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Why 4-20 Ma Signal Is Preferred Over A 0-10v Signal? |
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Answer» GENERALLY in a transistor some amount of voltage is required for TURNING it on. This voltage is the cut in voltage. Up to this voltage the exists a nonlinearity in its characteristics. Beyond this cut in voltage the char. of transistor is linear. This NONLINEAR region LAYS between 0-4ma, beyond 4ma it linear. This is why 4-20 ma RANGE is used. Generally in a transistor some amount of voltage is required for turning it on. This voltage is the cut in voltage. Up to this voltage the exists a nonlinearity in its characteristics. Beyond this cut in voltage the char. of transistor is linear. This nonlinear region lays between 0-4ma, beyond 4ma it linear. This is why 4-20 ma range is used. |
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