Products > Test Equipment
Choosing a ~$10K MSO (Keysight 3000G, LeCroy 4000HD, Tek MSO34, R&S ??)
tooki:
--- Quote from: 2N3055 on November 05, 2023, 11:27:32 pm ---Current probes, high voltage diff probes, or even a high impedance low capacitance single ended active probe. If you need to work of wide number of different devices it gets interesting sometimes..
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I believe it. But again hard to predict what will actually be needed. :/
I know that “generic” current probes and HV differential probes are readily available. Not so much for active probes, correct?
tooki:
I will add that investigating these scopes has a) taught me a lot about oscilloscopes, and b) showed me just how much I have yet to learn about oscilloscopes! :p
Also, this is what the loaner scopes looked like in the storage cabinet. ;D
nctnico:
--- Quote from: tooki on November 05, 2023, 11:30:49 pm ---
--- Quote from: nctnico on November 05, 2023, 11:12:07 pm ---
--- Quote from: tooki on November 05, 2023, 06:10:40 pm ---Am I giving too much weight to having digital inputs?
Would that be better spent on a separate USB logic analyzer like a Saleae or Analog Discovery?
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There can be a lot of heated debate around this but in the end you are the one who knows best what kind of projects you get on your desk. Personally I like to have digital channels on a DSO in order to use it as a general purpose logic analyser / correlating digital signals with analog signals. The biggest advantage is that an oscilloscope is already on your desk and hooking up signals is easy. So no need to pull a computer screen + mouse + keyboard near the already crowded working area.
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Yeah, unfortunately I just haven’t been in this position long enough to have a really good idea of what kinds of projects I’ll have, hence the nebulous requirements. What I’ve done so far is all stuff that would be easily handled by a $400 Rigol, but the laser labs full of expensive, fast pulse generation and detection gear, and the little bit I’ve been told about the one prof’s own boards, makes me fairly certain that wouldn’t suffice forever. But I also am reasonably certain that massive bandwidth isn’t needed either, it being my understanding that the 2.5GHz WaveRunner was acquired at a steeeeeep discount, far exceeding actual requirements.
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At least the signal analysis needs will be covered by that oscilloscope so you won't have to concentrate too much on that on your new purchase. There is not a single oscilloscope which is perfect for all situations.
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--- Quote from: nctnico on November 05, 2023, 11:12:07 pm ---Another question is whether a generic USB logic analyser is a good alternative to a dedicated protocol analyser. For example: When I need to deal with a CAN bus, I typically use a dedicated CAN bus dongle together with software which can capture, analyse and save all data. Ofcourse decoding is still usefull up to a certain amount of data but a CAN bus generally has a huge amount of data being repeated so memory fills up fast with useless data.
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What kind of interface would you recommend?
One PhD student I’m doing a project for would love to do some CAN bus reverse engineering (since Agilent doesn’t document their command protocol).
Is the dedicated interface you’re thinking of analogous to, for example, the Aardvark for I2C?
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I'm not familiar with the Aardvark. Rings a faint bell though. For CAN I'm using Lawicel CAN-USB dongle and CAN monitor pro software. The software is sold seperately. IIRC I got these from Antratek.
Martin72:
@Tooki: A nice selection....
--- Quote ---I know that “generic” current probes and HV differential probes are readily available. Not so much for active probes, correct?
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Yepp, hard to find, only elder used ones.
For current probes, I wanted to move away from the lecroy probus system in order to become independent of it in the test field.
It is no secret that Hioki manufactures such probes for almost all brands and the ones for Siglent can actually be used universally for all scopes.
With the same technical properties.
And they cost just under 6000€...
tautech:
--- Quote from: tooki on November 05, 2023, 11:02:01 pm ---
--- Quote from: Someone on November 05, 2023, 10:18:02 pm ---
--- Quote from: nctnico on November 05, 2023, 09:18:40 pm ---Lecroys typically can't zoom out which is something that is super handy for doing embedded development work.
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And the scopes discussed have several other ways to achieve the same result. In many ways the more flexible windows/views of the Lecroy where the user can freely define the split between the views is far and away more useful than your hacky "zoom out", which while it may fit your construed workflow does not naturally make sense.
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Bear in mind that the WaveSurfer models can’t do this with anywhere near the flexibility of the WaveRunners.
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Yeah much has been made of this by folks that can't get their head around another way of doing the same thing.
It suits some and not others but scopes at the level you are looking at offer Mem management options thereby pleasing all.
Key is mem depth providing orders of magnitude better zoom out capability than some of the so-called A brands.
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