## 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}).