Ɔberɛfɛw da 20, afe 2022
TDR yɛ adwuma te sɛ radar no ara pɛ. Adwinnade no de nnyigyei a ɛkɔ soro ntɛmntɛm kɔ nhama no mu. Sɛ ehyia impedance discontinuity a, ahoɔden no fã bi san kɔ akyi.
TDR (Time Domain Reflectometry) yɛ adwuma te sɛ radar no ara pɛ. Adwinnade no de nnyigyei a ɛkɔ soro ntɛmntɛm kɔ nhama no mu. Sɛ ehyia impedance discontinuity (te sɛ break, short circuit, joint, anaa termination point) a, ahoɔden no fã bi san kɔ akyi. Adwinnade no susuw bere nsonsonoe a ɛda pulse transmission ne reflection sanba ntam, na sɛ wɔde ka sɛnkyerɛnne trɛw ahoɔhare a ɛwɔ medium no mu a, ebu kwan a ɛkɔ discontinuity no ho akontaa.
Ɛte sɛ nea nnyinasosɛm yi yɛ mmerɛw, nanso nneɛma atitiriw pii a ɛsakra no nya so nkɛntɛnso wɔ nneyɛe mu. Ahoɔhare a nsɛnkyerɛnne trɛw no yɛ soronko wɔ cable media ahorow mu (twisted pair taa trɛw wɔ hann ahoɔhare mmɔho 0.6 kosi 0.7). Pulse rise bere no na ɛkyerɛ spatial resolution — bere tiaa a ɛkɔ soro kyerɛ resolution a ɛkorɔn nanso ɛyɛ tiaa maximum measurable distance. Amplitude ne polarity a ɛwɔ sɛnkyerɛnne a ɛdannan no mu no betumi akyerɛ wo sɛ ebia woredi open circuit (positive reflection), short circuit (negative reflection), anaa impedance mismatch (partial reflection) ho dwuma.
Wɔ nnɛyi cable finders mu no, wɔtaa de TDR dwumadie bom ne tenten susudua. FangService's PK652 series yɛ TDR-type finder a ɛtaa ba — ɛnyɛ sɛ ɛkyerɛ wo sɛ ebia cable bi yɛ conductive nko, na mmom ɛkyerɛ wo cable tenten nyinaa ne beae pɔtee a break wɔ.
Wɔ dwumadie a ɛyɛ adwuma mu no, TDR sɔhwɛ hwehwɛ sɛ wɔtumi kɔ nhama no ano baako (wɔde abɔ adwinnadeɛ no ho), berɛ a n’awieɛ foforɔ no tebea ka nea ɛfiri susudua no mu ba. Sɛ ano foforo no abue (a enni awiei) a, adwinnade no hu open-circuit reflection na ebetumi abu cable tenten nyinaa ho akontaa. Sɛ wɔde impedance matching pa twa awiei foforo no a, wonhu reflection biara, na kwan a ɛkɔ termination point no nkutoo na wobetumi asusuw. Sɛ wɔyɛ awiei foforo no tiaa a, wohu sɛ ɔkwan tiawa bi a ɛdannan no, na wobetumi abu kwan a ɛda ntam nso ho akontaa.
TDR wɔ tumi nanso ɛnyɛ nea mfomso biara nni ho. Nkyerɛase a ɛnteɛ ho nsɛm pii ni. Nea edi kan no, sɛ abubuw pii wɔ nhama bi mu a, TDR betumi akyerɛ nea ɛbɛn no nkutoo — sɛnkyerɛnne a edi kan a ɛdannan no kata nsunsuanso a efi akyirikyiri so. Nea ɛto so abien no, sɛ ahomegye bi bɛn adwinnade no yiye (te sɛ nea ɛwɔ mita 1 mu) a, ebia adwinnade no bere a ɛwɔ beae a awu no rentumi nsiesie, na ɛbɛma nea ɛdannan no ayɛ nea wontumi nhu. Nea ɛto so abiɛsa no, mmeae a anyinam ahoɔden a ɛtwetwe nneɛma a emu yɛ den no de dede a ɛtew TDR susuw pɛpɛɛpɛ so ba.
Bio nso, TDR susuw anyinam ahoɔden sɛnkyerɛnne trɛw kwan, na ɛnyɛ honam fam tenten. Sɛ wɔbɔ nhama bi na wɔtwe fa ɔkwan bi mu a, honam fam tenten ankasa bɛyɛ kɛse asen kwan a ɛkɔ tẽẽ a TDR susuw no. Sɛ wɔrebɔ sɔhwɛ ho nsɛm ho amanneɛ a, ɛho hia sɛ wohyɛ no nsow sɛ ebia akontaabu no yɛ ‘anyinam ahoɔden tenten’ anaasɛ ‘honam fam tenten’.
Ansa na TDR reba no, na ɔkwan a wɔfa so siesie ɔhaw ahorow a ɛfa nhama a ɛpaapae ho ne: nhwehwɛmu a wɔde aniwa hu → ɔfã biara排查 → nsɛm a wɔde si ananmu ho adansedi. Saa kwan yi kɔɔ so yɛɛ adwuma yiye wɔ akwan tiaa ne nhama nketewa a wɔkan mu, nanso wɔ akwan tenten, nhama pii, ne nnwuma a wɔde asie mu no, na adwumayɛ a etu mpɔn no sua koraa.
TDR mfiridwuma ma bere a wɔde siesie ɔhaw ahorow no so tew fi ‘ nnɔnhwerew’ kosi ‘simma’. Mfiridwumayɛfo a ne ho akokwaw a ɔde PK652 ntoatoaso no di dwuma betumi ahu baabi a ahome wɔ nhama a ne tenten yɛ mita 100 mu wɔ simma kakraa bi mu, bere a atetesɛm akwan no betumi ahwehwɛ sɛ wobue nnaka pii a wɔde ka bom ne排查 ɔfã biara, na egye nnɔnhwerew pii anaa nea ɛboro saa mpo.
Nea ɛho hia kɛse no, TDR yɛ ɔkwan a ɛnyɛ nea ɛsɛe ade a wɔfa so hwehwɛ yare — enhia sɛ wotwa nhama anaasɛ wobue nkitahodi ahorow, na wɔkwati sɛ wɔbɛsɛe nhama no a ɛto so abien. Eyi ho hia titiriw wɔ nnwuma a wɔde asie a wɔawie dedaw mu.
TDR ne mfiridwuma titiriw a wɔde sɔ anyinam ahoɔden nhama hwɛ, bere a wɔ fiber optic sɔhwɛ mu no, wɔfrɛ ɔkwan a ɛte saa ara nanso ɛyɛ den kɛse OTDR (Optical Time Domain Reflectometry). OTDR de optical pulses kɔ fiber no mu na ɛhwehwɛ hann a ɛdannan no mu de kyerɛ breaks, splice losses, connector losses, ne ne nyinaa tenten.
Efi TDR so kosi OTDR so no, ntease titiriw a ɛwɔ cable sɔhwɛ mfiridwuma mu no nsakrae — abien no nyinaa de nsɛnkyerɛnne a ɛda adi di dwuma de ‘hwɛ’ nea ɛrekɔ so wɔ nhama no mu. Nea asesa ne signal carrier (electrical vs optical) ne susudua pɛpɛɛpɛ nkutoo. FangService no nhama sɔhwɛ kwan no mprempren twe adwene si anyinam ahoɔden nhama sɔhwɛ so (PK651/PK652/PK653+/PK659), de sɔhwɛ ano aduru a edi mũ ma nkitahodi ne anyinam ahoɔden nhama mfiridwuma. Bere a fiber cabling reyɛ kɛse no, OTDR-type nneɛma bɛyɛ ade titiriw a ɛbɛboa line no. View the Cable Test Instruments Collection
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Nya Quote a Wɔde Ma KwaPK651 analog/digital cable finder, PK652 finder with length measurement, PK653+ multi-range finder (100M/300M/400M), PK659 multifunction finder — four series covering the complete needs from basic continuity verification to advanced fault location. High-precision identification, up to 600M length measurement, rapid fault location — designed for installation and maintenance of network, telephone, and electrical cabling systems.
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