Since the input bias current at PGI has a maximum value of 50nA, R3 and R4 can be large to minimize input loading with no significant accuracy loss. Choose R4 in the 100k½ to 270k½ range and calculate R3 using the above formula. For 1% error, the current through R3 should be at least 100 times PGI’s bias current.
各位大虾，图请见附件，此段英文表面意思清楚，但是不理解电阻过大或者过小以及偏置电流对测量误差会产生影响。 |
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