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c.對于有功功率變送器，除另有標(biāo)志外，cos 的標(biāo)稱使用范圍極限：
感性功率因數(shù)(電流滯后) 1≥cos≥0
容性功率因數(shù)(電流超前) 1≥sin≥0
d.無功功率變送器，除另有標(biāo)志外，sin的標(biāo)稱使用范圍極限：
感性無功因數(shù)(電流滯后) 1≥sin≥0
容性無功因數(shù)(電流超前) 1≥sin≥0。
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