There must be some calibration coefficients being computed. I wonder if they're stored in the probe, or in the oscilloscope? The latter would only require the probe to deliver a unique serial number. Seems like the obvious next step is to fabricate some sort of fixture to give access to the extra pin on the BNC connectors and use another scope to monitor the funny business going on.
some kind of one-wire protocol? there's a microcontroller in them thar probe I betcha! although maybe it would be too noisy. I retract my guess, tentatively. But it would be interesting to know how they're doing it.
It might be interesting in how far the the probe gets mis-calibrated when you connect additional 4pF to the probe during calibration. But maybe it is ok as it just takes to long to explore.
Very interesting, my guess is there's a credit card style near field chip in the probe assembly that tells the scope what's connected, I'm open to correction.
![DDG & G Herbo - Nosey [Official Video]](http://i.ytimg.com/vi/I9Ra0Zc2NlQ/mqdefault.jpg)
Looks to me like there's an indexing pin on the BNC connector. Couldn't that be what triggers the auto-identification?
There must be some calibration coefficients being computed. I wonder if they're stored in the probe, or in the oscilloscope? The latter would only require the probe to deliver a unique serial number. Seems like the obvious next step is to fabricate some sort of fixture to give access to the extra pin on the BNC connectors and use another scope to monitor the funny business going on.
some kind of one-wire protocol? there's a microcontroller in them thar probe I betcha! although maybe it would be too noisy. I retract my guess, tentatively. But it would be interesting to know how they're doing it.
It might be interesting in how far the the probe gets mis-calibrated when you connect additional 4pF to the probe during calibration. But maybe it is ok as it just takes to long to explore.
Very interesting, my guess is there's a credit card style near field chip in the probe assembly that tells the scope what's connected, I'm open to correction.