User Manual - PMC Rentals
Contents
1. It is activated by holding down the TEST button and pressing the LOCK button Note See analogue section for MIT310A Warning Hazardous voltages can exist on the insulation test range all the time the TEST button is locked down Voltage warning MIT300 only If a voltage exists on the circuit under test the instrument will emit a warning beep If a voltage greater than 50 V exists testing will be automatically inhibited Voltage warning MIT310A only If a voltage exists on the circuit under test the voltmeter will indicate this However voltages under 50 V will be displayed but may be difficult to read from the analogue display Default voltmeter MIT310 MIT320 and MIT330 The default voltmeter automatically operates if a voltage is present across the test probes of greater than 25 V In Volts range the meter operates at greater than 2 V If the voltage exceeds 50 V any further testing is inhibited for safety The voltage will be displayed Backlight operation MIT320 and MIT330 only Both the display and test ranges are backlit The backlight function can be selected at any time while the instrument is switched on by pressing the BACKLIGHT button The backlight function will switch off automatically 20 seconds after the instrument has finished testing Display warning symbols prefer to user manual Any time the warning triangle is displayed the operator should refer to the us2. M M MIT310 M M M GENERAL DESCRIPTION The MIT300 series variants have the following features MIT300 MIT310 MIT310A MIT320 MIT330 Insulation testing M 1 kV Insulation range METEN 500 V Insulation range HHRHH 250 V Insulation range foe ow ow a au Insulation test full scale 999 MQ Insulation limit alarm 0 01 MQ to 1 GQ Adjustable buzzer threshold 1 Q to 20 Q Lead null to 9 0 Q 10 Q to 1M Q resistance range Voltmeter range 600 V digit Continuity buzzer Stored test lead null CASE CONTENTS Please complete the warranty card and return it to Megger Limited as soon as possible to help us reduce any delays in supporting you should Features p l p y y Pp 8y the need arise Locking test button Case contents Backlight and rotary 1 X MIT300 series insulation tester switch illuminations 1 x Red Black test lead set with clips Voltage warnin a 2 8 x AA LR batteries fitted Default voltmeter dy X Warranty card Auto power down with 1 x Certificate of test defeat an 1 x Calibration certificate Switched test probe connector l X CD containing user manual Switched test probe E Z Printed quick start guide Results storage 1 x USB lead MIT330 only Downloading 1 x SP4F switched probe MIT320 and MIT330 only USB WW LCD DISPLAY FRONT PANEL DIGITAL INSTRUMENTS MIT300 310 320 and 330 Insulation test Test lead Loo Voltage Display range Nack strap T
3. 2 kQ From 0 00 Q to 10 Q test current is greater than 200 mA From 10 Q to 100 Q test current is greater than 20 mA See page 15 for MIT310A Test lead Null See page 14 for MIT310A Before using the continuity range or buzzer range for the first time the test lead resistance should be zeroed out This ensures any measurement does not include the resistance of the test leads 1 Connect the test leads to the instrument and firmly short both leads together 2 Wait for the reading to stabilise and press the TEST button 3 Display of the fo confirms test leads zeroing The display should be 0 00 Q Note Lead zeroing is retained when the instrument is switched off or auto shut off operates To remove the lead zero press the TEST button again Continuity test MIT300 310 320 and 330 See page 15 for MIT310A To make a continuity measurement 1 Turn the instrument On by selecting the continuity Q range 2 If required zero test lead resistance see test lead null above 3 Connect the test probes to the isolated circuit under test The test will start automatically 10 4 The display shows the resistance value Maximum 99 9 Q 5 Disconnect the test probes to terminate the test 6 On completion of testing switch to the OFF position Alternatively auto shut off operates after a period of instrument inactivity CONTINUITY BUZZER MIT300 310 320 330 See page 15 for MIT310A Co
4. 330 MIT310A Measuring range Open circuit voltage Zero offset adjust MIT300 310 320 330 MIT310A Continuity buzzer MIT300 310 MIT320 330 MIT310A MIT300 310 320 330 MIT310A 0 01 Q 100 Q 0 50 Q on analogue scale 5V 1V 205 mA 10 mA 5 mA 3 2 digits 2 5 of scale length or 30 of reading 0 2 Q to 2 kQ 0 2 20 200 2 kQ 1 5 V 0 5 V 0 92 0 0 5 Q Operates at lt 5 Q Adjustable 1 Q to 20 Q Operates at lt 5 Q Response time lt 20 ms Response time lt 100 mS Resistance range MIT 320 and MIT330 only can be used for diode testing Measuring range 10 Q 1 MQ Open circuit voltage IV Short circuit current 1 5 MA Accuracy at 20 C 5 2 digits up to 100 kQ Measuring range MIT310A only 0 2 KQ refer to continuity Voltage range Measuring range 0 600 V a c 50 60 Hz or d c Accuracy at 20 C MIT300 310 320 330 d c or a c 50 60 Hz 1 2 digits MIT310A 2 5 of scale length for 50 60 Hz Temperature coefficient lt 0 1 per C on all ranges Default voltmeter all test modes except off MIT310 320 330 voltmeter gt 25 V a c or d c is applied display will operate as a voltmeter M300 Beeps and flash V on the display M310A Warning LED lights when TEST button is pressed Operates as voltmeter when test button not pressed Test inhibit If more than 50 volts is detected testing will be inhibited
5. Autopower down Auto power down operates after 10 minutes if left in standby mode Environmental Operating range 10 C to 60 C Operating humidity 93 R H at 40 C max Storage range 25 C to 70 C Environmental protection IP54 Results storage and downloading Capacity gt 1000 results Download USB download lead 1 8m supplied Download lead Type A to Type B Dimensions All units 203 x 148 x 78 mm Fuses Terminals 500 mA F 600 V 32 x 6 mm ceramic HBC 50 kA minimum Safety Meets the requirements of IEC61010 1 Cat III 600 V phase to earth Refer to safety warnings supplied Automatic discharge After an insulation test the item under test will be discharged automatically Any voltage present will be indicated on the display so that the discharge can be monitored Power supply Battery 8 x 1 5 V cells IEC LR6 type AA alkaline Rechargeable NiCAD or NiMH cells may be used Battery condition is constantly shown on the display as a four section bar graph Battery Life 5000 consecutive tests 5 seconds per test on any test using 2Ah batteries Weight All units 980gms E M C In accordance with IEC61326 1 Operational uncertainties Refer to www megger com 22 ACCESSORIES Included Accessories Test lead set red amp black with crocodile clips USB download lead MIT330 only Download Manager CD Quick start guide CD containing user manual Optional Accessories Fused lead set
6. alkaline batteries and may not give much warning before becoming exhausted To replace batteries Warning Do not switch the instrument on with the battery cover removed 1 Switch off the instrument and disconnect the instrument from any electrical circuits 2 The rear cover must not be opened if the test leads are connected 3 To avoid the possibility of electric shock do not press the test button or touch the fuse when changing batteries 4 To remove the rear cover release the screw at the bottom of the cover and lift the cover upwards 5 Remove the dead cells 6 Refit new batteries observing the correct polarity as marked on the battery compartment 7 Replace the cover Warning Incorrect battery cell polarity can cause electrolyte leakage resulting in damage to the instrument If the battery condition indicator does not show a full charge when battery cells are new a cell may be reversed Note Battery cells should not be left in an instrument which may remain unused for extended periods Fuse replacement user replaceable To check fuse select Q range Short circuit the test leads If the fuse is good the display will show approx 0Q Display of the fuse symbol indicates a ruptured fuse The fuse is located behind the rear cover The rear cover must not be opened if test leads are connected To avoid the possibility of shock disconnect the battery before touching the fuse A r
7. or MIT330 using the special 3 pole ve socket in place of the RED test lead N Select a suitable insulation test range 3 Press and hold down the SP4F probe button The MIT320 or MIT330 will start an insulation test A When the result has settled release the probe test button 16 TEST RESULT STORAGE MIT330 only Storing contintuity test results Results storage has the following structure 000 He 002 255 Job number b00 b01 b02 99 Distribution board No c00 c01 c02 99 Circuit number R12 RrN Rr2 Rr1 R1 amp R2 Circuit type P1 to P3 Phase Job number 000 001 Jacts as a work folder allowing a set of results to be saved in one folder When downloaded all results with the same job number can be sorted together no matter where they occur in the instruments memory Distribution board number b01 b02 and circuit reference c00 c01 Results can be assigned a specific distribution board number and circuit reference number prior to storing R1 R2 R12 Rrl etc circuit type allows a test to be defined as the circuit type P1 P2 Phase number each test can be stored under a particular phase P1 P2 or P3 Unique test number each test result is assigned a unique test number from 0 to 1999 This is automatic and cannot be adjusted To store a result 1 Make a continuity measurement as descried earlier and press STORE 2 Select job reference nu
8. the PC using the USB test lead 2 Set the tester range knob to Snd 3 Run Megger Powersuite Professional or Megger Download Manager on the PC 4 Select the appropriate downloading instrument from the list 5 Select download from tester 6 The test data will automatically download its contents to the PC A bar graph shows the status of the download Deleting test results To delete the latest test result 1 Set the range knob to dEL The display will flash dEL followed by the test number to be deleted 2 Press the OK button The last test result will be will be deleted WARNING This operation is not reversible To delete all test data 1 Set the range knob to dEL The display will flash AEL 2 Press the NEXT or LAST key The display will flash ALL 3 Press the OK button All the test results will be deleted A bar graph shows the progress of the deletion 17 WARNING This operation is not reversible All data will be deleted 18 REPLACING BATTERIES AND FUSES Batteries Battery type 8 x LR6 AA 1 5 V Alkaline or 8 x 1 2V NiCAD or 8 x 1 2V NiMH Fuse type 500 mA F HBC 50 kA 600 V Fuse blown symbol Low battery warning symbol The battery condition is continuously displayed by the symboli When the batteries are exhausted symbol will show L and testing is inhibited Note Fully charged NiMH or NiCAD rechargeable batteries show a lower charge than
9. 2 wire fused probe and clip set SP4F Switch probe MIT320 and MIT330 only Megger Certification Software Powersuite Pro Lite 16th Order Code 1002 001 25970 041 6111 442 5174 188 1002 015 6220 809 REPAIR AND WARRANTY The instrument contains static sensitive devices and care must be taken in handling the printed circuit board If an instrument s protection has been impaired it should not be used but sent for repair by suitably trained and qualified personnel The protection is likely to be impaired if for example it shows visible damage fails to perform the intended measurements has been subjected to prolonged storage under unfavourable conditions or has been subjected to severe transport stresses NEW INSTRUMENTS ARE GUARANTEED FOR 3 YEARS FROM THE DATE OF PURCHASE BY THE USER Note Any unauthorized prior repair or adjustment will automatically invalidate the Warranty INSTRUMENT REPAIR AND SPARE PARTS For service requirements for Megger Instruments contact Megger Limited or Megger Archcliffe Road Valley Forge Corporate Centre Dover 2621 Van Buren Avenue Kent CT17 9EN Norristown PA 19403 England U S A Tel 44 0 1304 502 243 Tel 1 610 676 8579 Fax 44 0 1304 207 342 Fax 1 610 676 8625 Megger operate fully traceable calibration and repair facilities ensuring your instrument continues to provide the high standard of performance and workmanship you expect These facilities are complement
10. IT310A is designed for use only in a controlled electromagnetic environment CAT II Measurement category I Equipment CAT M Measurement category HI Equipment CAT IV Measurement category IV Equipment connected between the electrical outlets and connected between the distribution panel and connected between the origin of the low voltage the user s equipment the electrical outlets mains supply and the distribution panel NOTE THE INSTRUMENT MUST ONLY BE USED BY SUITABLY TRAINED AND COMPETENT PERSONS Users of this equipment and or their employers are reminded that National Health and Safety Legislation requires them to carry out valid risk assessments of all electrical work so as to identify potential sources of electrical danger and risk of electrical injury such as inadvertent short circuits Where the assessments show that the risk is significant then the use of fused test leads may be appropriate CONTENTS Safety warnings Introduction General description Case contents LCD display Front panel digital instruments Connection panel Lid open closure Preparations for use all instruments Batteries Preliminary test lead check General operating instructions General functions Test lead connection Continuity measurement MIT300 310 320 330 Test lead null Continuity test MIT300 310 320 330 Continuity Buzzer MIT300 310 320 300 Continuity buzzer mode Setup mode MIT320 330 only 11 Insulation testing General Insula
11. Megger MIT300 Series Insulation and Continuity Testers USER MANUAL Asiriy WARNINGS m Safety Warnings and Precautions must be read and understood before the instrument is used They must be observed during use m The circuit under test must be switched off de energised and isolated before test connections are made when carrying out insulation and continuity tests m Circuit connections and exposed metalwork of an installation or equipment under test must not be touched m The live circuit warning and automatic discharge are additional safety features which may fail and therefore safe working practices must be observed m The voltage function will only work if the instrument is functional and switched on m After insulation tests capacitive circuits must be allowed to discharge before disconnecting test leads m The instrument should not be used if any part of it is damaged m Test leads probes and crocodile clips must be in good order clean and with no broken or cracked insulation m Ensure that hands remain behind guards of probes clips when testing m National Safety Authorities may recommend the use of fused test leads when measuring voltage on high energy systems m Replacement fuses must be of the correct type and rating Failure to fit the correctly rated fuse may result in a safety hazard and may cause damage to the instrument in the event of an overload m The battery cover must be in place whilst conducting tests m The M
12. UP The display should flash between CON and 5 00 Q Hold the TEST button down until the display shows 1 0 Q D N Release the TEST button A Press the TEST button again It will commence counting down from 20 Q 5 Release the TEST button at the desired value OO 6 Press the LOCK 4 button to store the value Buzzer ON OFF silent buzzer To disable the continuity buzzer 1 Switch the MIT320 or MIT330 to SETUP The display should flash between CON and 5 00 Q 2 Press and release the TEST button until the BUZ sign is displayed 3 Press and hold the TEST button to select the OFF option Press and hold again to select ON O 4 Press the Lock 4 to store the value 11 INSULATION TESTING GENERAL Refer to page 14 for additional MIT310A notes Safety note Insulation testing is performed at high DC voltages and could be hazardous if touched Always observe the safety precautions when performing an Insulation test and ensure all necessary health and safety precautions are observed Automatic Discharge Capacitive circuits are automatically discharged when the test button is released following an insulation test Insulation measurements are performed at either 250 V 500 V or 1000 V Insulation test FIG 1 The insulation tests apply a known voltage to the circuit under test and measure the resulting leakage current The circuit under test must be co
13. e exhausted refer to page 18 battery replacement Warning Do not switch the instrument on with the battery cover removed Preliminary test lead check Functional verification 1 Before each use of the instrument visually inspect the test leads prods and crocodile clips to confirm that their condition is good with no damaged or broken insulation 2 Check continuity of the test leads by firmly shorting the leads together and read the test lead resistance measurement directly from the display which should be less than 1 0 Q Refer to page 10 for operation guide 3 Supply voltage Using an approved method ensure the circuit to be tested has been fully disconnected from the supply prior to using the instrument GENERAL OPERATING INSTRUCTIONS Safety note If a voltage greater than 25 V appears on the circuit under test the instrument will default to a voltage measurement and display the supply voltage On supply voltages over 50 V the instrument will prevent the test button from performing an insulation test protecting your instrument from damage General functions Voltage Testing on High Energy Systems Use extreme care when using or measuring voltages above 30 V particularly in high energy systems Fused test leads are available as optional accessories for local situations where increased protection is required See accessories section Tests lock _ The LOCK 4 indicates when an INSULATION test range is locked ON
14. ed by a worldwide network of approved repair and calibration companies to offer 24 excellent in service care for your Megger products Returning your product to Megger UK and USA service centres 1 When an instrument requires recalibration or in the event of a repair being necessary a Returns Authorisation RA number must first be obtained from one of the addresses shown above You will be asked to provide the following information to enable the Service Department to prepare in advance for receipt of your instrument and to provide the best possible service to you m Model e g MIT300 m Serial number to be found on the underside of the case or on the calibration certificate m Reason for return e g calibration required or repair m Details of the fault if the instrument is to be repaired 2 Make a note of the RA number A returns label can be emailed or faxed to you if you wish 3 Pack the instrument carefully to prevent damage in transit 4 Ensure the returns label is attached or that the RA number is clearly marked on the outside of the package and on any correspondence before sending the instrument freight paid to Megger Copies of the original purchase invoice and packing note should be sent simultaneously by airmail to expedite clearance through customs In the case of instruments requiring repair outside the warranty period an immediate quotation can be provided when obtaining the RA number 5 You may
15. eplacement fuse must be of the correct type and rating Fuse 500 mA F H B C 50 kA min 600 V 32 mm x 6 mm PREVENTIVE MAINTENANCE The MIT series instruments require very little maintenance Test leads should be checked before use to ensure there is no damage Ensure batteries are removed if left unused for extended periods When necessary the instrument can be cleaned with a damp cloth Do not use alcohol based cleaners as these may leave a residue 19 SPECIFICATIONS Note For the MIT310A only the presence of fast transients in excess of 0 5kV or r f in excess of 1 volt on measured circuit may affect the results General Specification Insulation ranges Nominal test voltage MIT310 310A 320 330 1000 V 500 V 250 V d c MIT300 500 V 250 V d c Terminal voltage on open circuit 0 C 0 20 of rated voltage Measuring Range All instruments 10 KQ 999 MQ on all ranges Short circuit current 1 5 mA nominal Test current on load 1 mA at min pass values of insulation as specified in BS 7671 HD 384 and IEC 364 Accuracy at 20 C MIT300 310 320 330 3 2 digits up to 10 MQ 5 up to 100 MQ 30 up to full scale MIT310A 2 5 of scale length or 30 of reading 200 kQ to 10 MQ iconv Terminal characteristics sw 2888 0 10ka 10k tim hda 10M 20 Continuity ranges Measuring range Open circuit voltage Short circuit current Accuracy at 20 C MIT300 310 320
16. er manual for further information a Range lock Displayed at any time the TEST button is locked in the on position fo Lead nulled Indicates that the test lead resistance has been removed from the test result C2 Battery condition indication Refer to page 18 Fuse blown indicator appears when an instrument fuse has failed Refer to page 19 Test lead connection The Red Black test lead set should be connected to the appropriate sockets on the rear of the instrument marked and respectively Test probes and crocodile clips are supplied for connection to the circuit under test Fused test leads are available as an optional accessory please refer to accessories list at the end of this document Application This instrument may be connected live to earth or between live conductors of systems that have a rated voltage of 600 V a c rms to earth and an installation overvoltage Category III or lower or CATIV applications with a rated voltage of 300 V or less This means that the instrument may be connected to any fixed wiring of a building installation but not to primary supply circuits such as overhead cables To maintain user safety and ensure accurate measurements only use the test leads supplied by Megger Limited CONTINUITY MEASUREMENT MIT300 310 320 330 All continuity measurements are AUTO ranging from 0 00 Q to 100 Q on Digital analogue scale The MIT310A has manual range selection to
17. est Lock siots Range knob Test button amp Teet lead null Setup menu MIT320 amp 330 Backlight On Off Continuity MITS20 amp MIT330 Buzzer amp Front panel caver onb Resistance range folded under MIT3208330 instrument MIT310A Test Lock LED Moving coil ae Test lead null indication Battery check Battery condition Voltage warning LED indication Connection Panel MIT300 Series test lead connections Switch probe Connection Red and Black test lead 320 amp 330 only connections Warning Maximum input USB download Refer to user voltage Lead connection manual 330 only An interlock sliding panel prevents connection of unsafe test lead configurations MIT320 MIT330 only MIT330 Additional Controls Voltage measurement Last Stored Test result data result recall download delete Memory controls Memory control keys STORE Store initiates the storing of a test result LAST NEXT Selects the type of location ie Job distribution board circuit phase etc ESC Aborts a save at any time OK Final operation to save the result A Selects the job db circuit number ie 01 02 03 etc v Lid open closure 1 Open lid by lifting up front panel tab 1 2 Fold away underneath instrument 2 amp 3 and push into retaining slot 4 PREPARATIONS FOR USE ALL INSTRUMENTS Batteries The Megger MIT300 series of instruments are supplied with batteries fitted When batteries becom
18. kaline batteries and my not give much warning before becoming exhausted Warning Always perform a battery test prior to using the instrument to ensure the instrument will function properly LED Indicators Two led indicators show testing status information for test lock and voltage detection Voltage warning If a voltage greater than 50 V exists on the circuit under test and the TEST button is pressed the RED V LED will light and testing will be automatically inhibited Test lead Null MIT310A only Before using the continuity range for the first time the test lead resistance should be zeroed out This ensures any measurement does not include the resistance of the test leads To null the test leads 1 Connect the test leads to the instrument and firmly short both leads together 2 Wait for the reading to stabilise and adjust the lead null knob fay until the display pointer indicates 0 Q 3 Lead null should be checked periodically and at the start of each session to ensure ZERO is maintained or adjusted as necessary Note Lead null can remove up to 0 5 Q of lead resistance Continuity test MIT310A Continuity range extends from 0 00 Q to 2 kQ Ranges are not auto ranging Manual selection of each range is necessary Test currents are 200 mA to 2 Q 20 mA to 20 Q 2 mA to 200 Q 200 pA to 2 KQ To make a continuity measurement 1 Select the continuity range required 2 Connect the test lead
19. mber using keys then press NEXT Hold the key down to scroll quickly through the numbers 3 Select distribution board number b01 02 etc using keys then press NEXT 4 Select circuit number c01 02 etc using keys then press NEXT Wn Select the circuit type R12 RrN Rr2 Rr1 R2 or R1 by pressing the keys then press NEXT 6 Select the phase using keys then press NEXT The screen will display a unique test number which is attached to that particular test 7 Press OK to save the result To store a subsequent result To save the next test under the same location job number distribution board circuit reference etc 1 Make another measurement as described earlier and press STORE 2 The last Job number will be displayed Press OK 3 The unique test number will be displayed Press OK and the result is stored Note The job number distribution board circuit and test type can all be changed before saving a result by selecting the function using the keys To recall the last test result 1 Set the range knob to RCL 2 The last unique test number is displayed 3 Press OK and the test result will be displayed Note Only the last test result can be recalled to the display Storing insulation test results Storing an insulation test result is exactly the same as a continuity test However the circuit type options change to L E L L L N N E Downloading results to a PC 1 Connect the tester to
20. mpletely de energised and isolated before test connections are made 12 To perform an insulation test 1 Turn the instrument On by selecting the desired 250 V 500 V or 1000 V MQ range N Connect the test probes to the isolated circuit under test 3 Press and hold the TEST button allow the display to settle The reading will remain displayed for a few seconds after the push button is released Release the TEST button before removing the test leads to enable the instrument to discharge the circuit under test If the display shows VOLTS wait 5 On completion of testing switch to the OFF position Alternatively auto shut off operates after a period of inactivity For MIT310A see notes on insulation testing page 15 Note To prevent accidental application of 1 kV a warning display will flash 1000 V prior to the start of the first 1000 V test Note 50Hz noise from the circuit under test below 100 pA or 25 V is ignored and will not affect test accuracy Higher levels of noise will cause the default voltmeter to indicate Above 50 V or 200 pA testing is inhibited Test lock The insulation test can be locked on by pressing the lock T whilst holding down the TEST button To disable lock press the TEST or LOCK button Insulation test MO alarm ON OFF MIT320 MIT330 only The buzzer can be enabled or disabled for working in office environments To enable the buzzer 1 Swi
21. ntinuity buzzer mode The continuity buzzer has a fast check which looks for a resistance greater than 1 0 MQ and will buzz when found If a voltage is detected the continuity test will stop the instrument will not be damaged The continuity buzzer will then check for a low resistance path less than 5 or as set on the MIT320 and MIT330 and continue to buzz To perform a continuity buzzer test 1 Set the test range knob to the continuity buzzer a position 2 Connect the test probes to the isolated circuit under test 3 A continuous beep note sounds when the test leads make contact with resistance less than 5 Q and contact is maintained Resistance greater than 5 Q is indicated by a short or intermittent beeping 4 The buzzer visual indicator symbol closes when continuity is detected Setup mode MIT320 and MIT330 only Continuity buzzer threshold adjustable The adjustable buzzer threshold adjustment allows the operator to set the maximum resistance at which the buzzer operates To adjust 1 Switch the MIT320 MIT330 to SETUP The display should flash between CON and 5 00 Q 2 Press and hold down the TEST button 3 The buzzer threshold resistance is displayed This will count down from 5 Q to 1 0 Q 4 When the display reaches the desired value release the TEST button O 5 Press the E button to store the value To select a threshold value above 5 0 Q 1 Switch the MIT320 or MIT330 to SET
22. s to the circuit under test 3 For a single test press and hold down the TEST button 4 Read the resistance from the appropriate range scale To increase battery life release it as soon as possible after a test is complete Continuity buzzer test It is best to lock the test button down press and hold down the test button Press the lock button momentarily Insulation testing Insulation testing is the same as page 13 however the result is only displayed as long as the TEST button is depressed Note If the batteries are exhausted the instrument may not show a needle movement when testing We recommend an occasional insulation test should be performed with the leads shorted together or the battery test mode should be selected to ensure the batteries are in good working condition MIT310A Test lock The TEST button can be locked down to allow continuous continuity or insulation testing To enable the TEST LOCK 1 Press and hold down the TEST button Press the T button momentarily O 2 The TEST LOCK LED amp should light To remove TEST LOCK 1 Press the TEST or LOCK button 15 SP4F SWITCHED ACCESSORY FOR MIT320 MIT330 The SP4F switch probe allows the user to start a test by pressing the TEST button on the probe instead of the instrument This allows for complete hands free testing and increases user safety To use the SP4F probe 1 Connect the SP4F probe to the MIT320
23. tch the instrument to SETUP 2 Repeatedly press the TEST button until the display shows ON OFF 3 Press and hold the TEST button to select ON fi 4 Press the E button to save To disable the buzzer 1 Switch the instrument to SETUP 2 Repeatedly press the TEST button until the display shows RON ON 3 Press and hold the TEST button to select OFF OO 4 Press the 4 button to save MO threshold adjustment MIT320 and MIT3300 only The buzzer threshold adjustment allows the operator to set the resistance above which the buzzer operates The instrument will beep so long as the insulation value measured remains above the threshold value The instrument is supplied with the threshold level set to OFF and the threshold value set to 1 00 MQ To adjust 1 Switch the instrument to SETUP 2 Repeatedly press the TEST button until the display shows RES 3 The initial insulation alarm level is set to 1 00 MQ 4 Press and hold down the TEST button The Threshold limit will decrease from 999 MQ to 1 0 MQ 5 When the display reaches the desired value release the TEST button O 6 Press the 4 button to store the value The instrument will now beep every time an insulation test is performed and the measured value is greater than the threshold value set only if buzzer is enabled Insulation test lock disable Not MIT310A The instrument is shipped with the test lock f
24. tion test Test lock Insulation test MQ alarm ON OFF MIT320 only MQ threshold adjustment MIT320 330 only Insulation test lock disable MIT320 330 only AC DC Voltage measurement Analogue Instrument MIT310A Test lead null Continuity test CANIN DAYW KN amp PR rFP rr OO DO Fre OOo e N N 13 13 13 14 14 14 15 Continuity buzzer test 15 Insulation testing 15 Test lock 13 SP4F Switched optional accessory for MIT320 16 Test result storage MIT330 only 16 Replacing batteries and fuses 18 Low battery warning symbol 18 To replace batteries 18 Fuse replacement user replaceable 19 Preventive maintenance 19 Technical specification 20 Accessories and equipment 23 Repair and Warranty 24 Symbols used on the instrument are A A o Caution risk of electric shock Caution refer to accompanying notes Equipment protected throughout by Double Insulation Class II CE N13117 C Equipment complies with current EU directives Equipment complies with C tick requirements INTRODUCTION Thank you for purchasing the Megger Insulation Tester For your own safety and to get the maximum benefit from your instrument please ensure that you read and understand the following safety warnings and instructions before attempting to use the instruments This user guide describes the operation and functions of the following IT300 Series of insulation and continuity testers T300
25. track the progress of your return on line at www megger com Approved Service Centres A list of Approved Service Centres may be obtained from the UK address on the back page or from Megger s website at www megger com Megger Limited Archcliffe Road Dover Kent CT17 9EN England T 44 0 1 304 502101 F 44 0 1 304 207342 E uksales megger com Megger 4271 Bronze Way Dallas Texas 75237 1019 USA T 1 800 723 2861 USA ONLY T 1 214 333 3201 F 1 214 331 7399 E ussales megger com Megger Z A Du Buisson de la Couldre 23 rue Eug ne Henaff 78190 TRAPPES France T 33 0 1 30 16 08 90 F 33 0 1 34 61 23 77 E infos megger com Megger Pty Limited Unit 1 11 21 Underwood Road Homebush NSW 2140 T 61 0 2 9397 5900 F 61 0 2 9397 5911 E ausales megger com Megger Megger Limited Unit 106 550 Alden Road Markham Ontario L3R6A8 Canada T 1 416 298 9688 Canada only T 1 416 298 6770 F 1 416 298 0848 E casales megger com Megger products are distributed in 146 countries worldwide This instrument is manufactured in the United Kingdom The company reserves the right to change the specification or design without prior notice Megger is a registered trademark Part No 6172 877 V14 09 13 www megger com
26. unction enabled To disable the test lock function 1 Ensure the instrument is switched off 2 Hold down the F button and turn the range knob to MQ 500 V Keep the T button depressed for 10 seconds 3 4 The instrument shall display OFF to indicate the lock function is disabled This setting is permanently stored To re enable the test lock function repeat the above process 13 AC DC VOLTAGE MEASUREMENT If a voltage greater than 2 V a c or d c is present at the terminals the measured voltage is indicated on the display If the fuse is blown the voltmeter will still operate see note 1 For normal voltage measurement 1 Set the range switch to V 2 Connect the test leads to the circuit under test 3 The display will show the voltage across the test leads Note measured voltage should not exceed 600 V phase to earth NOTE 1 When fuse is blown MIT300 MIT330 voltmeter will operate normally when connected to more than 5 volts MIT310A will show approximately 40 of true voltage 14 ANALOGUE INSTRUMENT MIT310A Additional notes Battery Level s Exhausted battery Battery test Battery condition can be checked by rotating the range knob to the battery symbol and pressing TEST button The position of the needle over the taper symbol will indicate battery condition Highest charge to the right Note NiMH or NiCAD rechargeable batteries show a lower charge than al
Download Pdf Manuals
Related Search