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1、一般同行在维修过程中是以实测阻值和资料对比，或者用手握感温头，用表测其阻 值是否有变化来判断其好坏。这些可以大概判断出传感器的好坏。不过有些传感器,在用加温法时，阻值也是变化的，但其阻值已经严重偏离正常值. 还有些机型不熟悉，无法知其确定的阻值。小编观看许多空调的电路图发现,空调的传感器电路基本相似，都是以电阻分压形 式提供信号电压给CPU进行比较计算，以此判断外界温度的高低。CPU向感温头 供电一般是+ 5V，经过感温头电阻变化分压后，输入CPU的电压一般在+ 2.OV3.OV之间，这也是传感器两头的电压。如果测出的电压严重偏离，可判断传感器已经损坏.1、因为人的体温恒定，所以用手握感温头一
2、时，它的在路电压是一定的（约为2.17V）。2、感温头的型号值就是它在25C时的电阻值,通常是5K,10K,15K,20K,5OK这几 种，一般都是负温度系数的，即温度越高，电阻值反而越小。3、拔掉感温头的插头，在线路测量其座子的两个插针的电阻，所得的阻值基本就 是感温头在25C时的型号值（经实际检验此方法不准确）。如果是8K左右的电阻，那传感器感温头的型号值一般是10K，如果是4.7K电阻, 则是5K感温头，以此类推。（但有部分大型空调，变频空调外机控制板温度传感器的阻值是下偏置电阻的3 倍，即以上述方法测出的阻值乘以3,就是传感器在25C时的阻值。）4、不同类型感温头的阻值不同，那如何判别
3、感温头的好坏呢？很简单，就是在线 测量它的电压，25度时正常的电压一般是在+ 2 + 2.5V之间.5、一般来说内机管温和室温阻值是一样的。F面给大家附上5K,10K,15K,2OK,50K的阻值电压表，供大家参考。(1) 5K温度阻值电压值温度阻值电压值CKQ4.3KCKQ4.3K0161.0200.130052158.7660.340911153.0000.136682256.1890.355442145.4200.143602353 7380.370453138.2600.150812451.4080.385944131 .5000.158322549.1910.401945126.17
4、00.164792647.0820.418436119.0800.174262745.0740.435457113 3700.182712843.1630.452988107.9600.191522941 3130.471369102.8500.200653039.6100.489641098.0060.210153137.9580.508781193.4200.220023236.3840.528461289.0750.230253334.8830.548711384.9560.240883433.4530.569491481.0520.251903532.0880.590851577 34
5、90.263323630.7870.612761673.8960.274953729.5440.635271770.5030.287423828.3590.658321867 3380.300123927.2270.681961964.3330.313264026.1470.706152061.4780.32686(2)10K温度阻值电压值温度阻值电压值CKQ81KCKQ8.1K030.3431.053502111.3272.03384128.9281.093762211.3272.08472227.5871.134862310.8642.1356326.3171.176742410.4222
6、.1865425.1121.219432510.002.23756523.9701.26286269.5982.28842622.8861.30704279.2142.33916721.8571.35193288.8472.3897820.8811.3974298.4982.4401919.9541.44364308.1632.49021019.0731.49045317.8402.540141118.2361.53781327.5392.589691217.4401.58574337.2472.63891316.6841.63411346.9692.68771415.9651.6829435
7、6.7022.736111515.2811.73217366.4472.784071614.6301.78178376.2032.831551714.0101.83175385.9702.878541813.4201.88197395.7462.924991912.8581.93243405.5322.970882012.3231.98305415.3283.01618(3)15K温度阻值电压值温度阻值电压值CKQ15KCKQ15K049.0201.17152117.9302.2776146.8001.21362217.1402.3335244.3101.26452316.3902.38933
8、42.1401.31262415.6802.4446440.0901.36142515.0002.5000538.1501.41112614.3602.5545636.3201.46142713.7402.6096734.5801.51272813.1602.6634832.9401.56452912.6002.7174931.3801.61713012.0702.77061039.9001.67043111.5702.82271128.5101.72373211.0902.87471227.1801.77813310.6302.92631325.9201.83283410.2002.9762
9、1424.7301.8877359.7793.02681523.6001.9430369.3823.07601622.5301.9984379.0033.12461721.5102.0542388.6423.17231820.5402.1103398.2973.21931919.6302.1658407.9673.26562018.7502.2222(4)20K温度阻值电压值温度阻值电压值CKQ20KCKQ20K065.371.17152123.902.2776162.131.21362222.852.3335259.081.26452321.852.3893356.191.31262420.
10、902.4446453.461.36142520.002.5000550.871.41112619.142.5545648.421.46142718.322.6096746.111.51272817.552.6634843.921.56452916.802.7174941.841.61713016.102.77061039.871.67043115.432.82271138.011.72373214.792.87471236.241.77813314.182.92631334.571.83283413.592.97621432.981.88773513.043.02681531.471.943
11、03612.513.07601630.041.99843712.003.12461728.682.05423811.523.17231827.392.11033911.063.21931926.172.16584010.623.26562025.012.2222（5）50K温度阻值电压值温度阻值电压值CKQ4.3KCKQ4.3K0161.0200.130052158.7660.340911153.0000.136682256.1890.355442145.4200.143602353.7380.370453138.2600.150812451.4080.385944131.5000.158322549.1910.401945126.1700.164792647.0820.418436119.0800.174262745.0740.435457113.3700.182712843.1630.452988107.9600.191522941.3130.471369102.8500.200653039.6100.489641098.0060.210153137.9580.508781193.4200.220023236.3840.528461289.0750.230253334.8830.548711384.9560.240883433.4530.56
