Products > Test Equipment

scope differential probes

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tggzzz:

--- Quote from: tautech on October 13, 2023, 09:51:22 pm ---
--- Quote from: robint on October 13, 2023, 09:46:56 pm ---Is this a techie solution? |O

--- End quote ---
Half arsed, yes.
But it only offers 1 isolated channel from PE as all BNC's shells share a common connection.

--- End quote ---

Yup.

And if a probe shield is connected to an "unfortunate" voltage, that voltage will materialise throughout the scope and its case. Then the operator attaches/removes a probe from the scope, or uses the touchscreen or membrane button or similar, and...

As for the UUT, it may not appreciate a large capacitance to ground appearing on one of its nodes, and oscillation or delayed switch on/off may occur with "interesting" consequences.

tautech:

--- Quote from: tggzzz on October 13, 2023, 10:02:57 pm ---
--- Quote from: tautech on October 13, 2023, 09:51:22 pm ---
--- Quote from: robint on October 13, 2023, 09:46:56 pm ---Is this a techie solution? |O

--- End quote ---
Half arsed, yes.
But it only offers 1 isolated channel from PE as all BNC's shells share a common connection.

--- End quote ---

Yup.

And if a probe shield is connected to an "unfortunate" voltage, that voltage will materialise throughout the scope and its case. Then the operator attaches/removes a probe from the scope, or uses the touchscreen or membrane button or similar, and...

--- End quote ---
Exactly, added with an edit while you were typing.

Again we have these threads about differential probe cost and need when there is a real need for operator safety when they don't fully understand the risks.
To address this basic need we stock the well known and well priced DP-25 which while not impressively spec'd suits most requirements.

tggzzz:

--- Quote from: tautech on October 13, 2023, 10:09:36 pm ---
--- Quote from: tggzzz on October 13, 2023, 10:02:57 pm ---
--- Quote from: tautech on October 13, 2023, 09:51:22 pm ---
--- Quote from: robint on October 13, 2023, 09:46:56 pm ---Is this a techie solution? |O

--- End quote ---
Half arsed, yes.
But it only offers 1 isolated channel from PE as all BNC's shells share a common connection.

--- End quote ---

Yup.

And if a probe shield is connected to an "unfortunate" voltage, that voltage will materialise throughout the scope and its case. Then the operator attaches/removes a probe from the scope, or uses the touchscreen or membrane button or similar, and...

--- End quote ---
Exactly, added with an edit while you were typing.

--- End quote ---

Messages crossing in the æther is a standard problem. It was worse (w.r.t. UK and Australia) before we used the æther for messages :)


--- Quote ---Again we have these threads about differential probe cost and need when there is a real need for operator safety when they don't fully understand the risks.
To address this basic need we stock the well known and well priced DP-25 which while not impressively spec'd suits most requirements.

--- End quote ---

Yup. Such as https://www.eevblog.com/forum/projects/your-test-equipments-**oscilliscope**-very-best-friend/msg4712102/#msg4712102

But there are the Tek A6902 probes for people that need a couple of isolated channels. Some variants come with standard probes, some with impressively chunky (?manly?) probes.

I ilke to point out the kinds of precautions you need to take to float a scope that wasn't designed to be floated, e.g.


JeremyC:

--- Quote from: robint on October 13, 2023, 05:37:21 am ---So I came to the area of Differential probes and was shocked to discover that they can cost nearly as much as my new DSO.

--- End quote ---

You should check the DP differential probes from Miscig, on Amazon US they cost ~$190.
https://www.micsig.com/Differential%20Probe04/

robint:
Yes Gents
The bottom line is that these diff probes cost ca £200, just so you can poke around some live DUT  - and - at that price if I needed to do that then clearly it would be better to buy a separate standalone battery operated DSO Nano - I bought one couple years back ca £50, ok for poking around a SMPS - it does the job.

I think if I really needed to expose myself and my precious Rigol  :-* then I could power it from my existing standby  Battery/inverter system which might give me a days work/ charge overnight.  Yes a much derided floating scope but the safety issue seems well over blown here (commercial opinions selling). A knowledgeable Tech worth his salt would know
the risks and precautions.  This board is after all for those with some electrical schooling  :clap:


Posted by: jonpaul
« on: Yesterday at 08:42:07 pm »

he has the solution so many thanks JP  and Ive learnt so much that I was quite unaware https://w140.com/tekwiki/images/1/19/062-1120-00.pdf.
You could spend 200hrs theory/lab work in a Uni course just to cover all the issues raised.  So I now know what I dont know :phew:

I'm a city shopping car type not a 1000hp EVcar boy racer. Hi spec hi cost solutions are not my bag.
My Rigol has catapulted me from a prewar Austin 7 to a Toyota Aygo (lovely little mover btw)

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