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FvM, I think it turns out your assumption was correct. I didn't recall when I replied to your message that the RH % dropped like a stone to 2% when I changed R20 to about 30K. So, I tried increasing the resistance instead and pleasingly the RH value increase. It stays at 2-3% until the...
Re: BTHR918N Displaying Consistently Low R Reading
Hi FvM,
I reduced the resistance of both R18 an R20 but not both at the same time. I reduced R18 to just under 5K and R20 to about 30K but neither change appeared to make any difference. I'll try reducing both at the same time to see if...
Re: BTHR918N Displaying Consistently Low R Reading
Yes, I was thinking that myself and that it couldn't simply be a case of perhaps replacing R23 with a lower value resistor without perhaps affecting something fundamental. Anyway, I tried a 220K resistor in R23's spot and the % reading came up...
Re: BTHR918N Displaying Consistently Low R Reading
Thanks for you reply. Believe me, I'd like to provide more on the schematic side but Oregon Scientific don't provide that data. It may be close to the outside limits of the specified accuracy but it's never been that awful in terms of...
Hi,
I have an Oregon Scientific WMR928N weather station, which I've owned from new for many years. It has an indoor baro/temp/humidity sensor (BTHR918N) that works well enough aside from the relative humidity (RH) reading, which is significantly lower than my other hydrometers sat side by side...
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