Active Probe Reaches 3 GHzWhen you think of a scope probe, you usually think of what is basically a wire with a spring hook and an attenuator.
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Active Probe Reaches 3 GHz
When you think of a scope probe, you usually think of what is basically a wire with a spring hook and an attenuator. Those are passive probes. [Kerry Wong] shows off a pre-release active probe that sidesteps some problems with those ordinary passive probes.
The trick is that passive probes have input capacitance that interferes with very high-frequency signals. They also tend to have less noise. Although the probe isn’t on the market yet, it is set to debut at a price lower than competitive probes. Still, be warned. The reason you don’t see them more often is that $1,000 is relatively inexpensive for an active probe.
Because the probe is pretty hefty, it comes with a tripod that can hold it while you use it. [Kerry] connects some probe adapters to a PCB with two square wave oscillators. Square waves are a good test waveform because they have odd-numbered harmonics that rise well above the target frequency.
The probe adapters are a little longer than you might like, which causes some ringing on the input signal. However, if you compare the results to a standard passive probe, you’ll quickly see the value of the active probe setup.
You can save some money if you roll your own, of course. Most of the ones we’ve seen don’t quite make 3 GHz, though.
youtube.com/embed/pN8wHRxeny4?…
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@marcocappato
Dopo il Venezuela pensava si fare la stessa cosa con l'Iran, credeva di mettere le mani nella marmellata ma si é accorto che non era marmellata ma me**a e ora pretente l'aiuto di quelli che ha sempre mazziato, peraltro minacciando chi non va ad aiutarlo.
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@ipd @jalefkowit yeah the street flooded and then half-froze and it's snowing again
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@aeva @jalefkowit in a residential wood timbered thing, i think the recommendation is under your kitchen table if it is strong. whatever gets you away from glass is usually good too. your house getting picked up and whisked away isn’t really what you are trying to protect from, its cuts and bumps from flying debris
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Have you looked out the window today?
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@aeva I am super out of practice with this but having lived in a mobile home in North Dakota for a while as a kid- during watch you need to check if the local shelter is open (in our case the trailer park manager's basement), crack open the windows and unplug unneeded electrical appliances and at warning if you could, go to the shelter, if not, sit in the bathtub. I have no idea these days if most of that was actually useful information.
@jalefkowit good luck, that is no fun at all!
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@jalefkowit good luck and god speed
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Abraham Wald would like a word...
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Cosa può offrire l'Europa agli USA, se non obbedienza?
Cosa ha da offrire l'Europa all'Iran se non obbedienza agli USA e la propria irrilevanza?
Così mi chiedo quali possibilità ha l'Europa di intervenire con la diplomazia, se non ha niente da offrire
