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| PACKAGE |
| Physical holder of the crystal unit. |
| PARABOLIC TEMPERATURE CURVE |
| BT-cut and Tuning Fork crystal frequencies follow a parabolic curve over temperature. The frequency will decrease as the temperature goes above or below the turnover temperature. |
| PARALLEL RESONANT. PL |
| A parallel resonant oscillator circuit uses a crystal unit that is designed to operate with a specified value of load capacitance. This will result in a crystal frequency higher than the series resonant frequency, but lower than the true parallel resonant frequency. |
| pF |
| The abbreviation for "picoFarad" used to describe a fractional part 10-12, (one trillionth) of one Farad. |
| Pico |
| A prefix used to describe a sub-multiple of a number. One Pico is one-trillionth, 10-12, of a unit. |
| PLATE |
| The quartz blank or resonator. |
| POLISH |
| A process used in the manufacture of some types of quartz crystals. The polish process results in a very fine surface finish. The word "polish" is also used to define the material used in the polish process, as well as the process itself. |
| PPM |
| The abbreviation for "Parts Per Million" a method of calculation used to specify the permissible frequency deviation of a crystal or oscillator. May also be seen as "PPM", both are correct. |
| PULLABILITY |
| The change in frequency of a crystal unit, either from the natural resonant frequency, Fr to a load resonant frequency, FL or from one load resonant frequency to another. The frequency can be pulled in a parallel resonant circuit by changing the value of load capacitance. A decrease in load capacitance causes an increase in frequency, and an increase in load capacitance causes a decrease in frequency. |