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Extra resources for A simplified guide to using the MCS51 on-chip UART

Example text

Electrical laws state that the current path will be the one of least resistance (DC) or impedance (AC). For discussion purposes, the current path is assumed to be the shortest path back to the voltage source because the conductivity of all portions of the metal box is uniform. Also, in this discussion, the charges are assumed always to have sufficient time to be distributed throughout the box. Although electrons move at high speed, their speed is finite. With a voltage source that alternates at a sufficiently high frequency, some electrons may not move fast enough to reach the voltage source before the polarity of the voltage source reverses.

The shield wall must be included as a path for the current returning to the generator. If return currents in the shield wall are neglected, openings in the shield wall (such as slots) can radiate RF energy to the environment and increase worker exposures. Current flowing from a generator to a two-electrode field applicator system (usually one electrode is grounded) must return to the generator. The forward currents flow from the generator to the applicator electrodes. The return currents flow from the applicator electrodes back to the generator, sometimes through the shield.

There should be an uninterrupted current path from one side of the opening to the other that provides a low impedance path for shield currents across the opening. The low impedance path will reduce RF energy leakage and worker exposure from the shield. 41 Safety in the use of RF heaters and sealers Figure A-4. Slot openings parallel to current paths improve shielding compared to non-parallel slots Press flange Slot in shield plate (for adjustment up or down) Flexible metal loop Slots between shield plates RF generator cabinet Piston (to raise or lower top plate) Switch (to lower top plate) Dotted arrows indicate current paths Metal support pedestal Current path Aluminium "cookie sheet" Piston (to raise or lower top plate) Shield plate Bottom plate Metal support pedestal 42 Press flange RF generator cabinet Shield plate Dotted arrows indicate current paths Appendix A Figure A-5.

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