電阻測量方法的研究-The Research on Measuring Method of Resistance

詳細分析了1 k11- 500 Gf電阻各量程的分辨率和測量電路輸出信號范圍，并以此為依據設計了實用的電路系統。同時給出體的測量方法如下:首先判斷電阻的范圍，將放大器切換到合適的量程;放大后的電壓信號經A/D轉換送給單片機計算電阻值;根據各自量程的標準電阻值及其測量值之差進行動態校正。該方法消除了噪聲對測量精度的影響。測試結果表明:在全量程范圍內，最小測量誤差為0.03%，最大測量誤差為0.8%。
關鍵詞:電阻測量 多量程 測量 分辨率 動態校正
Abstract;T her esolutiona ndo utputsi gnalof ea chr angefr om1 W to5 00(;nresistancea rea nalyzed.T husth ep racticalci rcuitsy stemi sd esigned.
The concrete measuring method is given as folows: Firstly, the unknown resistance range is judged approximately; then, switch the
amplifier to an appropriate measurement range; the voltage signal output from amplifier is transmitted to single chip computer through A/D converter,
the resistance value is calculated場the computer. Dynamic adjustment is conducted on the difference between the standard resistance of
each range and the measurement. This method eliminates the noise effect on precision of measurement. Test results in ful measurement rangeshow
thatth em inimum measuremente rrori s0 .03%，them aximum erroris 0 .8% .
Keywords:M easurementof re sistance Measurementw ithm ultipler anges Resolution Dynamica djustmen