毫欧电阻的温度影响精度测试分析

毫欧电阻的温度影响精度测试分析取样电阻的温度影响精度测试分析分流器的精确测试分析 分流器是测量直流电流用的，根据直流电流通过阻值很小的电阻时在电阻两端产生电压的原理制成。在实际应用中，要测量一个很大的电流值，没有大量程的电流表测量其电流，分流器就可以产生作用了。分流器两端产生毫伏级直流电压信号，使并接在该分流器两端的计量表显示电压值，分流器的电阻时定值，通过计算得到实际测量的电流值。但实际生产上，分流器并不是那么精确地电阻值，而且在不同温度条件下，其阻值也相应的发生微小的变化。那么怎么选择精确地分流器呢？也只能通过测试来证明所买到的分流器是否准确了。下面是采用DF-80A型二极管正向压降测试仪来测试几种分流器的阻值，下图是本测试所选用的几款分流器和分流器的参数。 （1）0.01欧姆采样电阻 （2）0.01欧采样电阻 （3）0.01欧采样电阻 （1）参数表型号/规格2512-0.01R 1％品牌/商标VIKING环保类别无铅环保型功率分类中功率（1W~5W）精度类别高精度型（=1％）外形结构特征片状型（2）参数表型号/规格WSL2512R0100FEA品牌/商标Vishay/Dale (VA)环保类别无铅环保型功率分类中功率1W精度类别高精度型（=1％）外形结构特征片状型（3）参数表型号/规格PBV R010 0.5％品牌/商标RHOPOINT环保类别-----------------功率分类中功率3W/10W精度类别高精度型（=0.5％）外形结构特征直插片状型 测试连接方法在不同温度下，测试分流器的阻值稳定性。如下图连接图所示，用电脑连接DF-80A，DF-80A连接标准分流器两端，用TEC-10B控制分流器温度。温度设定为常温28.4℃，45℃。 测试软件截图 测试曲线 2512-0.01R 1％的连续测试曲线 WSL2512R0100FEA的连续测试曲线\ PBV R010 0.5％的连续测试曲线测试结果测试的室内温度为28.4℃下，测试2512-0.01R 1％的分流器的VI数据表格电流(A) - VCE-IC曲线电压(V) - VCE-IC曲线R=U/I(欧)00010.0080.00820.0180.0093.10.030.0096774194.10.0390.0095121955.20.0470.0090384626.20.0590.0095161297.30.0740.0101369868.30.0790.0095180729.40.0860.00914893610.40.0980.00942307711.50.1140.00991304312.50.120.009613.60.1350.00992647114.60.1420.00972602715.70.1560.00993630616.70.1670.0117.80.1750.00983146118.80.1850.00984042619.90.1940.00974874420.90.2070.009904306220.2190.009954545得到的电阻值计算平均值为0.009588欧姆。 测试的温度为45℃下，测试2512-0.01R 1％的分流器的VI数据表格电流(A) - VCE-IC曲线电压(V) - VCE-IC曲线R=U/I(欧)00010.0080.00820.0180.0093.10.0250.0080645164.10.0370.009024395.20.0520.016.20.060.0096774197.30.070.0095890418.30.0780.009397599.40.0940.0110.40.10.00961538511.50.110.00956521712.50.1220.0097613.60.1340.00985294114.60.1420.00972602715.70.1540.00980891816.70.1640.00982035917.80.1740.00977528118.80.1840.00978723419.90.190.00954773920.90.20.009569378220.2090.0095得到的电阻值计算平均值为0.00948欧姆。 测试的室内温度为28.4℃下，测试WSL2512R0100FEA的分流器的VI数据表格电流(A) - VCE-IC曲线电压(V) - VCE-IC曲线R=U/I(欧)00010.0050.00520.020.013.10.0270.0087096774.10.0380.0092682935.20.0440.0084615386.20.0640.0103225817.30.080.0109589048.30.0860.0103614469.40.0910.00968085110.40.1020.00980769211.50.1080.00939130412.50.1230.0098413.60.1310.00963235314.60.1440.00986301415.70.150.0095541416.70.1630.00976047917.80.1730.00971910118.80.1840.00978723419.90.1950.00979899520.90.2040.009760766220.2120.009636364得到的电阻值计算平均值为0.009491欧姆。 测试的温度为45℃下，测试WSL2512R0100FEA的分流器的VI数据表格电流(A) - VCE-IC曲线电压(V) - VCE-IC曲线R=U/I(欧)00.003010.0080.00820.0180.0093.10.0270.0087096774.10.0360.0087804885.20.0470.0090384626.20.0620.017.30.0690.0094520558.30.0860.0103614469.40.0910.00968085110.40.1050.01009615411.50.1110.00965217412.50.1210.0096813.60.1350.00992647114.60.1470.01006849315.70.1560...993630616.70.1650.0098802417.80.1780.0118.80.1980.01053191519.90.1990.0120.90.2070.009904306220.220.01得到的电阻值计算平均值为0.009652欧姆。 测试的室内温度为28.4℃下，测试PBV R010 0.5％的分流器的VI数据表格电流(A) - VCE-IC曲线电压(V) - VCE-IC曲线R=U/I(欧)00010.0080.00820.0160.0083.10.0310.014.10.0420.0102445.20.0520.016.20.060.0096777.30.0750.0102748.30.0850.0102419.40.0970.01031910.40.1040.0111.50.110.00956512.50.1210.0096813.60.140.01029414.60.1460.0115.70.1590.01012716.70.1720.01029917.80.180.01011218.80.190.01010619.90.2020.01015120.90.2120.010144220.2180.009909得到的电阻值计算平均值为0.01006欧姆。 测试的温度为45℃下，测试PBV R010 0.5％的分流器的VI数据表格电流(A) - VCE-IC曲线电压(V) - VCE-IC曲线R=U/I(欧)10.0080.00820.0180.0093.10.0230.0074194.10.040.0097565.20.0450.0086546.20.0590.0095167.30.070.0095898.30.0830.019.40.0940.0110.40.1050.01009611.50.1180.01026112.50.1260.0100813.60.1370.01007414.60.1520.01041115.70.1640.01044616.70.1710.0102417.80.1830.01028118.80.190.01010619.90.210.01055320.90.2150.010287220.2250.010227得到的电阻值计算平均值为0.010032欧姆。 测试结果分析温度型号测试阻值误差型号测试阻值误差28.4℃2512-0.01R 1％0.0095884.12％WSL2512R0100FEA0.0094915.09％45℃0.009485.2％0.0096523.48％28.4℃PBV R010 0.5％0.010060.6％ 45℃0.0100320.32％ 参照芯片手册上所述，这2种贴片的分流器（贴片采样电阻）都未到1％的精度，但随机抽取测试的PBV R010 0.5％的高精密检流电阻性能好，能达到芯片手册上说明的0.5％的精度。毫欧电阻的温度影响精度测试分析取样电阻的温度影响精度测试分析分流器的精确测试分析 分流器是测量直流电流用的，根据直流电流通过阻值很小的电阻时在电阻两端产生电压的原理制成。在实际应用中，要测量一个很大的电流值，没有大量程的电流表测量其电流，分流器就可以产生作用了。分流器两端产生毫伏级直流电压信号，使并接在该分流器两端的计量表显示电压值，分流器的电阻时定值，通过计算得到实际测量的电流值。但实际生产上，分流器并不是那么精确地电阻值，而且在不同温度条件下，其阻值也相应的发生微小的变化。那么怎么选择精确地分流器呢？也只能通过测试来证明所买到的分流器是否准确了。下面是采用DF-80A型二极管正向压降测试仪来测试几种分流器的阻值，下图是本测试所选用的几款分流器和分流器的参数。 （1）0.01欧姆采样电阻 （2）0.01欧采样电阻 （3）0.01欧采样电阻 （1）参数表型号/规格2512-0.01R 1％品牌/商标VIKING环保类别无铅环保型功率分类中功率（1W~5W）精度类别高精度型（=1％）外形结构特征片状型（2）参数表型号/规格WSL2512R0100FEA品牌/商标Vishay/Dale (VA)环保类别无铅环保型功率分类中功率1W精度类别高精度型（=1％）外形结构特征片状型（3）参数表型号/规格PBV R010 0.5％品牌/商标RHOPOINT环保类别-----------------功率分类中功率3W/10W精度类别高精度型（=0.5％）外形结构特征直插片状型 测试连接方法在不同温度下，测试分流器的阻值稳定性。如下图连接图所示，用电脑连接DF-80A，DF-80A连接标准分流器两端，用TEC-10B控制分流器温度。温度设定为常温28.4℃，45℃。 测试软件截图 测试曲线 2512-0.01R 1％的连续测试曲线 WSL2512R0100FEA的连续测试曲线\ PBV R010 0.5％的连续测试曲线测试结果测试的室内温度为28.4℃下，测试2512-0.01R 1％的分流器的VI数据表格电流(A) - VCE-IC曲线电压(V) - VCE-IC曲线R=U/I(欧)00010.0080.00820.0180.0093.10.030.0096774194.10.0390.0095121955.20.0470.0090384626.20.0590.0095161297.30.0740.0101369868.30.0790.0095180729.40.0860.00914893610.40.0980.00942307711.50.1140.00991304312.50.120.009613.60.1350.00992647114.60.1420.00972602715.70.1560.00993630616.70.1670.0117.80.1750.00983146118.80.1850.00984042619.90.1940.00974874420.90.2070.009904306220.2190.009954545得到的电阻值计算平均值为0.009588欧姆。 测试的温度为45℃下，测试2512-0.01R 1％的分流器的VI数据表格电流(A) - VCE-IC曲线电压(V) - VCE-IC曲线R=U/I(欧)00010.0080.00820.0180.0093.10.0250.0080645164.10.0370.009024395.20.0520.016.20.060.0096774197.30.070.0095890418.30.0780.009397599.40.0940.0110.40.10.00961538511.50.110.00956521712.50.1220.0097613.60.1340.00985294114.60.1420.00972602715.70.1540.00980891816.70.1640.00982035917.80.1740.00977528118.80.1840.00978723419.90.190.00954773920.90.20.009569378220.2090.0095得到的电阻值计算平均值为0.00948欧姆。 测试的室内温度为28.4℃下，测试WSL2512R0100FEA的分流器的VI数据表格电流(A) - VCE-IC曲线电压(V) - VCE-IC曲线R=U/I(欧)00010.0050.00520.020.013.10.0270.0087096774.10.0380.0092682935.20.0440.0084615386.20.0640.0103225817.30.080.0109589048.30.0860.0103614469.40.0910.00968085110.40.1020.00980769211.50.1080.00939130412.50.1230.0098413.60.1310.00963235314.60.1440.00986301415.70.150.0095541416.70.1630.00976047917.80.1730.00971910118.80.1840.00978723419.90.1950.00979899520.90.2040.009760766220.2120.009636364得到的电阻值计算平均值为0.009491欧姆。 测试的温度为45℃下，测试WSL2512R0100FEA的分流器的VI数据表格电流(A) - VCE-IC曲线电压(V) - VCE-IC曲线R=U/I(欧)00.003010.0080.00820.0180.0093.10.0270.0087096774.10.0360.0087804885.20.0470.0090384626.20.0620.017.30.0690.0094520558.30.0860.0103614469.40.0910.00968085110.40.1050.01009615411.50.1110.00965217412.50.1210.0096813.60.1350.00992647114.60.1470.01006849315.70.1560...993630616.70.1650.0098802417.80.1780.0118.80.1980.01053191519.90.1990.0120.90.2070.009904306220.220.01得到的电阻值计算平均值为0.009652欧姆。 测试的室内温度为28.4℃下，测试PBV R010 0.5％的分流器的VI数据表格电流(A) - VCE-IC曲线电压(V) - VCE-IC曲线R=U/I(欧)00010.0080.00820.0160.0083.10.0310.014.10.0420.0102445.20.0520.016.20.060.0096777.30.0750.0102748.30.0850.0102419.40.0970.01031910.40.1040.0111.50.110.00956512.50.1210.0096813.60.140.01029414.60.1460.0115.70.1590.01012716.70.1720.01029917.80.180.01011218.80.190.01010619.90.2020.01015120.90.2120.010144220.2180.009909得到的电阻值计算平均值为0.01006欧姆。 测试的温度为45℃下，测试PBV R010 0.5％的分流器的VI数据表格电流(A) - VCE-IC曲线电压(V) - VCE-IC曲线R=U/I(欧)10.0080.00820.0180.0093.10.0230.0074194.10.040.0097565.20.0450.0086546.20.0590.0095167.30.070.0095898.30.0830.019.40.0940.0110.40.1050.01009611.50.1180.01026112.50.1260.0100813.60.1370.01007414.60.1520.01041115.70.1640.01044616.70.1710.0102417.80.1830.01028118.80.190.01010619.90.210.01055320.90.2150.010287220.2250.010227得到的电阻值计算平均值为0.010032欧姆。 测试结果分析温度型号测试阻值误差型号测试阻值误差28.4℃2512-0.01R 1％0.0095884.12％WSL2512R0100FEA0.0094915.09％45℃0.009485.2％0.0096523.48％28.4℃PBV R010 0.5％0.010060.6％ 45℃0.0100320.32％ 参照芯片手册上所述，这2种贴片的分流器（贴片采样电阻）都未到1％的精度，但随机抽取测试的PBV R010 0.5％的高精密检流电阻性能好，能达到芯片手册上说明的0.5％的精度。