The PM 3244 portable h.f. oscilloscope features four identical vertical deflection channels with high sensitivity (5 mV/div.) over a large bandwidth of 50 MHz. There is a wide choice of vertical deflection possibilities, such as one, two, three or four channels (alternately or chopped) Also adding of the first two channels and of the last two channels is possible. The polarity of each channel can be inverted. Horizontal deflection possibilities are: main time base (with or without intensified delay time base), delayed time base, or external deflection. Except the normal trigger source choice the PM 3244 also features composite triggering. This oscilloscope has a low dissipation tapless power iupply, working on any a.c. line voltage between 90 V and 270 V, or any d.c. voltage between 100 V and 350 V.