scope:

This specification covers the general requirements for tubular-trimmer, piston-type, variable capacitors intended primarily for use in high-frequency trimming applications where relatively few adjustments are required during the effective life of the equipment.

The type designation shall be in the following form, and as specified (see 3.1 and 6.1):

The style is identified by the two-letter symbol "PC" followed by a two-digit number; the letters identify tubular-trimmers piston-type, variable capacitors, and the number identifies the shape or differentiating electrical characteristics of the capacitor.

The characteristic is identified by a single letter in accordance with table I. TABLE I. Characteristic.

Symbol Operating Temperature coefficient Capacitance temperature referred to an ambient drift range temperature of 25°C --------------------------------------------------------------------------------------------------- °C Parts/million/°C G - - −55 to +125 ±150 ±.5% of maximum rated value H - - −55 to +125 ±100 ±.2% of maximum rated value or .04 pF (whichever is greater) J - - −55 to +125 ±50 ±.15% of maximum rated value or .02pF (whichever is greater) Q - - −55 to +150 +50, −0 ±.1% of maximum rated value or .01pF (whichever is greater) T - - −65 to +125 ±20 ±.1% of maximum rated value or .01pF (whichever is greater) L - - −55 to +125 50 ±50 ±.1% of maximum rated value or .01pF (whichever is greater)

The nominal maximum rated capacitance value expressed in picofarads (pF) is identified by a three-digit number; the first two digits represent significant figures and the last digit specifies the number of zeros to follow. When fractional values are required, the letter "R" shall be used to indicate the decimal point. For example: 8R5 indicates 8.5 pF.