Products > Test Equipment
Floating Scopes
serggio:
--- Quote from: Red Squirrel on June 27, 2017, 09:19:59 pm ---Idealy, what would be a good solution is a battery operated scope. Suppose one could run a scope off an inverter with battery pack for doing isolated tests.
--- End quote ---
It would not be good and safe solution till user will not understand dangerous from touching open circuit parts of high voltage scheme/open test and measurement equipment parts connected to this this scheme or ever unprotected parts of leads this equipment.
Battery operated scope this is not panacea from potential danger of high voltage injury, because at this scope can be connected probes with open ground contact at the end.
Battery operated scope only suitable for floating measurement with no damage scope itself (no short circuit thru the scope).
But this is not safe at all.
--- Quote from: tronde on June 27, 2017, 09:36:06 pm ---Something battery powered with bluetooth could be useful. Does USB to bluetooth adapters exist?
--- End quote ---
So many solutions.... What you need exactly?
tronde:
--- Quote from: serggio on June 27, 2017, 09:53:01 pm ---
--- Quote from: tronde on June 27, 2017, 09:36:06 pm ---Something battery powered with bluetooth could be useful. Does USB to bluetooth adapters exist?
--- End quote ---
So many solutions.... What you need exactly?
--- End quote ---
Something that could transform a USB scope into wireless. A battery powered Bluetooth or WiFi scope could be really useful for mains work.
timb:
--- Quote from: IanMacdonald on June 27, 2017, 08:50:25 pm ---"Tektronix was still selling the A6901 Ground Isolation Monitor in 1991 although it only allows floating an oscilloscope or other test instrument to 40 volts. I have noticed before that where manufacturers bothered to specify it, the floating voltage specification is usually 40 to 50 volts and I wonder where that number comes from over such a long period of time. It is suspiciously close to the common definition of the maximum of 'low voltage'. "
I recall that device, and thinking what an incredibly dangerous gadget it was. It gave the impression that the 'scope was isolated, but had the operator held a probe outer and touched a live terminal, once 50V appeared on the scope it would then have proceeded to complete the circuit and electrocute him. :palm:
--- End quote ---
It also monitored current across the ground connection and, if it exceeded a set amount (0.5, 3.5 or 5ma), would completely sever the connection by opening the L-N-G relay. (Not unlike a GFCI.)
They were actually pretty cool little devices.
tautech:
The first few minutes of this recently posted vid (Pt 2) properly examines the use of an isolated channel HH scope and when there is need to use some form of channel isolation or using 2 channels and differential measurement won't work.
https://youtu.be/rNElNKeDNyg
From this thread:
https://www.eevblog.com/forum/testgear/review-siglent-shs-1602-isolated-scopemeter/
tronde:
--- Quote from: timb on June 27, 2017, 10:42:32 pm ---
--- Quote from: IanMacdonald on June 27, 2017, 08:50:25 pm ---"Tektronix was still selling the A6901 Ground Isolation Monitor in 1991 although it only allows floating an oscilloscope or other test instrument to 40 volts. I have noticed before that where manufacturers bothered to specify it, the floating voltage specification is usually 40 to 50 volts and I wonder where that number comes from over such a long period of time. It is suspiciously close to the common definition of the maximum of 'low voltage'. "
I recall that device, and thinking what an incredibly dangerous gadget it was. It gave the impression that the 'scope was isolated, but had the operator held a probe outer and touched a live terminal, once 50V appeared on the scope it would then have proceeded to complete the circuit and electrocute him. :palm:
--- End quote ---
It also monitored current across the ground connection and, if it exceeded a set amount (0.5, 3.5 or 5ma), would completely sever the connection by opening the L-N-G relay. (Not unlike a GFCI.)
They were actually pretty cool little devices.
--- End quote ---
User manual and schematics here
http://w140.com/tekwiki/wiki/A6901
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version