Table of Contents
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Table of Contents
Summary of Contents for EFO MFT4
- Page 1 MFT4 Multifunction Installation Tester - 1 -...
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Page 2: Table Of Contents
User manual Index Safety information and explanation of symbols used ......3 Features of the MFT4 ................... 5 Special Polarity Test Function..............6 Audible tones ....................7 Overview of the switches and LCD ............8 Test lead inputs .................... 9 Continuity Test Function ................ -
Page 3: Safety Information And Explanation Of Symbols Used
Safety information and explanation of symbols used Because the MFT4 is a multi function tester used for testing both live and dead circuits there are different safety issues that apply to the individual functions. Before using your MFT4 please read these instructions paying particular attention to the general safety warnings below and those at the start of each section. - Page 4 Alkaline batteries type AA / LR6 in accordance with the polarity shown The MFT4 complies fully with the requirements of EN61010. The following table details the operating ranges for the individual functions compliant with the performance requirements of EN61557.
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Page 5: Features Of The Mft4
The MFT4 is packed with design features that maximise both convenience and safety. These include: Large display To give the clearest results the MFT4 uses a large auto-backlit LCD which makes reading the test results easy even when used in poorly lit areas. Auto shut down To preserve battery life when not in use the MFT4 incorporates an Auto-Off function that powers the unit down after three minutes of inactivity. -
Page 6: Special Polarity Test Function
Special polarity test function. It is a little known fact that a system can be reverse wired with Line (Phase) to earth/neutral and earth/neutral to Line (Phase). The sockets will all work and conventional loop testers will show and test that everything is correct despite this very dangerous wiring condition. -
Page 7: Audible Tones
Audible tones A simple selection of audible tones is used to supplement the visual display. These help the user by providing intuitive feedback during testing. In addition to warning about dangerous or unstable supply conditions they provide a very quick confirmation that the measurement process is taking place and, upon completion of the test, a warning if the results are likely to be regarded as a failure. -
Page 8: Overview Of The Switches And Lcd
Test lead inputs Muliplier PFC-PSC / Continuity RCD Recall Null Button Hands free Button Test Button Polarity test Function Selector touch pad area Overview of the switches and LCD The Primary display of the large LCD shows the result of the test being conducted. -
Page 9: Test Lead Inputs
Test lead inputs The test lead input/ output terminals are separated into two groups by the clear sliding interlock cover. When slid to the left (figure 1) the interlock cover exposes only the Black terminal (marked -) and the Red terminal (marked +). These are used for the Continuity and Insulation test functions. -
Page 10: Continuity Test Function
Traditionally this would mean that the resistance of the test leads would have to be measured and manually deducted from each subsequent reading. The MFT4 has a handy feature known as lead nulling that does this calculation for you. -
Page 11: Hands Free Continuity Testing
The word ‘NULL’ will now appear in the display and all subsequent continuity tests conducted by pressing the Orange test button will automatically deduct this value before displaying the result. To confirm that this is working press the Orange test button with the prod tips still connected together and the display should show zero resistance. -
Page 12: Insulation Test Function
Connect the Red test probe to the phase conductor and the Black probe to the other conductor being tested and press the Orange test button. During Insulation testing the MFT4 will audibly indicate that measurement is being made by emitting a steady beeping sound. -
Page 13: Hands Free Insulation Testing
Hands Free Insulation testing To enable the hands free feature simply press the HANDS FREE button once, The ‘HANDSFREE’ annunciator will appear flashing on the LCD and will continue to do so until cancelled by a further press of the HANDS FREE button or by changing the function selector switch. -
Page 14: Loop Test Functions
Although fully protected against over voltage to 440V this tester should only be used on a 240V 50Hz supply Important note for calibration check box users: The smart loop test system used by the MFT4 is immune to sudden high value changes such as voltage spikes. As a result when changing... -
Page 15: Pfc/Psc
This will reduce the chances of the RCD tripping as a result of combined leakages. PFC/PSC In both Loop test modes the MFT4 will also display the supply voltage and at the touch of the PFC button the PFC/PSC will be displayed. Test lead configuration The MFT4 Loop test function can be used with 2 different types of connecting lead. -
Page 16: Lead Configuration For No-Trip Testing
Lead configuration for No-Trip testing In No-trip mode the tester can be used with the mains lead TL-3P when testing at 10A socket outlets, or the distribution board lead set TL-RGB for testing at other points in the circuit. In No-trip mode the 3 colour coded prods/crocodile clips of the test lead should be connected to the corresponding Line, Neutral and Earth terminals. -
Page 17: Loop Test Procedures
Mains supply wiring and voltage test When first connected to a mains supply the MFT4 will automatically conduct a safety test to ensure that the Live, Neutral and Earth conductors are all connected correctly and that the supply voltage is in the acceptable range ( 207-264V ). -
Page 18: High Current Test (Ze)
High current test (Ze) The high current should only be conducted with the distribution board test lead set TL-RGB configured in 2 wire mode. Do not use this function with the TL-3P mains lead or the distribution lead set in 3-wire configuration. Rotate the function selector to the HIGH position. -
Page 19: Rcd Test Function
Caution Although fully protected against over voltage to 440V this tester should only be used on a 240V supply The MFT4 will test RCD standard (AC) types across the full range of tests required. Test requirements Each RCD should be tested to ensure that: It operates with a maximum disconnection time indicated in the table when a fault at its rated current is introduced. -
Page 20: Ramp Test
In addition to displaying the time taken for the RCD to trip the MFT4 will also indicate whether it has passed or failed the RCD test requirements. Ramp test The MFT4 also includes a diagnostic Ramp test feature. In this mode rather... -
Page 21: Rcd Test Procedure
Connect the 4mm plugs of the chosen test lead to the corresponding L, N & E terminals of the MFT4 and connect the other end to the socket or circuit terminals under test. If using the distribution board test lead set TL-RGB observe the correct polarity by connecting the Red probe to the Live conductor, Black to Neutral and Green to Earth. -
Page 22: 30Ma Automatic Test
The main display shows that the fault current was applied for over 2000 milliseconds (2 seconds) without tripping the RCD. The secondary display confirms that this passes the requirements. In the event of the RCD failing the test and tripping within 2 seconds at half the rated current the main display will show the trip time and the secondary display will show ‘FAIL’. -
Page 23: Specifications And Tolerances
Specifications and tolerances Continuity test range accuracy Ranges (Auto Range) Tolerance (@ 20°C) 0.00 to 9.99 Ω ±3% ±2 digits 10.0 to 99.9 Ω ±3% ±2 digits 100 Ω to 19.99 KΩ ±3% ±2 digits Open Circuit Voltage >4V, <10V Short Circuit Current >200 mA 4 Ω... -
Page 24: Rcd Test Range Accuracy
RCD Test range accuracy Supply voltage 207V – 264V AC 50Hz –0% to –10% Test current accuracy (½ I) +0% to +10% 30mA ( I ) ± 5% Test current accuracy (I, 5I) Trip time accuracy up to 1 second ±(1% + 1ms) Trip time accuracy over 1 second ±(1% +10ms)
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