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Home Q & A Board Science-Related Homework Help Physics
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Fireman 23 Fireman 23
wrote...
Posts: 172
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11 years ago
why the  most common nominal resistance values of strain gauges are 120, 350, 700, 1000 ohms?
Some one told me that it is because of the nominal resistance of the first proposed strain gauge in american in 1938 is 120 ohms.
so now all the strain gauges in world follow these values.
but why? and why the gauge factor is 2?
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wrote...
#1
11 years ago
Because that is what they originally built their resistances to be.  There is no reason why it couldn't be anything else.
wrote...
#2
11 years ago
Probably the makers of strain gauge instruments standardized on using a 120 ohm gauge a long time ago, and now that is the value that works well with standardized instruments. This effect is often called  "lockin" and occurs in many technical fields. 50 ohm RF coaxial cable, 300 ohm twin TV cable, VHS videotape, the Iphone etc.
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