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Re: Measuring a Pulse Width
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5 Vp-p with a 2.5 V DC offset, right?
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Yes.
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Originally Posted by billbo911
To pull that input low, you need to ground the input, or at least pull it down low enough for the circuit to detect it as low. But, her comes the SWAG, the ground level needs to be referenced to the same ground used on the system with the pull up, got it? My guess is that the signal generator is not tied to the ground of the mini-rc, and therefore, the mini-rc if floating and not able to see the 0vdc portion of the square wave.
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The waveform generator I am using is an HP model. I have connected a BNC cable to the generator and that cable breaks out into two alligator clips, one positive and one ground. I connected the positive clip to the mini-RC's signal wire and connected the ground clip from the generator to the ground on the mini-RC. The mini-RC is being run off a battery. So I think they are both using a common ground.
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