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[问答] 直流稳定时间值是多少?
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在哪里可以找到有关用户手册万用表设备(34461A型号)中DC稳定时间的信息,这个时间的值是多少?
当我们将2个万用表探头稳定在一起时,即使2分钟后测量电压也不固定(如下图所示)。
因为我们要测试一个器件测量精度对我们来说如此重要(大约微伏),这个器件也有自己的稳定时间,当我们用万用表测试时,这两个稳定时间的碰撞导致我们不能
真实地衡量并影响我们的结果。
我们现在该怎么办?

以上来自于谷歌翻译


     以下为原文

  Where we can find information about DC Settling Time in user manual Multimeter Device (34461A Model) and what is the value of this time?

When we tiet 2 probes of multimeter together in stable condition , the measurement voltage is not be fixed even after 2 minutes (you can see in a picture as below) .

Because we want to test a device that accuracy of measurment is so important for us (about micro volt ) , this device also has a settling time for itself and when we test it with multimeter , collision of these 2 settling time cause that we can not measure truly and affect our result .  
What we should do now ?   
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2018-10-10 17:17:35   评论 分享淘帖 邀请回答
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你所展示的,很明显是热电压的漂移,即总共14μV。
这与DMM建立时间无关。
如果您已经正确设置并缩短了DMM,它将在几秒钟内稳定到零左右。
请确保你在34461A上使用Auto Zero,你的“探头”是低热探头,并且连接接头在温度方面非常稳定,即没有任何外部加热。
还为这种低电压读数选择了正确的范围,即DCV 1V或100mV范围。
坦率

以上来自于谷歌翻译


     以下为原文

  What you are showing, is very obviously a drift by thermal voltages, i.e. 14µV in total.

This has nothing to do with DMM settling time. 
If you would have properly set up and shorted your DMM, it would settle within seconds to around zero.

Please make sure, that you engaged Auto Zero on your 34461A, that your "probes" are low thermal ones, and that the connection junction is really stable regarding temperature, i.e. w/o any external heating. Also chose the correct range for such low voltage readings, i.e. DCV 1V or 100mV range.

Frank
2018-10-10 17:25:03 评论

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