I'm having problems with documentation and what appears to be conflicting use of the word grounded. The way I understand it, a thermocouple can be [grounded, ungrounded, or unsheathed] (http://www.omega.com/techref/themointro.html). But neither of the two wires are actually connected to ground, they're still floating when they go into the thermocouple amplifier.
However, I've been reading a lot about thermocouples and they talk about grounding them by connecting the T- side to ground through a 1M resistor. This is a completely different type of grounding to me (http://www.analog.com/library/analogdialogue/archives/44-10/thermocouple.pdf)
I'm trying to use a Max31855 breakout board, and it specifically says it's not compatible with grounded thermocouples. So which grounding do they mean? I've not had either wire connected to ground (but I'm using a K-type grounded thermocouple), and occasionally a static shock when I touch it will reboot my Arduino and send out all kinds of garbage over the serial.