Hi Mike - The manual says to use a quality digital ohm multimeter "able to measure up to 20,000 ohms. To check for breaks, it says "Measure resistance between the black and white cable leads. This measurement should be within the cable resistance range shown on the nameplate label. Measure between the lead wires of the floor sensor. This resistance varies according to the temperature sensed in the tip. A cut or break in the wire is indicated by a resistance of "infinite" ohms (no continuity)."
To check for breaks, it says "Measure resistance between the black and green leads and between the white and green leads. These measurements should be "infinite" ohms (no continuity). A cut or pinch in the wire is typically indicated by a resistance value less than the cable resistance range."
So, when I touch the ohm meter leads to the black and white wire with the ohm meter set at 20K I get a reading of .05. When I touch the ohm meter leads to the black and green and white and green wires I get "1". "1" is what is displayed in the ohm meter window before I touch the leads to any wire.
Am I getting the readings I should get with the cable fresh out of the box?
Mike asked me to help you out.
What the manufacturer wants you to do, is verify that the cabling is in good shape before it gets installed and then to recheck it before you install your tile or flooring.
So the first step will be, to make sure there not any readings from black to ground or white to ground and that you have a reading between black and white.
Does the reading between black and white equal the resistance marked on the product lable?
If you set the meter to 1K or auto you will see the reading is closer to the tag.
After you install the cable check it again to make sure the readings did not change.
Let me know if you need more help.