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| Oscilloscope for AC work ? |
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| BravoV:
--- Quote from: DDunfield on May 05, 2019, 01:04:31 pm ---An HV rated portable scope is as suited to probing high voltages as an HV rated differential probe. In most industrial cases the battery scope is the better solution. ...<snip>... This setup doesn't work on a job site. I suppose you *could* ... <snip> ... I suppose you *could* ... <snip> ... I suppose you *could* ... <snip> ... --- End quote --- Dave, nothing against your post there, infact I do own a Tektronix THS710A, apart from that clumsy DS1054Z bench scope + HV diff. probe. :P Its just my response to OP which I see he just started on this matter, and there is nothing wrong on a bit cautious at spending big bucks, especially at early stage in venturing in this HV probing domain. Looking at current HV diff. probe's price, imho, is an ideal starting point, rather than have to jump directly buying an expensive "decent" handheld HV isolated scope. |
| DDunfield:
--- Quote from: BravoV on May 05, 2019, 01:36:12 pm --- --- Quote from: DDunfield on May 05, 2019, 01:04:31 pm ---An HV rated portable scope is as suited to probing high voltages as an HV rated differential probe. In most industrial cases the battery scope is the better solution. ...<snip>... This setup doesn't work on a job site. I suppose you *could* ... <snip> ... ...x3 --- End quote --- Dave, nothing against your post there, infact I do own a Tektronix THS710A, apart from that clumsy DS1054Z bench scope + HV diff. probe. :P Its just my response to OP which I see he just started on this matter, and there is nothing wrong on a bit cautious at spending big bucks, especially at early stage in venturing in this HV probing domain. Looking at current HV diff. probe's price, imho, is an ideal starting point, rather than have to jump directly buying an expensive "decent" handheld HV isolated scope. --- End quote --- Fair enough, and I'm not saying it can't be done that way, or even that you would never do it that way "If you're doing it once (or very infrequently) you might make due like MacGyver." But what I am trying to do is counter the arguments that battery-powered scopes should not be considered, and that benchtop devices are better. In most industrial/on-site situations the opposite is more true. I don't know the details of the OP's setup, however the original post mentions, VFDs (plural), 125A feeds, and 3-phase. This suggests to me that it is an industrial application and that they do not bring in someone properly equipped to monitor/maintain it. I could be wrong. Perhaps it is a lab environment (*1). But I think it inadvisable to make general statements that benchtop scopes with HV-diff probes are better for mains/power work than the tools professionals in the field use every day. (*1) some years ago I was developing control systems for wind turbines. Mostly smallish, IIRC the biggest was 50kw. We did have a lab with among other things captive turbine heads driven by honkin big motors on VFDs. These were primarily used for developing/testing the regulation sub-systems. The heads produce 600v 3-phase. In the lab, I did in fact use benchtop scopes and HV-diff probes. That was because the high-power systems were actually on (or at least beside) my bench. I never took (or saw taken) a benchtop scope to the test rigs, or on site visits - there we used battery powered scopemeters. Dave |
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