ES270043U - Continuity test of a burglar connected with electric detonators. (Machine-translation by Google Translate, not legally binding) - Google Patents

Abstract

Continuity tester of a blast connected with electric detonators, whose purpose is to provide a means of determining whether a blasting line can be fired with a specific blasting device, depending on the resistance inherent to the line and the blasting element, providing a preferably visual triple indication, about the impedance of the line, is essentially characterized in that it is constituted by an electronic circuit comprising two operational amplifiers mounted as respective voltage comparators, the first of them having its inverting input subjected to a fixed reference potential, through a voltage divider while its output is related to two electro-luminescent diodes of different color and mounted in phase opposition through insulation diodes; it being provided that the second operational amplifier has its non-inverting input subjected to another reference potential through the corresponding voltage divider, while the output of said amplifier is related through corresponding isolation diodes with a third electro-luminescent diode of same color as one of those mentioned for the first operational, and with the electroluminescent diode of different color connected to the first operational, connecting the blast line to the coman terminal of the circuit and a resistance that converges at the midpoint of a third divider of voltage from which start a pair of resistors that connect, respectively, with the non-inverting input of the first operational and with the inverting input of the second operational amplifier, all being powered from a low voltage electrical battery. (Machine-translation by Google Translate, not legally binding)