User`s Manual Digital High Voltage Insulation Tester Model 380375
Contents
1. and decay Automatic discharge After automatic amp manual stop or upon completion of test Low battery indicator Replace battery displayed when battery voltage is low Power source Eight 1 5V AA cells Battery life 40 hrs no load at 5kV Auto Power off After 30 minutes Enersave mode Shorter test time to conserve battery life Operating conditions 32 to 104 F 0 to 40 C lt 80 RH Storage conditions 14 to 140 F 10 to 60 C lt 80 RH Dimensions 4 7 x 6 7 x 3 7 120 x 170 x 95mm Weight 1 94 Ibs 880g Range Specifications Test Resistance Short Accuracy Resolution Voltage Ranges Circuit Current 500V DC 0 to 25 GQ 1mA 1000V DC 0 to 50 GQ 1mA 0 to 50GQ 3 reading 1kQ 2500V DC 0to 125GQ 1mA 50 to 250GQ 5 reading 5000V DC Oto250 GQ 1 6 mA Meter Description Q RN ec located on bottom of unit Test lead jacks compartment Dot Matrix Display Voltage test buttons ON TEST button Battery compartment is HIGH VOLTAGE MIC EXT INSTRUMENTS DIGITAL INSULATIO ICROPROCESSOR CONTROLLE N TESTER D 5KV 25KV 1KV 500V ON LIVE SYSTEM DO NOT USE C 380375 V1 5 3 04 Operation Note Ensure that the circuit under test does not include devices or components that can be damaged by 5000VDC such devices include power factor cor2. 200 Email support extech com Repair Returns Ext 210 Email repair extech com Website www extech com Copyright 2002 Extech Instruments Corporation All rights reserved including the right of reproduction in whole or in part in any form 8 380375 V1 5 3 04
3. User s Manual EXTE INSTRUMENTS Digital High Voltage Insulation Tester Model 380375 HIGH VOLTAGE DIGITAL INSULATION TESTER MICROPROCESSOR CONTROLLED EI ErT TCT CIZ SELECT IESTsSKV 2 SKU IK 500 AUTO RANGING AUTO OFF 5KV 2 KV 1KV 500V ON TEST DO NOT USE ON LIVE SYSTEM EXTECH CE INSTRUMENTS 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 li
4. ability 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 Introduction Congratulations on your purchase of Extech s High Voltage Insulation Tester This device has four voltage test ranges up to 5kV and measures insulation resistance to 250GQ This professional meter with proper care will provide years of safe reliable service Safety 1 Circuits under test must be de energized and isolated before connections are made 2 Circuit connections must not be touched during a test 3 After insulation tests capacitors must be discharged 4 Test leads including alligator clips must be in good working order clean and without broken or cracked insulation an When servicing use only specified replacement parts 6 Environmental conditions Indoor use only Installation category II Pollution degree 2 e Altitude up to 2000 meters Relative Humidity 80 max Temperature 0 to 40 C International Safety Symbols N Caution refer to this manual before using this meter A Dangerous Voltages risk of electric shock Meter is protected throughout by double or reinforced insulation 2 380375 V1 5 3 04 Specifications General specifications Display 2 x 16 character alphanumeric multi function dot matrix Range selection Automatic ranging Bargraph Displays voltage ramp soak
5. e circuit is live the display will indicate Live Warning Circuit Live and the meter will beep If this occurs remove the test leads and press the ON TEST button 4 Press the ON TEST button to apply the voltage and begin the test The meter will beep every 2 seconds which indicated high voltage is on the test leads and the meter will intermittently buzz while the high voltage is being generated 5 On the display elapsed test time appears on the a upper right the resistance reading appears on the R 108 2MQ 6 5s upper left the selected voltage is shown on the lower 02 EI 500V right and the bar graph indicates the actual voltage present on the test leads 6 At the completion of the test the meter will discharge R 128 4MQ 7 4s the device under test and the display HOLD Do not 95 HOLD 500V remove the test leads until the bargraph disappears complete discharge and HOLD appears in the display 7 The meter automatically discharges the system at the end of the test The test ends when one of the following occurs a After approximately 10 seconds in the Enersave mode b After approximately 100 seconds in the continuous mode c When the red ON TEST button is pressed 4 380375 V1 5 3 04 The Enersave Mode Enersave conserves battery life by reducing the test time from 100 seconds to approx 10 seconds Enersave is the default mode of operation To disable Enersave press and h
6. e transformer Note that at least 1 minute should be allowed between each test High voltage winding to low voltage winding and ground Low voltage winding to high voltage winding and ground High voltage winding to low voltage winding pictured below High voltage winding to ground Low voltage winding to ground OP ONS Connect the ae YS Qu BLACK lead here Connect the pE RED lead here uu 3 7 380375 V1 5 3 04 Maintenance Battery Replacement When REPLACE BATTERY appears on the display replace the eight 1 5V AA batteries OW Pn Ne 6 Ensure that the meter is powered down and that the test leads are not connected Close the instrument cover and turn the instrument upside down Remove the phillips head screw located on the bottom of the meter Remove the battery compartment cover Replace the eight batteries ensuring proper polarity 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 Repair and Calibration Extech offers complete repair and calibration services for all of the products we sell For periodic calibration NIST certification or repair of any Extech product call customer service for details on services available Extech recommends that calibration be performed on an annual basis to insure calibration integrity T Support Hotline 781 890 7440 Tech support Ext
7. old the ON TEST button for three seconds to begin a test Bargraph Voltage Display The bargraph represents the voltage present on the test leads as it charges soaks and discharges The bargraph appears on the lower portion of the display during tests Automatic Low Resistance Detect If the display shows the message LOW MQ the test should be interrupted immediately by pressing the ON TEST button This message indicates that the insulation under test has broken down and the meter is trying to inject a high potential onto a short circuit Elapsed Timer The test duration is indicated on the display This is particularly useful in determining whether an insulating material under test will break down in a given amount of time Manual Test STOP To stop a test in progress press the ON TEST button The test will immediately end and the system will automatically discharge Automatic Test STOP The test automatically stops after 100 seconds if the meter is not in the Enersave mode When in the Enersave mode the test automatically stops after approx 10 seconds Live Circuit Warning If the test leads are connected to a live circuit when testing a warning beeper will sound and the meter will display Live Warning Circuit Live In this case correct the problem and retest Automatic Discharge At the end of a test the meter automatically discharges the high voltage The automatic discharge status is reflected on the di
8. rection capacitors low voltage mineral insulated cables electronic light dimmers ballasts and starters for fluorescent lamps Connecting the Test Leads to the meter The Black Earth and Red Line test leads connect to the meter in the lead compartment located on the back of the meter the meter jacks are color coded NOTE The Green Guard lead is typically not used Do not connect this test lead to the meter unless absolutely certain it is going to be used For more information continue reading this Operation section and the Applications section to follow Connecting the Test Leads to the device under test The Black Earth lead is connected to the conductive material The Red Line lead is connected to the insulating material The Green Guard lead is at the same potential as the negative terminal 0V and when required is used to prevent erroneous readings by removing parallel leakage paths from the measurement Insulation Resistance Measurements 1 Connect the test leads to the meter and the device under test 2 Press the ON TEST button to turn the unit on The unit will display the turn on screens and then stop at the Select Test display Select Test gt 5kV 2 5kV 1kV 500V 3 Select the desired test voltage by pressing the 500V 1KV 2 5KV or 5KV button The screen will briefly Connect Leads display the selected test voltage and then will proceed to the Connect Leads Testing for LIVE display If th
9. splay During discharge the beeper will sound and when completely discharged the HOLD icon appears on the display Auto OFF The meter will automatically turn off after approximately 30 minutes of operation 5 380375 V1 5 3 04 Applications Measuring Power Tools and Small Appliances For small appliances connect the Black EARTH lead to conductors and the Red LINE lead to insulating material For single or double insulated power tools one lead should be connected to the device s chuck blade etc and the other lead to one of the AC power cord conductors test both conductors in turn Refer to the power tool application diagram below lt xA Connect the BLACK lead to the chuck J For 2 or 3 prong plugs connect the L 7 4 RED lead to one conductor at a time Testing Motors AC Motors Disconnect the motor from the line by a Disconnecting the wires from the motor terminals or b Opening the main switch If the main switch is opened and the motor also has a motor starter then the starter must be held in the ON position With the main switch opened the measured resistance will include the resistance of the 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 the RED lead to the grounded motor housing and the BLACK lead to one of the mo
10. tor leads DC Motors 1 Disconnect the motor from the line 2 To test the brush rigging field coils and armature connect the RED lead to the grounded motor housing and the BLACK lead to the brush on the commutator Connect BLACK lead to the motor leads Connect RED lead to grounded housing 3 Ifthe resistance measurement indicates a weakness raise the brushes off of the commutator and separately test the armature field coils and brush rigging by connecting one lead to each individually leaving the other connected to the grounded motor housing This also applies to DC Generators Testing Single Conductor Cables 1 Completely disconnect the cable Core under test from its source and destination Insulation Sheath Covering EARTH GUARD LINE 2 Connect the test leads to the cable as shown at right 6 380375 V1 5 3 04 Testing Multi Conductor Cables EARTH 1 Completely disconnect the Testing one cable under test from its conductor to source and destination sa all of the 2 Refer to the diagrams at conductors right for three possible tests LINE EARTH LINE Testing one conductor GUARD to earth GUARD Testing one conductor to all conductors LINE minus ground EARTH Transformer Testing Transformer tests are performed with the transformer completely disconnected from the line and the load Note that the case ground should not be removed The five tests listed below will completely test a single phas
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