Factory Calibration: The tuning or altering of a control device by the manufacture to bring it into specification.

Fahrenheit Scale: A temperature scale that defines the freezing point of water as 32 degrees and the boiling point of water a 212 degrees.

Fixed Point: The point where all heat energy applies or removed is used to change the state of a substance.

Flux: (1) A material used to promote fusion or joining of metals in soldering, welding, or smelting. (2) A general term used to designate collectively all the electric or magnetic lines of force in a region.

Force: A push or pull which produces or prevents motion or has a tendency to do so.

Force Measurement Device: Any device which a quantitative determination of an applied force can be made.

Forced Vibration: The motion caused by some mechanical excitation.

Free Vibration: Vibration that occurs without forcing.

Frequency: The number of recurrences of a periodic phenomenon.

Frequency Meter: An instrument for measuring the frequency of an AC signal.

Full Scale Output (FSO): The output at rated capacity minus the output at zero applied force.

Fundamental Method of Measurement: The method of measurement in which the value of a measurand is obtained by measurement of the appropriate base quantities.

Fundamental Mode of Vibration: The lowest natural frequency.

Function Tests: Function test often duplicates unit test activities sincefunction testers do not assume that unit test is adequately done.