requency Stability in a crystal oscillator is usually represented in ppm (parts per million). However, it is easier to understand this in terms of frequency. This calculator converts the ppm value of frequency stability to give you the equivalent variation in Hz.
Result
Hz
KHz
KHz
The frequency stability of a crystal oscillator indicates the variation in the output frequency of the radio frequency (RF) signal generated by the oscillator. This variation is caused due to several external factors, which include temperature or pressure variation, voltage variation, current variation, output load, frequency aging, and other environmental conditions. Crystal oscillator manufacturers provide this parameter in the datasheet to indicate the stability or performance of the oscillator. The units are given in ±Hz or ppm (parts per million).
Oscillators and other frequency control devices specify their frequency variation in units of parts per million (ppm). However, it is relatively easier to understand if it is represented in terms of frequency as in Hz. This calculator converts the input frequency stability in ppm to its equivalent Hz. The below formula is used to perform this conversion:
To understand ppm, let us take an example. Let us consider an oscillator that has an output frequency of 10 MHz and a frequency stability of 20 ppm. This indicates a variation in the frequency by 50 kHz (i.e. 
. Therefore, the minimum and maximum frequencies are 9.950 MHz and 10.050 MHz.