How does word 15, bit 7 "No Calibration" ever get set on the HI 1746WS?

On the HI 1746WS, Bit 7 of Word 15 of the input table would be set if the module had only a default calibration in it. This bit should never be set in a fully operational unit. If the memory failed on your HI 1746WS module, so that at power up it could not restore the saved calibration, then it would power up with a default calibration and the "No Calibration" bit would be set. This would indicate a failure of the memory within the module.