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[问答] 如何为LPS25H压力范围转化为“差分”测量?
162 LPS25H 测量
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问候。我想使用LPS25H / B作为压力测量装置,最高可达~15 psi''差分''。我知道数据表列出了260到1260hPa绝对值的功能范围,这如何转化为“差分”测量?我意识到所报告的差分测量结果是模拟的,并且不能使用物理访问参考压力。无论如何,看看24位,二进制补偿,每hPa压力输出4096LSB,你应该'没有电气问题报告高达~2048hPa或大约30 PSI绝对值 - 超出我的目的范围。在我的测试中,我可以实现高达8.3psi的差分输出,但是应用了8.3psi以上,报告的输出不再变化。限制因素是什么,我缺少什么?请注意,在~15psi时,我不需要特别高的精度。


如果LPS25H / B无法完成任务,您能推荐一款传感器吗?

以上来自于谷歌翻译


以下为原文




Greetings. I would like to use the LPS25H/B as a pressure measuring device up to ~15 psi ''dIFferential''. I know that the datasheet lists the functional range from 260 to 1260hPa absolute, how does this translate to ''differential'' measurements? I realize that the differential measurements reported are simulated and that physical access to a reference pressure cannot be used. Regardless, looking at the 24 bit, twos complement, 4096LSB per hPa pressure output, you ''should'' have no electrical issues reporting up to ~2048hPa or about 30 PSI absolute - more than enough range for my purposes. During my tests, I can achieve up to a 8.3psi differential output, but above 8.3psi applied, the reported output no longer changes. What is the limiting factor, what am I missing? Note that at ~15psi, I do not need particularly great accuracy.


If the LPS25H/B isn't up to the task, can you recommend a sensor that is?
0
2019-6-4 12:57:45   评论 分享淘帖 邀请回答
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你好,
LPS25H仍会在显示相关性的规格压力范围之外作出响应
 
 寄存器数据和施加的压力之间,但我们只保证可靠的数据
 数据表中规定的200和1260 mbar,这对大多数人来说已经绰绰有余了
 消费者应用。
 
 除此之外,我们的传感器没有超出规范行为的公开测试报告;
 在传感器的工作范围之外,您可能会发现与测试中的一组传感器之间的预期行为存在显着偏差。
 
 问候,
 阿达尔韦托

以上来自于谷歌翻译


以下为原文






Hello,
LPS25H will still respond outside of the specs pressure range showing correlation

between register data and applied pressure, but we only guarantee reliable data within  
200 and 1260 mbar as specified in the datasheet, which is more than enough for most
consumer applications.  

Other than that unfortunately there is no public test report for out of specification behavior of our sensors;
outside the operating range of the sensors you might find significant deviations from the expected behavior running across a set of sensors under test.

Regards,
Adalberto
2019-6-4 13:23:33 评论

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Adalberto-
 
 
 谢谢,我已经假设在建议的范围之外不能保证性能,考虑到我们需要的准确性,这对我们的应用来说不是问题。
 
 为了关闭这个循环,并为将来参考同一问题的那些人,我得到ST的确认,在绝对值为~23.2 psi时,传感元件“击中”其机械停止。
 
-克里斯

以上来自于谷歌翻译


以下为原文





Adalberto-


      Thanks, I already assumed that performance wouldn't be guaranteed outside the recommended range, this isn't an issue for our application considering the accuracy we need.  

     To close the loop on this, and for future reference for those that trip over this same question, I have confirmation from ST that at ~23.2 psi absolute, the sensing element ''hits'' its mechanical stop.

-Chris
2019-6-4 13:33:12 评论

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