w**i
发帖数: 136 | 1 我们实验室的系统在校准后, 测量很准确. 可是过了一段时间后, 即使环境温度等都没
有变化, 再测量时, 系统会有微小漂移. 这是为什么呀?
我们自己搭的系统, 电容电阻没有挑选, 就用手头上有的器件; 另外, 几个74HC系列的
芯片也是从其它板子上拔下来的, 或是随便找的, 会有温度, 湿度变化敏感吗? 这对系
统有影响吗?
搭精确稳定的系统时, 电容电阻还有器件选择有什么实用原则吗? 在不考虑成本的情况
下, 如何选择? | f*****0
发帖数: 489 | 2 how to minimize 漂移 depends critically on what kind of 漂移 you are having. | w**i
发帖数: 136 | 3 For my case, the reasons are unknown. 您知道大概的去除漂移的方法吗? 比如说用
温度系数小的电容电阻, 同类同功能的元器件, 选哪家的产品等? | f*****0
发帖数: 489 | 4
nobody is asking you why you have 漂移.
absolutely.
how to minimize 漂移 depends critically on what kind of 漂移 you are having.
【在 w**i 的大作中提到】
: For my case, the reasons are unknown. 您知道大概的去除漂移的方法吗? 比如说用
: 温度系数小的电容电阻, 同类同功能的元器件, 选哪家的产品等?
| w**i
发帖数: 136 | 5 It is a system, I really dont know what kind of 漂移 trapped me, but I guess
it is related to stability of capacitors and resistors, and maybe the
careless selection of chip manufacturers. | f*****0
发帖数: 489 | 6
guess
I would have never thought a simple question would have puzzled people for
this long.
if you don't know what kid of 漂移 it is, you should at least be able to
provide some information about how this 漂移 behaves so others can help you
diagnose it. something like how fast it moves, what it looks like on a
scope, how big it is, what it responds to, etc.
YOU have to help others help you.
【在 w**i 的大作中提到】
: It is a system, I really dont know what kind of 漂移 trapped me, but I guess
: it is related to stability of capacitors and resistors, and maybe the
: careless selection of chip manufacturers.
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