Unverified85% confidenceFactTime unknown
数显万用表精度以'位数'和'量程'衡量，家用检测选3位半（3999字）够用，CAT III 600V以上安全等级更适合入户电路测量
1
Sources
85%
Confidence
Long-term
Relevance
-
First Seen
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Unverified万用表精度看位数：三位半（3½）分辨率约0.1V够家用，四位半（4½）用于精密电子维修；家庭电工排查买真有效值（True RMS）三位半即可，非TRMS表测变频/调光电路误差大78% similarUnverified测量精度等级看有功电能计量准确度，家用监测选1级（误差±1%）足够；若需用于分摊电费或商业结算，应选0.5级或符合IEC 62053认证的产品74% similarUnverified计量精度选1级（误差±1%）足够家用与自用监测；0.5S级（±0.5%）仅在需要精确分时结算或大功率商业计费时才有意义，价格显著更高72% similarUnverified计量精度按等级划分，1级表误差±1%、0.5S级误差±0.5%，家庭分项计量选1级足够，需精确监测分时电价或光伏并网结算建议选0.5S级71% similarUnverified数据采集精度选1级（±1%）足够家用计费参考，若用于光伏发电结算或分时电价套利分析需选0.5级（±0.5%）计量精度71% similar
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