Why does the XTBM indicate ^NOISE^ when the display has a low noise reading?
The primary function of the XTBM is to decode X10 commands and measure their signal levels. Certain types of noise can look enough like a X10 command that the XTBM will try to decode it rather than just displaying it as a noise level. In this case the XTBM will display ^NOISE^ or BSC (Bad Start Code) to indicate it cannot decode the X10 command, but it may not update the noise readout. If you receive either of these error indications, that receptacle has a serious noise level that will have to be resolved.
