The Farnell FG3 function generator is a mains operated instrument providing sine, square and triangular waveforms. These waveforms are derived from a common oscillator extending from 0.02Hz to 200kHz in five switched decade ranges with provision for extending the lower frequency to .002Hz. The dial spans three decades and is calibrated with both logarithmic (log.) and linear (lin.) scales. Internal log. or lin. sweep is provided by a separate oscillator having a fixed period of approximately 8mS. The sweep width is adjustable from approximately 20:1 to 1000:1 by means of a back panel mounted preset control and the sweep period may be extented by the addition of a non-polarised capacitor to the back panel. The FG3 can also be swept by an external voltage source applied to the 'V.C.0. IN' terminal.