Products > Test Equipment
Siglent SDS804/814X HD or Rigol HDO914S for Mechatronics student
Jack359:
--- Quote from: Antonio90 on September 25, 2024, 07:48:30 pm ---The dangerous voltages come from outside the oscilloscope, DSOs which connect directly to mains have a similar PSU on the inside.
If you only work with low voltages and isolated circuits, maybe, but really, just ground your oscilloscope.
You will have time later on to float it perfectly knowing that you should not do it in most cases.
--- End quote ---
:-+ Last question - if I buy suitable powerbank then as far as I understand operating this scope won't be much different than tablet scope like this one https://www.micsig.com/product5/?
I know that it has less memory and miss some other not important things for me.
As I read the micsig also uses common ground and doesn't have isolated channels.
tautech:
--- Quote from: Jack359 on September 25, 2024, 07:28:13 pm --- Is it still as potentially deadly when floating?
--- End quote ---
You said in the OP:
--- Quote ---I'm starting my Bachelor in Mechatronics so I would like to have a nice private oscilloscope.
--- End quote ---
At this point your knowledge is much lacking.
The industry now severely frowns on floating scopes and Differential probes have especially been developed to remove the need to engage in this dangerous practise.
Okay so you brought your first scope, but think of that like buying a car with a tow hitch, it will get you where you need to go but additional expenditure is required to make full use of it.
The world of Differential and Current probes awaits you.
Antonio90:
Micsig has a grounding plug too, which should be connected for general purpose bench use. It can be floated easily and can be battery operated. There are also quite a few handhelds which are naturally floating, but also designed to work like that.
However, I can't really tell you it is fine to float your bench scope. It's a liability and an accident waiting to happen for a beginner. You'll probably have better judgement than me on this regard when you complete your degree, but right now, I really advise you to ground your new scope.
Fungus:
--- Quote from: Jack359 on September 25, 2024, 04:28:11 pm ---In it is mentioned that not grounding the oscilloscope is actually workaround if I want to measure grounded circuits but it is not recommended. Didn't get why..
--- End quote ---
Because there's exposed metal on the 'scope (eg. BNC connectors) that are directly connected to the probe. Connect your the probe to a live wire? Those BNC connectors are now live.
The 'scope will be OK with that, the danger is to you if you touch them.
Grounding the 'scope avoids that. There's no way the BNC connectors can kill you if they're grounded. You can still kill yourself in other ways but the BNCs are safe to touch.
--- Quote from: Antonio90 on September 25, 2024, 09:01:49 pm ---Micsig has a grounding plug too, which should be connected for general purpose bench use.
--- End quote ---
Or... just don't poke at mains electricity with it.
There's no need.
Antonio90:
--- Quote from: Fungus on September 26, 2024, 01:46:33 am ---
--- Quote from: Jack359 on September 25, 2024, 04:28:11 pm ---In it is mentioned that not grounding the oscilloscope is actually workaround if I want to measure grounded circuits but it is not recommended. Didn't get why..
--- End quote ---
Because there's exposed metal on the 'scope (eg. BNC connectors) that are directly connected to the probe. Connect your the probe to a live wire? Those BNC connectors are now live.
The 'scope will be OK with that, the danger is to you if you touch them.
Grounding the 'scope avoids that. There's no way the BNC connectors can kill you if they're grounded. You can still kill yourself in other ways but the BNCs are safe to touch.
--- Quote from: Antonio90 on September 25, 2024, 09:01:49 pm ---Micsig has a grounding plug too, which should be connected for general purpose bench use.
--- End quote ---
Or... just don't poke at mains electricity with it.
There's no need.
--- End quote ---
Sure, there won't be dangerous voltages on the scope if you don't probe dangerous voltages. I'm just not so sure it is prudent to asume a newbie will never probe any dangerous voltage, even if that's not the intended initial use.
I talk from experience. Even though the plan is to stick with op-amps, a few transistors, a motor from time to time and small radio stuff, you will inevitably find something for "parts or repair" for free or too good of a price to let it pass, and start trying to repair it. Often without an isolation transformer. Maybe not, and old Tek and HP stuff is not available, expensive, or plainly uninteresting for the OP.
I stick with what I said, until he has his own criteria and doesn't need to ask.
But yeah, a 5V arduino board with 12V relays and a few sensors is not deadly, grounded scope or not.
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