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VCM LAMINAR FLOW HOOD – VERTICAL
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... This unit is designed to provide a particle-free work environment by filtering the air through a high efficiency particulate air filter; a HEPA filter. The cabinet is designed to operate under constant positive pressure in order to maintain the cleanest work environment possible within the work spac ...
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... boundary between the two set at 1000 V although care must be taken as some authors have located the boundary as low as 380 Vac when differentiating between the two “types” of shock. It has already been seen that the body resistance remains nearly constant above about 700 V. This happens because at 7 ...
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... fT is defined as the transition frequency which small-signal current gain drops to unity. It is a measure of the maximum useful frequency of a transistor when it is used as an amplifier. fT can be easily obtained by converting measured S21 parameter to H21 parameter. fT = ...
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Opto-isolator



In electronics, an opto-isolator, also called an optocoupler, photocoupler, or optical isolator, is a component that transfers electrical signals between two isolated circuits by using light. Opto-isolators prevent high voltages from affecting the system receiving the signal. Commercially available opto-isolators withstand input-to-output voltages up to 10 kV and voltage transients with speeds up to 10 kV/μs.A common type of opto-isolator consists of an LED and a phototransistor in the same opaque package. Other types of source-sensor combinations include LED-photodiode, LED-LASCR, and lamp-photoresistor pairs. Usually opto-isolators transfer digital (on-off) signals, but some techniques allow them to be used with analog signals.
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