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Dynamically adjusted A/D resolution

  • US 9,083,372 B2
  • Filed: 02/14/2013
  • Issued: 07/14/2015
  • Est. Priority Date: 03/31/2011
  • Status: Active Grant
First Claim
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1. A method of controlling an analog-to-digital (A/D) converter in a process variable transmitter that converts an analog input signal indicative of an industrial process variable to a digital output signal, the method comprising:

  • receiving the analog input signal indicative of the industrial process variable;

    performing a first measurement measuring a signal level of the analog input signal using the A/D converter, wherein a resolution of the A/D converter changes as the measured signal level of the analog input signal varies;

    introducing a signal offset into the signal level of the analog input signal to move the measured signal level to increase the resolution of the A/D converter;

    performing a second measurement measuring the signal level of the analog input signal with the offset;

    converting the analog input signal, measured using the second measurement, to the digital output signal; and

    sending information, using the converted signal, related to the industrial process variable over a transmission connection.

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