Method for assigning a delay time to electronic delay...

Details Method for assigning a delay time to electronic delay... Method for assigning a delay time to electronic delay...

2011-06-21

2011-06-21

Fureman, Jared J (Department: 2836)

Electricity: electrical systems and devices

Igniting systems

For explosive devices

Reexamination Certificate

active

07965490

ABSTRACT:
In the method for assigning a delay time to an electronic delay detonator. The detonator includes a data register (24) into which a desired delay time value, supplied by a controller, is written. Subsequently, over a predetermined time period (t) the contents of the data register (24) is repetitively added to a counter register (26) in which the contents is accumulated. After a division of the counter register contents through the calibration time, the contents of the counter register (26) is subsequently counted down using the same oscillator (18) which has controlled the accumulation process. The invention allows the delay time value supplied by the controller to be exactly adhered with, using an oscillator (18) of low accuracy and without feedback from the detonator (12) to the controller.

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