The Megger MFT1741 Multifunction Tester is a comprehensive, sophisticated low voltage installation tester. It is the latest in Megger’s series of MFT1700 Multifunction testers and features a unique (patent-pending) algorithm for earth loop impedance testing.
This unique algorithm facilitates the Megger MFT1741’s ability to perform quick, repeatable 3-wire non-trip loop tests on noisy and quiet circuits. The results obtained from these tests are unaffected by RCD and RCBO impedance and the test itself will not trip a vast majority of RCDs and RCBOs, with the exception of 30mA Type B. Should the user wish to test a circuit containing these rare Type B RCD and RCBOs, he/she need only select the Type B loop test option. This multifunction tester is particularly well suited to testing circuits which include 10mA RCDs and RCBOs, such as those present in schools.
Further to this, the patent-pending algorithm ensures that all the results attained via the Megger MFT1741’s 3-wire non-trip loop tests are accompanied by an arc indicating the reading’s reliability. For instance, should the user perform a loop test on a quiet circuit the Megger MFT1741 will respond swiftly with a provisional reading accompanied by a large visual arc, indicating the readings uncertainty; once this reading has stabilised (after approximately eight seconds) the large arc will shrink to a single element, indicating that the reading is now highly reliable.
With regards to noisy circuits the tester will gradually reduce the arc as the reading becomes increasingly stable; however, should the noise in the circuit increase the size of the arc will also expand, indicating the result's increased unreliability.
In addition to performing 3-wire non-trip loop tests, the Megger MFT1741 Multifunction Tester can also be used to carry out a number of other loop tests, such as:
- 2-wire non-trip loop tests (no neutral)
- High-speed, 2-wire, high current loop tests on unprotected circuits
Like the Megger MFT1731, this product can also be used to test insulation and earth electrodes, as well as take continuity, resistance, frequency and true-RMS voltage measurements. Similarly, this product also features single and three phase RCD testing and phase rotation.
The results taken using the Megger MFT1741 Multifunction Tester are displayed on its large, LCD display with dual parameter indication: this multifunction tester can simultaneously display loop resistance and fault current, or insulation resistance and test voltage parameters. These results can also be stored in the Megger MFT17741’s internal memory or can be downloaded using its built-in Bluetooth connectivity.
Like its sister models, the Megger MFT1441 features a colour coded test selection and a robust casing which protects the instrument against dust and water ingress (IP54). Furthermore, this product also has a safety rating of EN61010 CAT IV and includes audible and visual safety warnings triggered by hazardous voltages. The Megger MFT1741 will also prevent further testing if a dangerous voltage is present.
The Megger MFT1741 Multifunction Tester with Loop Confidence Meter combines Megger’s MFT1700 easy-to-use, accurate and safe features with a new unique algorithm for earth loop impedance tests; thereby ensuring that this product is the most sophisticated and versatile of the Megger MFT1700 series.
Megger MFT1741 Multifunction Tester with Loop Confidence Meter
- NEW: Comprehensive low voltage installation tester with a unique, patent-pending algorithm for earth loop impedance testing
- NEW: Performs quick, repeatable 3-wire non-trip loop tests on noisy and quiet circuits
- NEW: Results are not affected by RCD and RCBO impedance
- NEW: 3-wire non-trip loop impedance tests will not trip a vast majority of RCDs
- NEW: Type B loop test option for performing 3-wire non-trip loop tests on circuits containing 30mA Type B RCD or RCBOs
- NEW: Ideal for conducting 3-wire non-trip loop tests on circuits including 10mA RCDs and RCBOs
- NEW: Built-in confidence meter: arc will decrease as the reliability of the reading increases
- 2-wire non-trip loop tests (no neutral)
- High-speed 2-wire high current loop tests on unprotected circuits
- Continuity measurements
- Resistance measurements
- Frequency measurements
- True-RMS voltage measurements
- Insulation testing
- Earth electrode testing
- Single and three phase RCD testing
- Phase rotation
- Large, LCD display with dual parameter indication
- Internal memory
- Bluetooth communication
- Robust casing
- IP54, protected against water and dust ingress
- Safety rating of EN61010 CAT IV
- Audible and visual safety warnings for hazardous voltage levels
- Prevents testing when hazardous voltage levels have been reached
- Colour coded test selection
What’s Included?
- Megger MFT1741 Multifunction Tester with Loop Confidence Meter
- Printed Quick Start Guide
- Full User Guide on CD
- Calibration Certificate
- Switch Probe SP5
- Neck Strap - Megger Embroidered
- Three Wire Lead Set with Prods and Clips
- Mains Plug Test Lead (BS1363)
- AC Battery Charger
- Large Soft Pouch with Extra Storage
Accessories
There are a number of additional accessories available for the Megger MFT1741 Multifunction Tester; please see the table below for details. For further information please contact our sales team prior to purchase.
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Megger XTL30 Extended Test Lead (30 m)SKU2007-997 -
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Megger XTL50 Extended Test Lead (50 m)SKU2007-998 -
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Megger Earth Test Kit (for MFT Series)SKU1001-811 -
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CalCard Calibration CheckboxSKUCALCARD -
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Megger 1004-326 Soft Carrying CaseSKUMEGMTA4 -
Megger ETKIT3 Earth TesterSKUMEGETA17 -
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Megger 1001-977B Two-Wire Test Lead SetSKU1001-977 -
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Megger MTB7671 Calibration Test BoxSKUMTB7671
Megger MFT1741 Multifunction Tester Technical Specifications
| 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) |
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| 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 For test environments see service data |
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| 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 and 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 |
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| Phase rotation indication | L1–L2–L3 and L1–L3–L2 | |
| Frequency |
15 Hz ~ 99 Hz ±0.5% ±1 digit 100 Hz ~ 400 Hz ±2.0% ±2 digits |
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| Frequency resolution | 0.1 Hz | |
| Power supply | ||
| Batteries |
IEC LR6 type AA alkaline (6 cells - supplied) or 1.2 V NiMH (rechargeable pack of 6 – supplied) |
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| 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 and Rc 100 kΩ @ 50 V 5 kΩ @ 25 V |
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| 2 and 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* |
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| Stakeless method (1.00 Ω ~ 199 Ω) | ±7.0% ±3 digits* | |
| Current | ||
| Via Optional Clamp Meter | ±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 | ||
| Standards |
IEC 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 |
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| EMC |
IEC61326 edition 2 location class B |
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| 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 | 2000m | |
| 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 °CFor test environments see service data. | |
