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External Bridge Completion
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External Bridge Completion for Strain Gage Circuits |
The Wheatstone bridge used in most strain gage
measurement circuits usually consists of (a) the
gages for actively measuring the strains and (b)
precision resistors incorporated in the measuring
instrument for completing the circuit, as shown
below.
Sometimes, however, the circuit must be completed external to the instrument. The most common reason, of course, is when bridge completion resistors are not built into the instrument; but accuracy considerations can also be a factor. In certain test conditions, external bridge completion can reduce the effects of noise pickup in the leadwire system, or eliminate the effects of contact resistance. Suitable elements for completion of the bridge outside the instrument in these cases include: Functional differences, along with differences in product configuration and installation techniques, provide both advantages and disadvantages for each type of external bridge completion. |
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