LIS3DH 5kHz ODR线路数量不对

大家好，

我想使用LIS3DH加速度计和带有ST Unico GUI的Steval-MK1109v2主板来记录加速度数据。
LIS3DH的数据表显示了可以测量高达5000Hz的带宽，这是我的振动器测量所需要的。

我使用Unico GUI将传感器配置为+ -2g和5000Hz模式。
我在振动器上尝试了一个160Hz的正弦信号并在Unico GUI上进行了在线FFT，但是在大约600Hz处出现了一个峰值，所以我看了一下.txt文件中的记录数据。我想添加一个时间路径，但认识到线路的数量根本不对。
我在大约3秒内记录了数据，但只得到了大约4000行。 ODR为5000Hz，预计可达16000线。

我测试了400Hz和1250Hz的模式，并且在线-FFT记录的数据都是正确的。
如果我之前使用0.0008s时间步长（1 / 1250Hz）记录5000Hz模式，它看起来是正确的......

所以我的问题是：
Unico GUI是否仅以高达1250Hz的速率记录数据（即使在5000Hz模式下），还是Unico GUI软件中的错误？
如果我查看GUI的错误在线FFT，其中显示600Hz但肯定只给出160Hz信号，它看起来就像那样。

我有点困惑。

谢谢你的帮助！

问候，
马库斯舒尔茨
＃lis3dh-ODR-带宽UNICO贵



以下为原文




Hello all,

I want to use the LIS3DH accelerometer and a Steval-MK1109v2 Motherboard with the ST Unico GUI for logging Acceleration data.  
The datasheet of the LIS3DH shows the possibility to meassure a bandwidth up to 5000Hz, which i need for my shaker meassurements.

I used the Unico GUI to configure the Sensor at +-2g and the 5000Hz mode.
I tried a 160Hz sine signal at the shaker and made an online FFT at the Unico GUI, but there was shown a peak at about ~600Hz, so i took a look at the logged data in the .txt-file. I wanted to add a timepath but recognised that the number of the lines weren�t right at all.  
I logged data at about 3 seconds but got only roundabout 4000 lines. With a ODR of 5000Hz i expected up to 16000 lines.  

I tested the modes with 400Hz and 1250Hz and both online-FFT an logged data were right.
If I use the 0.0008s timesteps (1/1250Hz) for the logged 5000Hz-mode before, it looks right...   

So theres my question:
Does the Unico GUI only logg data with a rate up to 1250Hz(even in the 5000Hz mode) or could it be a bug in the Unico GUI software?  
If I take a look on the wrong online FFT of the GUI, where 600Hz are shown but surely only a 160Hz-signal is given, it looks like that.

Im a little confused.

Thanks for your help!

Greetings,
Markus Schulz  
#lis3dh-odr-bandwidth-unico-gui