Anti-Tamper Digital Clocks - An Overview

Anti-Tamper Digital Clocks - An Overview

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The CL100 attributes an attain panel (with ligature resistant/tamper resistant barrel lock and circular vital) for staff to change details on the LED Monitor devoid of doing away with the quilt/clock during the wall.

Resettable delay line segments in between a resettable hold off line section 210-1 related to a least delay time as well as a resettable delay line segment 210-N related to a most delay time are Every single related to discretely rising hold off times. An evaluate circuit 240 is induced by a clock CLK and uses the plurality of delayed monotone signals to detect a voltage fault.

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Another element of the invention may possibly reside in an apparatus for detecting voltage tampering, comprising a circuit that gives a monotone signal, a plurality of resettable delay line segments, and an Assess circuit: The circuit gives a monotone signal during an Assess time period. The plurality of resettable hold off line segments hold off the monotone signal to deliver a respective plurality of delayed monotone alerts.

forty one. The equipment for detecting voltage tampering as described in claim 40, wherein the water level amount is set determined by delayed monotone indicators from a number of prior Consider time.

Resettable delay line segments between a resettable hold off line segment linked to a least delay time plus a resettable hold off line phase associated with a greatest delay time are Each individual connected to discretely increasing delay instances. An evaluate circuit is activated by a clock and makes use of the plurality of delayed monotone alerts to detect a voltage fault.

nine. The apparatus for detecting clock tampering as described in declare 8, additional comprising: implies for resetting the implies for delaying the monotone signal in the course of a reset time period, whereby the check here reset period of time is before the clock evaluate period of time.

In-body structure allows clock to get accessed for adjustment or battery transform without the need of eradicating metal housing

The monotone 0 to 1 changeover could possibly be accomplished by introducing reset operators. Just about every reset operator may reset the respective hold off line of the sensing circuit throughout the reset phase to some identified point out impartial of any setup-violations, when the circuit senses throughout the analysis stage. With no reset operators, the sensing circuit that detects slower than predicted frequencies could be within an unknown condition.

The reset time period may be ahead of the evaluate time period 310. Using the clock CLK to result in the evaluate circuit 220 may perhaps utilize a clock edge at an stop from the Appraise time period to trigger the Consider circuit.

In-body design and style allows clock for being accessed for adjustment or battery alter with out getting rid of steel housing

eighteen. The apparatus for detecting clock tampering as defined in declare 15, wherein the evaluate circuit determines irrespective of whether the amount of types inside the plurality of delayed monotone signals differs from a drinking water amount selection by much more than a predetermined threshold to detect a clock fault.