Tá go leor fachtóirí ann a fhéadann léamha míchruinn a chur ar fhriotaíocht talún i dtástáil cosanta tintrí . In achoimre, is iondúil go mbíonn naoi gcúis leis seo .
Firstly, since the grounding resistance tester tests the grounding resistance of the grounding body by emitting and receiving current through iron bars, mutual interference and errors will occur when the distance between two iron bars and between two bars and the grounding body is too close. Therefore, during measurement. The grounding body, voltage pole, and current pole are arranged in sequence, with three points in a líne dhíreach agus 20 méadar seachas a chéile {.
Ar an dara dul síos, ba chóir go mbeadh doimhneacht na slaite iarainn a chuirtear isteach sa talamh níos mó ná 1/4 de fhad na slaite iarainn, ar shlí eile, go dtarlóidh earráidí tástála . Dá bhrí sin . Le linn tástála, ba cheart an prás iarainn a dhruileáil chomh domhain agus is féidir .
Ar an tríú dul síos, nuair a bhíonn an leictreoid talún a tástáladh sa riocht "talamh coiteann", mar gheall ar dhroch -insliú nó ciorcad gearr an trealaimh, is féidir leis an bhfeiste talún voltas talún áirithe a ghiniúint, a d'fhéadfadh léamha éagobhsaí a chruthú le linn tomhais . Ag an am seo, ba cheart an chumhacht a ghearradh ar thástáil, nó dícheangail i gceantair a sheachaint chun na cártaí a sheachaint chun an t -athrú ar an talamh a sheachaint chun an volta a sheachaint}}}}}}}}}}}}},
Ceathrú, droch -theagmháil . Nuair a bhíonn an réad atá á thástáil rusts nó na sosanna líne braite, feiniméan de dhícheangal uaineach nó friotaíocht ard le linn braite . Ag an bpointe seo, ba cheart meirgiú a bhaint den chéad uair. nach féidir leis an bhfriotaíocht a bhaint amach, má tá sé in ann an t -iomaíochas a úsáid chun an t -ilimealtóir a sheiceáil chun an t -ilmheán a sheiceáil chun an t -alt a sheiceáil chun an t -alt a sheiceáil chun an t -alt a sheiceáil chun an t -alt a sheiceáil chun an t -an t -alt a sheiceáil an t -alt seo chun an t -alt a sheiceáil an t -am ar bith nach féidir leis an tsreang a bheith ann an t -aon rud a dhéanamh nach féidir leis a bheith in ann an t -am a bheith ann {{{{} {{} a { líne .
An cúigiú, agus foirgnimh ard-ardú á iniúchadh, is féidir le sreanga atá ró-fhada nó ró-tiubh a mhéadú friotaíocht líne agus voltas spreagtha, ag cruthú earráidí tomhais . ag an am seo, ba cheart sreanga le frithsheasmhacht réasúnta íseal a úsáid chun earráidí tomhais a íoslaghdú a oiread agus is féidir .}
Sixth, when there are materials such as soil or sand in the measured area, measurement errors may occur due to the different electrical resistivity of the upper and lower layers of soil. At this time, deep iron drills should be used to ensure full contact with the soil under the cushion layer or to avoid the cushion layer, in order to reduce measurement errors.
Seventh, when the grounding device and metal objects such as pipelines being tested are buried underground in a complex manner, it may change the direction of the current at each pole of the measuring instrument, causing poor or unstable measurements. At this point, it is necessary to first understand the layout of the grounding body and metal pipeline, and select a relatively less affected area for measurement.
Eighth, inaccurate measurements may be caused by the existence of potential differences or strong magnetic fields on the surface. At this time, it is advisable to stay as far away as possible from places with large potential differences or strong magnetic fields. If unavoidable, the detection line should be relatively shortened to reduce measurement errors.
Is féidir leis an naoú, mainneachtain oibriú de réir na dtreoracha, mainneachtain an ionstraim a dheisiú ar bhealach tráthúil, ionstraim mhíchruinn nó easpa aitheantais fhadtéarmach earráidí tomhais .