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MFT70-US

Multifunction Tester

With On - board memory
User Manual

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Содержание MFT70-US

Страница 1: ...MFT70 US Multifunction Tester With On board memory User Manual...

Страница 2: ...arging 10 To charge the batteries 11 Operation 12 General operation all models 12 Switching on 12 Switching off 12 Backlight 12 Test buttons 12 Test button lock 12 Mode button functions 13 Test inhibi...

Страница 3: ...a measurement 20 Touch voltage display 21 Measurement methods and sources of error 21 Useful information 22 Ground resistance measurement 22 Connection terminals 22 Touch voltage limit 22 Making a mea...

Страница 4: ...32 Ground testing 32 Bluetooth Pairing 33 Bluetooth Pairing PC or Laptop 33 General Information 34 Installation category definitions 34 Safe working practice 34 Cleaning and maintenance 34 Ground resi...

Страница 5: ...switch display window etc are missing Always disconnect the instrument from all systems while batteries are being changed or the fuse replaced Do not replace rechargeable cells in the instrument with...

Страница 6: ...should be connected to the system under test through isolation switches that are rated to handle the likely maximum fault voltages and currents that could be encountered at the installation The isolat...

Страница 7: ...s Maximum 300 V a c CAT IV to Ground 600 V Maximum nominal system voltage of 600 V f Instrument protected by 2 x F2 1000 V 30 kA fuses c Equipment complies with current EU Directives This equipment sh...

Страница 8: ...commercial and industrial wiring Specially designed to comply with modern US International wiring regulations and standards the MFT70 may be used on all single and three phase systems with rated volt...

Страница 9: ...Potential stake P stake resistance exceeds range for accurate measurement Type A GFCI selected Rc RH Current stake C Stake resistance exceeds range for accurate measurement S Type S GFCI Type AC V Gro...

Страница 10: ...change between alkaline and rechargeable batteries When set to NiMH batteries the battery indicator in the display will show NiMH under the battery status symbol as below Feature available on all mode...

Страница 11: ...not attempt to recharge non rechargeable Primary cells Doing so may result in instrument damage and may cause personal injury Ensure ambient temperatures are between 4 C and 40 C while charging the MF...

Страница 12: ...of the rotary knobs to turn back on 2 minute option in Setup refer to Setup options on page 26 Backlight Press the backlight button The backlight will operate for 20 seconds Test buttons The test but...

Страница 13: ...up options on page 26 Test inhibit Each test mode has conditions under which testing will be inhibited as below Insulation Detection of a circuit voltage above 50 V a warning is displayed at 25 V Cont...

Страница 14: ...nector to the L1 terminal and the blue connector to the L2 terminal b For live to ground measurements connect the red test to the L1 terminal and the green connector to the L2 terminal L1 N E L1 N E C...

Страница 15: ...current clamp Megger Current Clamp 1 On the MFT70 set the primary range knob to clamp position 2 Connect to Megger Current Clamp part number MCC1010 to the Megger Current Clamp socket on the MFT 3 Con...

Страница 16: ...omatic testing of the circuit in both directions and the highest measured value being displayed refer to Setup options on page 26 Nulling test lead resistance up to 9 99 ohms W Before starting a conti...

Страница 17: ...en NOTE A resistance of 99 9 k is present NOTE Circuit voltages in excess of 4 V are detected Storing downloading results Once the display shows a value it will automatically be logged into temporary...

Страница 18: ...able limits of 0 5 1 2 5 10 20 50 100 are available This setting is stored even when the instrument is switched off Measurement methods and sources of error Method of measurement The 2 wire lead set m...

Страница 19: ...0 V warning is displayed whenever the 1000 V range is selected for the first time and the TEST button is pressed Insulation test lock To lock an insulation test ON hold down either of the TEST buttons...

Страница 20: ...e Note When testing GFCIs the test mode should be left in AC which is set as default The other modes are not relevant for GFCI testing If another mode is selected unintentionally e g A S S or B then t...

Страница 21: ...age limit Measured touch voltage GFCI Trip time no trip GFCI Type GFCI Test mode Touch voltage is calculated using the nominal trip current of the GFCI x Ground resistance For example GFCI trip curren...

Страница 22: ...m intact Attached Rod Technique ART Additionally they can drive an optional voltage inducing clamp Megger Voltage Clamp which in conjunction with the Megger Current Clamp can be used to make stake les...

Страница 23: ...y not be suitable for continuity testing according to some local regulations Making a measurement three terminal resistance measurement 1 Connect the instrument as below I CAT IV 300V 12 15V 1 2A V El...

Страница 24: ...button the resistance measurement will be continually updated The instrument will perform pre measurement checks the status of which will be indicated on the display The three terminal resistance rea...

Страница 25: ...mentarily with REV on the auxiliary display together with the V clamp symbols 5 Ensure a minimum separation of 100 mm between the Megger Current Clamp and Megger Voltage Clamp 6 Set the left hand rota...

Страница 26: ...N OFF OFF L PE 2Hi Enable Disable high current loop test ON OFF ON L PE 2Lo ON OFF ON RAS GFCI AUTO start ON OFF OFF UL Touch voltage limit 25 V 50 V 60 V 50 V OFF Auto switch OFF in minutes 2 m 20 m...

Страница 27: ...lation test 1000 V 1000 V Flashing warning before 1 kV test VOL 0 L Voltage overload during test GFCI Test trp Supply tripped unexpectedly 50V Test aborted due to danger of exceeding touch voltage lim...

Страница 28: ...L 280V for example Supply voltage is too high L N 48V for example Voltage on terminals is too low for L N loop test L E 48V for example Voltage on terminals is too low for L E loop test or GFCI test F...

Страница 29: ...PHA 001 to 003 Phase number Circuit type In addition the following circuit descriptors are used to identify on which part of the circuit the measurement was made Insulation Symbol Definition L E Live...

Страница 30: ...ck button again to display each of the remaining options Job Distribution Board Circuit Phase and use the Right Lock Right Test buttons to change these values as required 5 To complete the store press...

Страница 31: ...al Blobbing test results In order to Blob test data the Store Mode needs to be set to Bluetooth or internal and Bluetooth Refer to Setup options on page 26 for further details To force a particular te...

Страница 32: ...itted 5 The test results will now appear in the correct box in the certificate open on your PC or mobile device GFCI testing 1 Perform a GFCI test as described previously 2 Press and hold the Bluetoot...

Страница 33: ...lay the bt setup option 5 To enter the Bluetooth pairing mode you will now need to push and hold down the left hand Bluetooth Lock button until you see two oscillating chevrons appear on the display a...

Страница 34: ...ted the functions of the instrument are proven to be working This is to ensure that a hazardous condition is not mis reported by the instrument as being safe For example By checking the voltage range...

Страница 35: ...e potential stake at a distance of approximately 62 between the electrode under test and the current stake i e at A 0 62 x B Earth electrode under test C H P S X E V I Potential stake Current stake A...

Страница 36: ...classic three terminal resistance measurement The stake less test method using both Megger Voltage Clamp and Megger Current Clamp can be used to obtain a measurement for the electrode under test A def...

Страница 37: ...9 9 5 2 digits 100 to 99 9 k EN61557 range 0 1 to 99 9 k Open circuit voltage 5 V 1 V Test current at 200 mA 0 to 2 200 mA 2 Test current at 15 mA 0 to 2 15mA 2 Max Service error 12 2 digits GFCI test...

Страница 38: ...ge range 25 C to 70 C Humidity Operating humidity 90 R H at 40 C max Altitude 2000 m to full safety specification Weight 1000 g 10 including batteries but excluding test leads accessories and carry ca...

Страница 39: ...ide 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 n Model e g MFT70 n Serial number to...

Страница 40: ...Inc and is used under licence MFT70_UG_us V01 28 March 2018 9 38 AM www megger com Megger Limited Archcliffe Road Dover Kent CT17 9EN ENGLAND T 44 0 1 304 502101 F 44 0 1 304 207342 Megger GmbH Obere...

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