Megger MFT1741 Multifunction Tester

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  • 3-wire loop test Confidence Meter assesses reading reliability
  • Advanced loop impedance hardware adjusts for noise & cancels out RCD uplift
  • Comprehensive testing capabilities for electrical installations according to BS7671

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  • Description

    Megger MFT1741 Multifunction Tester

    The Megger MFT1741 Multifunction Tester is the most advanced model in the Megger MFT1701 range, building on the impressive capabilities of the MFT1731. In particular, it boasts a new confidence meter which indicates the reliability of a reading and enhanced loop testing hardware which negates the effects of RCDs on loop impedance values. As with other instruments in the MFT1701 range, the tester is ideal for use on residential, commercial and industrial low voltage installations for certifying systems in accordance with BS7671 and Part P of the building regulations. With loop impedance readings after just four seconds, the MFT1741 has the fastest and most accurate no-trip loop testing procedure on the market.

    Patented Confidence Meter

    The advanced three-wire no-trip loop impedance test on the Megger MFT1741 is extremely useful for when RCDs or RCBOs prevent the use of high current two-wire tests as regular no-trip tests are susceptible to interference from noise and harmonics. The tester automatically detects and compensates for such interference after performing the initial loop test, thus enabling stable, repeatable loop tests on noisy circuits. This compensation is tracked by the contraction of the Confidence Meter arc displayed above the reading as the figure is adjusted. If the arc fails to totally contract, this suggests that the final reading is likely to be unreliable whilst a complete contraction indicates high reliability. The Megger MFT1741’s Confidence Meter therefore lessens the need for repeat readings of earth loop impedance by confirming when a reading is very reliable. If the arc shows a low reliability level, the user can take steps to improve the reading such as bypassing RCDs or taking repeat readings.

    Enhanced Loop Test

    The second main innovative feature of the Megger MFT1741 is the advanced loop testing hardware that negates the effects of RCD impedance uplift. Testing through RCDs can often produce overly high loop impedance readings because of resistance in the coil of some RCDs and normal MFTs cannot distinguish between the two. The three-wire test function on the MFT1741 uses a variety of test currents and measurement methods to prevent skewed readings due to RCDs. It is equally adept testing through 10mA devices as it is through 30mA devices and can even perform no-trip tests through Type B RCDs, resulting in improved versatility and accuracy.

    Comprehensive Testing Capabilities

    Aside from its patent-pending confidence meter and enhanced loop impedance test, the Megger MFT1741 also performs a full range of tests for accurately verifying new or repaired electrical installations. These functions include continuity testing at 15mA and 200mA; insulation resistance testing at 100V, 250V, 500V and 1000V; RCD testing (ramp, manual and auto); true RMS voltage measurement; and two/three pole earth testing. It is even capable of ART and stake-less testing although additional accessories are required. B-type and three-phase RCS can be tested with this instrument.

    Readings for all tests are shown on the Megger MFT1741’s backlit LCD display in both digital and analogue format and it is very easy to select the appropriate function thanks to the two clearly-labelled dials. The MFT benefits from intuitive operation and can store results to its internal memory which can then be downloaded using supplied Megger Download Manager which is provided as standard with the instrument. Data transfer is carried out using the tester’s wireless Bluetooth connectivity. Results can be further managed by optional Megger Powersuite Lite software.

    The Megger MFT1741 is sturdily built with protective rubber casing that gives the tester an IP54 water and dust ingress protection rating. It has test and lock buttons on each side for added practicality and comes supplied with a wide range of basic accessories including test leads, probes, crocodile clips, mains plug test lead, remote rest probe, calibration certificate and carry case.

    Megger part number: 1009-986

    Key Features

    • Patent-pending Confidence Meter
    • Evaluates reading reliability on screen
    • Reliable, repeatable loop tests in noisy conditions
    • Approved loop testing hardware negates RCD uplift
    • Continuity test: 15mA, 200mA
    • Insulation resistance test: 100V, 250V, 500V, 1000V
    • Two- and three-wire loop testing
    • Ramp, manual and auto RCD test (A, S, B, 3-phase)
    • True RMS voltage, frequency and phase rotation
    • Earth testing with 2 + 3 pole tests

    Megger MFT Comparison Table

     MFT1711MFT1721MFT1731MFT1731 OnsiteMFT1741
    200mA Continuity Test
    15mA Continuity Test  
    Insulation Resistance Test 250V, 500V & 1000V 100V, 250V, 500V & 1000V 100V, 250V, 500V & 1000V 100V, 250V, 500V & 1000V 100V, 250V, 500V & 1000V
    RCD Test (AC, A & S Types)
    RCD Test (B Type DC Current)  
    Auto RCD Test
    RCD Ramp Test
    RCD (3 phase)  
    Loop Test (2 & 3 Wire Anti-Trip)
    Loop Test Confidence Meter        
    Loop Test Compensation for RCDs        
    Line Test  (L-L)   ✔ 
    Loop Test R1+R2 Calculation        
    Earth Test (2 & 3 pole)     ✔ (Requires accessory)
    Earth Test (ART & stakeless)     ✔ (Requires accessory) ✔ (Requires accessory) ✔ (Requires accessory)
    Phase Rotation  
    Download Memory    
    Software Included        
    Leakage Current   ✔ (Requires accessory)  ✔ (Requires accessory)  ✔ (Requires accessory)  ✔ (Requires accessory) 
    Rechargeable    
  • Specification

    Insulation test

    • Output voltage: -0% +20% at rated load or less
    • Voltage display: ±3% ±3 digits ±0.5% of rated voltage
    • Short circuit current: 1.5 mA nominal test current
    • Test current on load: 1 mA at min pass values of insulation

    Insulation accuracy

    • 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

    Resistance and continuity

    • 0.01 Ω ~ 99.9 Ω: ±2% ±2 digits
    • 100 Ω ~ 99.9 kΩ: ±5% ±2 digits
    • Open circuit voltage: 5 V ±1 V
    • Test current: (0 Ω ~ 2 Ω) / 205 mA ±5 mA / 15 mA ±5 mA (user selectable)

    Loop test

    • Live to earth/neutral supply: 48 V ~ 280 V (45 Hz ~ 65 Hz)
    • Live to live supply: 48 V ~ 500 V†† (45 Hz ~ 65 Hz)
    • L-N/L-L tests: ±5% ±5 digits

    L-E tests †

    • 0.1 Ω ~ 39.9 Ω: ±5% ±5 digits ± noise margin
    • 40.0 Ω ~ 1000 Ω: ±10% ±5 digits
    • Display range: 0.01 Ω ~ 1000 Ω
    • Live to earth PFC range: 20 kA
    • Live to live PSCC range: 20 kA

    † Reference conditions apply
    †† MFT1711 280 V
    For test environments see service data

    RCD tests

    • Supply up to 100 mA: 48 V ~ 480 V** (45 Hz ~ 65 Hz)
    • Supply up to 1 A: 48 V ~ 280 V
    • RCD type: Type AC, A, S, Type B (pure dc)
    • No trip test (1/2xI): –10% ~ –0%
    • Trip test (1xI, 2xI & 5xI): +0% ~ +10%
    • Ramp test Touch voltage (0 ~ 253 V): +5% +15% ±0.5 V
    • Trip time: ±1% ±1 ms
    • Trip current: ±5%

    Step increments

    • VAR (variable RCD selection)
    • 10 mA ~ 50 mA: 1 mA steps
    • 50 mA ~ 500 mA: 5 mA steps
    • 500 mA ~ 1000 mA: 10 mA steps

    Supply measurement

    • Voltage: 10 V ~ 600 V; (15 ~ 400 Hz) True RMS; ±3% ± 1 V ±2 digits
    • Phase rotation indication: L1–L2–L3 & L1–L3–L2
    • Frequency: 15 Hz ~ 99 Hz ±0.5% ±1 digit; 100 Hz ~ 400 Hz ±2.0% ±2 digits
    • Frequency resolution: 0.1 Hz
    • Power supply: 1.2 V NiMH (rechargeable pack of 6 – supplied)
    • Mains charger for on-board re-charging (4 hours typical) 12 V car charger (cigar lighter lead - optional)

    Earth / ground test

    • Resolution: 0.01 Ω
    • Current: 0.45 mA or 4.5 mA
    • Noise rejection: 20 V pk/pk (7 V rms)

    Max probe resistances

    • Rp & Rc: 100 kΩ @ 50 V; 5 kΩ @ 25 V
    • 2 & 3 pole method: (0.01 Ω ~ 1.999 kΩ); ±2.0% ±3 digits
    • ART method: (1.00 Ω ~ 1.999 kΩ); ±5.0% ±3 digits**
    • Stakeless method (1.00 Ω ~ 199 Ω): ±7.0% ±3 digits**

    Current (via optional clamp meter)

    • Accuracy: ±5.0% ±3 digits.
    • Range: 0.1 mA to 200 A ac
    • Resolution 0.1 mA

    MV sensor input

    • Including temperature (third party module): ±1.0% ±2 digits
    • Range: 0.0 mV to ±199.9 mV dc
    • Resolution: 0.1 mV

    Data storage

    • Capacity: 1000 results
    • Bluetooth communication

    Safety

    • EC 61010-1:2010
    • IEC 61010-30:2010
    • IEC 61010-031:2008
    • 600 V Cat III / 300 V Cat IV (Max Phase to Phase 600 V)
    • IEC 61557:2007 parts 1 to 10
    • EMC IEC61326 edition 2 location class B
    • Operating temperature range and humidity: -10 °C ~ +55 °C, 90% R.H. at +40 °C max
    • Storage temperature range and humidity: -25 °C ~ +70 °C
    • Maximum altitude: 2000 m
    • Weight (instrument and case): 1 kg (with batteries, excluding case)
    • Dimensions (instrument and case): 220 mm H x 390 mm W x 285 mm D
    • IP rating: IP54
    • Calibration temperature: +20 °C
    • Temperature co-efficient: <0,1% per °C
  • Supplied Accessories

    • Megger MFT1741 Multifunction Tester 1009-986
    • 3 wire test lead set with probes and crocodile clips
    • Mains plug test lead
    • Rechargeable batteries and charger
    • Switched test probe for remote testing
    • Megger embroidered Neck strap
    • Carry case
    • Full user guide CD for MFT1741
    • Megger calibration certificate
  • Product Documents

    Product Attachments

    View FileMegger MFT1741 Loop Impedance Test Application Note    Size: (394.35 KB)
    View FileMegger MFT1741 Confidence Meter Application Note    Size: (545.45 KB)
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