MFT1800 series Multifunction testers User Guide
This document is copyright of: Megger Limited, Archcliffe Road, Dover, Kent CT17 9EN. ENGLAND T +44 (0)1304 502101 F +44 (0)1304 207342 www.megger.com Megger Limited reserves the right to alter the specification of its products from time to time without notice. Although every effort is made to ensure the accuracy of the information contained within this document it is not warranted or represented by Megger Limited to be a complete and up-to-date description.
This manual supersedes all previous issues of this manual. Please ensure that you are using the most recent issue of this document. Destroy any copies that are of an older issue. Declaration of Conformity Hereby, Megger Instruments Limited declares that radio equipment manufactured by Megger Instruments Limited described in this user guide is in compliance with Directive 2014/53/EU.
Contents 1. Safety............................................................................................................................................. 8 1.1. Safety Warnings........................................................................................................................................ 8 1.2. Live earth safety precautions................................................................................................................... 9 1.3.
6. 500 Insulation resistance V ............................................................................................................... 24 6.1. Making an INSULATION measurement................................................................................................... 24 6.2. Insulation test lock................................................................................................................................... 25 6.3. Measurement methods and sources of error.............
10. Earth resistance measurement................................................................................................... 49 10.1. Connection terminals............................................................................................................................. 49 10.2. Touch voltage limit................................................................................................................................. 49 10.3.
19. Specifications............................................................................................................................... 64 19.1. Accuracy.................................................................................................................................................. 64 19.1.1. Insulation test...................................................................................................................................... 64 19.1.2. Continuity / Resistance..
Safety 1. Safety 1.1 Safety Warnings Safety warnings and precautions must be read and understood before the instrument is used. They must be observed during use. The circuit under test must be switched off, de-energised and isolated before test connections are made when carrying out insulation and continuity tests.
Safety 1.2 Live earth safety precautions A ‘Live’ earth is one that carries current from the mains supply, or could do so under fault conditions. The following warnings apply in addition to those listed previously: All persons involved must be trained and competent in isolation and safety procedures for the system to be worked on. They must be clearly instructed not to touch the earth electrode, test stakes, test leads, or their terminations if any ‘Live’ earths may be encountered.
Safety 1.3 Symbols used on the instrument This section details the various safety and hazard icons on the instruments outer case. Icon Description G Caution: Refer to accompanying notes Maximum 300 V AC CAT IV to earth > 600 V f c Maximum nominal system voltage of 600 V Instrument protected by 2 x F2 1000 V 30 kA fuses Equipment complies with current EU directives Equipment complies with current UK legislation Do not dispose of to landfill, sewage systems or by fire.
Introduction 2. Introduction Congratulations on your purchase of a genuine Megger Multifunction tester. The MFT1800 series Multi-function tester is a compact instrument designed to perform all of the functions required by the electrical contractor to fully test domestic, commercial and industrial wiring. Specially designed to comply with U.K.
Introduction 2.1.2. Display NOTE : Some features detailed within this user guide are model dependent. Not all features appear on all models 2.1.3.
Introduction 2.1.4. Waste electrical and electronic equipment WEEE The crossed out wheeled bin placed on Megger products is a reminder not to dispose of the product at the end of its life with general waste. Megger is registered in the UK as a producer of electrical and electronic equipment. The Registration No is WEE/ HE0146QT 2.1.5. Battery and fuse location, fitting and replacement Battery type: 6 x 1.
Introduction Connect the 12 V DC plug of the charger to the socket on the front of the MFT marked WARNING : Whenever battery cells are being recharged, there should be no connections to the instrument terminals and the instrument should be switched off. WARNING : Do 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 ºC and 40 ºC while charging the MFT.
Operation 3. 3.1 Operation General operation – all models 3.1.1. Switching on Turn the rotary knob away from the off position. The instrument will perform internal self tests then display the appropriate test screen, depending on the position of the function knobs. 3.1.2. Switching off Turn the primary function knob to the OFF position. The instrument will automatically turn itself off after 20 minutes* of inactivity. Press any button or turn either of the rotary knobs to turn back on.
Operation 3.2 Mode button functions The function of the mode button is dependent on the test function selected: Test selected Function Options Comments Temperature requires suitable transducer V / mV ºC Volts (mv model specific) Continuity Buzzer Buzzer ON Buzzes on <2 Ω RLO ENABLE/DISABLE Buzzer OFF May be changed in SETUP. Refer to “11. Setup options” on page 53. Insulation RSIO Buzzer Buzzer ON Buzzes on <1 MΩ Buzzer OFF May be changed in SETUP.
Operation 3.3 Test inhibit Each test mode has conditions under which testing will be inhibited, as below: 3.3.1. Insulation Detection of a circuit voltage above 50 V (a warning is displayed at 25 V) 3.3.2. Continuity Detection of a circuit voltage above that used by the instrument will inhibit testing 3.3.3. Earth loop impedance Touch voltage exceeds 50 V (or 25 V depending on instrument configuration) Supply voltage over range or under range Supply frequency out of specification 3.3.4.
Voltage, frequency, current and temperature measurement 4. Voltage, frequency, current and temperature measurement 4.1 Making a voltage measurement 1. Set the Main rotary range knob to volts (The position of the right hand rotary range knob does not matter) 2. Using two test leads, connect test leads to the L1 (+ve) and L2 (-ve) terminals L1 L2 L3 N E L1 L2 L3 N E OR if Using the Mains plug Lead SAI10: 1.
Voltage, frequency, current and temperature measurement 4.2 Frequency measurement 1. Automatically displayed when connecting to a live circuit as per 4.1 4.3 Phase rotation Display of Phase rotation is Automatic when all three test leads are connected to the 3 phase supply as below: 1. Set the main rotary range knob to volts (The position of the right hand rotary range knob does not matter) 2. Using three test leads, connect test leads to the L1 to Phase1, L2 to Phase 2 and L3 to Phase 3.
Voltage, frequency, current and temperature measurement 4.6 Switch probe In the V/mV/ºC mode all measurements except temperature can be made with the remote switch probe. Tests are automatic and do not require the test button to be pressed. L1 L2 L3 N E 1. Connect the switch probe to the switch probe socket. The probe replaces the standard RED test lead and can now be used as a normal test probe. 20 MFT1800 series www.megger.
Continuity / resistance measurement 5. Continuity / resistance measurement IMPORTANT The continuity test will auto-range from 0.01 Ω to 99.9 kΩ. Circuits up to 2 Ω will be tested at >200 mA. To change the test current, go to “11. Setup options” on page 53. The continuity test is automatic. The test starts as soon as the leads are connected to a circuit. The TEST button is ONLY used to null the lead set. WARNING : Prior to any continuity testing, ensure the circuits under test are isolated and not live.
Continuity / resistance measurement 5.2 Making a CONTINUITY measurement 1. Set the Primary (Left) range knob to the position). W range. (The position of the right hand rotary range knob must not be in 2. Connect two test leads to the L1 (+ve) and L2 (-ve) terminals on the instrument. A continuity measurement is made automatically. L N E g NOTE : Measurements are prevented when: A resistance of > 99.9 kΩ is present Circuit voltages in excess of 4 V are detected. 5.
Continuity / resistance measurement 5.5 Switch probe (SP5) In the CONTINUITY/RESISTANCE mode all measurements can be made with the remote switch probe (SP5). Tests are automatic and do not require the TEST button to be pressed. 1. Connect the switch probe to the switch probe socket L1 (+ve). The switch probe replaces the standard RED test lead. Test as in “5.2 Making a CONTINUITY measurement” on page 22. 5.
Insulation resistance 6. Insulation resistance 500 V NOTE : IMPORTANT The insulation test is protected by a live circuit warning. Detection of a voltage over 50 V will inhibit testing. This applies whether or not the insulation test is locked on. 6.1 Making an INSULATION measurement 500 1. Set the left hand rotary range knob to the V insulation test voltage required: 2. Connect two test leads to the L1 (+ve ) and L2 (-ve) terminals on the instrument. L1 L2 L3 N E 3.
Insulation resistance 6.2 Insulation test lock To lock an insulation test ON, hold down either of the TEST buttons followed by either of the RED LOCK buttons. To release the “Locked on” insulation test, press the TEST button. WARNING : The test voltage will be permanently present on the test probes or crocodile clips when in the locked position. WARNING : Auto discharge - Auto discharge facility automatically and safely discharges the circuit at the completion of an insulation test.
Loop impedance testing 7. Loop impedance testing NOTE : IMPORTANT This measurement requires both selector knobs to be set to the Loop testing mode (GREEN RANGES). This is a live circuit test. All precautions relevant to working on live circuits, to ensure the safety of the operator and any other personnel should be in place. Overview of the LOOP IMPEDANCE test A Loop impedance test is the measurement of the impedance of a circuit whilst the circuit is electrically live.
Loop impedance testing Test Options in L-PE mode: In L-PE mode the MFT1800 series offer 3 types of loop test: 3Lo – A 3-wire low current loop impedance test. This test requires all three connections. Where to use: For making L-E measurements on circuits where all three conductors are available AND the Phase – Earth circuit is RCD protected. Requires all three test leads to be connected. 2Hi – A 2-wire high current test. A fast 3-4 second test using high test currents.
Loop impedance testing 7.1.2. L-N or L-L circuits L1 E N L-N (or L-L) selected Test performed Test options in L-N (L-L) mode In L-N (L-L) mode the MFT1800 series offers one type of loop test: 2Hi – A 2-wire high current test. A fast 3-4 second test using high test currents. Where to use: On ALL circuits except Phase – Earth measurements on RCD protected circuits. 7.1.3. Z, Zmax, Zref and R1+R2 (MFT1721) The right range knob has additional options.
Loop impedance testing 2. Press the Function key <-> to select the “2Hi” mode. The RCD will not trip, so there is no need to use the 3Lo and 2Lo modes. 3. Connect test leads as below, with the Red test lead connected to the L1 (Red terminal on the MFT and the Green test lead connected to the Green (L2) terminal. L N E MCB RCD g 4. Press TEST to start the test sequence. This can be automated in SETUP so the test starts when contacting the circuit. See “11. Setup options” on page 53. 5.
Loop impedance testing 3. Connect test leads as below, with the Red test lead connected to the Red (L1) terminal on the MFT and the Green test lead connected to the Green (L2) terminal. L L N E N E MCB MCB g g The Blue (L3) test lead can be connected to enable “reverse polarity” warnings L N E MCB g 4. Press the Function key to select the “2Hi” mode. 5. Press ‘TEST’ to start the test sequence. This can be automated in SETUP so the test starts when contacting the circuit. See “11.
Loop impedance testing 2. Connect test leads as below, with the Red test lead connected to the Red (L1) terminal on the MFT, the Green test lead connected to the Green (L2) terminal and the Blue test lead to the Blue (L3) terminal. L L N E N E MCB RCD MCB RCD g g 3. Ensure the display is in the “3Lo” mode. If not, press the function button to select “3Lo”. 4. Press ‘TEST’ to start the test sequence. This can be automated in Setup so the test starts when contacting the circuit. See “11.
Loop impedance testing 3. Press the Function key to select the “2Lo” mode. 4. Press TEST to start the test sequence. 5. On completion of the test, the display will show the loop resistance on the large display segments, and the fault current on the small display segments. 7.3 Phase to Neutral (all models) or Phase to Phase testing NOTE : Only the “2Hi” mode is available on this range. 1. Set the LEFT rotary range knob to the L-N L-L range. 2.
Loop impedance testing 7.4 Prospective Fault Current and Short Circuit calculation (PFC & PSCC) The prospective fault current and short circuit current of a circuit is automatically calculated when making a loop impedance test.
Loop impedance testing 7.5 Confidence MeterTM for non-trip (3Lo) loop impedance tests. 7.5.1. Display information 3Lo (3 wire non-trip) Mode indicator Confidence Meter™ Function Confidence meter Units of measurement Test “in progress” warning Noise detected Standard non-trip loop impedance mode test indicator Non-trip loop impedance test mode for circuits with Type B RCD Variable test results in a Loop Impedance test are usually a result of electrical noise on the circuit during the test.
Loop impedance testing The display will show , which indicates the suitability for use on circuits protected by a Type AC or a Type A RCD, or RCBO. If the RCD on the circuit is a Type B, press and hold until the display shows (Type B RCD). NOTE : If unsure of the RCD type use Type B setting. 3. Press TEST. The display will show the start of a Loop Impedance confidence test, followed by an initial value of loop impedance: > then > Figure 5.
Loop impedance testing 7.6 Measurement methods and sources of error Method of measurement During a loop test the instrument measures the difference between the unloaded and loaded supply voltages. From this difference it is possible to calculate the loop resistance. The test current will vary from 15 mA to 5 A, depending on supply voltage and the loop resistance value. The volt drop from a 15 mA load is exceptionally small, consequently the instrument performs many measurements automatically.
Residual Current Device (RCD) or Ground Fault Current Interrupt (GFCI) testing 8. Residual Current Device (RCD) or Ground Fault Current Interrupt (GFCI) testing NOTE : The MFT1800 series can perform the following RCD tests: 1/2I Non-tripping test at half the rated RCD trip current for 2 seconds, during which the RCD should not trip I Tripping test at the rated RCD trip current.
Residual Current Device (RCD) or Ground Fault Current Interrupt (GFCI) testing The characteristics of each RCD type is detailed below: RCD Type Description AC A S B Operate with AC residual earth currents only. Operate with AC and pulsed DC residual earth currents. Selective RCD Operate with AC Operates on type AC with time delay or type A with time delay Symbol used S also S Application General purpose protection of Sinusoidal AC supplies. Protects against AC and pulsed DC (rectified AC).
Residual Current Device (RCD) or Ground Fault Current Interrupt (GFCI) testing 8.3 ½ x I RCD current rating (No-trip test) 1. Set the LEFT rotary range knob to the 1/2 I RCD test range. 2. Set the RIGHT rotary range knob to current rating of the RCD under test 30 = 30 mA etc. Ensure the display shows 0º in the display (see below): 3. Connect the instrument Phase (L1) and Earth (L2) terminals to the RCD phase and Earth terminals (or to the phase and earth of the circuit the RCD is protecting).
Residual Current Device (RCD) or Ground Fault Current Interrupt (GFCI) testing 8.4 1 x I RCD current rating (Tripping test on 30 mA RCD) 1. Set the LEFT rotary range knob to the I RCD test range. 2. Connect the instrument as in 8.3. See 8.3 on page 39 3. Press the mode button to select 0º. 4. Press the TEST button.
Residual Current Device (RCD) or Ground Fault Current Interrupt (GFCI) testing 8.5 2 x I RCD Current Rating (Tripping test on 30mA RCD) – MFT1825 & 1835 ONLY 1. Repeat the test sequence in 8.4 but with the LEFT rotary range knob to the 2I RCD test range. mode button to select 0º. 2. Press the 3. Press the TEST button. Touch voltage limit Measured touch voltage RCD Trip time RCD Type RCD Test mode 4. Press the X mode button to select 180º. 5. Repeat the above test.
Residual Current Device (RCD) or Ground Fault Current Interrupt (GFCI) testing 8.7 Ramp test The RCD trip current is measured by applying a test current of half the rated trip current and increasing this every 300 ms (or 500ms for type S RCDs) from 30% to 110% of the RCD current rating. When the RCD trips, the current flowing is recorded and displayed in mA. Making a measurement 1. Select the appropriate RCD rated current on the right hand rotary switch 30 = 30 mA etc. 2.
Residual Current Device (RCD) or Ground Fault Current Interrupt (GFCI) testing 8.10 Type B (Pure DC) RCD test (Not MFT1815) ‘Type B’ RCDs are sensitive to pure DC fault currents, as well as pulsed AC and ordinary AC fault currents. First they are tested as Type A then Type B, using a pure DC test current. Type ‘B’ RCD’s are only tested on the 1xI range. The result displayed in milli-seconds (ms). 1. Test the RCD in ‘Type A’ mode for 1/2xI , 1xI and 5xI if it is a 30 mA RCD.
Residual Current Device (RCD) or Ground Fault Current Interrupt (GFCI) testing 8.11 Variable RCDs (not MFT1815) 1. To test an RCD with a variable trip current, select the 2. Press the MODE button to select the VAR option on the secondary (right) range knob. symbol. 3. Use the UP and DOWN arrows on the right hand TEST and LOCK buttons to set the tripping current to match that on the variable RCD.
Residual Current Device (RCD) or Ground Fault Current Interrupt (GFCI) testing 8.13 3 Phase RCD testing The MFT1800 series is designed to test RCDs on 3 phase installations. To test RCDs in a 3 phase system each RCD is tested as a single RCD, from Phase to earth. As described in “8.1 Making an RCD measurement” on page 38 to “8.6 5 x I RCD current rating (Tripping test on 30 mA RCD)” on page 41. Where no earth is available, the upstream/downstream method can be used.
Residual Current Device (RCD) or Ground Fault Current Interrupt (GFCI) testing If using the 1/2xI, 2xl or 5xI test ranges, the touch voltage will still be displayed for 1xI test current, as per IEC 61557-6. 2xl and 5xI can create real touch voltages during the tests that are higher than the displayed value. If this voltage exceeds the touch voltage limit (UL) the test will be stopped.
Testing of Electric Vehicle Charge Point RCD’s (MFT1845+ only) 9. Testing of Electric Vehicle Charge Point RCD’s (MFT1845+ only) 45+ EV Figure 8: Switch settings To test an Electric Vehicle charger (EV) RCD. The sequence will automatically run the following in Auto EV mode:EV Type AC B ½ x I at 0° X ½ x I at 180° X 1 x I at 0° X 1 x I at 180° X 5 x I at 0° X 5 x I at 180° X DC RAMP 0° X DC RAMP 180° X EV RCD Table 1.
Testing of Electric Vehicle Charge Point RCD’s (MFT1845+ only) During the test sequence: The 1xI, 5xI and DC Ramp will trip the RCD. Some EV charge points will auto-reset the supply voltage each time the RCD trips. In this case the MFT will automatically proceed to the next test. Older EV charge points do not always reset automatically. In this case, the charge point will need to be reset manually.
Earth resistance measurement 10. Earth resistance measurement The Megger MFT family of test instruments offer a unique solution to the measurement of earth or ground electrode (rod) supporting 2 and 3 wire measurements: The MFT1835 and MFT1845+ can use an optional current clamp (MCC1010) to measure electrode (rod) resistance without disconnection, leaving the installation earthing system intact (Attached Rod Technique, ART).
Earth resistance measurement 2. Set the rotary selector switch to the 2P position. 3. Press and release the TEST button. The instrument will perform pre-measurement check, the status of which will be indicated on the display. The twoterminal resistance reading will be displayed NOTE : The test voltage used to make the two-terminal resistance reading is AC and may not be suitable for continuity testing according to some local regulations. 10.
Earth resistance measurement 10.5 Making a measurement – Three terminal resistance measurement using ART 1. Connect the instrument as BELOW. Position the MCC1010 below the point where the Green Lead is attached to the Earth Conductor. In practice the MCC1010 can be positioned directly on the Electrode under test, at a point below where the green Lead is attached to the the Earth conductor. 12-15V CAT IV 300V 1.2A Current stake H E I S Potential stake 2.
Earth resistance measurement 10.6 Two-clamp stake-less measurement (MFT1835 and MFT1845+ only) Before making a stake-less measurement, please follow the procedures contained in the calibration section of the MCC1010 User Guide. 12-15V 1.2A CAT IV 300V H V E I S Electrode under test 1. Ensure the rotary selector switch is in the OFF position. 2. Connect the instrument as shown above. 3.
Setup options 11. Setup options The Setup options allow the MFT to be configured to best suit the type of testing to which it will be used. To enter Setup, right (secondary) range knob to Setup. Set the left (primary) range knob to any function other than OFF. The display will show VER and the software version number.
Warning messages 12. Warning messages The following warning messages may be displayed during the testing process. Characters which appear in the aux (small) digit field on the display are shown here in a slightly smaller font size. 12.1 Startup warnings “UNC” 12.2 -Instrument is un-calibrated Battery “bAt” -Low battery 12.3 Battery charger “bAt CHA” -Battery charging “bAt FUL” -Battery fully charged 12.4 Fuse warning “FUS” -Fuse blown. 12.
Warning messages 12.9 RCD range selection errors “ERR >1000 mA” -Requested current is >1000 mA. “ERR - - -“ + Type A -In Type A mode -Instrument has been set for Type A test, but Type A test is not valid with this setting. “ERR - - -“ + Type B -In type B mode - Instrument has been set for Type B test, but Type B test is not valid with this setting. “ERR - - -“ + Type S breaker symbol -Instrument has been set for Type S test, but Type S test is not valid with this setting.
Appendix A – Sending, Storing, Deleting and Recalling Test Results (MFT1835 and MFT1845+) 13. Appendix A – Sending, Storing, Deleting and Recalling Test Results (MFT1835 and MFT1845+) Test results can be stored in the MFT, or downloaded immediately to a Bluetooth® compatible device, or both. See “11.
Appendix A – Sending, Storing, Deleting and Recalling Test Results (MFT1835 and MFT1845+) Storing Test Results in the internal memory NOTE : Note that in order to store test data, the Store Mode needs to be set to internal or internal and Bluetooth®. See “11. Setup options” on page 53. 1. Perform the desired test as described previously. 2. Press and release the Bluetooth® (Lock) button to display the first option.
Appendix A – Sending, Storing, Deleting and Recalling Test Results (MFT1835 and MFT1845+) Sending stored test results via Bluetooth® 1. Run Megger Download Manager 2. Using the appropriate driver, follow the on-screen instructions. Sending individual (Blobbing) Test Results Note that in order to Blob test data, the Store Mode needs to be set to Bluetooth or Internal and Bluetooth. See “11. Setup options” on page 53.
Appendix A – Sending, Storing, Deleting and Recalling Test Results (MFT1835 and MFT1845+) Loop testing (L-L/L-N) 1. Perform a Loop L-L/L-N test as described previously. 2. Press and hold the Bluetooth® (Lock) button to display the first option. Release button when L-N displayed. 3. Use the Right Lock / RIGHT TEST buttons to scroll through the options until the one you need is reached (L-N or L-L). 4. Press the Bluetooth® (Lock) button to send the test result to your PC or mobile device.
Appendix B – Downloading data via Bluetooth® (MFT1835 and MFT1845+) 14. Appendix B – Downloading data via Bluetooth® (MFT1835 and MFT1845+) Bluetooth® Pairing (PC or Laptop) 1. Turn your MFT ‘on’ to any setting, and turn the smaller dial to the settings (‘spanner’) position to enter the setup mode. 2. Press the button on the MFT until you see ‘StR’ appear on the display. At this point you should ensure that ‘bt’ is displayed in larger letters on the main part of the MFT’s display.
Appendix C - Installation category definitions 15. Appendix C - Installation category definitions IEC 61010-2-030 defines measurement categories II to IV relating to transient over-voltages and locations within electrical installations. Examples of electrical installation category rating are: Category II - a mains socket outlet, Category III - the wiring between the socket outlets and the consumer unit, Category IV - the supply to the consumer cut-out from the distribution network transformer.
Appendix F - Earth resistance testing – Basic principles 18. Appendix F - Earth resistance testing – Basic principles 18.1 F.1 Principle of operation (three-terminal resistance measurement) The classic “fall of potential” test is used to accurately measure the resistance of an earth electrode using auxiliary stakes driven into the soil, which form a circuit for the test current injection and voltage measurement as used for the two-terminal method.
Appendix F - Earth resistance testing – Basic principles 18.2 F.2 Principle of operation (three-terminal resistance measurement using ART) The classic three-terminal test method has a disadvantage, namely that the electrode under test must be disconnected from the system it is supposed to protect in the event of a power system fault. The reason for this is that the injected test current will take all possible routes to ground and not all of it will necessarily flow through the electrode under test.
Specifications 19. Specifications 19.1 Accuracy 19.1.1. Insulation test Specfication Detail 1000 Volts 10 kΩ - 999 MΩ ±3% ±2 digits 500 Volts. 10 kΩ - 500 MΩ ±3% ±2 digits >500 MΩ ±10% ±4 digits 250 Volts. 10 kΩ - 250 MΩ ±3% ±2 digits >250 MΩ ±10% ±4 digits 100 Volts. 10 kΩ - 100 MΩ ±3% ±2 digits >100 MΩ ±10% ±4 digits EN61557 range: 10 kΩ - 999 MΩ (1000 V range) Voltage display: ±3% ±3 digits ±0.5% of rated voltage Max service error: ±15% ±2 digits. Short circuit current: 1.
Specifications 19.1.5. RCD test: Specfication Detail Intrinsic current accuracy: No trip test: (1/2xI) –10% to 0% Trip test: (1xI, 2xI and 5xI) +0% to +10%. Ramp test current: ±5% ±1 digit Trip time: ±1% ±1 ms Programmable step increments: 10 mA to 50 mA – 1 mA steps. 50 mA to 500 mA – 5 mA steps 500 mA to 1000 mA – 10 mA steps. Supply: 48 V - 280 V (45 Hz to 65 Hz) Max service error: ±10% ±2 digits 19.1.6.
Specifications 19.1.10. mV Sensor input (NOT MFT1711 or MFT1721) Specfication Detail Including temperature (third party module) ±1.0% ±2 digits Range 0.0 mV to ±199.9 mV dc Resolution 0.1 mV 19.1.11. Internal memory (Not MFT1711 or MFT1721) Specfication Detail Capacity 1000 results Bluetooth communication ® 19.1.12.
Accessories 20.
Repair and Warranty 21. 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.
Repair and Warranty www.megger.
Local Sales office Megger Limited Archcliffe Road Dover Kent CT17 9EN ENGLAND T. +44 (0)1 304 502101 F. +44 (0)1 304 207342 Manufacturing sites Megger Limited Megger GmbH Megger USA - Valley Forge Archcliffe Road Weststraße 59 400 Opportunity Way Dover 52074 Aachen Phoenixville, PA 19460 Kent T. +49 (0) 241 91380 500 USA CT17 9EN E. info@megger.de T. +1 610 676 8500 F.
