A method of testing a valve, the method comprising: communicating, by a portable measurement device, a sequence of control signals to the valve to cause adjustment of a position of the valve, wherein the sequence of control signals is communicated to the valve at a first measurement time; receiving first valve signature data corresponding to the first measurement time, wherein the first valve signature data includes data values representing positions of the valve resulting from the sequence of control signals communicated to the valve; receiving second valve signature data corresponding to at least a second measurement time that is different from the first measurement time, wherein the second valve signature data includes data values representing positions of the valve that resulted from: communication of the sequence of control signals to the valve at the second measurement time; measurement of positions of the valve resulting from communication of the sequence of control signals to the valve; and storage of the measured positions of the valve in a memory as the second valve signature data; comparing the first valve signature data with the second valve signature data and determining whether the valve is calibrated or has a fault based on the comparison; and providing a valve calibration instruction when the valve is determined to not be calibrated or when the valve has a fault, wherein the portable measurement device re-measures the valve signature data after calibration of the valve in response to the valve calibration instruction, by communicating the sequence of control signals to the valve and in response thereto, receiving re-measured valve signature data for the valve, wherein the re-measured valve signature data includes data values representing positions of the valve resulting from communication of the sequence of control signals to the valve. communicating, by a portable measurement device, a sequence of control signals to the valve to cause adjustment of a position of the valve, wherein the sequence of control signals is communicated to the valve at a first measurement time; receiving first valve signature data corresponding to the first measurement time, wherein the first valve signature data includes data values representing positions of the valve resulting from the sequence of control signals communicated to the valve; receiving second valve signature data corresponding to at least a second measurement time that is different from the first measurement time, wherein the second valve signature data includes data values representing positions of the valve that resulted from: communication of the sequence of control signals to the valve at the second measurement time; measurement of positions of the valve resulting from communication of the sequence of control signals to the valve; and storage of the measured positions of the valve in a memory as the second valve signature data; communication of the sequence of control signals to the valve at the second measurement time; measurement of positions of the valve resulting from communication of the sequence of control signals to the valve; and storage of the measured positions of the valve in a memory as the second valve signature data; comparing the first valve signature data with the second valve signature data and determining whether the valve is calibrated or has a fault based on the comparison; and providing a valve calibration instruction when the valve is determined to not be calibrated or when the valve has a fault, wherein the portable measurement device re-measures the valve signature data after calibration of the valve in response to the valve calibration instruction, by communicating the sequence of control signals to the valve and in response thereto, receiving re-measured valve signature data for the valve, wherein the re-measured valve signature data includes data values representing positions of the valve resulting from communication of the sequence of control signals to the valve.