Compensation Methods of Effect of Lead Wire Extension
If the lead wire or cable is extended with the quarter-bridge or half-bridge system, additional resistance is initiated in series to the strain gage, thereby decreasing the apparent gage factor. For example, if a 10 m long lead wire with 0.3 mm2 conductors is used, the gage factor decreases by 1%. In the case of the full-bridge system (transducer), the extension decreases the excitation voltage too. In these cases, the real strain ε is obtained by the following equation. (Supposing the gage factor Ks is 2.00):

Lead wire resistance values
Cross Section (mm 2 ) |
Number of Standards/Wire Diam.(mm) | Reciprocating Resistance per 10 m(Ω) | Remarks |
---|---|---|---|
0.08 0.11 0.3 0.5 |
7/Φ0.12 10/Φ0.12 12/Φ0.18 20/Φ0.18 |
4.4 3.2 1.2 0.7 |
L-6 L-9 L-2 L-5 |