The data gathered usable range, resolution ratio on the apparatus and gained and determined the minimum voltage change that can be surveyed. The change of this voltage has represented the lowest effective location 1 LSB on the digital value ,Also often known as encoding the width. The ideal code width is a voltage range divided by gaining and exponential product once of resolution ratio of 2. For example, gather the apparatus in a kind of 16 multi-functional data of NI – -NI 6030E, its alternative range is 0- 10V or 10- 10V; Alternative to gain it as 1, 2, 5, 10, 20, 50 or 100. When voltage range is 0- 10V, gained as 100, the ideal code width is decided by following formula:

While assessing the data and gathering the products, need considering the non-linear degree DNL of differential , relative precision, appearance use steady time and noise of the amplifier etc..