Method and circuitry for measuring loop resistance

Details Method and circuitry for measuring loop resistance Method and circuitry for measuring loop resistance

G - Physics

01

R

G01R 31/02 (2006.01) F42B 3/10 (2006.01) F42C 21/00 (2006.01)

Patent

CA 2245395

This invention provides a method and electronic circuits for the testing of new initiation devices that use a small transformer whose heating element resistance can not be measured using traditional methods and instruments. A small current testing signal is applied to the primary winding of the detonator through its leg wires that are connected in a certain circuit configuration. The resistance of the secondary winding connected with the bridge wire is then reflected to the primary side and its effects are then observed. By calibrating the relationship of such effects with the value of loop resistance, the loop resistance can he displayed. Since the testing signal is very small in nature for safety considerations, the sampled effects (generally the voltage wave) are amplified. The amplified effects are displayed with analogue or digital meters or other display means.

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