Biddle MIT300_UG_V03-MC 电路图.pdf

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1、M MIT300 Series Insulation and Continuity testers USER MANUAL MIT300_UG_en_V03 21/09/2004 2:50 pm Page 1 RadioFans.CN 收音机爱 好者资料库 GSAFETY WARNINGS ISafety Warnings and Precautions must be read and understood before the instrument is used. They must be observed during use. IThe circuit under test must

2、 be switched off, de-energised and isolated before test connections are made when carrying out insulation and continuity tests. ICircuit connections and exposed metalwork of an installation or equipment under test must not be touched. IThe live circuit warning and automatic discharge are additional

3、safety features which may fail and therefore safe working practices must be observed. IThe voltage function will only work if the instrument is functional and switched on. IAfter insulation tests, capacitive circuits must be allowed to discharge before disconnecting test leads. IThe instrument shoul

4、d not be used if any part of it is damaged. ITest leads, probes and crocodile clips must be in good order, clean and with no broken or cracked insulation. IEnsure that hands remain behind guards of probes/clips when testing. INational Safety Authorities may recommend the use of fused test leads when

5、 measuring voltage on high-energy systems. IReplacement 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. IThe battery cover must be in place whilst conducting tests.

6、 2 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 circuit

7、s. Where the assessments show that the risk is significant then the use of fused test leads may be appropriate. NOTE THE INSTRUMENT MUST ONLY BE USED BY SUITABLY TRAINED AND COMPETENT PERSONS. MIT300_UG_en_V03 21/09/2004 2:50 pm Page 2 RadioFans.CN 收音机爱 好者资料库 Insulation testing15 Test Lock15 SP3 Swi

8、tched (optional accessory for MIT320)16 Test result storage (MIT330 only)16 Replacing batteries and fuses18 Low battery warning symbol18 To replace batteries18 Fuse replacement (user replaceable)19 Preventive maintenance19 Technical specification20 Basic and service errors22 Accessories and equipmen

9、t23 Repair and Warranty24 Symbols used on the instrument are: FCaution: risk of electric shock GCaution: refer to accompanying notes tEquipment protected throughout by Double Insulation (Class II) cEquipment complies with current EU directives. Equipment complies with C tick requirements CONTENTS 3

10、Safety warnings4 Introduction2 General description4 Unpacking the carton5 LCD Display6 Front panel (digital instruments)6 Connection panel7 Lid open/closure7 Preparations for use (all instruments)8 Batteries8 Preliminary test lead check8 General operating instructions8 General functions8 Test lead c

11、onnection.9 Continuity measurement (MIT300, 310, 320, 330)10 Test lead Null10 Continuity test (MIT300, 310,320, 330)10 Continuity Buzzer (MIT300, 310, 320, 300)11 Continuity buzzer mode:11 Setup mode (MIT320/330 only)11 Insulation testing - General12 Insulation test12 Test lock13 Insulation test (M

12、alarm ON/OFF (MIT320 only) 13 M threshold adjustment (MIT320/330 only)13 Insulation test lock disable (MIT320/330 only)13 AC / DC Voltage measurement14 Analogue Instrument MIT310A14 Test lead Null 14 Continuity test 15 Continuity buzzer test15 N13117 MIT300_UG_en_V03 21/09/2004 2:50 pm Page 3 RadioF

13、ans.CN 收音机爱 好者资料库 The MIT300 series variants have the following features: MIT300 MIT310 MIT310A MIT320 MIT330 Insulation testing 1 kV Insulation rangeIIII 500 V Insulation rangeIIIII 250 V Insulation rangeIIIII Insulation test full scale999 M999 M999 M999 M 999 M Insulation limit alarm 0.01 M to 1 G

14、II Continuity Voltmeter range (600 V digit)IIII Continuity buzzerIIIII Adjustable buzzer threshold 1 to 20 II Audible buzzer disableII Lead null to 9.0 (0.5 for MIT310A)II0.5II Stored test lead nullIIIII Resistance 10 to 1M resistance rangeII INTRODUCTIONGENERAL DESCRIPTION 4 Thank you for purchasin

15、g 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 fo

16、llowing: MIT300 Series of Insulation and Continuity Testers: MIT300 MIT310 MIT310A MIT320 MIT330 MIT300_UG_en_V03 21/09/2004 2:50 pm Page 4 Unpacking the carton Unpack the carton contents carefully. There are important documents that you should keep for future reference. Please complete the pre-paid

17、 Warranty Card and return it to Megger Limited as soon as possible to help us reduce any delays in supporting you, should the need arise. Carton contents 1 x MIT300 series insulation tester 1 xRed/Black test lead set with clips 8 xAA (LR6) batteries fitted 1 xTest lead case 1 xWarranty card 1 x Cert

18、ificate of test 1 xCalibration certificate 1 x Owners CD manual 1 x Safety warnings 1 xPrinted Quick Start guide 1xUSB lead 5 MIT300 MIT310 MIT310A MIT320 MIT330 Features Locking test buttonIIIII Backlight and rotary switch illuminationsII Voltage warningI Default voltmeterIIII Auto-power-down with

19、defeatIIII Switched test probe connectorII Switched test probeII Results StorageI DownloadingI USBI MIT300_UG_en_V03 21/09/2004 2:50 pm Page 5 6 LCD DISPLAYFRONT PANEL (DIGITAL INSTRUMENTS) MIT300, 310 and 320 MI MIT310A Voltage warning LED Test Lock LED Test lead null Battery check Battery conditio

20、n indication Moving coil Analogue display indication MIT300_UG_en_V03 21/09/2004 2:50 pm Page 6 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 ope

21、ration to save the result. Selects the job, db, circuit number; ie 01,02,03 L etc M Lid open/closure 1. Open lid by lifting up front panel tab (1). 2. Fold-away underneath instrument (2 allow the display to settle. The reading will remain displayed for a few seconds after the push button is released

22、. 4. 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 not

23、es 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 uA or 25 V is ignored and will not affect test accuracy. Higher levels of noise wi

24、ll cause the default voltmeter to indicate. Above 50 V (or 200 uA) testing is inhibited. Test lock The insulation test can be locked on by pressing the lock Lwhilst holding down the TEST button. To disable lock press the TEST or LOCK button. INSULATION TESTING - GENERAL MIT300_UG_en_V03 21/09/2004 2

25、:50 pm Page 12 Insulation test M alarm ON/OFF (MIT320/MIT330 only) The buzzer can be enabled or disabled for working in office environments. To enable the buzzer: 1. Switch the instrument to SETUP. 2. Repeatedly press the TEST button until the display shows RON/OFF. 3. Press and hold the TEST button

26、 to select ON. 4. Press the Lbutton 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. 4. Press the Lbutton to save. M threshold adjustment (MIT320 only) The buzzer th

27、reshold 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 M. To

28、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 M. 4. Press and hold down the TEST button. The Threshold limit will decrease from 999 M to 1.0 M. 5. When the display reaches the desired va

29、lue release the TEST button. 6. Press the Lbutton 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 ship

30、ped with the test lock function enabled. To disable the test lock function: 1. Ensure the instrument is switched off. 2. Hold down the Lbutton and turn the range knob to M 500 V. 3. Keep the Lbutton depressed for 10 seconds. 4. The instrument shall display OFF to indicate the lock function is disabl

31、ed. This setting is permanently stored. To re-enable the test lock function, repeat the above process. 13 MIT300_UG_en_V03 21/09/2004 2:50 pm Page 13 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 volt

32、meter 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 blo

33、wn: MIT300 - MIT330 voltmeter will operate normally when connected to more than 5 volts. MIT310A will show approximately 40% of true voltage. ANALOGUE INSTRUMENT MIT310A Additional notes: Battery Level = Exhausted battery Battery test Battery condition can be checked by rotating the range knob to th

34、e 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 Alkaline batteries, and my not give much warning before becoming exhausted. Wa

35、rning: 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

36、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

37、 test leads. To null the test leads: 1. Connect the test leads to the instrument and firmly short both leads together. 14 AC / DC VOLTAGE MEASUREMENT MIT300_UG_en_V03 21/09/2004 2:50 pm Page 14 15 needle movement when testing. We recommend an occasional Insulation test should be performed with the l

38、eads 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 t

39、he Lbutton momentarily. 2. The TEST LOCK LED Lshould light. To remove TEST LOCK: 1. Press the TEST or LOCK button. 2. Wait for the reading to stabilise and adjust the lead null knobz until the display pointer indicates 0 . 3. Lead null should be checked periodically and at the start of each session

40、to ensure ZERO is maintained, or adjusted as necessary. Note: Lead Null can remove up to 0.5 of lead resistance. Continuity test (MIT310A) Continuity range extends from 0.00 to 2 k. Ranges are not auto-ranging. Manual selection of each range is necessary. Test currents are: 200 mA to 2 , 20 mA to 20

41、 , 2 mA to 200 , 200 A to 2 k. To make a continuity measurement: 1. Select the continuity range required. 2. Connect the test leads 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 r

42、elease 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 a

43、s the TEST button is depressed. Note: If the batteries are exhausted the instrument may not show a MIT300_UG_en_V03 21/09/2004 2:50 pm Page 15 Storing CONTINUITY test results: Results storage has the following structure: 000, 002255= Job number b00, b01, b02 99= Distribution board No. c00, c01, c029

44、9= Circuit number R12, RrN, Rr2, Rr1, R1 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 PURCHAS

45、E 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 LimitedorMegger Archcliffe Road Valley Forge Corporate Centre Dover 2621 Van Buren Avenue Ken

46、t CT17 9ENNorristown PA 19403 England.U.S.A. Tel: +44 (0) 1304 502 243Tel: +1 610 676 8579 Fax: +44 (0) 1304 207 342 Fax: +1 610 676 8625 or an approved repair company. Returning and Instrument for Repair If it is necessary to retun an instrument for repair, a returns Authorisation number must first

47、 be obtained by contacting one of the addresses shown. You will be asked to provide key information, such as the instrument serial number and fault reported when the number is issued. This will enable the Service Department to prepare in advance for the receipt of your instrument, and to provide the

48、 best possible service to you. The Returns Authorisation number should be clearly marked on the outside of the product packaging, and on any related correspondence. The instrument should be sent, freight paid to the appropriate address. If appropriate a copies of the original purchase invoice and of

49、 the packing note, should be sent simultaneously by airmail to expedite clearance through customs. For instruments requiring repair outside the warranty period a repair estimate will be submitted to the sender, if required, before work on the instrument commences. Authorized Distributor: MeterCenter 2046 West Peninsula Circle - Chandler, AZ 85248 Telephone: (480) 659-8351 Toll Free: (800) 230-6008 Fax: (480) 659-8361 Email: SalesMeterC Websites: www.BiddleM - www.MeterC REPAIR AND WARRANTY MIT300_UG_en_V03 21/09/2004 2:50 pm Page 24