Question

pt100测得电阻为86欧姆，对应的温度是-30度，我是常温测量的，有谁能帮忙解释一下

Answer 1

pt100热电阻的测量范围为-200---600度，当阻值为86欧姆相对应该的温度为-36度左右，若是你是用来常温测量，而所测介质没有-36度而阻值又是86欧姆的话，那么告诉你一个不幸的消息，你的热电阻可能坏了。
pt100分度表
℃ 0 1 2 3 4 5 6 7 8 9 10 ℃
-100 60.25 59.85 59.44 59.04 58.63 58.22 57.82 57.41 57.00 56.60 56.19 -100.00
-90 64.30 63.90 63.49 63.09 62.68 62.28 61.87 61.47 61.06 60.66 60.25 -90.00
-80 68.33 67.92 67.52 67.12 66.72 66.31 65.91 65.51 65.11 64.70 64.30 -80.00
-70 72.33 71.93 71.53 71.13 70.73 70.33 69.93 69.53 69.13 68.73 68.33 -70.00
-60 76.33 75.93 75.53 75.13 74.73 74.33 73.93 73.53 73.13 72.73 72.33 -60.00
-50 80.31 79.91 79.51 79.11 78.72 78.32 77.92 77.52 77.13 76.73 76.33 -50.00
-40 84.27 83.88 83.48 83.08 82.69 82.29 81.89 81.50 81.10 80.70 80.31 -40.00
-30 88.22 87.83 87.43 87.04 86.64 86.25 85.85 85.46 85.06 84.67 84.27 -30.00
-20 92.16 91.77 91.37 90.93 90.59 90.19 89.80 89.40 89.01 88.62 88.22 -20.00
-10 96.09 95.69 95.30 94.91 94.52 94.12 93.73 93.34 92.95 92.55 92.16 -10.00
0 100.00 100.39 100.78 101.17 101.56 101.95 102.34 102.73 103.12 103.51 103.90 0.00
10 103.90 104.29 104.68 105.07 105.46 105.85 106.24 106.63 107.02 107.40 107.79 10.00
20 107.79 108.18 108.75 108.96 109.35 109.73 110.12 110.51 110.90 111.28 111.67 20.00
30 111.67 112.06 112.45 112.83 113.22 113.61 114.99 114.38 114.77 115.15 115.54 30.00
40 115.54 115.93 116.31 116.70 117.08 117.47 117.85 118.24 118.62 119.01 119.40 40.00
50 119.40 119.78 120.16 120.55 120.93 121.32 121.70 122.09 122.47 122.86 123.24 50.00
60 123.24 123.62 124.01 124.39 124.77 125.16 125.54 125.92 126.31 126.69 127.07 60.00
70 127.07 127.45 127.84 128.22 128.60 128.98 129.37 129.75 130.13 130.51 130.89 70.00
80 130.89 131.27 131.66 132.04 132.42 132.80 133.18 133.56 133.94 134.32 134.70 80.00
90 134.70 135.08 135.46 135.84 136.22 136.60 136.98 137.36 137.74 138.12 138.50 90.00
100 138.50 138.88 139.26 139.64 140.02 140.39 140.77 141.15 141.53 141.91 142.29 100.00
110 142.29 142.66 143.04 143.42 143.80 144.17 144.55 144.93 145.31 145.68 146.06 110.00
120 146.06 146.44 146.81 147.19 147.57 147.94 148.32 148.70 149.07 149.45 149.82 120.00
130 149.82 150.20 150.57 150.95 151.33 151.70 152.08 152.45 152.83 153.20 153.58 130.00
140 153.58 153.95 154.32 154.70 155.07 155.45 155.82 156.19 156.57 156.94 157.31 140.00
150 157.31 157.69 158.06 158.43 158.81 159.18 159.55 159.93 160.30 160.67 161.04 150.00

Answer 2

估计你是连在电路里边测的吧，由于整个电路串并联的影响，你测得的值可能并不是传感器的真实值

Answer 3

用万用表测电阻的时候将电路断电，有必要的话将电阻从电路中断开测量，还有看看你的万用表是不是电量不够了