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| Brymen BM789 |
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| 2N3055:
--- Quote from: Neutrion on September 24, 2021, 11:22:19 am --- I had no idea, but than I am also not an experienced engineer. I think with a lots of motors everywhere using inverters, this problem will pose more problems in the future than before. --- End quote --- Well, I don't think measuring milivolts and measuring VFD connected equipment have anything in common. |
| Neutrion:
Charging up the meter tipically occurs at V AC in Brymen and both mV and VAC in Fluke it seems. So I was not talking about the missing overrange indication on the Brymen. |
| joeqsmith:
--- Quote from: Neutrion on September 24, 2021, 11:22:19 am ---... so I was wondering whether the sinewave might got too high frequency. --- End quote --- All of those were done using a 60Hz sinewave. --- Quote from: 2N3055 on September 24, 2021, 12:16:12 pm --- --- Quote from: Neutrion on September 24, 2021, 11:22:19 am --- I had no idea, but than I am also not an experienced engineer. I think with a lots of motors everywhere using inverters, this problem will pose more problems in the future than before. --- End quote --- Well, I don't think measuring milivolts and measuring VFD connected equipment have anything in common. --- End quote --- I've never really given it any thought. When I use an external block, out of habit I will discharge it. When working above 24V I tend to take more precautions. Much of the time when I need a meter, I am not using the AC modes. Normally I'm not working on a mix of technologies at the same time where the internal block would even come into play. If I am troubleshooting power electronics, I normally start with it unpowered. When I get to where I am starting to bring it up, I am using a scope. For logic, I'm using PC/JTAG, scope, LA. So, I doubt I will go out of my way to change any habits but it's certainly something to be aware of. Now, could Dave's 121GW diode test take out a sensitive device? |
| 2N3055:
--- Quote from: joeqsmith on September 24, 2021, 12:39:34 pm --- --- Quote from: Neutrion on September 24, 2021, 11:22:19 am ---... so I was wondering whether the sinewave might got too high frequency. --- End quote --- All of those were done using a 60Hz sinewave. --- Quote from: 2N3055 on September 24, 2021, 12:16:12 pm --- --- Quote from: Neutrion on September 24, 2021, 11:22:19 am --- I had no idea, but than I am also not an experienced engineer. I think with a lots of motors everywhere using inverters, this problem will pose more problems in the future than before. --- End quote --- Well, I don't think measuring milivolts and measuring VFD connected equipment have anything in common. --- End quote --- I've never really given it any thought. When I use an external block, out of habit I will discharge it. When working above 24V I tend to take more precautions. Much of the time when I need a meter, I am not using the AC modes. Normally I'm not working on a mix of technologies at the same time where the internal block would even come into play. If I am troubleshooting power electronics, I normally start with it unpowered. When I get to where I am starting to bring it up, I am using a scope. For logic, I'm using PC/JTAG, scope, LA. So, I doubt I will go out of my way to change any habits but it's certainly something to be aware of. Now, could Dave's 121GW diode test take out a sensitive device? --- End quote --- Agree.. Usual process is systematic, and there is a natural progression how one goes about troubleshooting things. As for 121GW I don't know, but MTX3293 has 26V/10mA range in diode measurements. I'm sure there are many sensitive devices that could be damaged by it. |
| Neutrion:
But than also designing your own thing, and knowing all the guts of it (I suppose you Joe mostly design stuff) makes you to to take different measures than starting to measure around in something which you have not much idea about, maybe not even a schematics is aviable. And there could be also some hazardous failure modes, which in theory should not happen but they do sometimes. Can any of you also bring the 869 to show 0 Volts with a dc offset? Though there with the dual display less of an issue. |
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