![]() ![]() An example of this is illustrated in Table 1. Total accuracy is therefore equal to the sum of the two: ±(0.1% of input +1.0 mV). In contrast, gain errors do depend on the magnitude of the input signal and are expressed as a percentage of the reading, such as ☐.1%. An example might be given as ☑.0 millivolt (mV) offset error, regardless of the range or gain settings. Offset errors can be given as a unit of measurement such as volts or ohms and are independent of the magnitude of the input signal being measured. Accuracy specifications usually contain the effect of errors due to gain and offset parameters. Moreover, even when they are given, do you know how they apply to your system and to the variables you are measuring? Some specifications are given as worst-case values, while others take into consideration your actual measurements.Īccuracy can be defined as the amount of uncertainty in a measurement with respect to an absolute standard. Unfortunately, not all of these specifications are uniform from one to another or expressed in the same terms. Instrument manufacturers usually supply specifications for their equipment that define its accuracy, precision, resolution and sensitivity. This document is intended for users who operate and interpret the results of a DAQ measurement system. This document explains the difference between the terms accuracy, precision, resolution, and sensitivity as applied to a measurement system. ![]()
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