The PM 3240 Portable h.f. oscilloscope enables the measurement of signals at a high sensitivity (5 mV/DIV) over a large bandwidth (50 MHz). There is a wide choice of display possibilities, such as one channel, two channels alternately or chopped, two channels added, with normal and inverted position for one input signal, and a main and delayed time-base. The PM 3240 oscilloscope features a tapless power supply with low dissipation. This power supply works on any AC mains voltage between 90 V and 264 V, or any DC voltage between 100 V and 350 V, thus obviating the need of adjusting the instrument to the local mains voltage. All these features make the oscilloscope suitable for a wide variety of applications.