This document uses the form

to describe the error of many of the RES11A parameters in a ratiometric manner. This expression expands to

Thus, the difference or absolute error between the actual and nominal value of a given parameter is

Param_actual shares the same units as Param_nominal, such as V/V or Ω/Ω when describing circuit gain, while t_Param is unitless by default. Because the error tolerances of the RES11A are so low, t_Param errors are typically expressed in units of ppm, by multiplying the error by 10⁶. To convert t_Param from ppm back to a unitless decimal value for error calculations, divide the t_Value by 10⁶. Refer to Section 7.3.1 for an example of this.

As many of the RES11A error terms (such as gain error and gain temperature coefficients) scale according to the nominal gain, this notation provides a convenient way to standardize values across the various RES11A ratios. When converting ratiometric errors to absolute errors (or vice versa) for error analysis calculations, be cautious of notation and remember to scale t_Param errors by Param_nominal when appropriate. Section 9.7 includes a list of the various error terms that appear throughout the document, and a summary or definition of each.

In some cases, such as when describing divider ratio or gain, the same equation applies to both divider 1 and divider 2. In this case, a notation of Param_x is used, where x is either 1 or 2. For example, when generically describing ratio error,

For the ratio error of divider 2 specifically,