5, expand annulus tensile test and result
Check precision to rise, overcome amplitude of interference signal, noise to wait for a problem greatly too, decide signal does not magnify via circuit, use the method that bridge circuit checks to signal directly. Bridge circuit sees a picture 6. Power source uses power supply of dry cell series connection, assume in the experiment meet an emergency piece after resistor happening changes, size of voltage of two parallel circuits keeps changeless, criterion the V of voltage signal △ that data collects analyzer place to record is usable (13) type expression:
Among them, k is meet an emergency piece strain gauge factor, ε is meet an emergency, △ R meet an emergency piece resistor change value, r is meet an emergency piece block value. By (13)(14) is attainable: