US 6,211,682 B1 · Method and circuitry for measuring loop resistance

Abstract

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.

Claims24

Dependent claims

An apparatus for measuring loop resistance of a transformer based detonation initiation device, said apparatus comprising:

a first two terminal, port for connection to a time varying test signal source;
a test port, intermediate the terminals of said first port, for connection to the leads of the transformer based detonation device to form a circuit path between said two terminals of said first port;
an output signal sensor connected to permit determination of steady state signals in said path;
whereby the loop resistance can be deduced from the steady state signals sensed at said output sensor.

1 more element

Dependencies are inferred from the claim text.

Method and circuitry for measuring loop resistance

Life of this patent

Method and circuitry for measuring loop resistance

Life of this patent

Abstract

Claims24