Biddle LT7_UG 电路图.pdf

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1、Digital Loop Tester MEGGERLT7 User Guide Guide de lutilisateur Gebrauchsanleitung Gua del usuario NOTE THE INSTRUMENT MUST ONLY BE USED BY SUITABLY TRAINED AND COMPETENT PERSONS. Symbols used on the instrument Caution: refer to accompanying notes. Equipment protected throughout by Double Insulation

2、(Class II) Equipment complies with relevant EU Directives SAFETY WARNINGS Safety warnings and precautions must be read and understood before the instrument is used. They must be observed during use. Continuity of protective conductors and earthed equipotential bonding of new or modified installation

3、s must be verified before carrying out an earth fault loop impedance test. Exposed metalwork of an installation or equipment under test must not be touched. LT7 must not be connected across two phases of a 3 phase supply. The LCD neon voltage indicators cannot reveal a Neutral - Earth reversal. Loop

4、 impedance 50 V when performing a 3 wire test (L-PE and N - PE neonsactivated). 3)Electrical noiseexceeds rejection level on low current range. (displayed). 4)Voltage is out of range. Flashing VOL and actual Voltage displayed. 5)Supply frequency out of limits (flashing HZ displayed). 6 )Thermal prot

5、ection device operates on h i g h current range ( and d i s p l a y e d ) . Low Current (Auto) measurement (0,1 or 1 resolution) This mode measures Live to Earth loop impedance via installation sockets. Live to Earth or Live to Neutral loop impedance can also be measured using the optional dual lead

6、 test set. The measurement sequence takes 11 seconds. Residual Current Devices (R.C.D.s) 30mA will not trip. LT7 is supplied as standard with a display resolution of 0,1 . In areas of exceptional electrical noise, and where improved repeatability may be desired, it is possible to change the display

7、resolution to 1 in the following manner:- 1)Turn rotary switch to the OFF position. 2)Press and hold the Retest push button whilst turning the rotary selector switch to any other position. 3)Still holding the Retest button, the display will cycle between 1 and 0,1 resolution. 4)Release the Retest bu

8、tton when the desired resolution is displayed. To operate LT7:- 1) Turn rotary switch to Auto. 2)Connect LT7 by mains cord, or using the dual test lead firmly connect red test probe to Live and the black test probe to Neutral or to Protective Earth (ground). Mains (line) voltage is displayed. 3)Test

9、 progress is indicated by a sequential display of vertical bars. Refer to Safety Warnings before using the instrument RadioFans.CN 收音机爱 好者资料库 4)Loop impedance value is displayed directly in . (2 kdisplayed if resistance exceeds 2 k). High Current (20 ) measurement (0,01 resolution) This mode measure

10、s L i v e t o E a r t h loop impedance via installation sockets o r t h e L i v et oE a r t h or the L i v et oN e u t r a l loop impedance using the optional dual lead test set. N o t e: This mode may cause RCDs to trip. The measurement sequence takes 5 seconds. 1 )Turn rotary switch to 2 0 . 2 )Co

11、nnect LT7 by mains cord, or using the dual test lead firmly connect red test probe to Live and the black test probe to Neutral or to Protective Earth (ground). Mains (line) voltage is displayed. 3 )Test progress is indicated by a sequential display of vertical bars. 4 )Loop impedance value is displa

12、yed directly in . N o t e : Any measurement 20 displayed if resistance exceeds 20). High Current (PSCC) m e a s u r e m e n t In this mode, LT7 displays the Prospective Short Circuit Current (calculated at the nominal supply voltage of 230V divided by loop impedance). This mode can be used for L i v

13、 e to Earthconnection via unprotected installation sockets, o r for Live toE a r t h , o r L i v e to Neutral connection on unprotected circuits using the optional lead set. T h i s mode may cause RCDs to trip. The measurement sequence takes 5 seconds. 1)Turn rotary switch to PSCC. 2)Plug in the LT7

14、, or firmly connect red test probe to Live and black test probe to Protective Earth (ground) or to Neutral. Mains (line) voltage is displayed. 3)Test progress is indicated by a sequential display of vertical bars. 4)PSCC value displayed directly in kA. (20kA displayed if value exceeds 19,9kA). Earth

15、 Bond Testing By using the earth bond test lead available as an optional extra, the LT7 can measure the quality of Equipotential bonding within an installation. 1) Turn rotary switch to Auto or 20 . 2) Firmly connect the flying lead probe to the metalwork to be tested and plug the LT7 into a conveni

16、ent installation socket. 3)Reading displayed will consist of socket supply (live conductor) impedance plus the impedance of the equipotential earth bonding. SPECIFICATION Ranges: 20 (23Anominal)0,01 - 19,9 2% 3 digits (230 V supply) 5% 6 digits (110 V supply) 200 /2k (15mAnominal) 1 -1,99k 2% 1 digi

17、t (230 V supply) 5% 2 digits (110 V supply) When set to 0,1 resolution2% 3 digits (230 V supply) (3 digits at 1 typical) PSCC (23Anominal)0,01 - 0,99 kA 1,0 - 19,9 kA Note: Calibration includes the test leads and plug. To maintain accuracy, these must not be changed. See note overleaf. Nominal Syste

18、m Voltage:110 V / 230 V at 50 Hz Voltage Accuracy:2% 2 digits (when L-PE neon indicates). Power supply:4 x 1,5 V Alkaline cells IEC LR6 type or 4 x 1,2 V NiCd or NiMHrechargeable cells Auto shut off:After 5 minutes of instrument inactivity Battery life: Typically 1200, one minute tests Low Battery I

19、ndicator:The symbol will appear when Alkaline battery cells are almost e x h a u s t e d . Note: Battery cells should not be left in an instrument which may remain unused for extended periods of time. Display:3 digit L.C.D. Temperature Range: Operating:-5C to 40C (0 - 90% RH non Condensing) Storage:

20、-25C to 65C (0 - 95% RH non Condensing at 4 0 C ) Thermal Protection:Thermal cut-out will prevent overheating caused by repetitive testing on highcurrent range. Safety: Meets the requirements for double insulation to IEC1010-1(1995) EN61010 (1995) at 230 V installation Category III*, without the nee

21、d for separately fused test leads. If required, fused test leads are available as an optional accessory. *Relates to transient overvoltage likely to be found in fixed installation wiring. Fuses:- Internal 10A (F) 440 V 10kA ceramic HBC - Mains power cord fused plug (when applicable): 10 Amp fuse to

22、BS1362 E.M.C:In accordance with IEC 61326 including amendment No.1 Note:Overvoltage spikes may cause a reset to the original power On state before reverting to normal operation. Environmental Protection:IP54 Dimensions:220 mm x 92 mm x 55 mm Weight:1200g (including leads, case & battery cells) Clean

23、ing:Wipe disconnected instrument with a clean cloth dampened with soapy water or Isopropyl Alcohol (IPA). ACCESSORIES SuppliedPart number User Guide6172-087 Power cord test lead with 3 pin plug to BS1363/A6231-601 or Power cord test lead with CEE 7/7 plug6231-593 Dual test lead with probe6231-591 Te

24、st-&-carry case 6420-092 Optional Test Lead Set red/balck6220-437 Crocodile clip, black, for use with dual test lead6280-284 Earth bond test lead with probe and 3 pin plug 6231-586 to BS1363/A Fused probe and clip set (2 probes and 3 clips) 1000 V max.10A fuse6180-405 Power cord The power cord suppl

25、ied with your LT7 forms part of the measuring circuit of the instrument. The overall length of this lead must not be altered. If the power cord plug is not suitable for your type of socket outlets, do not use an adaptor. You may change the plug once only by cutting the cord as close as possible and

26、fitting a suitable plug. The colour code of the cord is: Earth (Ground)Yellow / Green N e u t r a lB l u e Phase (Line)B r o w n If using a fused plug, a 10 Amp fuse to BS 1362 should be fitted. Note: Aplug severed from the power cord should be destroyed, as a plug with bare conductors is hazardous

27、in a live socket outlet. 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 pe

28、rsonnel. 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 f

29、or 3 Years from the Date of Purchase by the User. Note:Any unauthorized prior repair or adjustment will automatically invalidate the Wa r r a n t y. Instrument Repair and Spare Parts For service requirements for Megger Instruments contact :- Megger LimitedorMegger Inc. Archcliffe Road Valley Forge C

30、orporate Center Dover 2 621 Van Buren Avenue Kent, CT17 9ENNorristown, PA 19403 EnglandU.S.A. Tel: +44 (0) 1304 502243Tel: +1 (610) 676-8579 Fax: +44 (0) 1304 207342 Fax: +1 (610) 676-8625 or an approved repair company. Returning an Instrument for Repair If returning an instrument to the manufacture

31、r for repair, it should be sent freight pre-paid to the appropriate address. Acopy 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 req

32、uired, before work on the instrument commences. Megger Limited Archcliffe Road Dover Kent CT17 9ENTel: +44 (0) 1304 502100 EnglandFax: +44 (0) 1304 207342 4271 Bronze Way DallasTel: +1 (800) 723-2861 (U.S.A. only) TX 75237-1017Tel: +1 (214) 330-3203 (International) U.S.A.Fax: +1 (214) 337-3038 POBox

33、 9007 Valley Forge PA19484-9007Tel: +1 (610) 676-8500 U.S.A.Fax: +1 (610) 676-8610 Megger SARL 29 Alle de Villemomble 93340 Le Raincy ParisTel: +33 (1) 43.02.37.54 FranceFax: +33 (1) 43.02.16.24 This instrument is manufactured in the United Kingdom The company reserves the right to change the specif

34、ication or design without prior notice Megger is a registered trademark Part No. 6172-087 - Edition 9 - Printed in England - 09HH Guide de lutilisateur Remplacement des piles Pour des raisons de scurit, le compartiment des piles ne doit pas tre ouvert si le(s ) cble(s ) est(sont) branchs. Dfaire les

35、 deux vis la base de linstrument pour accder au compartiment des piles et remplacer les piles. L i n s t r u m e n t mettra un bipsonore. Sassurer que la bonne polarit est respecte et que le cache est bien remis en place. FONCTIONMENT Mesures - Gnralits La mesure de limpdance de la boucle Phase - Te

36、 r r e peut se faire travers une prise de linstallation en utilisant le cble de test prise, ou bien en tout autre point pratique sur linstallation en utilisant le cble de test capteurs en option. Le cble de test capteurs en option peut aussi tre utilis pour effectuer la mesure de limpdance de la bou

37、cle Phase - Neutre. Mise en Marcheet test Linstrument sera activ en tournant linterrupteur rotatif. Linstrument peut aussi tre ractiv en appuyant sur le bouton R e t e s t aprs son Arrt A u t o m a t i q u e . Linstrument affichera momentanment tous les segments de lcran, suivi du numro de version d

38、u logiciel. Lorsque connect la tension du secteur de la b o n n e p o l a r i t , lindicateur au non L - P E ( P h a s e - Terre) est activ et la tension dalimentation est affiche. Le mot n u l l est ensuite affich et un contrle de calibrage automatique de 11 secondes (Gamme A u t o uniquement) est

39、eff e c t u . Linstrument continue ensuite relever automatiquement une mesure. Les cbles de test termins par une prise deux fiches doivent tre inverss u n i q u e m e n t s i lindicateur de tension N - P E ( N e u t r e - Terre) est activ. Des mesures rptes peuvent tre effectues soit en dconnectant

40、puis en reconnectant linstrument (par exemple lors de lutilisation de sondes de test), soit en appuyant sur le bouton R e t e s t . Lorsquil fonctionne, le LT 7 e ffectuera un calibrage automatique toutes les AVERTISSEMENTS DE SECURITE La continuit des conducteurs de protectionet la mise la terre qu

41、ipotentielle des installations nouvelles ou modifies doit etre vrifie avant deffectuer un test dimpdance de boucle de terreaccidentelle. Les parties mtalliques exposes dune installation ou dun quipement en cours de test ne doivent pas tre touches. Linstrument ne doit pas tre connect entre deux phase

42、s dune alimentation triphase. Laffichage cristaux liquides de la tension ne peut pas afficher un inversement Neutre - Terre. Les cbles, sondes et pinces crocodiles de test doivent tre en bon tat, propres et sans isolation casse ou fissure. Eviter de tirer des arcs excessifs lors des tests courant le

43、v. Le cble dalimentation du secteur fait partie du circuit de mesure de linstrument. Ce cble de test ne doit pas tre modifi ou chang de quelque faon que ce soit, ou tre utilis pour un autre instrument lectrique. Linstrument ne doit pas tre utilis si une partie est endommage. Lutilisation de linstrum

44、ent de faon non spcifie peut affecter la protection fournie. ,Les avertissements de securite et les precautions doivent etre lueset compris avant dutiliser linstrument. Ils doivent etre observesdurant lutilisation. REMARQUE LINSTRUMENTNE DOITETRE UTILISE QUE PAR DES PERSONNESCOMPETENTES ET FORMEES V

45、oir les Avertissement de Scurit avant dutiliser linstrument. 5 minutes. Indication de condition du circuit Le test est bloqu si: 1 )Les connexions dalimentation de Phase et Neutre sont inverses (Non N - P E a c t i v ) . 2 )La tension Neutre - Terre 50V lors de lexcution dun test 3 fils ( N o n s L

46、- P E et N - P E a c t i v s ) . 3 )Le bruitlectrique dpasse le niveau de rejet pour la gamme courant bas. ( aff i c h ) . 4 )La frquence dalimentation est hors limites (H zclignotant est aff i c h ) . 5 )Le dispositif de protection thermique fonctionne pour la gamme de courant haut ( aff i c h ) .

47、Mesure (automatique) de courant faible (rsolution 1 ) Ce mode mesure limpdance de la boucle P h a s e Te r r e au moyen de prises dinstallation, sans faire disjoncter les Interrupteurs de Protection contre les Courants de Court-circuit 30mA( I . P.C.C.). Limpdance de la boucle P h a s e Te r r e ou

48、P h a s e N e u t r e peut aussi tre mesure en utilisant lensemble de test avec cbles en option. La squence de mesure prend environ 11 secondes. 1 )Mettre linterrupteur rotatif sur A u t o . 2 )Brancher le LT 7 ou connecter fermement le capteur de test rouge sur P h a s e et le capteur de test noir

49、sur N e u t r e ou sur Terre de Protection (terre). La tension du secteur est aff i c h e . 3 )La progression du test est indique par un affichage squentiel de barres verticales. 4 )La valeur de limpdance de la boucle est affiche directement en . Mesure de courant lev (20 ) (rsolution 0,01 ) Ce mode mesure limpdance de la boucle P h a s e Te r r e au moyen de prises dinstallation ou limpdance de la boucle P h a s e Te r r e ou P h a s e N e u t r e e n utilisant lensemble de test avec cbles en option. La squence de mesure prend environ