The PM 5131 function generator is an instrument designed for applications extending from the educational to the general purpose area. It produces sinewave, triangular and squarewave output signals, the frequencies of which are adjustable in three logarithmical sub-ranges from 0.1 Hz to 2 MHz. The frequency vernier allows the frequency setting to be varied from —20 % to +20 %. The output voltage is continuously adjustable up to 30 Vpp and can be attenuated in steps of 10 dB down to 60 dB. A continuously adjustable output voltage can be selected separately or whenever used as d.c. offset voltage added to the selected output signal. The generator provides a more than 3 decade sweep facility with adjustable sweep range and a variable sweep time from 10 to 150 secondes. For instance it is possible to cover the audio frequency range of 20 Hz to 20 kHz in one continuous sweep. Moreover external sweep and frequency modulation can be performed. For TTL applications a separate output is available. The ergonomic design of the controls and sockets serves for convenient operating the instrument.