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The spring material used in a spring control device should have the following property.
- AShould be non-magnetic
- BMost be of low temperature co-efficient
- CShould have low specific resistance
- DAll of the above
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The essential requirements for an instrument springs are:
1) They should be non-magnetic
2) They should be proof from mechanical fatigue
3) Where springs are used to lead current into a moving system, they should have a small resistance, their cross-sectional area must be sufficient to carry the current without temperature rise affecting their constant.
4) They should also have a low resistance temperature coefficient
For most applications’ phosphor bronze has been found to be the most suitable material except in instruments low in resistance (like multi-voltmeters).
1) They should be non-magnetic
2) They should be proof from mechanical fatigue
3) Where springs are used to lead current into a moving system, they should have a small resistance, their cross-sectional area must be sufficient to carry the current without temperature rise affecting their constant.
4) They should also have a low resistance temperature coefficient
For most applications’ phosphor bronze has been found to be the most suitable material except in instruments low in resistance (like multi-voltmeters).