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INA129输入阻抗问题

Other Parts Discussed in Thread: INA129

按照图连接,进行INA129的输入阻抗测试,计算输入阻抗测试结果,计算结果只有0.65M欧姆,而以前也是相同电路,相同测试方法,测试结果可以达到5M欧姆以上,在此想问,影响输入阻抗的因素有哪些?该如何去提高此电路的输入阻抗?