Smexoscope analog ac dc oscilloscope
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For this task at a pinch you can use a fast opto isolator in analog mode attached across the drive as done in many Isolated PSU's. Measuring the high side gate drive voltage is the hardest part but surely not to complex, because it is a low Z measurement, since any useful FET will have a large input capacitance so gate drive will be of the order of a couple amps and 10’s of volts at < 1 MHz. Simple way to measure Current through the H-Bridge Fets is to measure temperature which can be done easily enough with relevant temperature IC, then do some Maths Anything higher and you will be driving the H-bridge as an analog amplifier.
SMEXOSCOPE ANALOG AC DC OSCILLOSCOPE CRACK
Hmm regarding the original task, is this not a classic hi tech sledgehammer to crack a nut? Or alternatively since this is Hackaday, could we not get something satisfactory using much more low tech hardware?įirstly for the motor we are surely talking about relatively slow PWM signals of the order of 10 kHz – 1 Mhz. The scopes with good LCDs, original safety probes, and the battery, charger base, and wall wart are the ones that will hit the $500 or more price. I personally don’t want to trust myself to remember to not touch the connectors while in use so I want the original probes. I often see these scopes on eBay sold with other random probes with metal BNC connectors, which should operate fine and not shock you as long as you don’t connect your ground to a high voltage then touch the BNC connectors.
![smexoscope analog ac dc oscilloscope smexoscope analog ac dc oscilloscope](https://abra-electronics.com/images/detailed/71/S-1330__05820.jpg)
Because the scope isn’t connected to a safety ground, they didn’t want any exposed metal that could be at some high voltage that your scope probe ground is connected to. They were special probes with no exposed metal on the BNC connectors. The other thing to watch for is that they come with the original scope probes. Probably doable for the type of person that reads Hackaday and uses oscilloscopes. Or you can pull the LCD out, take it apart, strip the polarizer sheet off, clean the glass, and apply a new polarizer sheet you can buy online for like $5. Replacement LCDs usually cost about $150. Apparently the polarizer sheet on the front somehow goes bad.
![smexoscope analog ac dc oscilloscope smexoscope analog ac dc oscilloscope](https://cdn.gemtracks.com/img/1643-smexoscope-by-smart-electronix.jpg)
The contrast gets so bad you can’t see an image. I’ve been watching eBay for these recently. Posted in hardware Tagged design, digital Oscilloscope, isolated Post navigation
SMEXOSCOPE ANALOG AC DC OSCILLOSCOPE SERIAL
Need a high current probe as well? we’ve got you covered, and since we’re on the subject of isolation, how’s about an isolated USB serial board to keep your laptop safe? illustrates numerous problems along the way, just to illustrate that building something like this doesn’t always work the first way you try. The data are sucked out of the ADC via a pair of 4.375 Gbps compressed serial lanes, according to JESD204B, using custom made fibre-optic link modules. The frontend needs power, so this is fed-forward via a beautifully designed bifilar wound toroidal transformer, which is a whole story in itself. The real trouble with building a multichannel isolated instrument of this nature lies in the isolation from the frontend to the common backend. There is much to learn from journey, for example, where to place the frontend ADC? Isolated side or not? The noise floor of the signal chain dictated the former. That all said, it’s not the existence of the scope that is the focus here, it’s the journey from problem to solution that interests us the most. Also, don’t reach for your wallets just yet, as this is a specialised instrument with an even smaller potential user base than a normal scope, so these units are rather pricey. It does however have some niceties such as an extra eight 100 Mbps digital inputs and a handy 65 MHz signal generator. The scope itself is specification-wise nothing too flash, it’s the isolated channels that make it special.
![smexoscope analog ac dc oscilloscope smexoscope analog ac dc oscilloscope](https://integraudio.com/wp-content/uploads/2021/08/trjrj.jpg)
The solution to the issue was obvious, build your own isolated high voltage oscilloscope, and here is the Cleverscope CS448 development journey for your viewing pleasure. Then there’s the fact that the motors run at many hundreds of volts, and the prospect of probing that with your precious bench instrument is a little nerve-wracking to say the least. The average scope on your bench however, definitely is ground-referenced, so visualising such waveforms is a bit of a faff. This is due to the three phase nature of such motors being driven with three current waveforms, out of phase with each other by 120 degrees, where current flows between each pair of winding taps, without being referenced to a common notion of ground. Was busy designing high voltage variable speed motor drives and was lamenting the inability of a standard scope to visualise the waveforms around the switch transistors.