Then, if I don't want to record the data, is it as simple as pulling out the datalink module before any calibration procedure? Then making sure to clear the console data, and plugging the module back in?
I don't understand your last paragraph.
If I were to physically take my ISS unit into the bathroom, with saturated air, in order to make sure it was in a 100% RH environment, I'd have to read the RH from the console. My console is recording the data and downloading to my computer.
What must I do to ensure that the calibration data doesn't end up in my data files on the computer?
Same question if you wanted to calibrate the rain gauge...
Did that explain it better?
Oh. Sorry I was being dense.
As you said, you COULD disconnect, measure, and then clear the data.
However, my preferred approach would be to not clear the data - just let WeatherLink download the data, and then go into the Browse window and edit those values that you know to be wrong, to be "right".
With either method, you will have some concern with things like highs (daily, monthly, annual), lows, etc. that have different (or no) way to change/clear them.
There are two main reasons to not use the "steamy bathroom" approach. The above is one reason, and the other reason is that you have no evidence that your "steamy bathroom" is 100% RH. [If you have or can borrow an accurate humidity meter, then obviously you don't need a steamy bathroom].
Also, in my opinion, it's not advisable to try to calibrate the rain gauge. Unless you want to make a career of doing that. YMMV.