Amazing! How would anyone go about making a diy version of an optically isolated probe, both on signal and power side? If not the full cable length opto isolation, then perhaps with optoisolators?
Amazing! How would anyone go about making a diy version of an optically isolated probe, both on signal and power side? If not the full cable length opto isolation, then perhaps with optoisolators?I was searching for it, but, the thread is gone.
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Was it a loaner and they did not want you taking it apart? It would be cool to see the insides where the magic happens.
Are we going to get a teardown? The probe is quite interesting.
Amazing! How would anyone go about making a diy version of an optically isolated probe, both on signal and power side? If not the full cable length opto isolation, then perhaps with optoisolators?
[...] How do they convert the light to power at the other end?
How do they convert the light to power at the other end?
How do they convert the light to power at the other end?
A photo diode can do that.
I forgot where I saw them, but there were internal photos of the saker fiber isolated probes somewhere https://saker-mv.com/fiber-isolated-voltage-probe/ .The optics package does not look too complicated, and at least for the Saker probe it looks like they are directly modulating a led / laser diode..
How do they convert the light to power at the other end?
A photo diode can do that.
Amazing! How would anyone go about making a diy version of an optically isolated probe, both on signal and power side? If not the full cable length opto isolation, then perhaps with optoisolators?
Amazing! How would anyone go about making a diy version of an optically isolated probe, both on signal and power side? If not the full cable length opto isolation, then perhaps with optoisolators?I vaguely remember seeing a Linear technology application note. It was about making linear characteristics for an optocouple. So they had an equal optocouple in the feedback, and it was used on the transmit side to correct for any nonlinear characteristics. I don't know how linear optical cables and fiber optic transmitters are, but that's one way of doing it. Or maybe they are doing it completely differently, since 10Gb and even 100Gb optical networks existed or a while, they might just send it all digital.
You can probably get a long way using a battery and SFP + FPGA + ADC / DAC
Amazing! How would anyone go about making a diy version of an optically isolated probe, both on signal and power side? If not the full cable length opto isolation, then perhaps with optoisolators?I vaguely remember seeing a Linear technology application note. It was about making linear characteristics for an optocouple. So they had an equal optocouple in the feedback, and it was used on the transmit side to correct for any nonlinear characteristics. I don't know how linear optical cables and fiber optic transmitters are, but that's one way of doing it. Or maybe they are doing it completely differently, since 10Gb and even 100Gb optical networks existed or a while, they might just send it all digital.I've worked on such a device a decade ago. The entire acquisition system (battery powered) is connected using an optical (ethernet) network link and the data is send pre-formatted over the network. But this is for use in high voltage labs where they use it to measure into the MVolt / tens of kAmpere range and float the units to tens of kVolt.
The biggest trick is to get this techology to become cheap. You can probably get a long way using a battery and SFP + FPGA + ADC / DAC
I don't see how going entirely digital would ever allow a cheap hobbyist grade product at 100 MHz. Two path is an option and would make calibration easy, digital/PWM for LF (across a separate fiber) and direct amplitude modulation of laser current for HF.