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1. a circular la corriente de prueba seg n la indicaci n proporcionada por la luz verde Para conservar la carga de la bater a mantener el tiempo de prueba lo m s corto posible CARGA DE LA BATER A Ser necesario recargar la bateria cuando se encienda la luz de aviso de bajo voltaje bater a 1 Destapar el conector correspondiente al cargado de bater a 2 Colocar una clavija apropiada en el cable de alimentaci n del cargador verificando que el hilo de tierra de dicho cable comunique con tierra mientras se est cargando la bater a 3 Enchufar el cable al instrumento y conectarlo con una toma a red apropiada seguidamente conectar la tensi n de red 4 Dejartranscurrir 10 horas para que se cargue la bateria El aparato puede emplearse para efectuar pruebas en r gimen de carga siempre que la bater a no est completamente agotada y que sele haya dejado recuperar su tensi n durante un breve espacio de tiempo La red de alimentaci n no puede suministrar la corriente necesitada para la prueba a menos que est complementada por la bater a En estas condiciones pueden surgir problemas durante la medici n debido a interferencias en la red Ser preciso alargar la duraci n del per odo de carga sise ha de cargar la bater a coincidiendo con la realizaci n de la prueba El alargamiento de dicho per odo no ocasionar perjuicios a la bater a 5 Efectuada la carga interrumpir la alimentaci n de la red retirar el
2. d Die Hanspitzengarnituren auf die zu pr fenden Ger te bzw Leiter dr cken 5 Dengemessenen Widerstandswert von der Digitalanzeige ablesen 6 Das Uberlaufsymbol ist eine I auf der linken Seile der Digital Anzeige wobei die restlichen Ziffern gel scht bleiben Erscheint dieses Symbol bei Benutzung des 20 mQ Bereiches so Ist der 2000 mQ Bereich zu w hlen Bei Erscheinen des Symbols im 2000 mQ Bereich ist der gemessene Widerstandswert au erhalb des Ger te Me bereichs 7 Nach dem Test die Pr fspitzen abklemmen den W hlschalter auf Aus off stellen und die Pr fleitungen abtrennen ACHTUNG Wird das Instrument zur Pr fung einer induktiven Belastung verwendet trittan den Klemmen eine kurze Spannungs berh hung auf Dies ergibt sich wenn das Instrument von einem Mef bereich auf den anderen geschaltet wird oder die Pr fleitungen angeschlossen oder abgetrennt werden Das Instrument kann solchen Spannungsspitzen bei Messungen induktiver Lasten darunter auch der Pr fleitungen bis zu 250 mH standhalten VERWENDUNG ANDERER LEITUNGEN Bei Verwendung von Pr fstromleitungen mit Verbindungsklemmen und dergleichen sind die Verbindungen zuerst herzustellen und dann der Wahlschalter aus der Aus Stellung unmittelbar vor der Messung auf den entsprechenden Me bereich zu stellen Eine Anzeige wird erhalten bei Anschlu beider Spannungsverbindungen d h ber einzelne Hanspitzen bzw ber eine Hanspitze und eine Klemme S
3. 25484 519 LED 3 Light emitting diode green Part No 28863 282 DISPLAY P C B 1 Battery pack 7 2 V NiCD Part No 25511 844 R31 Resistor 1 KQ 2 2W R32 Resistor 47 kQ 2 2 W H33 Resistor 100 kQ x 2 W H38 Resistor 510 kQ 2 C11 Capacitor 220 nF 10 100V C12 Capacitor 47 nF 1096 250V C13 Capacitor 47 pF 2 63V C14 Capacitor 10 nF x 10 100V C15 Capacitor 100 pF 2 63V C18 Capacitor 47 nF 10 63V D9 Diode 1N4148 IC3 Integrated circuit ICL 7107CPL LED 3 Light emitting diode display Part No 28920 033 LED 4 Light emitting diode display Part No 28920 032 LED 5 Light emitting diode display Part No 28920 032 LED 6 Light emitting diode display Part No 28920 032 OTHER COMPONENTS FS1 Fuse 100mA T Part No 25950 042 N1 Neon indicator light Part No 25515 652 18 Circuit Diagram N1 1 Lem LED TRS 055 ty R 55 O E 34 2 xL Spb 2 el 015500 6 8 5 25 FS DNE IL jf 23 DISPLAY PCB ASSY 6331 247 L A wova TT vT pt tu s 9 mon Dam iE al o l amp R37 C R 23 GND RAIL 2k7 4 0 5 010 INS3378 ON TR5 CJ BC 213 TR2 BC 03 4007 FS 100mA r H MAIN ASSY 6630 133 R29 510R 2 0 5 A1 7270 5 KL 7907 CPL A7 51K 170 5 RT WK 2 0 1 R1 1X 1 0 5 Ale 150 270 5 R19 150R 2 9 5 R26 430R 2 0 5 R21 39R 52
4. For any of the C1 C2 P1 and P2 connections test leads terminated with bulldog clips or clamp connectors may be used Single handspikes are also suitable Alternative test leads are available from Megger Limited see Accessories page 15 The testing procedure as given above should be followed However it must be remembered when using fixed current connections that as soon as the connections are made and the circuit completed the test current will flow unless the selector switch is in the Off position Therefore in order to conserve battery power it is advisable whatever type of connections are used to keep the time for the test as short as possible With the fixed type of current connections keep the selector switch in the off position while the connections are made and until the test is ready to be performed CHARGING THE BATTERY If while performing a test the low battery voltage warning light illuminates the batteries must be recharged 1 Lift the battery charger socket cover to expose the charger socket 2 Connecta suitable three pin plug to the battery charger mains supply lead Ensure that the earth wire in the supply lead is connected so that the instrument is earthed when charging the battery 3 Plug the lead into the instrument and then into a convenient mains supply socket and switch on 4 Allow the battery to charge for 10 hours Note The instrument may be used to perform tests d
5. circuit potentiel 2 Mettre le s lecteur de gamme sur la position appropri e Appliquer les deux jeux de pointes de touche sur un morceau de m tal de faible r sistance de fa on ce que les pointes soient aussi pr s que possible les unes des autres L afficheur num rique doit indiquer z ro Remarque Le voyant vert est allum quand le courant d essai circule entre les bornes C1 et C2 4 Appliquer les pointes de touche sur l quipement ou le conducteur a tester 5 Lire la r sistance indiqu e par l afficheur num rique Un d passement de gamme est indiqu par un l l extr me gauche de l afficheur le reste de celui ci tant teint Si le signe de d passement apparait sur la gamme 20 mQ passer sur la gamme 2000 m S il persiste sur cette gamme ceci indique que la valeur de la r sistance mesurer est hors gammes de cet appareil 7 Apr s essai retirer les pointes de touche mettre le commutateur de s lection sur OFF Arr t et d brancherles cordons ATTENTION Quand on utilise l appareil pour effectuer des mesures sur charge inductive des surtensions peuvent apparaitre aux bornes de l appareil lors de changements de gamme ou quand on branche ou d branche les cordons de mesure L appareil est prot g contre ces ph nom nes pour des charges n exc dant pas 250 mH cordons de mesure inclus UTILISATION D AUTRES CORDONS Si l on utilise des cordons quip s de pinces il est important d t
6. 5 7 2N2905 e RW 1507279 5 R35 72K TRI 80183 br Ns 83 kt RIL 180 amp E VE RAIL 47pF 2 k R38 e 817 1068 2 0 R4 w 2 0 5 R3 22K 2 0 5 RS 24K 2 0 5 R28 5K 1 0 5 R30 6K5 1 0 5 R24 2K 1 0 5 Pen R2 22K 270 5 RAM 2 05 2 R34 4708 VE RAIL CIRCUIT REFERENCE CODING RESISTORS VALUE TOL WATTAGE CAPACITORS VALUE Z VOLTAGE D SWITCHES SWITCH 1 ROTARY SIAF WAFER A FRONT 19 Megger Limited Archcliffe Road Dover Kent CT17 9EN England T 0 1 304 502101 F 0 1 304 207342 OTHER TECHNICAL SALES OFFICES Megger 4271 Bronze Way Dallas Texas 75237 1019 USA T 1 800 723 2861 T 1214 333 3201 F 1214 331 7399 Megger Z A Du Buisson de la Couldre 23 rue Eug ne Henaff 78190 TRAPPES France T 130 16 08 90 F 134 61 23 77 Toronto CANADA Sydney AUSTRALIA Mumbai India Madrid SPAIN and the Kingdom of BAHRAIN Megger products are distributed in 146 countries worldwide This instrument is manufactured in the United Kingdom The company reserves the right to chan Megger is a registered Trade mark of Megger Limited Copyright O Megger Limited Megger is a registered trademark Part No 6170 921 EDITION 16 Printed in England 11HH www megger com ge the specification or design without prior notice Megger
7. 9EN Norristown PA 19403 England U S A Tel 44 0 1304 502243 Tel 1 610 676 8579 Fax 44 0 1304 207342 Fax 1 610 676 8625 or an approved repair company 16 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 Components List MAIN P C B Hesistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Potentiometer Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Potentiometer Potentiometer Resistor Resistor 1kQ 2 Vo W 22 kQ 2 V2 W 22 kQ 2 1 2 W 1MQ 2 Yew 24k 2 1 2 W 56Q 5 2 5W 100 kQ 2 1 2 W 1 6kQ 2 1 2W 10kQ 5 2W 150 kQ 2
8. cable de carga y cerrar la tapa del conector correspondiente al cargador 13 14 Circuit Description refer to circuit diagram MEASUREMENT AND DISPLAY The BT51 measures resistance ratiometrically detecting the current through and the voltage across the unknown resistance Rx and performing the sum Rx Vx Ix Because of this ratiometric method a constant current supply is not necessary and a current limit circuit is adequate The display is driven directly from the A D converter integrated circuit and the only additional items required are the integrating components C11 and R32 the auto zero capacitor C12 the reference capacitor C14 and the oscillator components C15 and R33 Measurement is performed by monitoring the voltage across the unknown at the input terminals of the A D converter and the voltage proportional to the current through the unknown and sensed across a manganin resistor R25 in series with the unknown at the reference terminals of the A D converter CURRENT LIMIT The current limiting circuit containing R13 R14 R15 R21 TR7 and TR9 maintains the test current at nominally 2 A R21 provides the base current to make TR9 conduct and a voltage drop occur across R13 R14 and R15 assuming the C leads are shorted When the voltage across these parallel resistors reaches the V of TR7 this transistor starts to conduct thus reducing the base current of TR9 The value of the parallel resistor combi
9. 12 W 10kQ 20 0 1W 12 2 1 2 W 19 5 2W 1040599 2W 6 596 ZW 150 2 1 2 W 1000 2 1 2 W 750 kQ 0 5 1 2 W 1500 2 1 2 W 430 Q 2 1 2 W 390 5 2 5W 30kQ 196 IAW 1 6kQ 1 1 2 W 2K 299 1 2 W 0 10 manganin part no 5160 067 2 KO 1 1 2 W 51 1 1 2 W 51 kQ 1 1 2 W 5100 x 2 1 2 W 6 8 kO 1 1 2 W 4700 20 0 75 W 22kQ 20 0 75W 510k0 2 1 2 W 510 kQ 2 1 2 W D12 D13 D14 D15 to D17 TRI TR2 TRS TR4 TRS TR6 TRZ TR8 Capacitor Capacitor Capacitor Capacitor Capacitor Capacitor Capacitor Capacitor Capacitor Capacitor Capacitor Diode Diode Diode Diode Diode Zener diode Zener diode Diode Diode Diode Zener diode Transistor Transistor Transistor Transistor Transistor Transistor Transistor Transistor 1 uF 20 63V 10uF 16 Velectrolytic AT OF 29e 69V AIDF 29 63V 10uF 16 Velectrolytic 47 pF 2 63V 100 nF 12V 100 nF 12V 47 pF 2 63 47 pF 2 63V 470 uF 20 16V 1N5400 1N4148 1N4007 1N4148 1N4004 1N5337 B 1N5337 B 1N4148 1N4004 1N4148 1N5346B BC183C BC183C BCZISE BEZISG BC213C BC183C 2N2905 BC183C 17 RE IC 1 Integrated circuit ICL 7660CPA N2 Neon indicator light Part No 25990 011 IC2 Integrated circuit ICL 7650CPD T1 Transformer Part No 6180 420 FS2 Fuse3 15A Part No 25413 280 EE LED 1 Light emitting diode red Part No 28863 281 RL1 Relay 6 V d c 1000 Part No
10. Digital Milliohmmeter BT51 USER GUIDE GUIDE DE L UTILISATEUR GEBRAUCHSANLEITUNG GU A DEL USUARIO Megger Safety Warnings Safety Warnings and Testing Precautions must be read and understood before the instrument is used They must be observed during use Circuit under test must be switched off de energised and isolated before any test connections are made Test leads and handspikes must be in good order clean and with no broken or cracked insulation Circuit connections must not be touched during a test The instrument must be earthed grounded when connected to a mains power source for battery charging Replacement fuses must be of the correct type and rating The instrument should not be used if any part of it is damaged Refer to pages 8 and 9 for further explanations and precautions _ NOTE THIS INSTRUMENTS MUST ONLY BE USED BY SUITABLY TRAINED AND COMPETENT PERSONS Contents __________ _ _ _____ Safety Warnings a General Description 5 Applications 6 Specification 7 Operation 8 Warning 8 The detachable lid 8 Performing a test 8 Using alternative leads 9 Charging the battery 9 Outline Diagram 10 Mode d Emploi 11 Kurzanweisungen 12 Instrucciones Resumidas de Uso 13 Circuit Description 14 Accessories 15 Repair and Warranty 16 Components List E Circuit Diagram 19 General Description The BT51 uses the four terminal measurement principle Current generated within the
11. ablir d abord le circuit courant puis de faire passer le s lecteur de la position OFF la gamme appropri e La lecture est obtenue quand les conducteurs de potentiel pointes de touche ou pinces sont mis en contact avec la structure en essal Le courant d essai circule entre C1 et C2 uniquement quand le circuit complet est tabli Le passage du courant est indiqu pour une illumination de voyant vert La dur e de l essai doit tre la plus courte possible afin de pr server l nergie des batteries CHARGE DES BATTERIES Les batteries doivent tre recharg es d s que le voyant avertisseur de tension minimum s allume 1 D gager le cache prise chargeur de batteries 2 Brancher dans cette prise le cordon d alimentation fourni et relier ce cordon au secteur par une prise munie d une borne de terre afin d assurer une mise la terre correcte de l appareil pendant la charge des batteries 3 Laisserles batteries en charge pendant 10 Heures L instrument peut tre utilis pour effectuer des mesures pendant la charge apr s toutefois un temps minimum de recharge En effet siles batteries sont compl tement d charg es l alimentation secteur n est pas suffisante pour fournir seule le courant n cessaire aux mesures D autre part des probl mes peuvent surgir dans les mesures cause des interf rences du r seau Dans ce type d utilisation un temps sup rieur de chargeest n cessaire mais il n y a aucun risque d endomma
12. amplifier the voltage across the unknown is attenuated by R22 and R26 and fed directly to the A D converter inputs The reference voltage IS obtained from R25 and R35 is used to adjust full scale On the 20 mQ range the voltage across the unknown is amplified by the integrated circuit IC2 This is a chopper stabilized op amp and is connected in the non inverting mode The gain is determined by R28 R23 and R24 and R34 IS used to adjust full scale C8 and C9 are required for storing correcting potentials The output of the amplifieris fed via R30 and R26 to the A D converter BATTERY LOW AND CHARGING CIRCUIT R10 R11 and R12 form an attenuator across the battery With normal battery voltage TR6 is conducting and TR8 non conducting so the L E D light L1 is off When the battery voltage is low TR6 stops conducting making TH8 conducting and L E D L1 illuminates D1 R6 and the mains transformer form the charging circuit Precautionary note The instrument circuit contains static sensitive devices If the instrument casing is opened for any reason this will automatically invalidate any warranty covering the instrument care must be exercised in handling the printed circuit boards This should be done in accordance with DEF STN 59 98 and BS 5783 specifications for handling electrostatic sensitive devices Accessories ACCESSORIES Supplied with the instrument Supply lead for battery charging Part No 25424 860 Duplex handspik
13. display El simbolo de sobre escala est constituido por la cifra I en el lado izquierdo permaneciendo eb blanco los digitos restantes Si se encuentra en uso el alcance de 20 mQ cuando aparezca el simbolo se debe pasar al alcance de 2000 mQ si se encuentra en uso el alcance de 2000 mQ la resistencia a determinar excede del alcance de medida del instrumento 7 Despu s de realizarla prueba situar el selector en off y desconectar los conductores de prueba ADVERTENCIA Cuando el aparato se utilice para medir una carga inductiva aparecer una tensi n par sita a trav s de los bornes Esto ocurre durante la conmutaci n entre m rgenes o al conectar o desconectar los conductores de prueba El aparato soportar las tensiones par sitas que se produzcan al medir oo cargas inductivas incluida la de los conductores de prueba m un m ximo de 250 mH EMPLEO DE CONDUCTORES ALTERNATIVOS Cuando se utilicen conductores de corriente de prueba con conexiones de pinza o clip ser necesario hacer primero las conexiones y despu s pasar el selector de la posici n off apagado al alcance de medida apropiado inmediatamente antes de efectuar una medida Se podr obtener una lectura despu s de establecer tambi n las dos conexiones de potencial por medio de puntas individuales o de una punta y un clip A menos que el selector se encuentre en la posici n de apagado tan pronto se establezca el circuito entre C1 y C2 empezar
14. ent has been turned on prior to the probes being placed across the voltage source Power for the instrument and the test circuit is obtained from internal rechargeable NiCd cells When the battery needs recharging a red L E D low battery voltage warning light illuminates next to the display An integral charger unit is fitted accompanied by a warning neon light to Show when the battery is under charge and a fuse for protection Note It is advisable to ensure that the battery cells are fully charged before embarking upon any tests The instrument is contained in a robust plastic case with a hinged detachable lid that will automatically become unclipped if it is accidentally thrown or dropped open thus preventing damage to the hinges A variety of test lead sets some with duplex handspikes are available as optional extras Applications The BT51 is designed to measure the resistance of the bonding Power cord of metalwork on large frames and structures earth bonds cable bonds lightning conductors etc and to check bus bar continuity It is also able to measure the resistance of the bonding of metalwork on aircraft It has a resolution of 0 01 mQ and is able to check the resistance between metal points on the aircraft structure Symbols used on the Instrument Caution refer to accompanying documents CE Equipment complies with current EU Directives If the power cord plug is not suitable for your type of sock
15. es with 2 5 m 8 ft test leads Part No 6111 022 User Guide Part No 6170 921 ACCESSORIES Supplied at extra cost Duplex handspikes with 6 1 m 20 ft test leads Part No 6111 023 Duplex handspikes with 9 1 m 30 ft test leads Part No 6111 024 Pair of single handspikes with 1 8m 6 ft test leads Part No 6130 516 Four terminal lead set with clip connectors Part No 6110 220 Accessory pouch leather Part No 6430 193 15 Repair and Warranty M MMM M M M 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 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 Center Dover 2621 Van Buren Avenue Kent CT17
16. esistance piece of metal with the potential spikes as close as possible to each other zero reading should be obtained on the digital L E D display Note Current will only pass when the circuit is completed between the C1 and C2 spikes The green L E D light will illuminate to indicate when this occurs Make sure also that the low battery warning light does not illuminate Press the handspike sets down on to the equipment or conductor to be tested The handspikes may be as far apart as the lead length will allow 5 Read the resistance measured from the digital display 6 Ifthe over range symbol appears on the display when the 20 mQ range is in use i e al as the left hand digit with the remaining L E D s blank turn the selector switch to the 2000 m range and repeat the test If the over range symbol i e a l as the left hand digit appears again the resistance being measured is outside the range of the instrument 7 Aftertesting remove the handspikes turn the selector switch to Off and disconnect the test leads Caution When the instrument is used for measuring an inductive load a voltage spike will appear across the terminals This occurs when the instrument is switched between ranges or the test leads are connected or disconnected The instrument will withstand voltage spikes caused when measuring inductive loads which include the test leads of up to 250 mH USING ALTERNATIVE LEADS
17. et outlets receptacles do not use an adaptor You should use a suitable alternative power cord or if necessary change the plug by cutting the cord and fitting a suitable plug The colour code of the cord is Earth Ground Yellow Green Neutral Blue Phase Line Brown If using a fused plug a 3 Amp fuse to BS 1362 should be fitted Note plug severed from the power cord should be destroyed as a plug with bare conductors is hazardous in a live socket outlet receptacle Specification Ranges Test current Accuracy 0 C to 50 C Display Temperature Range Protection 240 V model 115 V model Power Supply Safety E M C Dimensions Weight Cleaning 2000 MQ resolution 1 20 000 mQ resolution 0 01 2 A to 2 5 at any reading 1 2 digits 3 digit L E D Operating C to 50 C Storage 20 Cto450 C Relay protection for up to 240 V a c power source applied 100 mA T fuse 20 mm x 5 mm ceramic For charging circuit 250 mA T fuse 20 mm x 5 mm ceramic For charging circuit Internal 4 Ah NiCd rechargeable cells and charging unit Normal charging time at 240 V is 10 hours The instruments meet the requirements for double insulation to IEC 1010 1 1995 EN 61010 1995 In accordance with IEC 61326 including amendment No 1 344 mm 13 ins x 245 mm 9 ins x 158 mm 6 ins 4 5 kg 10 Ib Wipe disconnected instrument with a clean cloth dampened with soapy water or Isopropyl A
18. gement des batteries 4 Enfin de charge couper l alimentation secteur d brancher le cordon du chargeur et remettre le couvercle cache prise en place 11 Kurzanweisungen ACHTUNG Vor Anschlu des Ger ts ist sicherzustellen da die zu pr fenden Anlagen bzw verkabelungen abgeschaltet sind ABNEHMEN DES DECKELS Falls notwendig kann der Deckel entfernt werden indem er einfach unter Festhalten des Ger tek rpers durch Druck auf die Offnungskante nach unten gedr ckt wird Die Scharniere schnappen dann aus Zum Wiedereinsetzen des Deckels ist er vertikal zu halten damit die Scharniere wieder in ihre Klammern ein schnappen w hrend das Ger t festgehalten wird Der Deckel kann wieder geschlossen werden DURCHFUHREN EINER MESSUNG unter Verwendung von doppelten Handspitzen Die Pr fleitungen an die MEB gerataklemmen anschlie en Stromleitungen an C1 und C2 Spannungsleitungen an P1 und P2 Anmerkung Die von Megger Limited geleiferten doppelten Handspitzengamituren sind mit schwarzen Stromleitungen und roten Spannungsleitungen versehen 2 Den Bereichumschalter auf die entsprechende Schalt Stellung setzen 3 Beide Handspitzengarnituren mit einem niederohmigen Metallst ck in Ber hrung bringen so daf die Spannungsspitzen so nahe wie m glich beieinanderliegen Dabei soll Null in der Digitalanzeige erscheinen Anmerkung Bei flie amp endem Pr fstrom zwischen den Klemmen C1 und C2 leuchtet die gr ne Signallampe
19. instrument passes between the current terminals C1 and C2 via the test sample The voltage across the test sample is measured across the potential terminals P1 and P2 he test current of nominally 2A is measured by monitoring the voltage drop across an internal series resistor The instrument compares this voltage with the voltage across the P1 and P2 terminals and a ratiometric measurement is performed On the lower range a voltage amplifier is used Because the measurement is ratiometric the reading is unaffected by minor variations of test current There are two measuring ranges 2000 mQ and 20 mQ selected by the rotary switch that is also used to turn the instrument off The readings are indicated on a 31 2 digit light emitting diode display which is easily seen in poor lighting conditions A green L E D indicator light glows when the test current 15 passing between the C1 and C2 terminals as a test is made red neon light adjacent to the terminals illuminates as a warning of the presence of a dangerous voltage should the test lead probes be accidentally placed across a live circuit The instrument incorporates a relay protection circuit effective up to 240 V a c should such a connection occur This protection becomes operative at low voltages and the neon warning light shows when a dangerous voltage is present Both the neon warning light and the protective relay are effective irrespective of whether or not the instrum
20. iones Resumidas de Uso ADVERTENCIA Verificar que el aparato o conductor a comprobar est sin tensi n antes de conectar el instrumento DESMONTAJE DE LA TAPA Se puede retirar la tapa del mili hmetro en r gimen de servicio cuando sea necesario para lo cual basta abrirla hasta el m ximo y ejercer leve presi n sobre el borde de apertura mientras que se sujeta firmemente la caja del instrumento con ello se soltar n los pasadores de bisagra Para reinstalar la tapa colocarla en posici n vertical e introducir los pasadores en sus soportes mientras que se sujeta el instrumento cerrando la tapa despu s REALIZACION DE MEDIDAS supuesto el empleo de puntas duplex Conectar los conductores de prueba con los terminales del instrumento los de corriente con C1 y C2 los de potencial con P1 y P2 Nota Los juegos de puntas duplex suministrados por Megger Limited tienen conductores de corriente negros y conductores de potencial rojos 2 Situar el selector de escala en la posici n apropiada 3 Tocar con ambos juegos de puntas una pieza de metal de baja resistencia de modo que las puntas de potencial est n lo m s cerca posible una de otra El display debe indicar cero Nota Cuando la corriente de prueba pase entre los terminales C1 y C2 se encender a luz indicadora de color verde 4 Tocar y apretar hacia abajo con las puntas sobre el aparato conductor objeto de comprobaci n Observar la medida de resistencia en el
21. lcohol IPA Operation WARNING Ensure that the equipment or conductor to be tested is de energised before connecting the instrument THE DETACHABLE LID The lid hinges are fitted with spring loaded clips and are designed in this way for two reasons Firstly if the lid is accidentally thrown open to its full extent the hinges will not be strained or broken but the lid will be safely unclipped secondly the lid can purposely be removed if required when the instrument is in use by simply opening it up to its full extent and gently pressing down on the opening edge while holding the tester body firm The hinges will then unclip To replace the lid hold it vertically and push the hinges back into their clips again while restraining the instrument then fold the lid shut PERFORMING A TEST assuming duplex handspikes are used 1 Connectthe test leads to the instrument terminals current leads to C1 and C2 potential leads to P1 and P2 Note Duplex handspikes provided by Megger Limited are identified as follows The current lead is black and the spade connector is stamped with a C the potential lead is red and the spade connector is stamped with a P On the handspikes themselves the potential spike is marked with a P 2 the range selector switch to the appropriate position If it is desired check that the instrument is functioning correctly by touching the two handspikes onto a known low r
22. nation defines the current limiting value A L E D L2 and resistor R20 are connected across the current limiting circuit such that with no voltage drop across that circuit i e with the C terminals open circuit and no test current flowing the L E D is off When test current flows a voltage drop exists across the current limit circuit and the L E D will be illuminated PROTECTION CIRCUIT The relay cannot be energised with the instrument turned off therefore the terminals are isolated from the circuitry although neon light N2 will still indicate if high voltage is applied between the terminal pairs C1 P1 and C2 P2 With the instrument switched on and the terminals open circuit TR1 is made to conduct via R4 R9 and and the voltage on C1 is held low Current flows in the base of TRA keeping TR3 non conducting and the relay in the safe condition The application of a short circuit or the unknown resistance across the terminals causes TR1 to stop conducting C 1 charges to almost battery voltage level and TRA stops conducting This causes to turn the relay on and TRE maintains this situation until the unknown resistance is removed TR2 operates as TR1 for reverse polarity voltages and together they protect the circuit against a c voltages Open circuits or voltages across the terminals maintaining TRT or TR2 conducing keeps the relay off and the circuit protected AMPLIFIER The 2000 mQ range does not require an
23. obald der Stromkreis zwischen C1 und C2 geschlossen ist flie t Pr fstrom angezeigt durch die gr ne Signallampe es sei denn der Umschalter ist in der Aus Stellung im Interesse einer langen Batteriestandzeit sind die Me zeiten so kurz wie m glich zu halten AUFLADEN DER BATTERIE Sobald die Signallampe f r zu niedrige Batteriespannung aufleuchtet mu die Batterie aufgeladen werden 1 Zur Freigabe der Ladebuchse die Abdeckung umschwenken 2 Einen geeigneten Stecker an die Netzleitung des Ladeger ts anschlie en Dabei sicherstellen da die Erdader in der Netzleitung vorschriftsm ig angeschlossen ist damit das Ger t bei Laden der Batterie geerdet ist 3 Die Lertung in das Ger t einstecken dann in eine geeignete Netz Steckdose und einschalten 4 DieBatterie min 10 Stunden aufladen Das Instrument kann auch w hrend des Ladens f r Pr fungen eingesetzt werden sofern die Batterie nicht ganz ersch pft ist bzw einen Teil ihrer Spannung in einer kurzen Ladungsphase zur ckgewinnen konnte Die Netzversorgung der Lade einheit kann den Teststromerfordernissen nicht ohne Batterie gerecht werden Auch treten bei Netzst rungen bedingte Me probleme auf Erfolgt Laden der Batterie und Messung gleichzeitig mu eine l ngere Ladezeit vorgesehen werden Die Batterie nimmt dadurch keinen Schaden 5 Nach dem Aufladen das Netz abschalten die Ladeleitung entfernen und die Ladebuchse wieder mit dem Deckel verschlie en Instrucc
24. spannung luz de aviso de bajo voltaje bateria terminals bornes anschlu klemmen terminales dangerous voltage warning light voyant avertisseur de presence de tension dangereuse signallampe f r uberspannung luz de aviso de voltaje peligroso indicating light for test current flowing voyant indiquant un d bit de courant d essal signallampe f r flief Senden pr fstrom luz indicadora de circulaci n de corriente de prueba digital display affichage num rique digitalanzeige display digital Mode D Emploi RECOMMANDATION 5 assurer que l quipement ou le conducteur essayer se trouve hors tension avant d y relier l appareil DEPOSE DU COUVERCLE 5i n cessaire le couvercle peut tre d pos pendant l utilisation de l appareil ll suffit d ouvrir celui ci compl tement et d appliquer une pression sur son bord d ouverture tout en maintenant fermement le boitier de l appareil les charni res se s parent alors Pour remettre le couvercle en place le pr senter verticalement et enfoncer les charni res dans leurs dispositifs de retenue tout en maintenant l appareil puis fermer le boitier Be en D UN ESSAI avec pointes de touche doubles Brancher les cordons d essai sur les bornes de l appareil les cordons d intensit sur C1 et C2 les cordons de tension sur P1 et P2 Les jeux de pointes de touche livr s par le constructeur sont quip s de cordons noirs pour le circuit courant et rouges pour le
25. uring charging providing the battery is not completely exhausted and has been allowed a little time to recoverits voltage The mains supply cannot fulfil the test current requirements without the aid of the battery In these circumstances problems in measurement may arise due to mains interference A longer charging time must be allowed if battery charging and testing are carried out simultaneously The battery will not be damaged by a longer charging period 5 After charging switch off the mains power supply remove the charging lead and replace the battery charger socket cover Outline Diagram detachable hinges charni res s parables l sbare scharniere battery charging bisagras neon light voyant de charge batteries batterieladelampe luz indicadora de caga bateria N Secteur C1 netzsicherung fusible de alimentaci n de LN red I Y m Off battery charger Socket cover cache prise chargeur de batteries abdeckung der batterie ladebuchse tapa de toma para cargador bateria 4 2000m N hinged lid couvercle mont sur charni res schwenkbarer decke tapa abisagrada mains supply fuse _ MS fusible alimentation i P2 C2 E e BT51 IC IL MAS low battery voltage warning light voyant avertisseur d charge batteries range selector switch s lecteur de gamme bereichsumschalter selectror de escalas 10 signallampe f r zuniedrige batterie

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