Floating the 'scope
in [Basics]
|
Prev: Be ready to be killed, or take action to stop the global suicide. Scandal at CERN.
Next: Laminar Flow @ Terminal Velocity: The Perfect Suspension for Magnetic Fibers
From: Hammy on 6 Mar 2010 07:03 On 6 Mar 2010 03:09:01 -0600, The Phantom <phantom(a)aol.com> wrote: > >Tektronix has probes designed to solve these problems: > >http://www2.tek.com/cmswpt/psdetails.lotr?ct=PS&cs=psu&ci=13471&lc=EN > >They are specifically intended for floating use with the TPS2000 series scopes, >which, as John mentioned, have true isolated inputs. > >Or, you can use these probes with an ordinary scope: > >http://www2.tek.com/cmswpt/psdetails.lotr?ct=PS&cs=psu&ci=13415&lc=EN > Those are nice expensive but nice. You should use an isolation transformer on any line powered device your testing. You can usually find a 500VA one for under 100 bucks. I got a TEMA 500VA one for 45 bucks from Newark. Well worth the money. Its not really a good idea to float your scope.
From: Hammy on 6 Mar 2010 07:17 On Sat, 06 Mar 2010 07:03:56 -0500, Hammy <spam(a)spam.com> wrote: >On 6 Mar 2010 03:09:01 -0600, The Phantom <phantom(a)aol.com> wrote: > > >> >>Tektronix has probes designed to solve these problems: >> >>http://www2.tek.com/cmswpt/psdetails.lotr?ct=PS&cs=psu&ci=13471&lc=EN >> >>They are specifically intended for floating use with the TPS2000 series scopes, >>which, as John mentioned, have true isolated inputs. >> >>Or, you can use these probes with an ordinary scope: >> >>http://www2.tek.com/cmswpt/psdetails.lotr?ct=PS&cs=psu&ci=13415&lc=EN >> >Those are nice expensive but nice. > >You should use an isolation transformer on any line powered device >your testing. You can usually find a 500VA one for under 100 bucks. I >got a TEMA 500VA one for 45 bucks from Newark. Well worth the money. > > Its not really a good idea to float your scope. Anyone use any of PICO's differntial probes? This ones only $350.00 Canadian. http://canada.newark.com/pico-technology/oscilloscope-x10-x100/active-differential-oscilloscope/dp/02M0836
From: John Tserkezis on 6 Mar 2010 07:22 On 6/03/2010 11:03 PM, Hammy wrote: > You should use an isolation transformer on any line powered device > your testing. You can usually find a 500VA one for under 100 bucks. I > got a TEMA 500VA one for 45 bucks from Newark. Well worth the money. > Its not really a good idea to float your scope. Unfortunately, it was the cost of the transformer that makes people do things like float their scopes. "It does the same job, and it's a lot cheaper". Till someone dies. How much does liability cost?
From: Hammy on 6 Mar 2010 07:58 On Sat, 06 Mar 2010 23:22:59 +1100, John Tserkezis <jt(a)techniciansyndrome.org.invalid> wrote: >On 6/03/2010 11:03 PM, Hammy wrote: > >> You should use an isolation transformer on any line powered device >> your testing. You can usually find a 500VA one for under 100 bucks. I >> got a TEMA 500VA one for 45 bucks from Newark. Well worth the money. >> Its not really a good idea to float your scope. > > Unfortunately, it was the cost of the transformer that makes people do >things like float their scopes. > > "It does the same job, and it's a lot cheaper". > Till someone dies. How much does liability cost? Well the one I paid $45 on sale last year is still only $70. Cheaper then a new scope or a funeral.;-) http://canada.newark.com/tenma/72-6670/isolation-transformer/dp/97C7982 If you look around there's usually always a decent one for under $100.
From: Phil Allison on 6 Mar 2010 11:01
"Hammy" > > You should use an isolation transformer on any line powered device > your testing. ** Another recipe for dead technicians. The horrendous fallacy in the thinking is way beyond the likes of retards like Hammy. ...... Phil |