Sunday, June 16, 2019

Drift stability of Honeywell HSC sensors

I arranged a simple experimental setup to measure the long-term (i.e., over a day or so) drift of the Honeywell HSC sensors. This was the apparatus:

Basically, I breadboarded three HCSDRRN040MD2A3 differential sensors and took data from them for a day, and plotted it all out. The sensors should, of course, read zero for the entire time. The results look like this:

The worst-case drift is 8 Pa. The sensors are +/- 40 mBar range, or +/- 4000 Pa. The full scale span is therefore 8000 Pa, making the drift (8 / 8000 * 100) = 0.1% of full scale.

The maximum zero error (without autozero) is about 17 Pa, which is about 0.2% of full scale.

By comparison, when we tested an All Sensors chip in this blog post, we found that the maximum drift was about 0.27% of full scale, and the maximum zero error was 0.88% of full scale.

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