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求教!OPA336使用问题

Other Parts Discussed in Thread: OPA336

光电流探测电路如图。

现在的问题是,接上电后没有光照时,用数字源表在输出端居然测出有约-40mV的输出,但是用示波器测量时却没有这样的一个输出。

可以排除是电源或者光电二极管的原因。请问是否测量的方法不正确?如何消除这种现象?多谢!