四线制PT100上的电流电压有多大？

四线制的RTD卡的I+ I—端子给PT100提供恒流，电流是多大？这个电流就是PT100上的电流？

西门子RTD 热电阻输入模块 温度/毫伏对照表                                       (mv)
（℃） 0       1       2        3        4       5         6        7       8         9
0 57.00 57.22 57.44 57.67 57.89 58.11 58.33 58.56 58.78 59.00
10 59.22 59.45 59.67 59.89 60.11 60.33 60.56 60.78 61.00 61.22
20 61.44 61.66 61.88 62.11 62.33 62.55 62.77 63.00 63.21 63.43
30 63.65 63.87 64.10 64.31 64.54 64.76 64.97 65.20 65.42 65.64
40 65.86 66.08 66.30 66.52 66.74 66.96 67.17 67.40 67.61 67.84
50 68.06 68.27 68.49 68.71 68.93 69.15 69.37 69.59 69.81 70.03
60 70.25 70.46 70.69 70.90 71.12 71.34 71.56 71.77 72.00 72.21
70 72.43 72.65 72.87 73.09 73.30 73.52 73.74 73.96 74.17 74.39
80 74.61 74.82 75.05 75.26 75.48 75.70 75.91 76.13 76.35 76.56
90 76.78 77.00 77.21 77.43 77.65 77.86 78.08 78.30 78.51 78.73
100 78.95 79.16 79.38 79.59 79.81 80.02 80.24 80.46 80.67 80.89
110 81.11 81.32 81.53 81.75 81.97 82.18 82.39 82.61 82.83 83.04
120 83.25 83.47 83.68 83.90 84.11 84.33 84.54 84.76 84.97 85.19
130 85.40 85.61 85.82 86.04 86.26 86.47 86.69 86.90 87.11 87.32
140 87.54 87.75 87.96 88.18 88.39 88.61 88.82 89.03 89.24 89.46
150 89.67 89.88 90.09 90.31 90.52 90.73 90.94 91.16 91.37 91.58
160 91.79 92.01 92.22 92.43 92.64 92.85 93.06 93.28 93.49 93.70 　
170 93.91 94.12 94.34 94.55 94.76 94.97 95.18 95.39 95.60 95.81
180 96.02 96.23 96.44 96.65 96.87 97.08 97.29 97.50 97.71 97.92
190 98.13 98.34 98.55 98.76 98.97 99.18 99.39 99.60 99.81 100.02
200 100.23 100.44 100.64 100.86 101.07 101.28 101.88 101.69 101.90 102.11
210 102.32 102.53 102.74 102.95 103.15 103.36 103.57 103.78 103.99 104.20
220 104.41 104.61 104.82 105.03 105.24 105.44 105.66 105.86 106.07 106.28
230 106.49 106.69 106.90 107.11 107.31 107.52 107.73 107.94 108.14 108.35
240 108.56 108.76 108.97 109.18 109.38 109.59 109.80 110.00 110.21 110.41
250 110.62 110.83 111.04 111.24 111.45 111.65 111.86 112.06 112.27 112.48
260 112.68 112.89 113.09 113.30 113.50 113.71 113.91 114.12 114.32 114.53
270 114.74 114.94 115.15 115.35 115.55 115.76 115.96 116.17 116.37 116.58
280 116.78 116.98 117.19 117.39 117.60 117.80 118.00 118.21 118.41 118.62
290 118.82 119.02 119.23 119.43 119.63 119.84 120.04 120.24 120.45 120.65
300 120.85 121.05 121.26 121.46 121.66 121.87 122.07 122.27 122.47 122.68

看不明白，是１ma？

大约是０.5mA电压不超过1V

你给的西门子RTD模块是四线制的吗?如果是二线制也是这么大电流?