WT310/WT310HC/WT332/WT333 Digital Power Meter

Transcription

1 WT31/WT31HC/WT332/WT333 Dgal Power Meer User s Manal IM WT31-1N 2nd don

2 Thank yo for prchasng he WT31, WT31HC, WT332, or WT333 Dgal Power Meer (herenafer, WT3 seres wll refer o all of hese prodcs). The WT3 seres s a power measremen nsrmen ha can measre parameers sch as volage, crren, and power. Ths User s Manal explans he feares of he WT3 seres and how o se hem. To ensre correc se, please read hs manal horoghly before begnnng operaon. Keep hs manal n a safe place for qck reference n he even ha a qeson arses. Ths manal s one of hree WT3 seres manals. Please read all manals. Manal Tle Manal No. Descrpon WT31/WT31HC/WT332/WT333 Dgal Power Meer User s Manal WT31/WT31HC/WT332/WT333 Dgal Power Meer Geng Sared Gde WT31/WT31HC/WT332/WT333 Dgal Power Meer Commncaon Inerface User s Manal IM WT31-1N IM WT31-2N IM WT31-17N PD fles of all he manals above are nclded n he accompanyng CD. Ths manal. The manal explans all he WT3 seres feares, excep for he commncaon nerface feares, and how o se hem. Provded as a prned manal. Ths manal explans he handlng precaons and basc operaons of he WT3 seres and provdes an overvew of s feares. Ths manal explans he WT3 seres commncaon nerface feares and how o se hem. Noes The conens of hs manal are sbjec o change who pror noce as a resl of connng mprovemens o he nsrmen s performance and fnconaly. The fgres gven n hs manal may dffer from hose ha acally appear on yor screen. very effor has been made n he preparaon of hs manal o ensre he accracy of s conens. However, shold yo have any qesons or fnd any errors, please conac yor neares YOKOGAWA dealer. Copyng or reprodcng all or any par of he conens of hs manal who he permsson of YOKOGAWA s srcly prohbed. Safey precaons are provded n he Geng Sared Gde, IM WT31-2N. Be sre o observe he safey precaons. The TCP/IP sofware of hs prodc and he docmens concernng have been developed/creaed by YOKOGAWA based on he BSD Neworkng Sofware, Release 1 ha has been lcensed from he Regens of he Unversy of Calforna. Trademarks Mcrosof, Inerne xplorer, MS-DOS, Wndows, Wndows NT, Wndows XP, Wndows Vsa, and Wndows 7 are eher regsered rademarks or rademarks of Mcrosof Corporaon n he Uned Saes and/or oher conres. Adobe and Acroba are eher regsered rademarks or rademarks of Adobe Sysems Incorporaed. In hs manal, he TM and symbols do no accompany her respecve regsered rademark or rademark names. Oher company and prodc names are regsered rademarks or rademarks of her respecve holders. Revsons Janary 213 Jne 213 1s don 2nd don 2nd don: Jne 213 (YMI) All Rghs Reserved, Copyrgh 213 Yokogawa Meers & Insrmens Corporaon IM WT31-1N

3 Convenons Used n Ths Manal Uns k: Denoes 1. xample: 1 ks/s (sample rae) K: Denoes 124. xample: 72 KB (fle sze) Noes The noes and caons n hs manal are caegorzed sng he followng symbols. Improper handlng or se can lead o njry o he ser or damage o he nsrmen. Ths symbol appears on he nsrmen o ndcae ha he ser ms refer o he ser s manal for specal nsrcons. The same symbol appears n he correspondng place n he ser s manal o denfy hose nsrcons. In he ser s manal, he symbol s sed n conjncon wh he word WARNING or CAUTION. WARNING CAUTION Noe Calls aenon o acons or condons ha cold case seros or faal njry o he ser, and precaons ha can be aken o preven sch occrrences. Calls aenon o acons or condons ha cold case lgh njry o he ser or case damage o he nsrmen or ser s daa, and precaons ha can be aken o preven sch occrrences. Calls aenon o nformaon ha s mporan for he proper operaon of he sofware. Characers Tha Appear on he 7-Segmen LD Becase hs nsrmen ses a 7-segmen LD dsplay, nmbers, leers, and mahemacal symbols are dsplayed sng specal characers n he manner shown below. Some of he characers shown below are no sed by hs nsrmen A B C D G H I J Lowercase c Lowercase h K L M N O P Q R S T U V W X Y Z + - ^ (exponenaon) IM WT31-1N

4 Convenons Used n Ths Manal Symbols and Convenons Used n Procedral xplanaons The conens of he procedral explanaons are ndcaed sng he followng symbols. Ths mark appears on he rgh sde of he page o ndcae feares and sengs ha can be operaed and confgred sng he WTVewerreePls applcaon sofware, whch comes wh he nsrmen. Procedre Operaons are explaned sng flowchars. See he example below for an explanaon of how varos operaons are ndcaed. All procedres are wren nder he assmpon ha yo are sarng operaon a he begnnng of he procedre, so yo may no need o carry o all he seps n a procedre when yo are changng he sengs. xample: Operaons for rnng he sorage feare on and off 1. Confgre he sorage feare. (Dsplay B) (Dsplay C) Confrm he seng. Close men. The above flow char ndcaes he followng operaons. Yo can confgre ems ha are blnkng. 1. Press he SHIT key so ha llmnaes, and hen press STUP (UTILITY). A men appears n dsplay B. 2. Use or o selec Sor. Pressng eher key cycles hrogh 9 men ems. 3. Press ST o confrm he selecon of Sor. The Sor fncon men ha yo seleced n sep 2 appears n dsplay C. 4. Use or o selec o or on. Pressng eher key cycles hrogh 3 men ems. 5. Press ST o confrm he selecon of o. The seleced or se em s confrmed when yo press ST. A men appears n dsplay B. 6. Press HOLD (SC) o rern he men dsplay o he measred daa dsplay. When yo are makng a nmber posve (no sgn) or negave ( ) or seng a nmber, when he dg n he dsplay ha he np wll be added o s blank, an nderscore flashes a he poson of he dg. Whle yo are performng men operaons, o leave he men dsplay, press HOLD (SC). All seng changes ha yo have confrmed by pressng he ST key wll be refleced n he sengs. xplanaon Ths secon descrbes he sep ems and he lmaons regardng he procedres. I may no gve a dealed explanaon of he feare. or a dealed explanaon of he feare, see chaper 1. IM WT31-1N

5 nerng Vales Selecng a Vale The dg ha s blnkng s he one ha s crrenly beng se. Use or o selec a nmber. Movng he Dg Tha Is Beng Se Press SHIT+ ( ) o move he dg ha s beng se o he rgh. If yo press SHIT+ ( ) when he dg ha s beng se s he dg ha s frhes o he rgh, he dg ha s beng se wll swch o he lefmos dg ha can be se. Movng he Decmal Pon Press SHIT+ (.) o move he decmal pon o he rgh. If yo press SHIT+ (.) when he decmal pon s as far o he rgh as can be, he decmal pon wll move o he lefmos possble poson. Increases he nmber Redces he nmber + Moves he decmal pon o he rgh + Moves he dg ha s beng se o he rgh v IM WT31-1N

6 Conens 1 Convenons Used n Ths Manal... nerng Vales...v 2 Chaper 1 Chaper 2 Chaper 3 Chaper 4 Chaper 5 eares 1.1 Iems Tha Ths Insrmen Can Measre (Measremen fncons) Measremen Condons Holdng Measred Vales and Performng Sngle Measremens Measrng Power Inegraed Power (Wa hor) Harmonc Measremen (Opon) Sorng Measred Daa and Savng and Loadng Sep Parameers Commncaon ncons Oher eares Measremen Condons 2.1 Seng he Measremen Mode Confgrng he Wrng Sysem Sengs (WT332/WT333 only) Seng he Measremen Range When Usng Drec Inp Seng he Measremen Ranges When Usng an xernal Crren Sensor (Opon) Seng he Scalng eare When Usng a VT or CT Confgrng Measremen Range Skppng Seng he Cres acor Seng he Measremen Perod Confgrng he Inp lers Seng he Daa Updae Inerval Seng Averagng Holdng Measred Vales and Performng Sngle Measremens 3.1 Holdng Measred Vales Performng Sngle Measremens Measrng Power 4.1 Dsplayng Volages, Crrens, and Acve Powers Dsplayng Apparen Powers, Reacve Powers, and Power acors Dsplayng Phase Angles and reqences Dsplayng Peak Vales Dsplayng he ffcency (WT332/WT333 only), Cres acors, he Resls of Compaons Usng Basc Arhmec, and Average Acve Powers Seng he MAX Hold eare Seng he Nmber of Dsplayed Dgs Inegraon 5.1 Inegraon eare Seng he Inegraon Mode and Tmer Dsplayng Inegraed Vales Noes abo Usng Inegraon App Index IM WT31-1N v

7 Conens Chaper 6 Chaper 7 Chaper 8 Harmonc Measremen (Opon) 6.1 Harmonc Measremen eare Dsplayng Harmonc Measremen Daa Seng he PLL Sorce, Measred Harmonc Order, and THD qaon Sorng Measred Daa and Savng and Loadng Sep Parameers 7.1 Sorng Measred Daa Savng and Loadng Sep Parameers Oher eares 8.1 Vewng Sysem Informaon Inalzng he Sengs Performng Zero-Level Compensaon Confgrng D/A Op Iems (Opon) nablng Key Proecon Carryng O Self-Tess (Selfes) Appendx Index Appendx 1 Appendx 2 Appendx 3 Appendx 4 Appendx 5 Appendx 6 Appendx 7 Symbols and Deermnaon of Measremen ncons...app-1 Power Bascs (Power, harmoncs, and AC RLC crcs)...app-6 Power Range...App-14 Seng he Measremen Perod...App-17 Measremen Accracy and Measremen rror...app-21 Men Transon Dagram...App-26 Block Dagram...App-34 v IM WT31-1N

8 Chaper 1 eares 1.1 Iems Tha Ths Insrmen Can Measre (Measremen fncons) The ems ha yo can measre wh hs nsrmen are lsed below. or deals abo how he vales of measremen fncons are deermned, see appendx 1. or explanaons of he erms measremen fncon, np elemen, wrng n, and Σ fncon, see Wha Is a Measremen ncon? (page 1-4). 1 eares WT31 and WT31HC The WT31 and WT31HC are only eqpped wh one np elemen. Becase of hs, hey can only measre sngle-phase measremen fncons. They canno measre comprehensve measremen fncons ha rea mlple np elemens as a sngle wrng n (Σ fncons). WT332/WT333 (WT33 seres) The WT332/WT333 s eqpped wh wo or hree np elemens. Becase of hs, he WT332/ WT333 can measre no only sngle-phase measremen fncons for each np elemen b also measre measremen fncons ha rea mlple phases as a sngle wrng n (Σ fncons). The measremen fncons ha yo can measre sng he WT3 seres are dvded no normal measremen and harmonc measremen and lsed n he followng able. Measremen ncons Used n Normal Measremen Volage Measremen ncon (Symbol) Panel Indcaor Descrpon Measred for Lgh 1 ach Inp lemen Measred for Wrng Uns (WT332/WT333 only) U (RMS) V Tre rms volage Yes Yes U (VOLTAG MAN) V Recfed mean volage calbraed Yes Yes o he rms vale U (DC) V Lnear volage average Yes Yes U+pk Vpk Maxmm volage Yes No U-pk Vpk Mnmm volage Yes No Cf U 2 MATH Volage cres facor Yes No Yes: Measred. No: No measred. 1 Panel ndcaors ndcae he n of he measred vale and he em ha s beng measred. They appear on he rgh or lef sde of he 7-segmen LD dsplay ha shows he measred daa. 2 Ths measremen fncon s se sng he MATH feare of he WT3 seres. Crren Measremen ncon (Symbol) Panel Indcaor Lgh Descrpon Measred for ach Inp lemen I (RMS) A Tre rms crren Yes Yes I (DC) A Lnear crren average Yes Yes I+pk Apk Maxmm crren Yes No I-pk Apk Mnmm crren Yes No Cf I * MATH Crren cres facor Yes No * Ths measremen fncon s se sng he MATH feare of he WT3 seres. Measred for Wrng Uns (WT332/WT333 only) IM WT31-1N 1-1

9 1.1 Iems Tha Ths Insrmen Can Measre Power Measremen ncon (Symbol) Panel Indcaor Lgh Descrpon Measred for ach Inp lemen P W Acve power Yes Yes S VA Apparen power Yes Yes Q var Reacve power Yes Yes λ P Power facor Yes Yes Φ Phase dfference Yes Yes P+pk Wpk Maxmm power Yes No P-pk Wpk Mnmm power Yes No reqency Measremen ncon (Symbol) Panel Indcaor Lgh Descrpon Measred for ach Inp lemen fu VHz Volage freqency Yes No fi AHz Crren freqency Yes No fpll (PLL U) VHz reqency of PLL volage * Yes No fpll (PLL I) AHz reqency of PLL crren * Yes No * Only on models wh he harmonc measremen opon Inegraed Power (Wa hor) Measremen ncon (Symbol) Panel Indcaor Lgh Descrpon Measred for ach Inp lemen Tme Tme Inegraon me Yes No WP Wh Sm of posve and negave wa Yes Yes hors WP± Wh± Posve or negave wa hors Yes Yes q Ah Sm of posve and negave Yes Yes ampere hors q± Ah± Posve or negave ampere hor Yes Yes AV P * MATH Average acve power drng negraon Yes Yes * Ths measremen fncon s se sng he MATH feare of he WT3 seres. ffcency (WT332/WT333 only) * Measremen ncon (Symbol) Panel Indcaor Lgh Descrpon MATH ffcency * Ths measremen fncon s se sng he MATH feare of he WT332/WT333. Basc Arhmec * Measremen ncon (Symbol) Panel Indcaor Lgh Descrpon A+B MATH A+B A-B MATH A-B A B MATH A B A B MATH A B A B^2 MATH A B 2 A^2 B MATH A 2 B * Ths measremen fncon s se sng he MATH feare of he WT3 seres. Measred for Wrng Uns (WT332/WT333 only) Measred for Wrng Uns (WT332/WT333 only) Measred for Wrng Uns (WT332/WT333 only) 1-2 IM WT31-1N

10 Measremen ncons Used n Harmonc Measremen (Opon) Harmonc measremen fncons are measred for each np elemen and only work wh snglephase measremen. They canno measre comprehensve measremen fncons ha rea mlple phases as a sngle wrng n (Σ fncons). Measremen ncon (Symbol) Panel Indcaor Lgh Descrpon U(k) V Rms volage vale of harmonc order k I(k) A Rms crren vale of harmonc order k P(k) W Acve power of harmonc order k λ(k) P Power facor of he fndamenal wave (1s harmonc) Φ(k) V or A 1.1 Iems Tha Ths Insrmen Can Measre Phase dfference beween he fndamenal volage and fndamenal crren when he harmonc order k s he 1s harmonc (fndamenal wave) Uhd V% Toal harmonc volage dsoron Ihd A% Toal harmonc crren dsoron Uhdf(k) V% Harmonc dsoron facor of volage for harmonc order k Ihdf(k) A% Harmonc dsoron facor of crren for harmonc order k Phdf(k) W% Harmonc dsoron facor of power for harmonc order k ΦU(k) V Phase dfference beween he volage of harmonc order k and and he fndamenal volage ΦI(k) A Phase dfference beween he crren of harmonc order k and he fndamenal crren k: The harmonc order, whch s ndcaed n dsplay A. 1 eares Harmonc Measremen ncon Orders The harmonc orders ha yo can specfy are ndcaed below. Measremen ncon (Symbol) Panel Indcaor Lgh Toal Vale (Toal rms vale) 1 (fndamenal wave) Harmoncs U(k) V Yes Yes 2 o 5* I(k) A Yes Yes 2 o 5* P(k) W Yes Yes 2 o 5* λ(k) P No Yes No Φ(k) V or No Yes No A Uhd THD V% Yes No No Ihd THD A% Yes No No Uhdf(k) V% No Yes 2 o 5* Ihdf(k) A% No Yes 2 o 5* Phdf(k) W% No Yes 2 o 5* ΦU(k) V No No 2 o 5* ΦI(k) A No No 2 o 5* k: The harmonc order * The maxmm measred harmonc order vares dependng on he freqency of he fndamenal wave. (See secon 7.4, Harmonc Measremen, n he Geng Sared Gde, IM WT31-2N.) IM WT31-1N 1-3

11 1.1 Iems Tha Ths Insrmen Can Measre Wha Is a Measremen ncon? Measremen ncon The physcal vales sch as rms volage, average crren, power, and phase dfference ha he WT3 seres measres and dsplays are called measremen fncons. ach measremen fncon s dsplayed sng a symbol ha corresponds o s physcal vale. or example, U corresponds o he volage. The n s V. When he measremen mode s RMS (see secon 1.2, Measremen Condons ), he re rms volage s dsplayed. WT31 and WT31HC Inp lemen An np elemen s a se of np ermnals ha a sngle phase of volage and crren ha yo wan o measre can be appled o. The WT31/WT31HC has one np elemen. Inp elemen Crren np Volage np Wrng Sysem The WT31/WT31HC ses a sngle-phase, wo-wre sysem. Wrng Uns and Σ ncons The WT31/WT31HC does no have mlple np elemens ha can be combned no wrng ns and Σ fncons. WT332/WT333 Inp lemens An np elemen s a se of np ermnals ha a sngle phase of volage and crren ha yo wan o measre can be appled o. The WT333 can be eqpped wh hree np elemens. The elemen nmbers range from 1 o 3. Wrng Sysems To measre he power of varos sngle-phase and hree phase power ransmsson sysems sng he WT332/WT333, no only can yo specfy a sngle-phase, wo-wre sysem, yo can also specfy a sngle-phase, hree-wre sysem; a hree-phase, hree-wre sysem; a hree-phase, for-wre sysem; or a hree-phase, hree-wre sysem ha ses he hree-volage, hree-crren mehod. Wrng Un A wrng n s a se of wo or hree np elemens ha are groped o measre hree-phase power. Wrng ns are represened by he Σ symbol. Σ ncons A measremen fncon of a wrng n s called a Σ fncon. or example, UΣ corresponds o he average of he volages of he np elemens ha are assgned o wrng n Σ. When he measremen mode s RMS, he re rms volage s dsplayed. Inp elemens Volage np Crren np Three-phase, for-wre Wrng sysem Σ Symbol ndcang he wrng n. 1-4 IM WT31-1N

12 1.2 Measremen Condons 1 Volage and Crren Measremen Modes (or procedres, see secon 2.1) Yo can selec one of he followng hree volage measremen modes: RMS, MAN (VOLTAG MAN), and DC. Yo can selec one of he followng wo crren measremen modes: RMS and DC. eares RMS (Tre RMS) The re volage or crren rms vale. 1 T T () 2 d f() : Inp sgnal T : One perod of he np sgnal MAN (VOLTAG MAN, recfed mean vale calbraed o he rms vale) One perod of he volage s recfed and he reslng average s mlpled by he facor ha wold yeld he re rms vale f he appled sgnal were a sne wave. When sne waves are measred, he vales obaned n hs mode are he same as hose obaned n RMS mode. The vales dffer from hose obaned n RMS mode when dsored waves or DC waves are measred. π T T () d f() : Inp sgnal T : One perod of he np sgnal DC (Lnear average) The average of one perod of he volage or crren. Ths mode s sefl for deermnng he average vale of a DC np sgnal or he vale of a DC sgnal ha s spermposed on an AC sgnal. 1 T T () d f() : Inp sgnal T : One perod of he np sgnal IM WT31-1N 1-5

13 1.2 Measremen Condons Wrng Sysems (or procedres, see secon 2.1) The wrng sysems ha yo can selec vary dependng on he model. WT31 and WT31HC The WT31 and WT31HC are only eqpped wh one np elemen. Yo can measre sngle-phase, wo-wre sysems. Becase here s only one np elemen, yo canno selec dfferen wrng sysems. WT332 (WT33 Two Inp lemen Model) The WT332 s eqpped wh wo np elemens (elemen 1 and elemen 3). On he WT332, yo can selec he followng wrng sysems. Wrng Sysem Descrpon lemens 1P3W Sngle-phase, hree-wre lemen 1 and elemen 3 3P3W Three-phase, hree-wre lemen 1 and elemen 3 The measred daa when a sngle-phase, wo-wre sysem (1P2W) has been specfed s he measred daa for elemens 1 and 3. The measred daa for a sngle-phase, wo-wre sysem wll be measred correcly regardless of whch of he above wrng sysems yo selec. WT333 (WT33 Three Inp lemen Model) The WT333 s eqpped wh hree np elemens (elemen 1, elemen 2, and elemen 3). On he WT333, yo can selec he followng wrng sysems. Wrng Sysem Descrpon lemens 1P3W Sngle-phase, hree-wre lemen 1 and elemen 3. lemen 2 s 1P2W. 3P3W Three-phase, hree-wre lemen 1 and elemen 3. lemen 2 s 1P2W. 3P4W Three-phase, for-wre lemens 1, 2, and 3 3V3A Three-volage, hreecrren mehod lemens 1, 2, and 3 The measred daa when a sngle-phase, wo-wre sysem (1P2W) has been specfed s he measred daa for elemens 1, 2, and 3. The measred daa for a sngle-phase, wo-wre sysem wll be measred correcly regardless of whch of he above wrng sysems yo selec. 1-6 IM WT31-1N

14 1.2 Measremen Condons Measremen Ranges (or procedres, see secon 2.3) Specfy he measremen ranges n accordance wh he rms vales of he volage and crren ha yo wan o measre. Yo can specfy fxed measremen ranges or have he ranges se aomacally. xed Ranges Yo can selec a range from varos opons. ven f he sze of he np sgnal changes, he seleced range wll no change. or volage, when he cres facor s se o 3, he maxmm range ha yo can selec s 6 V, and he mnmm range ha yo can selec s 15 V. When he cres facor s se o 6, he maxmm range ha yo can selec s 3 V, and he mnmm range ha yo can selec s 7.5 V. 1 eares Ao Range The WT3 seres aomacally swches he range accordng o he sze of he np sgnal. The ranges ha he WT3 seres swches beween are he same ranges ha yo can selec as fxed ranges. Range Increase The range s ncreased when any of he followng condons s me. Urms or Irms exceeds 13% of he crrenly se measremen range. Cres facor 3: Upk or Ipk exceeds approxmaely 3% of he crrenly se measremen range. Cres facor 6: Upk or Ipk exceeds approxmaely 6% of he crrenly se measremen range. On he WT332/WT333, when any of he eqpped np elemens mees any of he above condons, he measremen range s ncreased. Range Decrease The range s decreased when all of he followng condons are me. Urms or Irms s less han or eqal o 3% of he measremen range. Urms or Irms s less han or eqal o 125% of he nex lower measremen range. Cres facor 3: Upk or Ipk s less han or eqal o 3% of he nex lower measremen range. Cres facor 6: Upk or Ipk s less han or eqal o 6% of he nex lower measremen range. On he WT332/WT333, when all he np elemens mee all he above condons, he measremen range s decreased. Range Skppng (or procedres, see secon 2.6) Yo can selec whch measremen ranges o skp (range confgraon). Measremen ranges ha are no sed are skpped, and he WT3 seres swches beween he measremen ranges ha yo have chosen o enable. or example, when sng he ao range feare o measre he crren of a devce ha prodces 5 A n operaon mode and 5 ma n sandby mode, yo can confgre range skppng so ha he 1 A and 2 A ranges are dsabled. When yo are measrng he crren of he devce n sandby mode n he 5 ma range and he devce swches o operaon mode, he nermedae 1 A and 2 A ranges are skpped, and he devce swches o he 5 A range. Range skppng can redce he loss of measred daa ha can occr when ranges are swched one by one. Yo can rn range skppng on and off from he WT3 seres dsplay men. Yo can specfy whch measremen ranges o skp by sendng commncaon commands hrogh he commncaon nerface or by sng WTVewerreePls. Measremen range 5A When range skppng s off 2A 1A.5A When range skppng s on Range skp check box IM WT31-1N 1-7

15 1.2 Measremen Condons Peak Over Jmp Yo can se he measremen range o swch o when a peak over-range occrs and he ao range feare s enabled. Yo can se hs feare by sendng commncaon commands hrogh he commncaon nerface or by sng WTVewerreePls. When hs feare s dsabled and a peak over-range occrs, he WT3 seres rases he measremen range o he nex range ha has no been se o be skpped. Seng Measremen Ranges (or procedres, see secon 2.3) There are wo ways o se measremen ranges. Seng Measremen Ranges Usng he Measremen Range Men The measremen range men appears when yo press VOLTAG or CURRNT. Se he measremen range sng he and keys, and hen press ST. The measremen range wll change, and he measred daa dsplay wll reappear. Seng Measremen Ranges who Dsplayng he Measremen Range Men The measremen range men does no appear when yo press VOLTAG or CURRNT. Yo can se he measremen range sng he and keys. Press or o swch he measremen range. or a fxed perod of me, afer he crren range s dsplayed, he measred daa dsplay wll reappear. There s no need o press ST, so hs way of seng he measremen range s convenen n he followng saons. When yo swch he measremen range freqenly When yo wan o swch beween measremen ranges one by one and check he measred daa each me xample: When yo are searchng for a measremen range whn whch over ranges and peak over-ranges do no occr. Power Range The measremen range (power range) for measrng acve power, apparen power, and reacve power s deermned as ndcaed below n accordance wh he wrng sysem, volage range, and crren range. See appendx 3 for specfc power range vales. Wrng Sysem Power Range 1P2W (sngle-phase, wo-wre) Volage range crren range 1P3W (sngle-phase, hree-wre) Volage range crren range 2 3P3W (hree-phase, hree-wre) 3V3A (hree-volage, hree-crren mehod) 3P4W (hree-phase, for-wre) Volage range crren range 3 xernal Crren Sensor Range (Opon; for procedres, see secon 2.4) The op of crren sensors ha prodce volage, sch as shns and clamps, can be appled o an elemen s exernal crren sensor np connecor (XT) and measred. The ao range feare can be sed for hs appled volage as well. xernal Crren Sensor Converson Rao (Opon; for procedres, see secon 2.4) Se he converson rao sed o measre he sgnal receved by he exernal crren sensor np connecor (XT) from a crren sensor ha prodces volage. Se how many mllvols he crren sensor ransms when 1 A of crren s appled (converson rao). When sng a crren sensor ha prodces crren, se he converson rao as he CT rao. 1-8 IM WT31-1N

16 1.2 Measremen Condons Scalng (or procedres, see secon 2.5) Yo can se coeffcens for when yo apply a volage or crren sgnal from an exernal volage ransformer 1 or crren ransformer. 2 1 VT (volage ransformer) 2 CT (crren ransformer) 1 eares VT Rao and CT Rao Yo can se he VT or CT rao o conver he vales n he appled sgnal and dsplay he volage or crren vales or waveform from before he volage or crren ransformaon. Power Coeffcen By seng he power coeffcen (), yo can dsplay he measred acve power, apparen power, and reacve power afer hey have been mlpled by a coeffcen. Measremen ncon Daa before Transformaon Transformaon Resl Volage U U 2 (secondary op of he VT) U 2 V V: VT rao Crren I I 2 (secondary op of he CT) I 2 C C: CT rao Acve power P P 2 P 2 V C : Power coeffcen Apparen power S S 2 S 2 V C Reacve power Q Q 2 Q 2 V C Max./mn. volage Upk Upk 2 (secondary op of he VT) Upk 2 V Max./mn. crren Ipk Ipk 2 (secondary op of he CT) Ipk 2 C Cres acor (or procedres, see secon 2.7) The cres facor s defned as he rao of he peak vale of he waveform o he rms vale. I s also referred o as he peak-o-rms rao. Peak vale Cres facor (C, peak-o-rms rao) = Rms vale Peak vale Rms vale Inp sgnal waveform On he WT3 seres, he cres facor s he rao of he maxmm applcable peak vale o he measremen range. Cres facor (C, peak-o-rms rao) = Peak vale ha can be np Measremen range Yo can se he cres facor o 3 or 6. The measrable cres facor s as follows. Cres facor (C) = {Measremen range C seng (3 or 6)} Measred vale (rms vale) * However, he peak vale of he np sgnal ms be less han or eqal o he maxmm allowable np. If he cres facor of he np sgnal s greaer han he specfcaons of he WT3 seres (he cres facor defned a he raed np), yo can measre he sgnal by seng a greaer measremen range. or example, even f he cres facor s se o 3, measremen s possble for sgnals wh a cres facor greaer han or eqal o 5 when he measred vale (rms vale) s less han 6% of he measremen range. If he mnmm effecve np (1% of he measremen range) s beng appled when he cres facor s se o 3, measremen a a cres facor of 3 s possble. The volage range, crren range, effecve np range, and measremen accracy vary dependng on he cres facor seng. or deals, see chaper 7 n he Geng Sared Gde, IM WT31-2N. IM WT31-1N 1-9

17 1.2 Measremen Condons Measremen Perod (or procedres, see secon 2.8) Measremen Perod for Measremen ncons Used n Normal Measremen The measremen perod s deermned by he np sgnal ha s sed as he reference (synchronzaon sorce). The measremen perod s se whn he daa pdae nerval beween he frs pon where he sync sorce crosses he level-zero pon (cener of he amplde) on a rsng slope (or fallng slope) and he las pon where he sync sorce crosses he level-zero pon on a rsng slope (or fallng slope). Daa pdae nerval: Measremen perod Synchronzaon sorce Rsng zero crossng allng zero crossng If here s no more han one rsng or fallng slope whn he daa pdae nerval, he enre daa pdae nerval s se as he measremen perod. Daa pdae nerval: Measremen perod Synchronzaon sorce The measremen perod for deermnng he nmerc daa of he peak volage or peak crren s always he enre span of he daa pdae nerval. Therefore, he measremen perod for he followng measremen fncons, whch are deermned on he bass of he maxmm volage or crren, s also he enre span of he daa pdae nerval. Peak volage (U+pk/U-pk), peak crren (I+pk/I-pk), and peak power (P+pk/P-pk) or deals, see appendx 5. Measremen Perod for Measremen ncons Used n Harmonc Measremen (Opon) The measremen perod exends from he frs sample n he daa pdae nerval for 124 pons, coned a he harmonc samplng freqency. The WT3 seres deermnes he harmonc samplng freqency aomacally based on he perod of he sgnal ha s se as he PLL sorce. The samplng daa and measremen perod ha are sed o deermne he vales of harmonc measremen fncons may be dfferen from hose sed o deermne he vales of normal measremen fncons. Daa Updae Inerval (or procedres, see secon 2.1) The daa pdae nerval s he nerval a whch sampled daa s acqred and measremen fncons are comped, dsplayed, ransmed, and op hrogh D/A converson. Yo can selec he daa pdae nerval from he opons below..1 s,.25 s,.5 s, 1 s, 2 s, and 5 s A each daa pdae nerval, he nmerc daa s pdaed, sored, convered and op as analog sgnals, and ransmed hrogh he commncaon nerface. To capre relavely fas load flcaons n he power sysem, selec a fas daa pdae nerval. To capre low freqency sgnals, selec a slow daa pdae nerval. 1-1 IM WT31-1N

18 Inp lers (or procedres, see secon 2.9) There are wo ypes of np flers: he lne fler and he freqency fler. 1.2 Measremen Condons Lne ler Becase he lne fler s nsered no he volage and crren measremen np crcs, drecly affecs volage, crren, and power measremens (see he block dagram n appendx 7). When he lne fler s rned on, measred vales do no conan hgh freqency componens. Ths, he volage, crren, and power of nverer waveforms, dsored waveforms, ec., can be measred wh her hgh freqency componens elmnaed. 1 eares reqency ler The freqency fler s nsered no he freqency measremen np crc and affecs freqency measremens. I also affecs he deecon of he measremen perod for volage, crren, and power measremens (see appendx 4). In hs case, he fler also acs as a fler for deecng he zerocrossng of he synchronzaon sorce sgnal more accraely. The freqency fler s no nsered no he volage and crren measremen np crcs. Therefore, he measred vales nclde hgh freqency componens even when he freqency fler s rned on. Averagng (or procedres, see secon 2.11) Yo can ake exponenal or movng averages of he nmerc daa. The averagng fncon s sefl when becase of large changes n he power or load or a low np sgnal freqency, he nmerc dsplay flcaes and s dffcl o read. Trnng Averagng On and Off Measremen ncons Used n Normal Measremen Yo can selec wheher o average vales. When yo enable averagng (ON), he AVG ndcaor llmnaes. Measremen ncons Used n Harmonc Measremen (Opon) If averagng s rned on, and he averagng ype s P (exponenal averagng), averagng s performed on harmonc measremen fncons. ven f averagng s rned on, f he averagng ype s Ln (movng average), averagng s no performed on harmonc measremen fncons. Averagng Types Yo can se exponenal or movng averages. xponenal Averagng Wh he specfed aenaon consan, he nmerc daa s exponenally averaged accordng o he eqaon below. Dn = (Mn Dn 1) Dn 1+ K Dn: Dsplayed vale ha has been exponenally averaged n mes. (The frs dsplayed vale, D 1, s eqal o M 1.) Dn 1: Dsplayed vale ha has been exponenally averaged n 1 mes. Mn: Nmerc daa a he n h me. K: Aenaon consan (selec from 8, 16, 32, and 64) IM WT31-1N 1-11

19 1.2 Measremen Condons Movng Average The specfed average con s sed o compe lnear averages accordng o he eqaon below. Dn = Mn (m 1)+ Mn 2+Mn 1+Mn m D n: Dsplayed vale of he lnear average of m ems of nmerc daa from he n (m 1) h o he n h me M n (m 1): Nmerc daa a he n (m 1) h me M n 2: Nmerc daa a he n 2 h me M n-1: Nmerc daa a he n 1 h me M n: Nmerc daa a he n h me m: Average con (selec from 8, 16, 32, and 64) Measremen ncons Tha Are Averaged The measremen fncons ha are drecly averaged are ndcaed below. Oher fncons ha se hese fncons n her compaon are also affeced by averagng. or deals abo how he vales of measremen fncons are deermned, see appendx 1 n he Geng Sared Gde, IM WT31-2N. Measremen ncons Used n Normal Measremen U, I, P, S, and Q λ, Φ, Cf U, and Cf I are comped sng he averaged vales of Urms, Irms, P, S, and Q. Measremen ncons Used n Harmonc Measremen (Opon) U(k), I(k), and P(k) λ(k) and Φ(k) are comped sng he averaged vales of P(k) and Q(k). Uhd, Ihd, Uhdf(k), Ihdf(k), and Phdf(k) are comped sng he averaged vales of U(k), I(k), and P(k). k: The harmonc order Q(k): reacve power of harmonc order k Measremen ncons Tha Are No Averaged The followng measremen fncons are no averaged. Measremen ncons Used n Normal Measremen fu, fi, U+pk, U pk, I+pk, I pk, P+pk, P pk, Tme, WP, WP+, WP, q, q+, and q Measremen ncons Used n Harmonc Measremen (Opon) ΦU(k), ΦI(k), and fpll 1-12 IM WT31-1N

20 1.3 Holdng Measred Vales and Performng Sngle Measremens Holdng Measred Vales (HOLD; for procedres, see secon 3.1) Yo can se he hold operaon o sop measrng and dsplayng he measred daa a each daa pdae nerval and hold he dsplay of all measremen fncon daa. The D/A op, commncaon op, and oher vales reflec he held vales. 1 eares Sngle Measremen (SINGL; for procedres, see secon 3.2) Whle he dsplay s held, he sgnal s measred once a he daa pdae nerval, and hen he dsplay s re-held. If yo press SHIT+HOLD (SINGL) when he dsplay s no held, measremen resars from ha pon. IM WT31-1N 1-13

21 1.4 Measrng Power Dsplayng Measred Daa (or procedres, see secon 4.1 o 4.5) Yo can dsplay volage, crren, and power vales and oher measremen daa on he dsplay. The measred daa s dsplayed on for red, hgh-nensy, 7-segmen LD dsplays. Yo can observe 4 vales a he same me. or nformaon abo he measremen fncon symbols ha are dsplayed and her meanngs, see Iems Tha Ths Insrmen Can Measre. MAX Hold (or procedres, see secon 4.6) Yo can hold he maxmm vales of U, I, P, S, Q, U+pk, U-pk, I+pk, I-pk, P+pk, and P-pk. Whle he MAX hold feare s on, maxmm vales are held. Compaon ncons ffcency (Only apples o he WT332/WT333; for procedres, see secon 4.5) Yo can compe he effcency. Cres acor (or procedres, see secon 4.5) Deermnes he volage or crren cres facor by dvdng he peak vale by he rms vale. Basc Arhmec (or procedres, see secon 4.5) Dsplays sx ypes of comped resls. (A+B, A B, A*B, A/B, A 2 /B, and A/B 2 ) Average Acve Power drng Inegraon (or procedres, see secon 4.5) Yo can compe he average acve power whn he negraed perod. The WT3 seres deermnes he average acve power by dvdng he wa hor (negraed acve power) by he negraon me IM WT31-1N

22 1.5 Inegraed Power (Wa hor) 1 Yo can negrae he acve power (wa hor) and crren (ampere hor). or nformaon abo he measremen fncon symbols for negraed power (wa hor) and her meanngs, see Iems Tha Ths Insrmen Can Measre. eares Inegraon Modes (or procedres, see secon 5.2) The negraon feare has he followng hree modes. Inegraon Mode Sar Sop Repeon Manal negraon mode Key operaon Key operaon --- Sandard negraon mode Key operaon Sopped by he mer --- Connos (repeve) negraon mode Key operaon Key operaon Repeas when he mer expres Manal Inegraon Mode When yo se he negraon mode o sandard negraon mode (nor) and se he negraon mer o ::, he WT3 seres performs negraon n manal negraon mode. When yo press START, negraon sars, and connes nl yo press STOP. However, f eher of he condons below s me, negraon s sopped, and he negraon me and negraed vale are held. The negraon me reaches he maxmm negraon me (1 hors). The negraed vale reaches s maxmm or mnmm dsplayable vale. Hold Hold Inegraed vale When he maxmm negraed vale s reached Inegraon me Hold Hold Sar Sop Rese Sar Rese IM WT31-1N 1-15

23 1.5 Inegraed Power (Wa hor) Sandard Inegraon Mode Yo can se a relave negraon me (se a mer). Inegraon sars when yo press START. When one of he condons below s me, negraon s sopped, and he negraon me and negraed vale are held. The specfed mer me elapses. Yo press STOP. The negraed vale reaches s maxmm or mnmm dsplayable vale. Hold Inegraed vale Hold Inegraon me Tmer vale Sar Rese Connos Inegraon Mode Yo can se a relave negraon me. Inegraon sars when yo press START. When he specfed negraon mer me elapses, negraon s aomacally rese and resared. Inegraon repeas nl yo press Sop. If eher of he condons below s me, negraon s sopped, and he negraon me and negraed vale are held. Yo press STOP. The negraed vale reaches s maxmm or mnmm dsplayable vale. Inegraed vale Hold Inegraon me Hold Tmer vale Sar Tmer vale Tmer vale Sop Rese Inegraon Mehods (qaons) or nformaon on he eqaons sed for negraon, see appendx IM WT31-1N

24 1.6 Harmonc Measremen (Opon) 1 Usng harmonc measremen, yo can measre volage, crren, and acve power p o he 5h harmonc; he harmonc dsoron facor for each harmonc order; and he phase angle of each harmonc order wh respec o he fndamenal wave (1s harmonc). Yo can also compe he oal rms vales (fndamenal wave + harmoncs) for volage, crren, and acve power and he oal harmonc dsoron (THD). or a ls of he symbols for he measremen fncons ha can be measred wh harmonc measremen and her descrpons, see Harmonc Measremen ncons nder Iems Tha Ths Insrmen Can Measre. eares PLL Sorce (or procedres, see secon 6.3) or harmoncs o be measred, he fndamenal perod (he perod of he fndamenal sgnal) ha wll be sed o analyze he harmoncs ms be deermned. The sgnal for deermnng he fndamenal perod s he PLL (phase locked loop) sorce. or sable harmonc measremen, se an np sgnal wh low dsoron and few flcaons as he PLL sorce. or explanaons of he erms fndamenal wave, harmoncs, harmonc orders, and oher erms, see appendx 2. Toal Harmonc Dsoron qaon (or procedres, see secon 6.3) Yo can selec he eqaon for deermnng he oal harmonc dsoron from he opons lsed below. The followng explanaons are for when he pper lm of measred harmonc order s 5. If he maxmm nmber of measred harmonc orders s less han 5, he eqaon wll be appled o he harmonc orders p o he specfed maxmm nmber. IC: The rao of he rms vale of harmoncs 2 o 5 o he rms vale of he fndamenal wave (1s harmonc) s calclaed. CSA: The rao of he rms vale of harmoncs 2 o 5 o he rms vale of harmoncs 1 o 5 s calclaed. IM WT31-1N 1-17

25 1.7 Sorng Measred Daa and Savng and Loadng Sep Parameers Measred daa and sep parameers are sored n nernal memory. Sorng Measred Daa (or procedres, see secon 7.1) All of he daa obaned n a sngle daa pdae nerval s sored as a sngle block. The nmber of daa ems vares dependng on he nmber of eqpped np elemens. As a resl, he nmber of blocks ha can be sored vares dependng on he devce. Yo canno load and dsplay sored measremen daa on he WT3 seres dsplay. Yo can se commncaon fncons o send sored measremen daa o a PC, and yo can hen vew he daa on he PC. Savng and Loadng Sep Parameers (or procedres, see secon 7.2) Yo can save for ses of sep parameers on he WT3 seres. Yo can load saved sep parameers and resore he saved sengs IM WT31-1N

26 1.8 Commncaon ncons 1 When yo connec he WT3 seres o a PC, yo can save measred daa o he PC and change he WT3 seres sengs from he PC. eares The WT3 seres can be eqpped wh he followng commncaon nerfaces. USB GP-IB (sffx code: -C1) RS-232 (sffx code: -C2) herne (sffx code: /C7) WTVewerreePls Yo can se he WTVewerreePls applcaon ha comes wh he WT3 seres o save measred daa o a PC and change he WT3 seres sengs who creang yor own commncaon conrol programs. PC monor WT31 or WT31HC WT332/WT333 Saved daa Seng changes xample of a wndow for confgrng he WT3 seres xample of a wndow showng measred daa IM WT31-1N 1-19

27 1.9 Oher eares Inalzng Sep Parameers (or procedres, see secon 8.2) Yo can se hs feare o resore he sep parameers o he facory defal sengs. Zero-Level Compensaon (or procedres, see secon 8.3) Zero-level compensaon refers o he process wheren he WT3 seres creaes a zero np condon n s nernal crcry and ses he zero level o he level a ha pon. Zero-level compensaon ms be performed o sasfy he specfcaons of hs nsrmen. When he measremen range s changed, zero-level compensaon s performed aomacally. However, f he measremen range s no changed for a long me, he zero level may shf de o envronmenal changes arond he nsrmen. In hs case, yo can manally perform zero-level compensaon. D/A Op (Opon; for procedres, see secon 8.4) Yo can op volage, crren, acve power, apparen power, reacve power, power facor, phase angle, freqency, volage peak, crren peak, and negraed vales as a ±5 V S DC volage. Yo can op vales sng 4 op channels on he WT31/WT31HC and 12 op channels on he WT332/WT333. Remoe Conrol (Opon; for deals, see chaper 5 of he Geng Sared Gde, IM WT31-2N) On models wh he /DA4 or /DA12 opon, yo can conrol he WT3 seres sng a negave TTL plse sgnal and op logc sgnals. xernal Inp The followng fve ypes of conrol sgnals are avalable. XT HOLD Holds dsplayed vales or releases he held sae. XT TRIG Updaes he dsplayed vales when hey are beng held. XT START Sars negraon. XT STOP Sops negraon. XT RST Reses he negraon resl. xernal Op The followng sgnal s op drng negraon. INTG BUSY Ths sgnal s op connosly from he sar o he sop of negraon. Key Proecon (or procedres, see secon 8.5) Yo can dsable all panel keys oher han he power swch and he KY PROTCT swch. 1-2 IM WT31-1N

28 Chaper 2 Measremen Condons 2.1 Seng he Measremen Mode Procedre Press SHIT+VOLTAG (MOD) o selec he measremen mode. ach me yo press SHIT+VOLTAG (MOD), he measremen mode changes n he order shown below. xplanaon Measremen Mode One of he followng measremen modes can be seleced for he measremen of volage and crren. The defal seng s RMS. 2 Measremen Condons Indcaor Volage Crren RMS Tre rms vale Tre rms vale VOLTAG MAN Recfed mean vale Tre rms vale calbraed o he rms vale DC Lnear average Lnear average Theorecal qaons RMS Selec hs mode o dsplay he re rms vales of he volage and crren. 1 T T () 2 d f() : Inp sgnal T : One perod of he np sgnal VOLTAG MAN Selec hs mode o dsplay he volage as a recfed mean vale calbraed o he rms vale. A sne wave s sed o calbrae he vale o he rms vale, so when sne waves are measred, he vales obaned n hs mode are he same as hose obaned n RMS mode. The vales dffer from hose obaned n RMS mode when waves oher han sne waves, sch as dsored waves and DC waves, are measred. π T T () d f() : Inp sgnal T : One perod of he np sgnal DC Selec hs mode when he np volage or crren s DC. The np sgnal s lnearly averaged, and he resl s dsplayed. IM WT31-1N 2-1

29 2.1 Seng he Measremen Mode Typcal Waveform Types and Dfferences n Measred Vales beween Measremen Modes The WT3 seres does no sppor he recfed mean vale measremen mode shown n he able below. Name Waveform Measremen Mode Dsplay Rms Vale RMS Recfed Mean Vale Recfed Mean Vale Calbraed o he Rms Vale VOLTAG MAN Lnear Average DC Sne wave π 2π p p 2 2 π p p 2 Half-wave recfcaon π 2π p p 2 p π p 2 2 p π ll-wave recfcaon π 2π p p 2 2 π p p 2 2 π p Drec crren p p p π 2 2 p p Tranglar wave π 2π p p 3 p 2 π 4 2 p Sqare wave π 2π p p p π 2 2 p Plse τ 2π p τ 2π p D p τ 2π p D p π τ 4π 2 p τ When he above s expressed sng dy D (= ) 2π πd τ 2π p 2 2 p D p 2-2 IM WT31-1N

30 2.2 Confgrng he Wrng Sysem Sengs (WT332/WT333 only) Procedre Press WIRING o selec he wrng sysem. ach me yo press WIRING, he wrng sysem changes n he order shown below. The WT31 and WT31HC only have one np elemen, so here s no wrng sysem selecon. WT332 (2 np elemens) WT333 (3 np elemens) 1P3W 3P4W 1P3W 3P4W 3P3W 3V3A 3P3W 3V3A 2 Measremen Condons xplanaon Wrng Sysem The wrng sysems ha yo can selec vary dependng on he model. WT31 and WT31HC The WT31 and WT31HC are only eqpped wh one np elemen. Yo can measre sngle-phase, wo-wre sysems. Becase here s only one np elemen, yo canno selec dfferen wrng sysems. WT332 (WT33 Two Inp lemen Model) The WT332 s eqpped wh wo np elemens (elemen 1 and elemen 3). On he WT332, yo can selec he followng wrng sysems. Wrng Sysem Descrpon lemens 1P3W Sngle-phase, hree-wre lemen 1 and elemen 3. 3P3W Three-phase, hree-wre lemen 1 and elemen 3. The measred daa when a sngle-phase, wo-wre sysem (1P2W) has been specfed s he measred daa for elemens 1 and 3. The measred daa for a sngle-phase, wo-wre sysem wll be measred correcly regardless of whch of he above wrng sysems yo selec. WT333 (WT33 Three Inp lemen Model) The WT333 s eqpped wh hree np elemens (elemen 1, elemen 2, and elemen 3). On he WT333, yo can selec he followng wrng sysems. Wrng Sysem Descrpon lemens 1P3W Sngle-phase, hree-wre lemen 1 and elemen 3. lemen 2 s for a snglephase, wo-wre sysem. 3P3W Three-phase, hree-wre lemen 1 and elemen 3. lemen 2 s for a snglephase, wo-wre sysem. 3P4W Three-phase, for-wre lemens 1, 2, and 3. 3V3A Three-volage, hree-crren mehod lemens 1, 2, and 3. The measred daa when a sngle-phase, wo-wre sysem (1P2W) has been specfed s he measred daa for elemens 1, 2, and 3. The measred daa for a sngle-phase, wo-wre sysem wll be measred correcly regardless of whch of he above wrng sysems yo selec. Noe Selec a wrng sysem ha maches he conneced crc nder measremen. The nernal processng of he WT3 seres vares dependng on he seleced wrng sysem. If he seleced wrng sysem does no mach he acal crc, measremens and compaon wll no be correc. or he relaonshp beween he wrng sysems and he mehod of deermnng he measred vales or comped vales, see page appendx 1. IM WT31-1N 2-3

31 2.3 Seng he Measremen Range When Usng Drec Inp Procedre ollow he procedre ndcaed by he hck lnes n he followng men. Measremen Range Mode 1. Selec he measremen range mode. (Dsplay B) (Dsplay C) 5. (Dsplay D) Confrm he seng. Close men. Volage Range n Men Confgraon Mode 1. (Dsplay C) Confrm he seng. The opons on he lef appear when he cres facor has been se o 3. The followng opons appear when he cres facor has been se o 6. Ao, 3, 15, 75, 3, 15, 7.5 Crren Range n Men Confgraon Mode WT31 1. (Dsplay C) Confrm he seng. The n s A. The opons on he lef appear when he cres facor has been se o 3. The followng opons appear when he cres facor has been se o 6. Ao 1, 5, 2.5, 1,.5,.25 A 1, 5, 25, 1, 5, 2.5 ma SnSor The n s ma. 2-4 IM WT31-1N

32 2.3 Seng he Measremen Range When Usng Drec Inp WT31HC 1. (Dsplay C) Confrm he seng. 2 The above opons appear when he cres facor has been se o 3. The followng opons appear when he cres facor has been se o 6. Ao, 2, 1, 5, 2.5, 1,.5, SnSor Measremen Condons WT332/WT (Dsplay C) Confrm he seng. The above opons appear when he cres facor has been se o 3. The followng opons appear when he cres facor has been se o 6. Ao, 1, 5, 2.5, 1,.5,.25, SnSor Noe SnSor only appears when he exernal crren sensor np opon s nsalled. or deals abo he procedre when selecng SnSor, see secon 2.4. Volage and Crren Range n Qck Confgraon Mode 1. Press he VOLTAG or CURRNT key. In qck confgraon mode, he VOLTAG or CURRNT key and he and keys llmnae. No dsplay appears on he men. The crrenly se range appears emporarly n dsplay B, for he volage range, or dsplay D, for he crren range, and hen he measred daa reappears. IM WT31-1N 2-5

33 2.3 Seng he Measremen Range When Usng Drec Inp 2. Use or o selec he range. Whle yo are changng he range, he range appears emporarly n dsplay B, for he volage range, or dsplay D, for he crren range. 3. Press SHIT+ ( ) o rn he ao range feare on and off. 4. Press he VOLTAG or CURRNT key o confrm he seng. The VOLTAG or CURRNT key lgh and he and key lghs rn off. xplanaon Measremen Range Modes There are wo modes for seng he measremen range: men confgraon mode (on) and qck confgraon mode (o). The defal seng s men confgraon mode (on). Men Confgraon Mode (on) A men for seng he range s dsplayed. Yo can selec he measremen range n dsplay C. Measred daa s no dsplayed whle yo are confgrng he seng. Qck Confgraon Mode (o) Yo can swch he measremen range or enable he ao range feare whle dsplayng he measred daa. The sengs ha yo can choose from are he same as hose ha yo can choose from n men confgraon mode. Ths mode s sefl n he followng crcmsances. When yo swch he measremen range freqenly When yo wan o swch beween measremen ranges one by one and check he dsplay n each range (when yo are searchng for a measremen range whn whch over ranges and peak overranges do no occr) Noe In qck confgraon mode, when yo press he VOLTAG or CURRNT key, he VOLTAG or CURRNT key and he and keys llmnae. When yo press STUP or some oher men key n qck confgraon mode, qck confgraon mode s emporarly dsabled. When yo rern o he dsplay of he measred daa, qck sep mode s enabled agan. xed (Manal) Ranges and Ao Range Se he measremen ranges accordng o he rms vale levels. Yo can specfy fxed measremen ranges or have he ranges se aomacally. The defal seng s o have he ranges se aomacally. xed Ranges Yo can selec a fxed volage range from a ls of opons. ven f he sze of he np sgnal changes, he seleced volage range wll no change. Se he ranges accordng o he rms vales of he np sgnal. Volage Ranges When he cres facor s 3, yo can selec 6 V, 3 V, 15 V, 6 V, 3 V, or 15 V. When he cres facor s 6, yo can selec 3 V, 15 V, 75V, 3 V, 15V, or 7.5 V. 2-6 IM WT31-1N

34 2.3 Seng he Measremen Range When Usng Drec Inp Crren Range WT31 When he cres facor s 3, yo can selec 2 A, 1 A, 5 A, 2 A, 1 A,.5 A, 2 ma, 1 ma, 5 ma, 2 ma, 1 ma, or 5 ma. When he cres facor s 6, yo can selec 1 A, 5 A, 2.5 A, 1 A,.5 A,.25 A, 1 ma, 5 ma, 25 ma, 1 ma, 5 ma, or 2.5 ma. WT31HC When he cres facor s 3, yo can selec 4 A, 2 A, 1 A, 5 A, 2 A, or 1 A. When he cres facor s 6, yo can selec 2 A, 1 A, 5 A, 2.5 A, 1 A, or.5 A. WT332/WT333 When he cres facor s 3, yo can selec 2 A, 1 A, 5 A, 2 A, 1 A, or.5 A. When he cres facor s 6, yo can selec 1 A, 5 A, 2.5 A, 1 A,.5 A, or.25 A. Noe When he WT31 s measrng sng one of he followng fxed crren ranges and receves excessve np for a gven perod of me, o proec he np crc, he WT31 forceflly changes he crren range o 1 A (.5 A f he cres facor s 6) and swches from fxed range mode o ao range mode. When he cres facor s 3, yo can selec 2 ma, 1 ma, 5 ma, 2 ma, 1 ma, or 5 ma. When he cres facor s 6, yo can selec 1 ma, 5 ma, 25 ma, 1 ma, 5 ma, or 2.5 ma. 2 Measremen Condons Ao Range (Ao) The WT3 seres aomacally swches he range accordng o he sze of he np sgnal. Range Increase The range s ncreased when any of he followng condons s me. Urms or Irms exceeds 13% of he measremen range. Cres facor 3: Upk or Ipk exceeds approxmaely 3% of he crrenly se measremen range. Cres facor 6: Upk or Ipk exceeds approxmaely 6% of he crrenly se measremen range. On he WT332/WT333, when any of he eqpped np elemens mees any of he above condons, he measremen range s ncreased. Range Decrease The range s decreased when all of he followng condons are me. Urms or Irms s less han or eqal o 3% of he measremen range. Urms or Irms s less han or eqal o 125% of he nex lower measremen range. Cres facor 3: Upk or Ipk s less han or eqal o 3% of he nex lower measremen range. Cres facor 6: Upk or Ipk s less han or eqal o 6% of he nex lower measremen range. On he WT332/WT333, when all he np elemens mee all he above condons, he measremen range s decreased. Noe When he ao range feare s enabled and an rreglar plse waveform s appled, a seady range may no be mananed. If hs occrs, specfy a fxed range. IM WT31-1N 2-7

35 2.3 Seng he Measremen Range When Usng Drec Inp Checkng a Range To check he crrenly se range drng measremen, press VOLTAG or CURRNT. The se range wll appear on he dsplay. To rern o he measred vale dsplay n men confgraon mode, press he same key agan. In qck confgraon mode, he range s only dsplayed for he draon of he daa pdae nerval before he measred vale dsplay s resored. Measred vale dsplay Measred vale dsplay Power Range The measremen range (power range) for measrng acve power, apparen power, and reacve power s deermned as ndcaed below n accordance wh he wrng sysem, volage range, and crren range. Wrng Sysem Power Range 1P2W (sngle-phase, wo-wre) Volage range crren range 1P3W (sngle-phase, hree-wre) 3P3W (hree-phase, hree-wre) Volage range crren range 2 3V3A (hree-volage, hree-crren mehod) 3P4W (hree-phase, for-wre) Volage range crren range 3 The maxmm dsplay s (when he nmber of dsplayed dgs s se o 5). When he resl of mlplyng he volage range by he crren range reaches or exceeds 1 W, he n on he dsplay wll change o kw. When he resl exceeds 1 kw, he n on he dsplay wll change o MW. or specfc volage and crren range combnaons and power range vales, see appendx 3. Noe In ao range mode, becase he volage and crren ranges swch ndependenly accordng o range ncrease and decrease condons, dfferen power ranges may be se for he same measred or comped power vale. If yo open he volage np ermnal, a volage vale of p o.3 V may be dsplayed de o hm nose a he power lne freqency of 5 Hz or 6 Hz and oher phenomena. Ths s becase of he hgh np ressance of he volage np ermnal. Shorng he ermnal wll resl n a vale of V. 2-8 IM WT31-1N