描述
為了安全起見,通常二次儀表和信號源殼體都接大地,以保持零電位。信號源電路以及儀表系統(tǒng)也需要穩(wěn)定接地,如所示,兩點(diǎn)接地,由于存在地電位差,產(chǎn)生共模干擾。因此,系統(tǒng)接地通常采用在信號源側(cè)或二次儀表回路單點(diǎn)接地,如所示。為了提高儀表抗干擾能力,儀表生產(chǎn)廠家一般都把放大器浮地,以切斷共模干擾的泄漏途徑,使干擾無法進(jìn)入,另外,事實上信號源側(cè)對地也不可能絕緣,采用4a)的接地方式不可能徹底消除地電位差引入的干擾,因此為了提高二次儀表的抗干擾能力,4b)所示的接地方法是經(jīng)常采用的。
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