- Designed for BS 7671 installation testing
- Three insulation test voltages up to 1000 V
- Two and three-wire non-trip loop testing
- Auto and programmable RCD test functions
Megger MFT1711 Multifunction Tester
Built for electricians testing low-voltage electrical installations to BS 7671, the Megger MFT1711 Multifunction Tester supports certification work on domestic, commercial and industrial fixed wiring. It combines TRMS voltage and frequency measurement with 250 V, 500 V and 1000 V insulation testing, 200 mA continuity, loop impedance and prospective fault-current measurement, plus RCD testing. A large backlit display uses a digital/analogue arc and dual digital readout to show measurements with their relevant test parameters.
Two and three-wire non-trip loop modes support work on RCD-protected circuits, while the 2Hi range provides high-current phase-to-earth and phase-to-neutral measurements. Auto RCD testing runs its test sequence at 0° and 180°, with additional support for Type AC, A, S and programmable RCDs, 10 mA testing and ramp tests. Colour-coded rotary controls, automatic test starting, dual TEST and LOCK buttons, live-circuit warnings, a rubber overmould, IP54 protection and a 600 V CAT III or 300 V CAT IV rating support straightforward operation across demanding installation environments.
Key Benefits
- Combines insulation, continuity, loop, RCD, voltage and frequency functions in one tester
- Two and three-wire non-trip loop modes support measurements on RCD-protected circuits
- Dual digital readouts show loop resistance and prospective fault current together
- Auto RCD testing performs its sequence at 0° and 180° without further instrument operation
- Automatic continuity testing leaves both hands available for holding the probes
- Live-circuit detection displays the voltage and inhibits insulation testing above the permitted level
- The backlit display presents measurements alongside relevant test parameters
- TEST and LOCK buttons at both ends support left-handed and right-handed operation
- Colour-coded rotary controls aid function and range selection
- Rubber overmoulding and IP54 protection support operation in tough environments
Common Applications
The Megger MFT1711 Multifunction Tester is suitable for a range of low-voltage installation testing tasks, including:
- BS 7671 electrical installation testing and certification
- Domestic fixed wiring installation testing
- Commercial fixed wiring installation testing
- Industrial fixed wiring installation testing
- Insulation resistance testing
- Continuity and resistance testing
- Earth loop impedance and prospective fault-current testing
- Type AC, A, S and programmable RCD testing
- TRMS supply voltage and frequency measurement
Why Choose This Model?
The MFT1711 suits electricians who require 250 V, 500 V and 1000 V insulation testing, 200 mA continuity, non-trip loop testing and Type AC, A, S and programmable RCD testing. Choose the MFT1721 when work additionally requires 100 V insulation testing, 15 mA continuity, phase-to-phase loop testing, R1 + R2, Type B or three-phase RCD testing, a 1000 mA RCD preset, phase rotation or clamp-current measurement.
Product Comparison
| Feature | Megger MFT1711 | Megger MFT1721 |
|---|---|---|
| Insulation test voltages | 250 V, 500 V and 1000 V | 100 V, 250 V, 500 V and 1000 V |
| Continuity test currents | 200 mA | 15 mA and 200 mA |
| Phase-to-phase loop testing | Not supported | 50 V to 500 V |
| R1 + R2 value | Not supported | Supported |
| RCD types | Type AC, A, S and programmable | Type AC, A, S, B and programmable |
| Three-phase RCD testing | Not supported | Supported without an earth connection |
| 1000 mA RCD preset | Not available | Available |
| Phase rotation | Not supported | L1-L2-L3 and L1-L3-L2 indication |
| Clamp-current measurement | Not supported | Supported with the optional MCC1010 clamp |
| SP5 switched probe included | Not included | Included |
General Specifications
| Specification | Details |
|---|---|
| Product type | Multifunction tester for low-voltage electrical installations |
| Model and order code | MFT1711-BS, 1008-121 |
| Supported installations | Domestic, commercial and industrial fixed wiring installations |
| Display | Backlit display with dual digital readout and digital/analogue arc |
| Controls | Colour-coded rotary switches with TEST and LOCK buttons at both ends |
| Automatic test start | Automatic continuity testing with selectable loop and RCD auto-start functions |
| Insulation test voltages | 250 V, 500 V and 1000 V |
| Continuity test current | 200 mA |
| Continuity buzzer thresholds | 0.5 Ω, 1 Ω, 2 Ω, 5 Ω, 10 Ω, 50 Ω and 100 Ω |
| Loop test modes | 3Lo three-wire non-trip, 2Lo two-wire non-trip and 2Hi two-wire high current |
| Loop result display | Loop resistance and prospective fault current displayed simultaneously |
| Loop functions | Z, ZMAX, PFC and PSCC |
| RCD types | Type AC, A, S and programmable RCDs |
| RCD test functions | 1/2 x I, 1 x I, 5 x I, ramp and Auto testing at 0° and 180° |
| RCD presets | 10 mA, 30 mA, 100 mA, 300 mA and 500 mA |
| Input protection | Protection against live circuits up to 600 V during insulation testing, including when the test is locked on |
| Fuse type | 2 x F2 1000 V 30 kA fuses |
| Ingress protection | IP54 |
| Installation category | 600 V CAT III / 300 V CAT IV, maximum phase-to-phase voltage 550 V |
| Safety standards | BS EN 61010-1:2010 and BS EN 61010-30:2010 |
| Measurement standard | IEC 61557:2007 parts 1 to 10 |
| EMC | IEC 61326 edition 2, Class B locations |
| Power supply | 6 x 1.5 V IEC LR6 type AA alkaline cells or 6 x 1.2 V NiMH HR6 rechargeable cells |
Measurement and Accuracy Specifications
| Measurement Function | Range and Resolution | Accuracy |
|---|---|---|
| TRMS voltage | 10 V to 600 V | Intrinsic accuracy: ±2% ±1 V Maximum service error: ±5% ±2 digits |
| Frequency | 15 Hz to 400 Hz Resolution: 0.1 Hz |
Intrinsic accuracy: ±0.5% ±2 digits Maximum service error: ±5% ±3 digits |
| 1000 V insulation resistance | 10 kΩ to 999 MΩ | ±3% ±2 digits |
| 500 V insulation resistance | 10 kΩ to 500 MΩ Greater than 500 MΩ |
10 kΩ to 500 MΩ: ±3% ±2 digits Greater than 500 MΩ: ±10% ±4 digits |
| 250 V insulation resistance | 10 kΩ to 250 MΩ Greater than 250 MΩ |
10 kΩ to 250 MΩ: ±3% ±2 digits Greater than 250 MΩ: ±10% ±4 digits |
| Insulation test output | Short-circuit current: 1.5 mA nominal Test current on load: ≥1 mA at minimum insulation pass values |
Output voltage: -0% +20% at rated load or less Voltage display: ±3% ±3 digits ±0.5% of rated voltage |
| Continuity and resistance | 0.01 Ω to 99.9 Ω 100 Ω to 99.9 kΩ Open-circuit voltage: 5 V ±1 V Test current: >200 mA at ≤2 Ω |
0.01 Ω to 99.9 Ω: ±2% ±2 digits 100 Ω to 99.9 kΩ: ±5% ±2 digits Maximum service error: ±12% ±2 digits |
| 2Hi loop test | L-PE and L-N Display range: 0.01 Ω to 1000 Ω Supply: 48 V to 280 V, 45 Hz to 65 Hz Test current: 4.0 A at 230 V PSCC range: 20 kA |
Intrinsic accuracy: ±5% ±3 digits Maximum service error: ±10% ±2 digits |
| 3Lo and 2Lo loop test | L-E 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 |
0.01 Ω to 39.9 Ω: ±5% ±5 digits 40.0 Ω to 999 Ω: ±10% ±5 digits Maximum service error: ±10% ±2 digits |
| RCD testing | Supply: 48 V to 280 V, 45 Hz to 65 Hz No-trip test: 1/2 x I Trip tests: 1 x I and 5 x I Auto and ramp testing |
No-trip current: -10% to 0% Trip current: +0% to +10% Ramp test current: ±5% ±1 digit Trip time: ±1% ±1 ms Maximum service error: ±10% ±2 digits |
| Programmable RCD | 10 mA to 50 mA: 1 mA steps 50 mA to 500 mA: 5 mA steps 500 mA to 1000 mA: 10 mA steps |
Maximum service error: ±10% ±2 digits |
| Touch voltage | 0 V to 253 V | +5% +15% ±0.5 V |
Mechanical and General Information
| Specification | Details |
|---|---|
| Operating temperature | -10 °C to +55 °C |
| Storage temperature | -25 °C to +70 °C |
| Humidity | 90% R.H. at +40 °C maximum |
| Maximum altitude | 2000 m to full safety specification |
| Dimensions | 150 mm high x 85 mm wide x 235 mm deep |
| Weight | 1000 g ±10%, including batteries but excluding test leads, accessories and carry case |
| Case protection | Rubber overmould for protection and grip |
| Operating positions | Handheld, floor standing, placed on a ladder shelf or platform, or suspended around the neck |
| Automatic power off | Selectable 2-minute or 20-minute inactivity period |
| Backlight duration | 20 seconds in manual mode, with selectable automatic mode |
Specification Notes
- Insulation testing is inhibited when circuit voltage exceeds 50 V, with a warning displayed above 25 V
- Loop and RCD tests require a supply between 48 V and 280 V at 45 Hz to 65 Hz
- Phase-to-phase loop testing and phase-rotation indication are not available on the MFT1711
Meta Description
Megger MFT1711 Multifunction Tester supports BS 7671 testing with 1 kV insulation, non-trip loop and Auto RCD functions.
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