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為(wei)壓力(li)變(bian)(bian)送器等需要(yao)現場供電(dian)(dian)(dian)(dian)的(de)一(yi)次儀(yi)表提供電(dian)(dian)(dian)(dian)源回路(lu)(lu)，同時在線測(ce)量(liang)該一(yi)次儀(yi)表輸出(chu)(chu)的(de)電(dian)(dian)(dian)(dian)流(liu)信號，并經運算、干擾(rao)抑制等處理后，變(bian)(bian)送輸出(chu)(chu)隔(ge)離的(de)單路(lu)(lu)或(huo)雙路(lu)(lu)電(dian)(dian)(dian)(dian)流(liu)或(huo)電(dian)(dian)(dian)(dian)壓信號，并提高輸入、輸出(chu)(chu)、電(dian)(dian)(dian)(dian)源之(zhi)間的(de)電(dian)(dian)(dian)(dian)氣(qi)隔(ge)離性能。