Bob wrote: >I am trying to determine what tests apply under the EMC >directive to a piece of chemistry lab equipment. The device >is a small table-top "agitator" to mix up containers of "goop". >(note my chemistry terminology is limited.)
>The device in question has a variable speed 24VDC motor >controlled by pulse width modulation. The PWM chopper >operates around 20 kHz. The device plugs into a wall >outlet (120VAC or 240VAC) There are no microprocessors, or >any digital electronics in the device. In my opinion the generic standard EN 55011 for scientific equipment is the correct one (emissions).Right the generic standard for for immunity EN 50082-1 (not the EN 50082-2 for industrial environment!) but attention to the EN 50104 immunity standard (if it's used in domestic environment). The choice between class A or B depends from the power cord termination (fixed installation=class A or removable-type cable=class B) to the public line. bye, Paolo. -------------------------------- Paolo Fini - [email protected] Italponti Telecom EMC department Firenze - Italy --------------------------------
