MEGGER® BMM80 Series Insulation Multimeters User Guide
Contents
1. Select the uF range 2 Disconnect the test leads from the circuit under test 3 When the reading has stabilised press the TEST button The zero offset symbol Oy will appear 4 To release the zero offset press the TEST button again Using the MEGGER SP1 Switched Probe Operation The MEGGER SP1 is an accessory for designated MEGGER installation test instruments When fitted in the specially designed connector in place of the existing Low lead the SP1 acts as a remote test button to operate the instrument and as a Low probe This simplifies instrument control and two handed probing The SP1 is suitable for use with MEGGER insulation test instruments up to 1kV output test voltage Safety Meets the safety requirements for double insulation to IEC 1010 2 031 1995 EN61010 2 031 1995 IEC1010 1 1995 EN61010 1 1995 Category III 300V phase to earth and 500V phase to phase The probe is fitted with an internal non replaceable fuse to protect the user should the probe be used accidentally in conjunction with a test lead in the low terminal Relates to transient overvoltage likely to be found in fixed installation wiring Do not use the probe if any part of it is damaged Battery Replacement When the low battery symbol appears the cells are nearly exhausted and should be replaced as soon as possible Use Alkaline cells IEC LR6 AA or NiCd rechargeables To install or replace the cells disconnect the test2. The company reserves the right to change the specification or design without prior notice MEGGER is the registered Trade Mark of AVO INTERNATIONAL LIMITED Parts of this instrument are patented Copyright AVO INTERNATIONAL LIMITED Part No 6172 427 Edition 2 Printed in England 12EE
3. resulting leakage current The circuit under test must be completely de energised and isolated before test connections are made Insulation tests are only initiated when the TEST button is pressed 1 Set the range switch to the test voltage required 2 Connect the test leads first to the instrument and then to the isolated item under test 3 Press the TEST button to activate the test voltage Take the reading 4 Release the TEST button at the end of the test The last reading will hold on the display 5 Any capacitive circuits charged during a test will automatically discharge If significant voltage remains the voltage warning will occur and the voltage present displayed 6 Remove the test leads only when no voltage is indicated Locking Test Button Itb When it is desired to do a long insulation test the test can be locked on by pressing the key while the TEST button is held down The warning i will appear on the display and both buttons may be released whilst the test continues 7 The next press of the test cS i button will terminate the test Note There is a safety delay of a few seconds on the first operation of FIG 1 1000V range each time the range is selected Polarisation Index Testing Polarisation Index PI is the term applied to the Dielectric Absorption Ratio when resistance values are measured after 1 minute and again after 10 minutes Polarisation Index is then t
4. 6 0 60 0 54 20 00 18 8 0 70 0 63 30 00 28 4 0 80 0 73 40 00 38 0 0 90 0 82 50 00 47 6 1 00 0 92 100 00 92 0 SAFETY The instruments meet the requirements for double insulation to IEC 1010 1 1995 EN 61010 1 1995 to Category III 300V phase to earth ground and 440V phase to phase without the need for separately fused test leads If required fused test leads are available as an optional accessory Relates to the transient over voltages likely to be met in fixed wiring installations Complies with the following parts of EN61557 Electrical safety in low voltage systems up to 1000V a c and 1500V d c Equipment for testing measuring or monitoring of protective measures Part 1 General requirements Part 2 Insulation resistance Part 4 Resistance of earth connection and equi potential bonding FUSE 500mA F 500V 32x 6mm Ceramic HBC 10kA minimum E M C The instruments meet EN 61326 1 POWER SUPPLY Battery Type 6x1 5V Alkaline cells IEC LR6 type or 1 Battery Life typical 2V NiCd re chargeable cells 2100 5 sec 1kV insulation tests 3200 5 sec 500V insulation tests 4000 5 sec 250V insulation tests 2700 5 sec continuity tests 4700 5 sec kQ tests ENVIRONMENTAL CONDITIONS Operating range Operating humidity Storage temperature range Calibration Temperature Maximum altitude Dust and water protection Temperature coefficient WEIGHT DIMENSIONS CLEANING 5 to 40 C 90 RH
5. MEGGER BMMSO Series Insulation Multimeters User Guide AY SAFETY WARNINGS Safety Warnings and Precautions must be read and understood before the instrument is used They must be observed during use The circuit under test must be de energised and isolated before connections are made except for voltage measurement Circuit connections must not be touched during a test After insulation tests capacitive circuits must be allowed to discharge before disconnecting the test leads The Live Circuit Warning and Automatic Discharge are additional safety features and should not be regarded as a substitute for normal safe working practice 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 Test leads including crocodile clips must be in good order clean and have no broken or cracked insulation Ensure that hands remain behind guards of probes clips when testing U K Safety Authorities recommend the use of fused test leads when measuring voltage on high energy systems NOTE THE INSTRUMENTS 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 require 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 from inadverte
6. Q Note Above specifications only apply when high quality silicone leads are being used Measuring Range 0 01MQ to 200GQ 100GQ on analogue scale EN61557 Operating range 0 10MQ to 1 00GQ CONTINUITY Measuring Range 0 01 to 99 9Q 0 to 109 on analogue scale EN61557 Operating range 0 10Q to 99 9Q Accuracy 2 2 digits Open circuit voltage 5V 1V Test current 210mA 10mA 0 29 Zero offset at probe tips 0 10Q typical Lead resistance zeroing Up to 9 99Q Noise rejection 1V rms 50 60Hz Buzzer Operates at less than 5Q approx RESISTANCE Measuring Range 0 01kQ to 9 99MQ 0 to 100MQ on analogue scale Accuracy 3 2 digits Open circuit voltage 5V 1V Short circuit current 25A 5yA VOLTAGE Measuring Range 1V to 500V 0 to 1000V on analogue scale Accuracy 0 to 500V d c 2 3 digit 0 to 500V a c 50 60Hz 2 3 digits 0 500V 400HZ a c 5 3 digits MILLIVOLTS Measuring Range 0 1mV to 1999mV 0 to 1000mV on analogue scale Accuracy 0 1mV to 10mV d c or a c 50 60Hz 2 5 digits 10mV to 1999mV d c or a c 50 60 Hz 2 3 digits 0 1mV to 10mV a c 16 460 Hz 5 7 digits 10mV to 1999mV a c 16 460 Hz 5 5 digits d c milliVolts zeroing Up to 9 9mV Input resistance gt 3MQ CAPACITANCE Measuring Range 0 1nF to 9 99uF Accuracy 3 2digits 0 2nF uF zeroing up to 10nF Basic and service errors for Insulation and Resistance ranges The basic error is the maximum inaccuracy of th
7. a facility to measure capacitance on the BMM80 this can be used in some types of telecommunications applications for fault analysis A customised connector on the top of the instrument enables the optional MEGGER SP1 Switched Probe to be used for two handed probe operation The 250V 500V and 1000V ranges can be used to test electrical installations in compliance with BS7671 16th Edition IEE Wiring Regulations IEC364 and HD384 since each range has a 1mA minimum test current at the minimum pass values of insulation specified in these documents The 100V range is ideal for testing telecommunications equipment which would be damaged by higher voltages The 50V range is useful for testing sensitive equipment such as electronic components and computer peripherals Designed to IEC1010 1 the BMM80 Series are protected against connection to a 500V Category III supply The instruments have a basic accuracy of 2 at 20 C The instruments are waterproof and dustproof to IP54 This helps maintain accuracy and ensures maximum reliability in harsh environments OPERATION Ay Refer to Safety Warnings before using the instrument Testing is automatically inhibited if An external voltage gt 25V is present when switched to any insulation range position An external voltage gt 10V is present on all other ranges excluding OFF V mV The external voltage is indicated on the display on insulation ranges an audible bleeper will sound if a
8. at 40 C max 25 to 65 C 20 C 2000m IP54 lt 0 1 per C 742g 110mm x 220mm x 45mm Wipe with a clean cloth damped with soapy water or Isopropyl Alcohol IPA ACCESSORIES Supplied Test lead set Test and Carry case Optional Fused lead set FPK8 Switch Test Probe SP1 Test Record Cards Pack of 20 Publications A Stitch in Time Testing Electrical Installations Part Number 6220 437 6420 123 Part Number 6111 218 6220 606 6111 216 AVTM21 P8B 6172 129 REPAIR AND WARRANTY The instrument circuit contains static sensitive devices and care must be taken in handling the printed circuit board If the protection of an instrument has been impaired it should not be used and be sent for repair by suitably trained and qualified personnel The protection is likely to be impaired if for example the instrument shows visible damage fails to perform the intended measurements has been subjected to prolonged storage under unfavourable conditions or has been exposed to severe transport stresses New Instruments are Guaranteed for 3 Years 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 AVO INTERNATIONAL or AVO INTERNATIONAL Archcliffe Road Valley Forge Corporate Center Dover 2621 Van Buren Avenue Kent CT17 9EN No
9. e instrument under ideal conditions whereas the service error is the maximum inaccuracy taking into effect of battery voltage temperature interference and system voltage and frequency where applicable After determining the service error we can then calculate the measurement range This is the range of measurement over which the error in service is less than 30 of the reading Digital instruments are affected by the number of digits error for example a value 0 102 measured with the continuity range may give a display in the range 0 07Q to 0 13Q which is a maximum error of 30 Therefore the measurement range measuring low resistance is 0 10Q to 99 9Q When checking that a measurement does not exceed a limit the service error needs to be taken into account and these tables enables this to be done quickly and easily These will guarantee that the value being measured is greater than or less than the limit value specified as appropriate Insulation Resistance MQ Limit Min Indicated Limit Min Indicated Reading Reading 0 10 0 14 2 00 2 12 0 20 0 25 3 00 3 16 0 30 0 35 4 00 4 20 0 40 0 46 5 00 5 24 0 50 0 56 10 00 10 8 0 60 0 66 20 00 21 2 0 70 0 77 30 00 31 6 0 80 0 87 40 00 42 0 0 90 0 98 50 00 52 4 1 00 1 08 100 00 94 0 Continuity Resistance Q Limit Max Indicated Limit Max Indicated Reading Reading 0 10 0 06 2 00 1 88 0 20 0 15 3 00 2 84 0 30 0 25 4 00 3 80 0 40 0 34 5 00 4 76 0 50 0 44 10 00 9 5
10. he resistance value after 10 minutes divided by the resistance value after 1 minute The test can be run at any voltage More detailed information on PI Testing and value assessment can be found in AVO International publications listed in the Accessories page Automatic Discharge When the TEST button is released after an insulation test or re pressed if Itb feature is enabled a 200kQ load is automatically switched across the terminals to discharge the item under test Any voltage present will be indicated on the display so that the discharge can be monitored TYPICAL TERMINAL VOLTAGE CHARACTERISTICS AILT geli Continuity Testing Q See fig 2 The continuity tests are activated when the probes make contact of less than a few kQ The tests apply a constant current and measure the resulting volt drop across the circuit under test The test operates without the need to press the TEST button When the test leads are removed the reading will hold for a few seconds and then reset This range is not suitable for diode testing since the automatic contact detector will not be activated when connected to 1 a diode 1 Set the selector switch to Q Connect the test leads 2 3 The test will activate automatically 4 After the test probes are disconnected the reading will be held for a few seconds Zeroing of Test Lead Resistance The resistance of the test leads can be FIG 1 nulled on the contin
11. leads switch the instrument to OFF and loosen the captive screws on the rear of the battery compartment Remove the cover and disconnect the battery holder from the battery leads Ensure that the replacement cells are fitted with the correct polarity in accordance with the label in the battery holder Reconnect the battery holder to the battery leads Replace and re secure the battery compartment cover Remove the cells if the instrument is not going to be used for an extended period of time Fuse Checking and Replacement To check the instrument fuse switch to an insulation range and press the TEST button The symbol will appear if the fuse is ruptured To replace the fuse disconnect the test leads switch the instrument OFF and loosen the captive screws holding the battery compartment cover in place Remove the cover and replace the fuse Replace and re secure the battery compartment cover SPECIFICATION All quoted accuracies are at 20 C INSULATION RANGES Nominal Test Voltage d c 50V 100V 250V 500V 1000V Test voltage accuracy 15 maximum on open circuit Short circuit current lt 2mA Test Current on load 1mA at min pass value of insulation specified in BS7671 HD384 and IEC 364 2mA max Accuracy Range Full Scale Accuracy 1000V 200GQ 2 2 digits 0 2 per GQ 500V 100GQ 2 2 digits 0 4 per GQ 250V 50GQ 2 2 digits 0 8 per GQ 100V 20GQ 2 2 digits 2 0 per GQ 50V 10 GQ 2 2 digits 4 0 per G
12. n even if the fuse is blown If the voltmeter operation is in question test the voltmeter on a known source 1 Set the selector switch to V 2 Connect the test leads 3 After a short settling time the reading will be displayed automatically Millivolt Tests mV The measured a c or d c voltage is indicated on the display 1 Set the selector switch to mV 2 Select either a c or d c mV using the key 3 Connect the test leads 4 After a short settle time the reading will be displayed automatically Note Live circuit warning does not function on mV range Zeroing of d c mV no zero facility on a c mV Any standing offset on the d c mV range can be zeroed Up to 9 9mV The zero information is retained in non volatile memory and so will be remembered when the instrument is switched OFF 1 Select the d c mV range 2 Short the test leads together 3 When the reading has stabilised press the TEST button The zero offset symbol N will appear 4 To release the zero offsetpress the TEST button again Capacitance Tests uF The measured capacitance is indicated on the display 1 Set the selector switch to uF 2 Connect the test leads 3 After a short settling time the reading will be displayed automatically Zeroing of uF Offsets on the uF range can be zeroed Up to 10 0nF The zero information is retained in non volatile memory and so will be remembered when the instrument is switched OFF 1
13. nt 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 Symbols used on the instruments are An Caution risk of electric shock Ay Caution refer to User Guide Equipment protected throughout by Double Insulation Class II CE Equipment complies with current EU Directives Equipment must not be connected A gt V to installations gt 500V GENERAL DESCRIPTION The MEGGER BMM680 Series instruments are battery powered Insulation and Continuity testers with a measurement capability from 0 019 Continuity to 200GQ Insulation Offering multi voltage facilities the instruments take full advantage of microprocessor technology and feature a large liquid crystal display combining digital and analogue readings The analogue display has the benefit of indicating trends and fluctuations in readings while the digital readout gives direct accurate results The display is also backlit giving clear visibility even in low light conditions The BMM80 Series instruments have the unique capability of being able to measure voltages down to a resolution of 0 1mV This gives the user the option to fit a wide variety of transducers to further enhance the capabilities of the BMM Series instruments e g temperature or humidity measurement There is also
14. rristown PA 19403 England U S A Tel 44 0 1304 502243 Tel 1 610 676 8500 Fax 44 0 1304 207342 Fax 1 610 676 8625 or an approved repair company Approved Repair Companies A number of independent instrument repair companies have been approved for repair work on most MEGGER instruments using genuine MEGGER spare parts Consult the Appointed Distributor Agent regarding spare parts repair facilities and advice on the best course of action to take Returning an Instrument for Repair If returning 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 Avo AVO INTERNATIONAL Archcliffe Road Dover Kent CT17 9EN Tel 44 0 1304 502100 England Fax 44 0 1304 207342 4651 S Westmoreland Road Dallas Tel 1 800 723 2861 U S A only TX 75237 1017 Tel 1 214 330 3203 International U S A Fax 1 214 337 3038 PO Box 9007 Valley Forge PA 19484 9007 Tel 1 610 676 8500 U S A Fax 1 610 676 8610 MEGGER SA 29 All e de Villemomble 93340 Le Raincy Paris Tel 33 1 43 02 37 54 France Fax 33 1 43 02 16 24 This instrument is manufactured in the United Kingdom
15. test is attempted Live Circuit Warning When more than 25V is applied to the terminals in the insulation ranges the instrument defaults to a voltmeter will give an audible warning if a test is attempted On all other switch positions except OFF v mV when more than 10V is applied the default voltmeter will be activated Testing will be inhibited Voltage Testing on High Energy Systems Use extreme care when using or measuring voltages above 30V particularly in high energy systems Fused test leads are available as optional accessories for local situations where increased protection is required Auto shut Off To conserve battery life Auto shut Off preceded by a series of bleeps operates after approx 10 minutes of instrument inactivity on the insulation ranges 5 minutes on all other ranges If the instrument is switched on whilst holding the key the Auto shut off time is extended to 60 minutes To restore operation after Auto shut Off either select OFF followed by the required switch position Note It is recommended that the instrument is switched to the OFF position when not in use Backlight The backlight is activated by pressing the key The backlight will remain illuminated for approximately one minute before automatically switching off to conserve battery life alternatively the key can be re pressed Insulation Tests MQ See fig 1 The insulation tests apply a known voltage to the circuit under test and measure the
16. uity range up to 9 99Q The null information is retained in non volatile memory and so will be remembered when the instrument is switched off 1 Select the Continuity range 2 Short the test leads across a known good conductor using prods 3 When the reading has stabilised press the TEST button A short bleep will sound and the zero O offset symbol will appear 4 To release the zero offset press the test button again Possible sources of error Measurements and results can be effected 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 Continuity Bleeper N The continuity bleepe suunds continuously when less than 50 is detected Short bleeps will sound for resistances lower than a few kQ and above 5Q 1 Set the selector switch to A 2 Connect the test leads Display Audible lt 5Q continuous bleep lt 3kQ short bleep gt 3kQ no bleep Resistance Tests kQ This is a low voltage 5V low current 25y A test for sensitive electronic equipment It operates in the same way as the continuity ranges 1 Set the selector switch to KQ 2 Connect the test leads 3 The test will activate automatically Voltage Tests V If gt 1V a c or d c is present at the terminals the measured voltage is indicated on the display The voltage display will function within specificatio
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