电桥采集电路如上，VCC2_5v 是5V 不是2.5V ， 单电源供电
|
|
电阻值 |
理论差分电压值 |
实际测量值 |
10倍放大之后TLC1078 |
10倍 OPA2330 |
|
|
100 |
0mv |
0mv |
|
1mv |
|
|
101 |
2mv
|
1.8mv/1.9mv |
28.8mv |
19.2mv |
|
|
102 |
4mv |
3.9mv |
48.8 |
39.2mv |
|
|
103 |
6mv |
5.9mv/6.0mv |
69.0 |
61mv |
|
|
104 |
8mv |
8.mv |
89.4 |
81.5 |
|
|
105 |
10mv |
10.0mv |
109.6 |
101.7
|
|
|
106 |
12.3mv |
12.1mv |
129.7 |
121.8 |
|
|
107 |
|
14.1mv |
149.7 |
141.9
|
|
|
108 |
|
16.1mv |
169.7 |
162.0 |
|
|
109 |
|
18.1mv |
189.6 |
181.6 |
|
|
110 |
|
20.2mv |
209.5 |
201.4 |
|
|
111 |
|
22.2mv |
229.5 |
221.4 |
|
|
112 |
|
24.2mv |
249.3 |
241.5 |
|
|
113 |
|
26.2mv |
269.1 |
261.4 |
|
|
114 |
|
28.2mv |
288.9 |
280.8 |
|
|
115 |
|
30.2mv |
308.6 |
301.2 |
|
|
116 |
|
32.2mv |
328.3 |
320.7 |
|
|
117 |
|
34.2mv |
|
340.5 |
|
|
118 |
|
36.2mv |
|
360.1 |
|
|
119 |
|
38.2mv |
|
379.8 |
|
|
120 |
|
40.2mv |
407.0/406.7 |
399.4 |
因为TLC1078ID的封装和OPA2330的封装一样，当TLC1078ID 不准的时候 我就采用了OPA2330 ，TLC1078ID单路采集准确的，但是我多路采集就不准确了。
