of Extech s Model 380580 Battery Powered Milliohm Meter This device offers five resistance ranges with resolution as low as 0 1mQ The 4 wire Kelvin clip connection ensures optimum accuracy Typical applications include transformer motor coil and PC Board resistance measurements This professional meter with proper care will provide years of safe reliable service Meter Description Current Terminals Potential Measurement Terminals LCD Display Start Stop Test Button Range Select Power Switch LED Error Lights No Test Over Temperature Og PONS Digital Milliohm Meter Re Voltage Regulation EXTECH 380580 Rc Current Regulation 7 Current Range Table Leads Current Leads Banana plug to alligator clip C1 Green C2 Blue Voltage Potential Leads Banana plug to alligator clip P1 Red P2 Black Kelvin Clips Banana Plugs 2 to Kelvin Clip Red P1 Green C1 Black P2 and Blue C2 Measurement Considerations Do not apply voltage to the meter input terminals Meter damage may result 2 Always insure that the circuit to be measured is switched OFF isolated and completely de energized before connecting the test le
4. ads 3 Ifthe Over Temperature LED NO TEST indicator is lit allow the instrument to cool down before proceeding further 4 The Rc led indicates when the test current falls out of regulation Selecting a higher range may eliminate the condition 5 The Rp led indicates when the voltage on the device under test is too high Selecting a lower range may eliminate the condition If either the Rc or Re led is on the measurement may be in error The current terminals are fuse protected Keep the potential test leads as short as possible Long leads may introduce noise or lo When using the four separate alligator clip leads always place the current leads outside the potential leads 2 380580 EN V2 3 4 12 Preliminary Checks Current Regulation Check 1 2 3 4 5 6 T Voltage Measurement check 1 2 9 Polarity check 1 2 3 Operation check Use the Kelvin clips for this test 1 2 5 Connect the current leads C4 and C to the meter Set the function switch to the 200 0mQ range Momentarily press the ESSUEIME button The meter will intermittently beep and Rc will light Short the current leads C to C The Rc LED should go off indicating that the meter is operating correctly Momentarily press the JESSIE button to stop the test The meter will return to NO TEST status With the current test leads C4 and C shorted connect and short the potential voltage leads P4 and P
5. e When using the 4 wire 4 alligator clip test leads it is recommended that the current test leads be outside of the potential test leads as shown in the diagram below For a short test duration of 10 seconds press the TEST Rp button for less than 2 seconds This EnerSave feature can be used to conserve battery power For a long test duration of 60 seconds press the TEST Rp button for more than 3 seconds During the test the meter will intermittently beep At the end of the test or if the test is stopped HOLD will appear and the last reading will be frozen on the display Digital Milliohm Meter EXTECH 380580 Digital Milliohm Meter EXTECH 380580 4 380580 EN V2 3 4 12 Measurement Principles The test current flows through the resistance from the Current C terminal to the Current C terminal The P and P POTENTIAL terminals measure the voltage drop across the device under test only thus eliminating the lead and contact resistances The meter displays the resistance based on the test current and the measured voltage refer to the equation below C P Volts Current P A C Rx Vx Is Where Vx is the voltage drop across the device under test Is is the test current Rx is the resistance of the device under test Thermal Effects Temperature can have a significant effect on the per
6. formance of millohmeter due to the temperature coefficient of the resistance under test and thermal EMF s across dissimilar conductors Most conductors have a large temperature coefficient of resistance For example 0 4 C for copper A copper conductor that has a resistance of 10 00m ohm at 20 C will increase to 10 40m ohm at 30 C This should be taken into account A current going through a resistance will also elevate the temperature so duration of the test can also change the resistance 5 380580 EN V2 3 4 12 BATTERY INSTALLATION WARNING To avoid electric shock disconnect the test leads from any source of voltage before removing the battery cover 1 Turn power off and disconnect the test leads from the meter 2 Open the rear battery cover by removing two screws B using a slotted head screwdriver 3 Insert the batteries into battery holder observing the correct polarity 4 Putthe battery cover back in place Secure with the screws You as the end user are legally bound Battery ordinance to return all used batteries and accumulators disposal in the household garbage is prohibited You can hand over your used batteries accumulators at collection points in your community or wherever batteries accumulators are sold Disposal Follow the valid legal stipulations in respect of the disposal of the device at the end of its lifecycle REPLACING THE FUSES There are three fuses Power Supply Fuse 1 The power
7. pair 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 accuracy Support lines U S 877 439 8324 Intl 603 324 7800 Technical support Option 3 E mail support extech com Repair amp Returns Option 4 E mail repair extech com Product specifications subject to change without notice Visit our website www extech com Extech Instruments Corporation 9 Townsend West Nashua NH 03063 ISO 9001 Certified since 1995 8 380580 EN V2 3 4 12
8. supply fuse is located in the battery compartment 2 Remove the two screws to open the battery compartment 3 Always use a fuse of the proper size and value Current Circuit Fuse 1 Fuse protection for the current terminals If the fuse is blown the Rc LED will stay on The fuse is located under the printed circuit board There are 4 mounting screws that have to be removed Two screws are located under the black feet on the bottom of the unit The other two screws are located in the battery compartment Remove the battery compartment door and the batteries to access these screws Always use a fuse of the proper size and value Qc OY Qr d co Potential Circuit Fuse 1 Fuse protection for the potential terminals If the fuse is blown the Re LED will stay on The fuse is located under the printed circuit board There are 4 mounting screws that have to be removed Two screws are located under the black feet on the bottom of the unit The other two screws are located in the battery compartment Remove the battery compartment door and the batteries to access these screws Always use a fuse of the proper size and value o ND Ne WON 6 380580 EN V2 3 4 12 Specifications General Specifications 1 0 25 mm LCD 1999 counts Range Specifications Range Range Resolution Current reading Voltage International Symbols This symbol adjacent to another symbol or terminal indicates the user must refer to the manual for
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