Epril 15, 2020
Insay fayv kɔmyunikeshɔn ɛn fotovoltayk sistem, ɔltin de dipen pan layt. If dɛn kin gɛt signal kɔrɛkt wan, na di optik pawa nɔmɔ kin disayd. Di optik pawa mita (OPM) na di mɔs besik tul fɔ mɛzhɔ optik signal trɛnk — if yu nɔ gɛt am, fayba link tɛst tan lɛk fɔ fil fɔ puls na dak.
Insay fayv kɔmyunikeshɔn ɛn fotovoltayk sistem, ɔl di signal transmishɔn de dipen pan layt. Ɛn di trɛnk we da layt de gɛt de sho dairekt wan if dɛn go ebul fɔ gɛt di signal kɔrɛkt wan. Di optik pawa mita (OPM) na di mɔs besik tul fɔ mɛzhɔ optik signal trɛnk — if yu nɔ gɛt am, fayba link tɛst tan lɛk fɔ fold yusɛf ɛn gɛs.
Di kor prinsipul nɔto kɔmpleks: wan fotoditekta (tipikli wan InGaAs ɔ jemaniɔm fotodayɔd) de kɔnvɔyt insidɛnt ɔptik signal dɛn to ilɛktrik signal dɛn, ɛn di sɔrkwit de kɔnvɔyt dɛn wan dɛn to pawa ridin dɛn we dɛn ɛksprɛs insay dBm (dɛsibɛl-miliwat) ɔ μW (maykrowat). dBm na wan logaritmik yunit: 0dBm = 1mW, -10dBm = 0.1mW, -30dBm = 0.001W. Di valyu fɔ dBm na dat i de kip ridin dɛn we pɔsin kin rid ivin we optik pawa span ɔda magnitud — wan fayba link wit 0dBm transmit pawa ɛn -25dBm risiv pawa gɛt 25dB atenueshɔn, we min 300 tɛm less pawa na di risiva, bɔt dɛn ɛksprɛs am as wan nɔmba: 25.
Di OPM na impɔtant tin pas fɔ bi opshɔnal bikɔs i de sav tri wok dɛn we nɔ go ridyus. Fɔs, i de mɛzhɔ transmit-sayd ɔtput pawa fɔ kɔnfɔm di layt sɔs de ɔpreshɔn insay spek. Sɛkɔn, i de mɛzhɔ di risiv-sayd input pawa fɔ kɔnfɔm se di signal de ɔp di risiva in sɛnsitiviti trɛshɔld. Tɔd, we yu pul di tu yield link lɔs — di singl mɔs impɔtant mɛtrik fɔ jɔj fayv link kwaliti. tכgeda, dεn tri fכnshכn dεm ya de kכnstכt wan komplit fכshal egzamin fכ εvri fayv link.
Wan mistek we pipul dɛn kin tink na dat OPM na fɔ lɛbɔraytri nɔmɔ. In rialiti, fil injinia dɛn de yuz dɛn ɛvride — fɔ fayba bakhol akseptɛns na tɛlikɔm bays steshɔn, fayba intakɔnekshɔn tɛst na data sɛnta, ɛn fayba kɔmyunikeshɔn link chɛk na PV plant. Di PK56A na dizayn spɛshal fɔ fil yuz, balans laboratori-grɛd prɛsishɔn wit hanheld pɔtabiliti.
We yu de pik wan OPM, tri paramita dɛn de disayd. Get eni wan rong en di test rizults no valid.
Fɔs: wevlɛnj. Layt insay fayv nɔto wayt layt — na laser ɔ LED layt we gɛt spɛshal wɛvlɛnj. Kɔmɔn fayba kɔmyunikeshɔn wɛvlɛnj dɛn inklud 850nm (multimode), 1310nm (singl-mode), 1550nm (singl-mode), ɛn 1625nm (fɔ DWDM sistem tɛst). Di OPM fɔ kalibrayt na di kɔrɛkt wɛvlɛnj档位 bikɔs ditektɔ rispɔnsiti de difrɛn wit wɛvlɛnj — di sem ditektɔ kin tu tɛm sɛnsitiv na 850nm pas na 1550nm. Yuz di 850nm kalibreshɔn kɔv fɔ mɛzhɔ 1550nm layt kin prodyuz ridin ɔf bay 20% ɔ mɔ. Di PK56A sɔpɔt sɛvin wevlɛnj sɛtin dɛn we de kɔba 850nm tru 1625nm, we de mach men kɔmyunikeshɔn wɛvlɛnj dɛn — nɔ wevlɛnj mismatch fɔ wɔri bɔt na di fil.
Sɛkɔn: pawa rɛnj. Di rεnj de ditarεmin aw strכng wan layt signal di OPM kin mεzj. Tu smɔl rɛnj kin mek i pwɛl di ditektɔ wit strɔng layt; tu big rεnj nכ kin mεzj wik layt. Fild test optik pawa tipikli span -70dBm to +10dBm. -70dBm na di lכw sεnsitiviti limit fכ mכst risiva dεm; +10dBm na di maksimal autput fɔ mɔs layt sɔs. Di PK56A rεnj de kכba -70dBm to +10dBm, we de mach mכst fil sεnariכ dεm.
Tɔd: prɛsishɔn. OPM prɛsishɔn na tipikli ɛksprɛs as ±0.1dB to ±0.3dB. ±0.1dB min insay 2% mistek — prɛmiɔm gred. ±0.3dB min bכt 7% mistek — adekwayt fכ mכst εnjinia akseptans. Prɛsishɔn impɔtant bikɔs if wan OPM gɛt ±0.3dB akkuracy ɛn di injinɛri spɛshal nid link lɔs mistek insay ±0.5dB, di OPM nɔmɔ de akɔn fɔ 60% pan di alawd mistek badjɛt, we de lɛf smɔl margin fɔ di link sɛf.
Tradishɔnal fayv tɛst bin nid bɔku divays dɛn: wan OPM fɔ pawa, wan rɛd-layt pen fɔ di say we di fɔlt de, ɛn wan layt sɔs fɔ tɛst signal injɛkshɔn. Di PK56A intagret ɔl tri insay wan hanheld divays, ɛn in kɔr valyu na fɔ bi ɔl-in-wan.
Di PK56A in men bɔdi na OPM we de sɔpɔt sɛvin wevlɛnj ɛn -70dBm to +10dBm rɛnj. Pan tap dat, i gɛt wan bilt-in rɛd layt sɔs (650nm) we de injɛkt rɛd layt insay di fayv tru FC/UPC ɔ SC/UPC adapt. Di rɛd layt de du sɔntin we pɔsin kin si: we dɛn put rɛd layt insay fayv, if brek de na di midul, rɛd layt kin lik kɔmɔt na di brek ɛn i kin bi fɔ si wit di yay. Dis na spɛshal tin fɔ sɔlv prɔblɛm wit fayba jɔmpa — nɔ nid fɔ gɛt OTDR (ɔptik tɛm domɛyn riflɛktɔmita, wan divays we de kɔst tɛn tawzin yuan). Jɔs wan PK56A kin disayd kwik kwik wan if pɔsin we de jomp gud.
Di PK56A de sɔpɔt bak yunivasal fayba intafɛs. FC, SC, ST, LC, ɛn ɔda intafɛs tayp dɛn de sɔpɔt bay we dɛn de chenj adapt dɛn — nɔ nid fɔ gɛt sɛpret divays dɛn fɔ ɛni intafɛs tayp. Insay di fil, difrɛn sistɛm dɛn de yuz difrɛn intafɛs — SC na tɛlikɔm, LC na data sɛnta, FC na CATV — ɛn di PK56A in mɔlti-intafɛs sɔpɔt min se wan divays de handle ɔl di sɛnɛriɔ dɛn.
In prɔsis, di PK56A de ad valyu tru ɔpreshɔnal simpuliti. I displei de sho ɔl tu di dBm ɛn μW ridin dɛn wan tɛm, ɛn i de sho dairekt wan if di tɛst rizɔlt de insay spec (PASS / WARNING / FAIL) — nɔ manual tebul lukap dɛn nid. I de kip di tɛst rizɔlt fɔ kɔmpia am wit istri data.
Insay fil fayv tɛst prɔsis, sɔm mistek dɛn we kin apin bak kin mek pɔsin lɔs we nɔ nid fɔ apin. We wi ɔndastand dɛn, dat kin mek wi nɔ gɛt rial prɔblɛm. Di fɔs mistek na fɔ nɔ chɛk di wevlɛnj sɛtin bifo yu mɛzhɔ. As wi bin dɔn tɔk, OPM kalibreshɔn kɔv dɛn kin difrɛn bay wɛvlɛnj. We yu sɛt di rɔng wevlɛnj档位 i de mek yu ridin ɔf bay 10% to 20%. Bɔku fil wokman dɛm, fɔ sev trɔbul, de yuz di sem wevlɛnj档位 fɔ ɔl di mɛzhɔmɛnt dɛm — dis kin devyate 10% to 20% we dɛn de mɛzhɔ 1310nm ɛn 1550nm singl-mɔd fayba.
Di sɛkɔn mistek na fɔ ignore di fayv ɛnd-fes klin. Dɔst, ɔyl, ɔ skrach na di fayv ɛnd-fes (kɔnekta ɛnd-fes) kin mek ɛkstra insayshɔn lɔs ɛn riflekshɔn, ɛn di tɛst rizɔlt kin misattribute ɛnd-fes kɔntaminɛshɔn as fayv link kwaliti prɔblɛm. Wan simpul we fɔ chɛk yusɛf: bifo yu tɛst, inspɛkt di ɛnd-fes wit magnifying lens. If i dɔti, klin wit wan dediket fayv klin stik ɛn anhydrous alcohol bifo yu mɛzhɔ. Bɔku ‘link lɔs pas spɛshal’ fayl dɛn kin sɔlv dɛnsɛf afta dɛn dɔn klin di ɛnd-fes.
Di tɔd mistek na fɔ tɛst wan fayv nɔmɔ. insay fayv link, i kin bi se tu fayv dεm de — wan fכ transmit (Tx), wan fכ risiv (Rx). Link loss kin difrɛn bitwin di tu. We yu tɛst wan nɔmɔ ɛn disayd fɔ du sɔntin, dat kin mek yu nɔ gɛt prɔblɛm wit di ɔda wan. Di kɔrɛkt we fɔ du am na fɔ tɛst ɔl tu ɛn kɔmpia di difrɛns we de pan di lɔs. if di difrεns pas 3dB, wan fayv kin gεt bεnd, krכsh, כ tεrminεshכn ishu.
Di nɔmba 4 mistek na fɔ nɔ rikodɔ di tɛst data. OPM data — transmit pawa, risiv pawa, link lɔs — na di “hɛlth rɛkɛd” fɔ wan fayv link. If dɛn nɔ rikodɔ di data afta dɛn dɔn tɛst am, we prɔblɛm dɛn de wit link tumara bambay, no we nɔ de fɔ no if “i bin fayn bifo” ɔ “i bin gɛt prɔblɛm bifo.” Di kɔrɛkt we fɔ du am na fɔ rikodɔ ɔl di data afta ɛni tɛst, we dɛn arkiv bay link nɔmba, bil wan tɛm-siris tɛst rɛkɔd.
Kɔmprɛhnsiv fayv tɛst nɔ jɔs de mɛzhɔ pawa. Wan kɔmplit fayba link akseptɛns wokflɔ fɔ inklud: transmit-sayd pawa tɛst (kɔnfɛm layt sɔs autput de insay spɛshal), risiv-sayd pawa tɛst (kɔnfɛm signal de ɔp di risiva sɛnsitiviti), link lɔs kɔlkyulɛshɔn (we dɛn pul di tu ɛn kɔmpia agens dizayn valyu dɛn), fayba ɛnd-fes inspekshɔn (klin ɛn intɛgriti), ɛn rɛd-layt kɔntinyuiti verifyeshɔn (kwik kwik wan fɔ ruul ɔut di jɔmpa fɔlt dɛn).
We yu de pik di tin dɛn we yu de yuz fɔ tɛst, di prayz nɔmɔ nɔ fɔ bi di tin we go disayd. Wan intagreted divays wit ɔl tu di OPM ɛn rɛd layt sɔs (lɛk di PK56A) na sɔntin we shɔt, i kin abop pan, ɛn i nɔ kin tek bɔku tɛm pas fɔ bay OPM ɛn rɛd layt pen sɛpret. Di kor valyu fɔ divays lɛk di PK56A nɔto mɛzhɔmɛnt akkuracy — na di abiliti fɔ kɔmplit wan ful fayba link asɛsmɛnt insay 10 minit instead fɔ kɛr tri divays, chenj tri intafɛs, ɛn luk ɔp tri tebul.
Di wan dɛn we de bay fɔ pe atɛnshɔn bak to di ditil dɛn we izi fɔ fɔgɛt insay makɛt matirial dɛn: if di divays de sɔpɔt data ɛkspɔt (fɔ intagreshɔn wit injinɛri manejmɛnt sistɛm dɛn); if fayv adapt dɛn kɔba di intafɛs tayp dɛn we dɛn de yuz na di fil; if lכng wevlεngth dεm (1625nm, fכ DW sistεm aut-כf-bεnd tεst) dεn sכpכt; ɛn if di bateri layf mit wan ful de fɔ yuz na fil. Dɛn ditil dɛn ya de sho if di divays rili yus ɔ i dɔn fɔgɛt na drɔwa. View the PV Test Instruments Collection
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