Hello all, I am currently testing two types of airspeed sensors (MS4525DO and MS5525) to see which is more suitable for mounting on my aircraft. I noticed from the forum post here (New Airspeed Sensor MS5525 for Arduplane 3.8) that the new MS5525 is claimed to have less noise than the old MS4525.
However, when I ran some simple tests on both airspeed sensors, I noticed that the MS5525 sensor has more noise than the MS4525. Here are two screenshots from the flight logs which I used to record the airspeed data (I am using Plane 3.8.4 firmware).
Old sensor (MS4525):
New sensor (MS5525):
From the screenshots above, the MS5525 has noise around the 2.5-3m/s region while the MS4525 has noise around the 1.5 - 2m/s region.
Other things that I have done in my tests:
- Check how the sensors perform at higher airspeed by using a fan
- Repeat the test with a different MS5525 sensor, to make sure the noise is not due to a faulty sensor.
- Repeat the test with 3.8.5 firmware instead of 3.8.4; I have read that the new 3.8.5 firmware had included some updates related to the MS5525
All of the above actions still resulted in the MS5525 having higher noise than the MS4525DO.
I am curious to why the MS5525 performs worse than the MS4525 when the forum link says otherwise. I tried to look through the datasheets for both sensors (here and here) to find out what are the manufacturer noise specifications, but I don’t really understand them.
Anyone has used the MS5525 and also experienced higher noise? Or does anyone know what are the intended noise specs for both sensors, and which sensor is supposed to have less noise?
Thanks in advance for the help!