## Solution

Frequency accuracy (sometimes called timing accuracy) is usually given in parts per million (ppm) of the sample rate. This value depends on the device that you are using and can be found in the device's specifications. In addition to frequency accuracy (f

_{a}), frequency error (f

_{e}) is also something that you can calculate, using the equations below:

Measured frequency (f

_{m}) = signal frequency (f

_{s}) ± frequency error (f

_{e}).

Rearranging the above equation to solve for frequency error:

Frequency error (f

_{e}) = signal frequency (f

_{s}) * frequency accuracy (f

_{a}).