Argh! Wrong quotation mark.
Here’s the code section again, being a bit more careful with the ticks:
Logging with Ch1 temperature and Ch2 AC voltage, gives these columns:
Time[s] INT Temp[C] V Voltage[V] RMS INT Temp[C] RMS V Voltage[V]
27628 23.025811 -0.000549 -271.530612 0
OK, this looks about right.
But if I log with the top channel being AC mV, and lower being Temperature, I get this:
Time[s] INT Temp[C] (blank) RMS INT Temp[C] RMS
28008.8 -0.236309 23.000874 0 -271.530
Something strange going on here – the temperature column is now a small negative number, the real temperature is in a column with a blank heading, and the RMS is -271.5. What are the RMS columns on the right? Why does the termperature RMS come out as -271?