1. A process variable transmitter, comprising: an analog-to-digital (A/D) converter receiving a sensor signal provided by a sensor that senses a process variable and converts the sensor signal to a digital signal; a processor that receives the digital signal and provides a measurement output indicative of the digital signal; and a noise detector that receives the sensor signal and generates a first value indicative of a number of positive noise events relative to a positive threshold value and a second value indicative of a number of negative noise events relative to a negative threshold value, the processor evaluating the noise count and generating a noise output, indicative of detected noise, based on the first and second values.