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The Megger MFT1741 multifunction tester has been designed for testing low voltage electrical installations, particularly in locations that suffer from high electrical noise. It provides all the tests required to complete the necessary electrical certification for industrial, commercial and domestic fixed wiring installations.
Overlaying the new non-trip loop impedance measurement is the new “confidence meter”. As loop impedance values can be dramatically affected by circuit noise, the Confidence Meter displays the degree of confidence in the accuracy of the measured loop impedance. Using the digital ARC to indicate the analytical process, the measurement is continually monitored and adjusted when circuit noise is present, resulting in a dramatically improved and repeatable test result.
The MFT1741 offers a wide range of test functions, designed for all electrical installation testing and verification of low voltage building wiring and distribution testing scenarios. The MFT1741 is IEC 61010 CAT IV 300 V rated for safe connection anywhere within the LV network on single and three-phase systems.
The new Confidence Meter has been enabled on the three-wire loop impedance measurement mode (3Lo) of the Megger MFT1741. This replaces the existing 3-wire loop technology, offering the following benefits:
- New Confidence Meter adaptive measurement
- Graphical representation of measurement ‘quality’ using the analogue arc
- Stable, repeatable loop test result on noisy circuits
- Reduced need for multiple testing from variable results
- The ability to test through 10 mA RCDs and RCBOs
- Option for testing 30 mA Type B RCDs without the risk of tripping
In use:
The 3Lo measurement should be chosen only where testing through an RCD or RCBO is required. Connection of the MFT1741 or MFT1845 is made to the phase, neutral and earth conductors using either the standard mains plug test lead or a three-wire test lead.
Pressing the TEST button will perform a safety check to ensure no hazardous earth conditions exist. The test sequence will then measure the earth loop impedance of the circuit and display an initial value within a four second window.
Voltage display: ±3% ±3 digits ±0.5% of rated voltage
Max service error: ±15% ±2 digits.
Short circuit current: 1.5 mA nominal test current
Test current on load: ≥1 mA at min. pass values of insulation
Output voltage tolerance: -0% +20% at rated load or less
Continuity / Resistance:
Intrinsic accuracy: ±2% ±2 digits (0.01 Ω to 99.9 Ω), ±5% ±2 digits (100 Ω to 99.9 kΩ)
EN61557 range: 0.1 Ω to 99.9 kΩ
Open circuit voltage 5 V ±1 V
Test current at 200 mA (0 Ω to 2 Ω): >200 mA @ ≤2 Ω
Test current at 15 mA (0 Ω to 2 Ω): >15mA @ ≤2 Ω
Max Service error: ±12% ±2 digits.
Loop test 2Hi (L-PE, L-N, L-L):
Intrinsic accuracy: ±5% ±3 digits
Display range: 0.01 Ω to 1000 Ω
Supply: 48 V to 480 V* (45 Hz to 65 Hz)
Test current high: 4.0 A (at 230 V)
PSCC range: 20 kA
EN61557 range: 0.30 Ω to 1000 Ω
Max service error: ±10% ±2 digits
Loop test 3Lo, 2Lo (L-E):
Intrinsic accuracy: 0.01 Ω to 39.9 Ω ±5% ±5 digits
40.0 Ω to 999 Ω ±10% ±5 digits
Display range: 0.01 Ω to 1000 Ω
Supply: 48 V to 280 V (45 Hz to 65 Hz)
Test current: Pulsed
PFC range: 20 kA
EN61557 range: 1.0 Ω to 1000 Ω
Max service error: ±10% ±2 digits
RCD test:
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
Voltage:
Intrinsic accuracy: ±2% ±1 V
EN61557-1 Range: 10 V to 600 V
Phase rotation indication.
Max service error: ±5% ±2 digits
Frequency:
Intrinsic accuracy: ±0.5% ±2 digits
Resolution: 0.1 Hz
EN61557 Range: 15 Hz to 400 Hz
Max service error: ±5% ±3 digits
Earth Test Ranges:
Intrinsic accuracy: ±2.0% ±3 digits
ART method ±5.0% ±3 digits
Stakeless method ±7.0% ±3 digits
Resolution: 0.01 Ω
EN61557 range: 1.0 Ω to 1.99 kΩ
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
Max service error: ±20% ±3 digits
Current (via Clamp meter):
Intrinsic accuracy: ±5.0% ±3 digits
Resolution: 0.1 mA
EN61557 Range: 0.5 mA – 199 A
Max service error: ±10% ±2 digits
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
Internal memory
Capacity 1000 results
Bluetooth® communication
Power consumption:
Nominal minimum: 60 mA (Voltage range with no input voltage)
Nominal maximum: 350 mA (Active Insulation test set to 1000 V / 1 MΩ)
Range: -20 °C to +55 °C
Temperature (via 3rd Party Module):
Intrinsic accuracy: ±1.0% ±2 digits
Resolution: 1 °C
Range: -20 °C to +100 °C
Environmental Specification
Temperature
Operational range: -10 °C to +55 °C
Storage 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 case.
Dimensions: 150 mm high x 85 mm wide x 235 mm deep (6 in. x 3.5 in. x 9.5 in.)
IP rating: IP54
Power Supply
Battery: Primary 6 x 1,5 V cells IEC LR6 type (AA alkaline,).
Battery: Rechargeable: 6 x 1.2 VNiMH cells EC HR6.
Display shows rechargeable [NiMH] when the battery type is changed in setup option (Section 10).
Safety / EMC
EMC In accordance with IEC61326 edition 2.
Locations: Class B locations.
Safety in accordance with BS EN 61010 -1 2010 + 61010 -30:2010
Installation Category: 600 V CAT III / 300 V CAT IV. (Max Phase to Phase 550 V)
In addition switch probe and test leads are designed to meet IEC 1010-031:2008, Double insulated to Installation Category III, 300 V phase to earth, 500 V phase to phase.
Why choose Instrotech for your electrical test equipment?
With over 40 years’ experience supporting UK electricians, technicians and engineers, Instrotech is your trusted partner for quality tools and expert service. When you purchase from us, you benefit from:
Free UK shipping on all orders
Access to our knowledgeable technical support team
Available calibration services to maintain safety compliance
A 90-day money-back guarantee for complete peace of mind
We’re committed to helping you work safely and efficiently with industry-leading products and ongoing support.
