Andy,
It¡¯s this model (excstly) :
Originally they came with just one probe and nothing else. ?Now they include second probe as well as few other accessories. ? Those other accessories doesn¡¯t have insulated plastic cover over the BNC twist cover. ? That seems to be a weak point
(having metal exposed for operator¡¯s touch).
The BNC connector on the scope itself is recessed so that if 2 probes are connected, then it¡¯s actually harder to touch the exposed metal connector.
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What do you think about them as test devices for mains voltage ?
Jong?
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On Dec 9, 2024, at 11:21 AM, Andy via groups.io <ai.egrps@...> wrote:
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On Mon, Dec 9, 2024 at 12:58 PM, jong kung wrote:
¡. What is the industry opinion on using a portable ?/ floating (DMM style) scopes on mains voltage ?? ? Is it considered just as safe as using HV differential probes ??
That seems like a very VERY bad idea!? As in, a severe safety hazard.
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But I may not fully understand what you are asking.
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To me, DMM style implies having no metal on the instrument'that the user can touch.? That is probably OK.? Does your battery-operated scope have any touchable metal, anywhere?? If yes, then it's a hazard.? The scope's common could be 'hot'.
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Or are you suggesting letting the scope's common float (literally not connected to anything) and just connecting the two channel's inputs as if they were one differential input, letting the scope perform a subtraction?? That
might work in theory, but I would not expect good results.? OTOH, safety-wise it is not good because there is capacitance from both inputs to scope common, and this makes the scope's metal float at 0.5 * the
mains voltage.? NOT good.
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Andy
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