Topic: One ISS, Two Consoles, Two Readings

[WXman]

I have one ISS sending data to two consoles on channel 2. Both consoles show temperatures and humidity that are different. What would cause this? I'm in a rural area with no other weather stations near me. I'm confused.

[Bushman]

Are the clocks set to the exact same time?

[galfert]

Calibration difference - check calibration.
Even if set to same channel maybe one is picking up neighbor's station - change channel on ISS.

[WXman]

The clocks are maybe a few minutes apart. Would that matter much?

I'm in a rural area. Nobody else within miles has a Davis station.

[johnd]

Give us some examples of the T/H differences. As galfert says, are you sure that one or other console doesn't have eg a temperature calibration offset?

[WXman]

The ambient temperature is running about 1ﾟ to 1.5 degrees different between consoles and the dew point temperature is 1ﾟ different between consoles.

 I will check the calibration to make sure both are 0.

[WXman]

Well that was it. I don't remember ever having done it, but one console had a -1 calibration for outside temp which of course throws off the humidity. Doh!! It's always the simple things that I overlook. Thanks everyone!

[galfert]

But if you have a new replacement temp/humidity sensor you would need the -0.9°F adjustment on both consoles to be accurate. New sensors require this adjustment (for some console revisions). You wouldn't want it to be zero.

Read about this on this page:
https://www.scaledinstruments.com/shop/davis-instruments/parts/vantage-pro2-parts/temperature-and-humidity-sensor-parts/davis-7346-070-pro2-digital-temperature-humidity-sensor-sensiron-sht31/

[WXman]

Thanks for the info.

[WXman]

So after reading that article it sounds like the calibration only needs to be done if you have incompatible transmitter board and sensor. Since my ISS is new with factory components I shouldn't have to do that at the console right?

[johnd]

Correct.

[WXman]

Thanks.  Not sure how that happened, but glad I finally discovered it.  Funny thing is, I always thought my AcuRite station running next to it was reading high and it turns out it's pretty close afterall.