MFT1500 Series Multifunction Tester
Contents
1. PHASE TO EARTH PSC Test Lead set OPTION 1 2 1 For Single phase measurement connect the test leads as shown above For Phase to Phase measurement connect the GREEN lead to the 2nd Phase 2 Supply voltage and polarity are displayed 3 The test will beep and automatically start when voltage is detected 4 Measured PSC value is displayed If desired the test can be repeated by pressing the YELLOW TEST button 12 PHASE TO NEUTRAL PSC As for the 25 A Phase to Earth PSC test but with the following test lead connections 1 Connect the GREEN lead to the NEUTRAL and the RED lead to PHASE 2 The test will beep and automatically start when voltage is detected 3 Measured PSC value is displayed Notes The PSCC of a circuit is the largest Prospective Fault Current PFC In a single phase system this would be the larger of the earth loop PFC and the neutral loop PFC In a multi phase system phase phase loops also need to be considered and these can be measured using the Loop 25A switch position The PSC is calculated by using the sum Nominal supply voltage PSC Loop resistance The supply voltage used in the calculation depends on the measured voltage The instrument uses the following voltage values Actual measured voltage Nominal voltage gt 45 V and lt 80 V 55 V gt 80 V and lt 150 V 110 V gt 150 V and lt 300 V 230 V gt 300 V 400 V PSC measurement accuracy the Phase Earth loop2. OPTION 3 2 wire lead Switched Mains plug test lead L E Set the Rotary range knob to the V range The position of the right hand mA rotary range knob does not matter Two wire lead set or Switched Probe connection Using the 2 wire lead set OPTION 1 or OPTION 2 1 Connect the test leads as shown 2 DC Voltage V or AC Voltage V is automatically displayed OR Using the Mains plug Lead set OPTIONS Voltage between the L and E pins is displayed Note When connected to the circuit under test the instrument will automatically display AC or DC voltage measurement up to 500 V This function will continue to work if the fuse is blown CONTINUITY Waming Prior to any continuity testing ensure the circuits under test are isolated and not live TEST LEAD CONNECTION OPTION 1 OPTION 2 2 wire lead Switched set probe Set the left hand rotary range knob to the Q range required The position of the right hand rotary range knob does not matter Continuity measurement can be made using one of the 2 options shown above A continuity measurement is made automatically when the test leads are connected to the circuit under test The contact symbol on the display closes when a resistance of approximately 200 kQ or less is detected Lead Null up to 9 99 Gy Short test probes or clips together and press the YELLOW TEST button on the instrument or on the switched probe if fitted The fo will be displa
3. Output voltage 20 0 at rated load or less Auto discharge facility safely discharges connected circuit after test Live circuit warming inhibit when connected to live circuits Threshold 55 V EN 61557 Operating Range 0 10 MQ to 99 9 MQ 16 Loop ranges to EN 61557 3 Line Earth Single phase Supply 55 V 270 V 45Hz to 65Hz 25 A 0 01 Q 9 99 Q 45 0 03 Q 10 0 Q 89 9 Q 45 0 59 90 Q 899 Q 45 45Q 900 Q 3 00 KQ 45 209 EN 61557 Operating Range 0 25 Q to 3 00 KQ Line Line Three phase Supply 55 V 480 V 45Hz to 65Hz 25 A 0 01 Q 19 99 Q 45 0 03 Q at 230 V EN 61557 Operating Range 0 25 Q to 19 99 Q Low cunent Loop No Trip Supply 55 V 270 V 45Hz to 65Hz 15mA 0 01 Q 2 00 KQ 45 0 03 Q Noise Margin at 230 V EN 61557 Operating Range 0 5 Q to 2 00 KQ Prospective Short circuit Current PSC Prospective Short circuit current Nominal Voltage Loop Resistance Accuracy is therefore derived from the loop test 1A 199A 0 02 kA 1 99 kA 1 A resolution 10 A resolution 2 0 kA 19 9 kA 100 A resolution Continuity to EN 61557 4 Ohms 0 01 Q 99 9 Q 2 2 digits 100 Q 99 9 KQ 45 2 digits EN 61557 Operating Range 0 10 Q to 99 9 KQ Buzzer Operates continuously at less than selected limit Selectable limits of 2 Q 5 Q 10 Q 20 Q 50 Q 100 Q Open circuit voltage 4 5 V d c Test current gt 200 mA at 2 Q Test Lead resistance zeroing Up to 9 99 Q zero uses Test Button RCD ra
4. SOCKET Test Lead set OPTION 3 1 Select NO TRIP Loop test range Insert the plug into an installation socket Supply voltage and polarity are displayed PP o The test will beep and automatically start when voltage is detected 5 Measured loop value is displayed If desired the test can be repeated by pressing the YELLOW TEST button NO TRIP EARTH LOOP IMPEDANCE MEASUREMENT NOT ATA POWER SOCKET Test Lead set OPTION 1 or OPTION 2 1 Firmly connect the GREEN lead to EARTH the BLACK lead to NEUTRAL and the RED lead to PHASE 2 Perform the loop test as above for power socket If desired the test can be repeated by pressing the YELLOW TEST button HIGH CURRENT LOOP TESTING 25 A Single Phase and Phase to Phase loop testing on circuits that are NOT protected by RCD 10 OPTION 1 OPTION 2 OPTION 3 2 wire lead Sw itched Mains plug set probe test lead Set the instrument to the 25 A Loop test range 25 A Phase to Earth loop impedance measurement at a power socket Test Lead set OPTION 3 1 Insert the plug into an installation socket 2 Supply voltage and polarity are displayed 3 The test will beep and automatically start when voltage is detected 4 Measured loop value is displayed If desired the test can be repeated by pressing the YELLOW TEST button 25 A Phase Earth loop impedance not at a power socket Test Lead set OPTION 1 or 2 1 Connect the GREEN lead to EARTH and
5. is being measured this leakage may be due to An accurate PSC measurement requires an accurate measurement of the loop resistance The difference of a few digits in the loop resistance measured will have a large effect on the PSC displayed Noise Indication The symbol is displayed when excessive noise caused by other equipment exists on the circuit under test This noise can effect the accuracy of the loop measurement The operator is advised to repeat the measurement or if the noise symbol continually appears investigate the cause Method of measurement The phase earth phase neutral or phase phase loop resistance can be measured The instrument takes a current from the supply and measures the difference between the unloaded and loaded supply voltages From this difference it is possible to calculate the loop resistance The test duration will depend on the loop resistance value and the presence of noise on the supply The NO TRIP loop test range performs a test with a current of up to 25 A flowing Line to Neutral to measure the resistance of the source and line wires followed by a current of 15 mA flowing Line to Earth to measure the resistance of the earth wire Possible sources of error The reading depends on a measurement of the supply voltage and therefore noise or transients caused by other equipment during the test could cause an error in the reading One way to check for these is to do two tests and look for any difference i
6. I test range 1 Press the YELLOW TEST button 2 The trip time will be displayed 3 Ifthe RCD fails to trip gt 40 ms is displayed indicating a failed test Note The instrument can only test up to 1 A a c or 300 mA d c Any tests that exceed these limits are disabled 0 or 180 testing 0 or 180 is selected by pressing the BLUE button on the side of the MFT1501 1502 on either the 1 21 I 5I or DC RCD test The I 5I and DC RCD tests should be performed at 0 and 180 and the greater trip time recorded RAMP TEST f The RCD trip current is measured by applying a test current of half the rated trip current and increasing this every 200 ms When the RCD trips the current flowing is recorded and displayed in mA To determine the trip current of an RCD 1 Select the appropriate RCD rated current on the right hand rotary switch Select the RAMP l test on the left hand range knob Press the YELLOW TEST button The trip current is displayed O o gon DS If the RCD fails to trip gt mA will be displayed where indicates the last test current applied DC SENSITIVE RCD TEST RCD D C sensitive RCDs are tested with a pulsed waveform The RMS current is V2 x the rated operating current of the RCD As with the normal RCDs these should be tested with 0 and 180 polarity 1 Select the appropriate RCD rated current on the right hand rotary switch 2 Select the DC test on the left hand range
7. Megger MFT1500 Series Multifunction Tester USER MANUAL A WARNINGS Safety Wamings and Precautions must be read and understood before the instrument is used They must be observed during use m The circuit under test must be switched off de energised and isolated befor e test connections are made when carrying out insulation and continuity tests Continuity of protective conductors and earthed equipotential bonding of new or modified installations must be verified before carrying out an earth fault loop impedance test or RCD test Circuit connections and exposed metalwork of an installation or equipment under test must not be touched m The live circuit warning and Automatic discharge are additional safety features and should not be regarded as a substitute for normal safe working practices Do not change the rotary switch positions while a test is in progress The LCD neon voltage indicators cannot reveal a Neutral Earth reversal They cannot be relied upon to identify circuit correctness and are for guidance only After insulation tests capacitive circuits must be allowed to discharge before disconnecting test leads The instrument should not be used if any part of it is damaged m Test leads probes and crocodile clips must be in good order clean and with no broken or cracked insulation Ensure that hands remain behind guards of probes clips when testing m UK Safety Authorities recommend the use of fu
8. SPL1000 Order code 6220 770 6180 405 6220 606 6311 089 6231 593 6231 601 6220 643 6231 586 6420 143 6121 562 19 REPAIR AND WARRANTY The instrument contains static sensitive devices and care must be taken in handling the printed circuit board If an instrument s protection has been impaired it should not be used but sent for repair by suitably trained and qualified personnel The protection is likely to be impaired if for example it shows visible damage fails to perform the intended measurements has been subjected to prolonged storage under unfavourable conditions or has been subjected to severe transport stresses NEW INSTRUMENTS ARE GUARANTEED FOR 1 YEAR FROM THE DATE OF PURCHASE BY THE USER NOTE Any unauthorized prior repair or adjustment will automatically invalidate the Warranty INSTRUMENT REPAIR AND SPARE PARTS For service requirements for Megger Instruments contact Megger Limited or Archcliffe Road Megger Valley Forge Corporate Centre Dover 2621 Van Buren Avenue Kent CT17 9EN Norristown PA 19403 England U S A Tel 44 0 1304 502 243 Tel Fax 44 0 1304 207 342 1 610 676 8579 Fax 1 610 676 8625 or an approved repair company 20 Approved Repair Companies A number of independent instrument repair companies have been authorised for repair work on most Megger instruments using genuine Megger spare parts Consult the Appointed Distributor Agent regarding spare parts repa
9. cted between their respective two wires the neon s will activate L PE N PE LN Qe Correct supply indication e Live Neutral swapped Any other combinations should be investigated further However the LCD NEONS cannot be relied upon to identify circuit correctness and are for guidance only Note The presence of a voltage between phase and earth does not prove earth continuity as the earth could have a high resistance and a voltage would still be measured To test earth continuity refer to the sections on loop resistance or RCD testing Waming The LCD Neons are invalid when using the two wire lead set and should be ignored ILLUMINATED SWITCHED PROBE SPL1000 MFT1502 ONLY The Illuminated switched probe accessory replaces the RED 4 mm test lead It can be used anywhere that the 4 mm lead set is specified in this user guide Operation The YELLOW button duplicates the function of the TEST key on the instrument allowing quick and easy testing The BLACK switch operates a white LED which illuminates the probe tip for use when testing under low light levels There is also a visual indication via a red green LED to notify the user of the display status the meanings are as follows Green A valid result is present on the display or the continuity buzzer is buzzing Red A waming is being shown on the display testing will be inhibited VOLTAGE MEASUREMENT V TEST LEAD CONNECTION OPTION 1 OPTION 2
10. e sharp prods and press these firmly into the conductors being measured INSULATION RESISTANCE MQ 250 V 500 V 1000 V Waming Prior to any insulation testing ensure the circuits under test are isolated and not live TEST LEAD OPTION 1 OPTION 2 CONNECTION gt wire lead Switched set probe Set the left hand rotary range knob to the required INSULATION Range 250 V Insulation measurement to 99 9 MQ 500 V Insulation measurement to 299 MQ 1000 V Insulation measurement to 499 MQ The position of the right hand rotary range knob does not matter To initiate insulation testing press and hold the YELLOW TEST button on the instrument or the switched probe if connected Release the test button after the displayed reading has settled TEST LOCK To lock down the test button press the YELLOW TEST button followed by the RED LOCK F button A warning triangle AN will appear in the display while the test lock is active Press the YELLOW TEST button to stop the test Note A 1000 V warning is displayed whenever the 1000 V range is selected and the test button pressed Waming The test voltage will be permanently present on the test probes or crocodile clips when in the locked modes Notes Auto discharge Auto discharge facility automatically and safely discharges connected circuit after test via 250 kQ resistor Live circuit waming operates when connected to Live circuits gt 25 V Test Inhibited an audible ala
11. ir facilities and advice on the best course of action to take Returning an Instrument for Repair If retuming an instrument to the manufacturer for repair it should be sent freight pre paid to the appropriate address A copy of the invoice and of the packing note should be sent simultaneously by airmail to expedite clearance through Customs A repair estimate showing freight return and other charges will be submitted to the sender if required before work on the instrument commences M egger Limited Archcliffe Road Dover Kent CT17 9EN ENGLAND T 44 0 1 304 502101 F 44 0 1 304 207342 Megger Valley Forge Corporate Center 2621 Van Buren Avenue Norristown PA 19403 USA T 1 610 676 8500 F 1 610 676 8610 This instrument is manufactured in the United Kingdom The company reserves the right to change the specification or design without prior notice Megger is a registered trademark Part No 6172 xxx VO1 Printed in England 0503 www megger com Megger 4271 Bronze Way Dallas TX 75237 1017 USA T 1 800 723 2861 T 1 214 330 3203 F 1 214 337 3038 Megger SARL 29 All e de Villemomble 93340 Le Raincy FRANCE T 433 0 1 43 02 37 54 F 33 0 1 43 02 16 24 Megger OTHER TECHNICAL SALES OFFICES Toronto CANADA Mumbai INDIA and BAHRAIN Megger products are distributed in 146 countries worldwide
12. ive socket outlet OVERVIEW OF MFT1500 SERIES ORANGE BUZZER THRESHOLD BLUE 02 180 YELLOW TEST BUTTON BLACK BACKLIGHT RED TEST LOCK Test selection RCD range selection Display Battery cover side panel Connection indicators Contact Noise waming Fuse warming a Battery status Mm Ee ohh r a Temperature 7 a LH FAD 3N J warning Continuity and ret ees insulation connections Mains plug test Switched probe ied REPLACING FUSES AND BATTERIES Battery and Fuse fitting Replacement Battery type 8 x 1 5 V Alkaline LR6 AA Fuse type 500 mA F HBC 10 kA 500 V Low battery warning symbol Fuse blown symbol To test battery condition With the MFT1500 switched to the OFF position press the RED E test lock and the YELLOW TEST button together The battery voltage is displayed If the battery symbol also appears the batteries need replacing To replace batteries Switch off the instrument and disconnect the instrument from any electrical circuits Remove the battery cover Slide out the battery clip and remove the dead cells Refit new batteries following correct polarity as marked on the battery holder Replace the battery holder and cover Note Incorrect battery cell polarity can cause electrolyte leakage resulting in damage to the instrument To replace the fuse Should the main fuse fail the symbol will be displayed Disconnect the instrument from any circuit
13. knob Press the YELLOW TEST button The trip time will be displayed in ms oO e W If the RCD fails to trip gt 200 ms will be displayed Method of measurement The two wire lead or plug should be used for this measurement A constant current source is connected across the supply and the time taken for the supply to trip is measured by the instrument in ms Possible sources of error Measurement results can be affected by the following m Significant operating errors can occur if loads particularly rotating machinery and capacitive loads are left connected during tests A poor connection to the circuit under test Thermal Protection The RCD circuit has thermal protection fitted to prevent overheating in the event of multiple ramp tests being performed The symbol or the message Hot will be displayed Allow the instrument time to cool down before continuing 15 TECHNICAL SPECIFICATIONS Electrical specification Voltage range The voltage will enable the user to ascertain if a system is live prior to testing Accuracy 2 2 digits Voltage a c 000 V 500 V 50 60Hz Voltage d c 000 V 500 V Indication of polarity above 10 V Insulation ranges to EN 61557 2 Accuracy 2 2 digits up to 99 MQ Short circuit current lt 2 mA 1 mA at min pass value of insulation specified in BS7671 HD384 and IEC364 250 V 0 01 99 9 MQ 500V 0 01 299 MQ 1000 V 0 01 499 MQ 250 V 500 V and 1 kV into 1 mA load
14. mA loop test High Current Loop test O O o o oo WAAAONAIINANANTIAAAADAAH DAAA DAVAO KF SPH KKH LS LS YW P N and P P loop test PSC Residual Current Device RCD testing 14 1 21 I 5x I 0 amp 180 Ramp testing DC Sensitive RCDs 15 Technical specification 16 Accessories 19 Repair and Warranty 20 Symbols used on the instrument are AX AN o C Caution risk of electric shock Caution refer to accompanying notes Equipment protected throughout by Double Insulation Class II Equipment complies with current EU directives Maximum nominal system voltage of 500 V Max 300 V Maximum 300 V a c CAT III to Earth DESCRIPTION Thank you for purchasing the MFT1500 Multifunction Tester The MFT1500 series of tester is compact and designed to perform all of the functions required by the electrical contractor to fully test domestic commercial and industrial wiring Specially designed to comply with UK European and other Intemational wiring regulations and standards the MFT1501 and MFT1502 may be used on all single and three phase systems with rated voltages up to 300 Volts a c rms to earth ground All test leads supplied with the MFT1501 and MFT1502 form part of the measuring circuit of the instrument and must not be modified or changed in any way or be used with any other electrical instrument or appliance A plug severed from the power cord MUST be destroyed as a plug with bare conductors is hazardous in a l
15. n value The instrument will detect some sources of noise and warn the user where other instruments may give an incorrect reading Any leakage current as a consequence of other appliances connected to the supply under test may affect the reading If filter capacitors etc Test results may be adversely affected by supply voltage fluctuations or electrical noise during a measurement It is recommended that tests are repeated and the results verified if measurement results are considered abnormal Errors can be reduced by m The two wire lead set with prods and make a firm connection to clean conductors m Several tests and take the average value Ensure that potential sources of noise in the installation are isolated switched off eg automatically switched loads or motor controllers Ensuring that the instrument is calibrated Thermal Protection To protect the MFT1501 and MFT1502 from overheating during Loop testing thermal protection is fitted If the message HOT appears in the display when loop testing the instrument must be allowed to cool down before further attempts are made at loop testing 13 RESIDUAL CURRENT DEVICE RCD TESTING OPTION 1 OPTION 2 OPTION 3 2 wire lead Switched Mains plug set probe test lead The MFT1501 and MFT1502 can perform the following RCD tests 14 1 21 Non tripping test at half the rated RCD trip current for 2 seconds during which the RCD should not trip I Tri
16. nges to EN 61557 6 Supply 100 V 270 V 45Hz to 65Hz Ranges 1000 mA 500 mA 300 mA 100 mA 30 mA 10 mA Type 1 21 1 2 times the selected current I One times selected current ol Five times I current I trip A ramp test that displays actual trip current DC sensitive A DC test current at I current Current accuracy 1 21 8 to 2 I 2 to 8 DI 2 to 8 Intrinsic Accuracy of ramp test current 3 Trip time accuracy 1 1 ms Remote Probe MFT1502 only Optional on MFT1501 Torch featur e 5 mm White LED 1500 mcd Safety CLASS 1 LED to IEC 60825 2001 Interchangeable tips Lengths 30 mm GS38 112 mm GS38 Battery 9 V PP3 Red Green LED RED indicates that the instrument is displaying a warning eg volts on an insulation range GREEN indicates that the display on the instrument is valid or that the Continuity Buzzer on the instrument is sounding Power Supply Instrument 8 x 1 5 V Alkaline cells type LR6 AA cells Illuminated switched Probe 1 x 9 V Alkaline cell type PP3 6LR61 Fuses Instrument Replaceable 500 mA F HBC 10 kA 500 V Non replaceable 7 A SIBA 70 065 63 x 2 Non replaceable 1A 17 Probe Non replaceable 7 A SIBA 70 065 63 Safety Double insulated to IEC1010 1 2001 Installation Category III 300 V phase to earth 500 V phase to phase In addition Probe designed to meet IEC 1010 031 2002 Double insulated to Installation Category III 300 V phase to earth 500V phase to pha
17. pping test at the rated RCD trip current The trip time will be displayed 5I Tripping test at 5 x the rated RCD trip current The trip time will be displayed in milliseconds DC Tripping test for DC Sensitive RCDs 0 or 180 Some RCDs are sensitive to the polarity of the supply i e whether the test current is applied with the instantaneous voltage rising or falling Trip tests should therefore be performed with both polarities 0 and 180 and the maximum time recorded Ramp Test Used to check the trip current of an RCD Note The Breaker symbol indicates whether the test function selected is a NON TRIPPING or TRIPPING test CLOSED NON TRIPPING test OPEN TRIPPING test 1 2 I RCD Testing Set the LEFT RCD rotary range knob to the 1 21 RCD test range Set the RIGHT mA rotary range knob to current rating of the RCD under test Test lead set OPTION 1 2 or 3 1 Ensure the right hand Rotary knob is set to the correct range for the RCD under test 2 Press the YELLOW TEST button 3 After 2 seconds the message gt 1999 ms is displayed If the RCD trips unexpectedly the message trP will be displayed 1 x I RCD Testing Set the LEFT RCD rotary range knob to the I RCD test range 1 Press the YELLOW TEST button 2 The RCD trip time is displayed 3 If the RCD fails to trip gt 200 ms is displayed indicating a failed test 5 x I RCD Testing Set the LEFT RCD rotary range knob to the 5
18. rm operates at gt 55 V The instrument will not perform a test until the voltage source has been removed Method of measurement A current limited 2 mA d c source is used and the resistance is calculated from measurements of the voltage and current The voltage is only present when the test button is pressed or the test lock is active A measurement of the terminal voltage is made before the test and if this exceeds 55 V the test is disabled The reading is stable with a circuit capacitance up to 5 pE LOOP IMPEDANCE LOOP TESTING Loop impedance measurement can be made via installation sockets using the plug terminated test lead OPTION 3 or at any other convenient point on the installation using a two three wire lead set OPTION 1 OR 2 The MFT1501 and MFT1502 will measure the loop resistance from the supply end of the standard test leads allowing for their resistance NON TRIPPING LOOP TESTS NO TRIP Set the LEFT rotary range knob to the required LOOP range as described below OPTION 1 OPTION 2 OPTION 3 3 wire Switched Mains plug measurement Probe test lead PLUG The position of the right hand rotary range knob does not matter NO TRIP LOOP TESTING SINGLE PHASE TESTING ONLY The NO TRIP loop test is a high resolution low current earth loop resistance measurement Loop L PE 0 01 Q range which does not trip RCDs with a rated current 30 mA or higher NO TRIP PHASE TO EARTH LOOP IMPEDANCE MEASUREMENT AT A POWER
19. s Remove the battery cover as above The blown fuse should be replaced with a 500 mA F HBC 10 kA 500 V fuse Megger part no 25950 039 Replace the battery cover OPERATION GENERAL OPERATION Note These functions are generally apply and not limited to an individual test function Live circuit waming Test Inhibit Testing is automatically inhibited if During insulation testing an external voltage gt 55 V is present on the terminals During continuity testing a voltage gt 10 V is present on the terminals During RCD or No Trip loop testing a voltage gt 270 V is present During Loop testing a voltage gt 480 V is present Test button lock To lock the test button hold down the RED T test lock button whilst holding down the YELLOW TEST button Intelligent Backlight MFT1502 only Both the display and range knobs have a backlight To activate press the BLACK 5 button To disable the Intelligent backlight function press the BLACK 9 button and the RED E lock button together Repeat to enable the intelligent backlight Instrument Auto shut of f Automatically activated after 5 minutes of instrument inactivity To restore operation press the RED lock button or switch the instrument off and on Polarity Indication If connected to a single phase power supply by a plug or by the 3 wire lead set three LCD neons marked L PE N PE and L N respectively will indicate supply polarity If a voltage is dete
20. se EMC In accordance with IEC61326 including amendment No 1 Environmental Operating range 5 to 40 C Operating Humidity 90 RH at 40 C max Storage temperatur e 25 to 65 C Maximum altitude 2000 m Dust and water protection Instrument IP54 Probe no rating 18 TEC61557 Complies with the following parts of 61557 Electrical safety in low voltage systems up to 1000 V a c and 1500 V d c Equipment for testing measuring or monitoring of protective measures Part 1 General requirements Part 2 Insulation resistance Part 3 Loop resistance Part 4 Continuity Part 5 Earth test Part 6 Residual current devices RCD Part 10 Combined measuring equipment ACCESSORIES Product Multifunction Tester Standard Multifunction Tester with Illuminated switched probe Accessories included with MFT1501 Quick start guide 3 wire test lead Crocodile clips red black and green Probes Red Black Mains plug BS1363 test lead CD including full User Guide Additional accessories with MFT1502 As MFT1501 plus Illuminated switched probe Instrument document carry case Order Code MFT1501 MFT 1502 Optional accessories Replacement 3 wire test lead set Fused prod and clip set Standard switched probe Illuminated switched probe Test lead with Schuko plug Test lead with UK mains plug Test lead with USA mains plug Farth bond test lead set Instrument Document carry case Replacement Probe Tip Set for
21. sed test leads when measuring voltage on high energy systems m Replacement fuses must be of the correct type and rating Failure to fit the correctly rated fuse will result in damage to the instrument in the event of an overload m The battery cover must be in place whilst conducting tests NOTE THE INSTRUMENT MUST ONLY BE USED BY SUITABLY TRAINED AND COMPETENT PERSONS Users of this equipment and or their employers are reminded that Health and Safety Legislation requires them to carry out valid risk assessments of all electrical work so as to identify potential sources of electrical danger and risk of electrical injury such as inadvertent short circuits Where the assessments show that the risk is significant then the use of fused test leads constructed in accordance with the HSE guidance note GS38 Electrical Test Equipment for use by Electricians should be used 2 CONTENTS Safety Warnings Description Overview of MFT1500 Series Instrument Layout Display Control Panel Front switch panel Connection panel Test Leads Battery fuse warning fitting and replacement Operation General operation Live circuit warning Test button lock Backlight MFT1502 only Auto shut off Polarity indication Illuminated Switched Probe Operation Voltage measurement V Continuity Continuity measurement Lead Null Continuity Buzzer Buzzer threshold Insulation Insulation resistance Insulation Voltage ranges Test lock Loop impedance NO TRIP 15
22. the RED lead to PHASE 2 Supply voltage is displayed Waming The LCD Neons are invalid when using the two wire lead set and should be ignored 3 The test will automatically start when voltage is detected 4 Measured loop value is displayed If desired the test can be repeated by pressing the YELLOW TEST button BONDED METALWORK TESTING Test Lead set OPTION 1 or 2 1 Connect the GREEN lead to the bonded metalwork 2 Connect the RED lead to PHASE 3 Supply voltage is displayed Waming The LCD Neons are invalid when using the two wire lead set and should be ignored 4 The test will automatically start when voltage is detected 5 Measured loop value is displayed If desired the test can be repeated by pressing the YELLOW TEST button PHASE NEUTRAL OR PHASE PHASE LOOP IMPEDANCE Test Lead set OPTION 1 or 2 1 Connect the GREEN lead to NEUTRAL and the RED lead to PHASE or the 2nd PHASE for Phase to Phase loop measurement 2 The supply voltage is displayed Waming The LCD Neons are invalid when using the two wire lead set and should be ignored 3 The test will automatically start when voltage is detected 4 Measured loop resistance is displayed If desired the test can be repeated by pressing the YELLOW TEST button 11 PROSPECTIVE SHORT CIRCUIT CURRENT PSC OPTION 1 OPTION 2 2 wire measurement Switched probe Set the instrument to the PSC range PSC is a 25 A two wire test
23. yed to indicate lead null is active This null value is stored until the YELLOW TEST button is pressed again To cancel the LEAD NULL press the YELLOW TEST button Continuity Buzzer gt Test leads OPTIONS 1 or 2 above The MFT1500 buzzer will sound continuously if the resistance between the leads is less than a set limit Default value 2 Q If being used with the illuminated switched probe OPTION 2 continuity is also indicated by a GREEN LED on the probe To turn off the buzzer press the TEST button whilst in BUZZER mode The display will indicate ON or OFF status Buzzer threshold The resistance at which the buzzer stops sounding can be changed to meet individual test requirements Press the ORANGE TA button to select the resistance limit Selectable limits of 2 Q 5 Q 10 Q 20 Q 50 Q and 100 Q This setting is stored even when the instrument is switched off Notes Method of measurement The 2 wire lead set must be used for this measurement The instrument produces a d c voltage of nominally 4 5 V with a current limit of at least 8 200 mA when measuring 2 Q Possible sources of error Measurement results can be affected by the following The impedance of operating circuits connected in parallel Impedance such as inductors that vary during the measurement A poor connection to the circuit under test which can give readings as much as 100 mQ 0 10 Q high The best way to avoid this error is to us
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