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Subject: Re: Formula

Date: 12/20/01 at 8:37 AM
Posted by: David Ashby
E-mail: dashby@quin.co.uk
Message Posted:

In Reply to: Re: Formula posted by Ted Pantenberg on 12/18/01 at 10:54 PM:

Hello Ted,Just one or two thoughts:There's no way the filter circuit you described should generate the discontinuity you're finding on the graph. But if it is happening NEAR the borderline between triggering the crowbar and not triggering the crowbar, perhaps the voltage at the R-C filter output is levelling out just below the necessary threshold. Then, when it DOES trip, it is due to noise. If the extended tripping delays are somewhat random, that's a clue which lends weight to this speculation.In the op-amp stage, is there any finite resistance across the capacitor? If there is, that could limit the output ramp of the integrator when the input signal is small. That would also cause the trip time to increase more than you would expect.Hope this might help you figure out what's going on.David Ashby

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