![]() ![]() It could be pulses in the actual atmospheric pressure pattern or it could be disturbances to that pattern from other sources. The scale of the variation shown is really small, with peaks showing up on the 0.1 mb level with periods of about 5 minutes. ![]() Second and foremost, however, is that within the clean environment of these new measurements, there is still a real physical variation of the pressure on a sub-millibar level that is clearly detectable with this $15 app. That sensor circuit seems to be defective on this very low background level, and that oscillation is almost certainly artificial. I believe now that this was an electronic cross talk between the green one above and the other two. All these showed that pattern on some level and they were more or less in sync. First, it looks like what we saw earlier measured indoors, namely about 0.1 mb oscillations at about a 70-sec period was somehow unique to being indoors and connected via the ground connection.
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