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Upgrade from the MFT1730 to the brand new 1731 and experience the following new features:
The highest specification model in Megger's MFT1700 range of multifunction testers, the MFT1730 provides electrical professionals with all of the testing procedures they need to ensure that installations are completed safely, accurately and within all regulations.
Made for use on low voltage electrical installations to BS7671, the MFT1700 range is trusted by thousands of professionals as their installation testers of choice due to its wide variety of testing abilities, durable, rugged design and various advanced features that are designed to enhance testing procedures on a daily basis.
This video animation has more information on why you should be considering adding the MFT1730 to your library of test equipment:
As standard the Megger 1730 comes with all of the functionality of the other models in the series - the MFT1710 and MFT1720 - and adds many new features that are exclusive to this model.
No matter what type of low voltage installation you're working with this tester has you covered thanks to its huge range of different testing procedures.
The comparison chart below outlines the functionality of this multifunction tester and compares it with the other models in the series.
|Test Voltage Display||√||√||√|
|Adjustable Buzzer Threshold||√||√|
|Continuity & Resistance Ranges|
|Adjustable Buzzer Threshold||√||√||√|
|1/2, 1, 5 x I & Ramp RCD Test||√||√||√|
|Auto RCD Test||√||√|
|Type AC, A and S RCDs||√||√||√|
|Type B (Pure DC) RCDs||√|
|3-Phase RCD (No Earth)||√||√|
|30, 100, 300 and 500mA RCD||√||√||√|
|10mA and 1000mA RCD||√||√|
|2 and 3-Wire Non-Tripping
L-PE 50V - 280V
|2 Wire Hi Current L-N 50V - 280V||√||√||√|
|2 Wire Phase to Phase L-L
50V - 500V
|PSCC & PFC (20kA Max)||√||√||√|
|Max Zs Display||√||√|
|R1 + R2 Value||√||√|
|Touch Voltage Display on
|Earth Electrode Test|
|2 and 3 Pole||√|
|Leakage Current Measurement||√||√|
|Rechargeable Batteries with
|SP5 Switched Probe Included||√||√|
|Warranty Upgradeable to 3 Years||√||√||√|
|On-Board Memory with Bluetooth
|CAT IV 300V / CAT III 600V||√||√||√|
Made with Megger's trademark robust design, the Megger MFT1730 is designed to be resistant to damage and constantly ensures that the user is protected at harm at all times.
This multifunction tester includes both visible and audible safety warnings designed to give full input protection and give the user a warning when hazardous voltage presence is detected. When testing continuity of insulation a voltage reading will be shown on screen and if it exceeds a safe level the MFT1730 will automatically inhibit the test procedure and start to emit a warning beep.
The casing of the tester is also extremely durable with IP54 rating (ingress protection against dust and moisture damage) and is robust enough to be thrown onto the floor, accidentally knocked or can even be run over by a van and keep working as if nothing has happened!
The MFT1730 is the only tester in the Megger 1700 range to come with rechargeable batteries, allowing users to work without direct access to a mains socket.
It is also the only multifunction tester in this range to come with built-in memory, allowing testing results to be saved directly on the tester and downloaded at a later date via wireless Bluetooth technology.
This testing information can then be interacted with further by using Megger's PowerSuite software packages which allow easy asset management, creation of customised reports and much more.
Having picked up the Megger 1730 for the week (strictly on loan, or course!), I headed for the nearest electrical installation — determined to get to grips with my new toy. The case is a standard ‘Megger’ case and as such, unless everything is kept in the plastic bags provided, all the leads, clips and probes rattle around endlessly during transit.
Why couldn't they provide proper compartments or pouches with these testers to control all these bits?
So what's inside?
Included in the price of just under £900 are the MFT 1730 unit itself, plus a range of leads:
Also included is the battery charger for the rechargeable batteries, with various adapters for other countries — just in case I want to test the hotel electrics next time I go to Torremolinos. I attached the carrying strap, which has plenty of adjustment. I personally like to have the unit quite high, and find a strap useful when I am wondering around taking Zs tests, as it leaves my hands free for holding probes, writing or scratching various parts of my anatomy.
I know some electricians don't like using the strap, preferring to sit the unit down, but I swing both ways, depending on what and where I am testing.
As with most electricians, I could not wait to get started — after all, who needs instructions? I turned the unit on to the first symbol I recognised and was delighted by the extremely readable display. This has been a cause of concern to me on some other testers — I personally use a Kewtech KT65 which I get along with very well, but the major drawback is the display (especially as I am now in my fifties).
The Megger display is very easy to read — even without the backlight on — so full marks for that. Having got over my little moment of excitement, I then started to take in the bewildering array of knobs and buttons. These feature a range of different colours, with occasional hieroglyphics. That is when I reached for the Quick Start Guide.
Being an average male, I don't read instructions normally, anything technical is handed to teenage children who instinctively know how things operate, and then I recreate an 'idiot guide' a basic operation from selected offspring. It works for me!
However this was different, as under the EAW 1989, I couldn't really expect a 13-year-old to demonstrate inspection and testing to me, so the Quick Start Guide was opened and followed step-by-step.
The overview diagram explained that there was a primary function selector switch, and a secondary function switch, and that the buttons on the left and right hand ends of the unit were pretty much duplicates of each other for ambidextrous operation. There were a couple of minor function buttons, and the terminal panel at the back for inserting leads. Again, my advancing years caught up with me, as I did find the guide slightly small and a little hard to read.
Any chance of something a little bigger please Megger?
The 1730 Functions
The first function on the 1730 was for testing voltage, frequency and/or phase rotation. The individual leads were connected as per the Guide, and I was ready to test. The tester self-activates so there was no need to press any buttons, and the voltage and frequency were clearly displayed. Adjusting the leads for testing phase rotation, I touched the probes onto the three phases, but before I had time to press the arrowed function button, as directed by the Quick Start Guide, the phase rotation appeared on the display, showing L1, L2, L3 within the voltage of 426 V.
Playing devil's advocate, I then swapped my probes over to see what happened when the phase rotation was wrong. I connected the L1 (red) probe to L3, blue to L1 and green to L2, simulating a phase rotation of L3, L2, L1. Instead of the expected “wrong” result of L1 : L3 : L2, I recorded a “correct” reading of L1 : L2 : L3!
Phase rotation - Incorrectly connected, but displaying correct rotation.
Phase rotation - Incorrectly connected, and displaying incorrect rotation.
This was a bit worrying, so I dug out my Kewtech KT65 to see what that would show. Repeating the same exercise, the Kewtech displayed 1 − 2 − 3 in the first instance and then 3 − 2 − 1 when the connections were changed, i.e. the Kewtech showed the correct phase rotation sequence. One up to the Kewtech I think, even though it was a struggle to read the display!
This could be a major problem, as it is important to maintain the phase sequence throughout an installation, otherwise we could experience 400 V between live parts that we considered to be on the same phase!!
Megger have posted an official response to this issue. Official response follows:
We can confirm the MFT1730 does indeed conduct a correct phase rotation indicated by either L1, L2, L3 or L1, L3, L2 on the display depending on which way the leads are connected to the 3 phases on the circuit.
Not too sure what is happening on the review instrument.
Comment regarding the mentioned metal clip for nulling of the mains testlead for R1 + R2 tests as both the mains lead and the individual testleads have identical compensation for testing within the stated calibration. This means the leads can be swapped without re-nulling leads so a ‘bridging device’ is not really required.
The lock function on the insulation ranges may appear pointless and possibly unsafe as this means a high voltage will be present permanently on the testleads.
We have industrial customers that are not just BS7671 electricians who have to conduct tests on very long cables called Polarisation Index and Dielectric Absorption Ratio. These tests require timed spans of insulation test voltage so a ratio can be calculated. One of the tests would require the test button to held down for 10 minutes and put quite simply, who would wish to do that, much easier just to stop the test at the required time.
The Zef and R1+R2 sections in the green loop impedance section on the second dial enable an electrician to conduct a simple R1+R2 test using a live test. A Ze reading is conducted with the the Zref selected and then a Zs test is made with the R1+R2 selected. The instrument will then subtract one value from the other to give an ‘R1+R2’ value…
This form of testing should only be used as an indication of R1+R2 as parallel earth paths will not been ‘seen’ by this method so the ohmic value of these paths will included in the calculation giving excessively low R1+R2 readings.
This function does not replace the traditional method of obtaining R1+R2 readings and should never be used for new installation reports.
The green section on the first dial is for both earth and neutral loop functions which include PFC and PSSC measurements.
The maximum test current possible on an RCD test on the MFT1700 Series is 1000mA so it would be not possible to conduct a 5 x 300mA test on RCDs (test is aborted on the MFT1700 Series)
The 1A RCD range is included for industrial electricians who work on large machine electrical cabinets which may contain 1A RCDs.
Moving on to continuity, I started by adding an additional lead and trying to null the instrument, always an important function that needs to be done correctly. It is a simple operation, I touch the leads together, push the null (test) button, the null symbol will appear on the display and the display will read 0.00 Ω. After that, you do not press the test button again, as all continuity test are automatic on contact.
Pressing the test button will reset the instrument, and you will have to null it again!! I used the red and the green lead in L1 + L2 terminals (+ and −) respectively, as I like the matching colours. Again, the Quick Start Guide was consulted, which pushed me in the right direction.
Continuity testing is easy, just make the connections and read off the values on the lovely large display. Changing to crocodile clips will necessitate nulling again, otherwise incorrect readings will be recorded. A buzzer function is available if required. The 13 A plug mains lead can be used, but needs to be nulled.
This operation is well catered for with the Fluke zero adapter which comes with the Fluke MTF models, but unfortunately Megger (and Kewtech) have not yet woken up to this.
Careful selection of the terminal connections is necessary to ensure that the correct conductors are connected in circuit for continuity testing at socket outlets when using the mains adapter. Insulation resistance testing can be done using a range of voltages: 100 V, 250 V, 500 V and 1000 V. Just select the level of voltage, press the test button and take a reading. Again, a buzzer is available, which you can set at different thresholds from 0.5 MΩ to 500 MΩ.
I am not sure quite why you would want this, as I am also uncertain about the test lock function. Why would I leave the tester pumping out 500 V or even 1000 V, and then wander off? Surely that is not safe practice? I would suggest that maybe having lower lockable threshold to aid fault finding would be more acceptable and useful. The loop testing section has a number of different functions and options. Using the main selection of L – PE and the secondary of Z, standard Ze and Zs readings can be taken, using either 2 leads on high or low current, or 3 leads on low current — a facility that should avoid tripping RCDs when testing.
The Megger 1730 also has a Z max function for displaying its highest recorded Zs reading as well as the last Zs reading taken, and this is very useful testing final circuits. The other functions available are Zref, a function for recording and remembering the Ze of an installation, and R1+R2, a function for calculating R1+R2 from a measured Zs value after automatically deducting Ze (Zref). These last two functions are, in my opinion, in the realm of nonsense and encourage bad practice. R1+R2 should be properly measured by a low resistance ohmeter during continuity of protective conductors or my final circuit NOT calculated from nice easy Zs readings because we cannot be bothered to do the job properly!!
While dwelling in the realm of the strange and slightly weird, the tester also has another section on the main selector switch labelled L–L / L–N, masquerading in the earth loop impedance green section.
This section is best used for measuring prospective short-circuit current between Line and Neutral (L–N) for single phase and between Lines (L–L) for three phase installations. Prospective earth fault current is displayed as a by-product of the Ze reading when testing in the L–PE section. The frustrating thing is that although the tester operates well and performs the tasks asked of it, the Quick Start Guide is not well written — in fact it does not even mention prospective fault current, so these test functions must be worked out by the operator using trial and error.
The RCD section in the main selector switch ranges from ½ IΔn, IΔn, 5 × IΔn, and also includes an AUTO option and the RAMP test. The secondary selector switch gives the option of selecting a 10 mA, 30 mA, 100 mA, 300 mA, 500 mA, 1 A, or variable rating. The AUTO and RAMP options are useful tools. I find the AUTO function saves a lot of walking when testing large installations. As always, I tried to do something that should not be possible — testing a 100 mA RCD at ×5 — and the tester allowed me to do it! However, it did stop me from trying to test a 300 mA at ×5, so that's something. I'm still puzzled by the 1 A setting.
The earth electrode test facility (Re) is a useful function for testing TT system earth electrodes when there is no power. However, nowadays — more often than not — I would choose to do a Ze test on the earth electrode instead if backed by an RCD unit, as per BS 7671:2008. Nevertheless, it is nice to see this function still included on an MFT. I could not try it out as it requires the purchase of additional leads, plus the test electrodes as well, as they do not come in the standard box.
The final function is the earth leakage test, and again an additional investment of several hundred pounds is required to secure the necessary equipment to make use of this function. Testing for earth leakage, especially in office and school environments, can be quite beneficial to avoid the possibility of nuisance tripping, but again it might not be as useful to the majority of electricians.
While using the leads that come with the 1730, I found they clip together quite nicely, and feel robust and are comfortable to work with, until you try to take them apart! Removing the probe tips can be a little tricky, and occasionally painful, as there is a tendancy to stab yourself whilst attempting to remove the tips!
The tester has download and bluetooth connectivity, and appropriate software availabe at a price (another £100 or so!) and again there are those of us who probably might never use that function.
Overall, as a top of the range 1730, the Megger has many good aspects. I like the leads, they feel right, not flimsy, and the display is excellent. It has many functions, but not all of them are, in my opinion, useful and in keeping with good practice. Priced at £900, give or take a bag of sweets, I find myself wishing that they would produce a similar model, take out the weird and wonderful functions that I would never use, knock £250 off the price and I would buy it straight away!
As a postscript, I have also looked at the Megger 1710. This has all the basic functions that I would want in a tester. If they could add AUTO RCD testing and phase rotation, that would be my ideal tester. Surely they could do that for another £100?
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|Output Voltage||-0% to +20% at rated load or less|
|Voltage Display||±3% ±3 digits ±0.5% of rated voltage|
|Short Circuit Current||1.5mA nominal test current|
|Test Current on Load||1ma at min pass values of insulation|
|1000 Volts||10kΩ - 999MΩ ±3% ±2 digits|
|500 Volts||10kΩ - 500MΩ ±3% ±2 digits
>500MΩ ±10% ±4 digits
|250 Volts||10kΩ - 100MΩ ±3% ±2 digits
>250MΩ ±10% ± 4 digits
|100 Volts||10kΩ - 100MΩ ±3% ± 2 digits
>100MΩ ±10% ±4 digits
|0.01Ω - 99.9Ω||±2% ±2 digits|
|100Ω - 99.9kΩ||±5% ±2 digits|
|Open Circuit Voltage||5V ±1V|
|Test Current (0Ω - 2Ω)||
205mA ±5 mA 15mA ±5mA
|Live to Earth/Neutral Supply||48V - 280V (45Hz - 65Hz)|
|Live to Live Supply||48V - 500V (45Hz - 65Hz)|
|L-N/L-L Tests||±5% ± 5 digits|
0.1Ω - 39.9Ω
40Ω - 1000Ω
±5% ±5 digits ± noise margin
±10% ±5 digits
|Display Range||0.01Ω to 1000Ω|
|Live to Earth PFC Range||20kA|
|Live to Live PSCC Range||20kA|
|Supply Up to 100mA||48V to 480V (45Hz to 65Hz)|
|Supply Up to 1A||48V - 280V|
|RCD Type||Type AC, A, S
Type B (Pure DC)
|No Trip Test (1/2xI)||-10% to -0%|
|Touch Voltage (0-253V)||±5% + 15% ±0.5V|
|Trip Time||±1% ±1ms|
|VAR (Variable RCD Selection)||10mA - 50mA - 1mA steps
50mA - 500mA - 5mA steps
500mA - 1000mA - 10mA steps
|Voltage||10V - 600V (15 - 400Hz) True RMS
±3% ± 1V ± 2 digits
|Phase Rotation Indication||L1-L2-L3 & L1-L3-L2|
|Frequency||15Hz - 99Hz ±0.5% ±1 digits
100Hz - 400Hz ±2.0% ±2 digits
1.2V NiMH (Rechargeable Pack of
|Current||0.5mA or 4.5mA|
|Noise Rejection||20V pk/pk (7V rms)|
|Max Probe Resistances Rp & Rc||100kΩ @ 50v
5kV @ 25V
|2 and 3 Pole Method (0.01Ω - 1.999kΩ)||±2.0% ±3 digits|
|Current (Via Optional Clamp Meter)||±5.0% ±3 digits|
|Range||0.0mV to ±199.9mV DC|
|Design Safety Standards||IEC 61010-1: 2010
IEC 61010-30: 2010
IEC 61010-031: 2008
600V CAT III / 300V CAT IV (Max Phase to Phase 600V)
IEC 61557: 2007 Parts 1 to 10
|EMC||IEC61326 Edition 2 Location Class B|
|Temperature (Operational)||-10 to 55°C|
|Temperature (Storage)||-25 to 70°C|
|Operating Humidity||90% RH at +40°C max|
|Weight||1kg (with batteries, excluding case)|
|Dimensions||150mm H x 85mm W x 235mm D|
|Moisture/Dust Ingress Protection||IP54|
|Temperature Coefficient||<-0.1% per °C|
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