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Yes this is my thought too
The isolators provide reinforced isolation to 300Vrms
Would it be feasible to state something like;
“Up to max 300Vrms CAT III, or max 600V CAT III providing instrument is safety earthed via supplied earth connection to terminal X”.
This would be on the display...
The ground terminal will be on the exposed metal parts not the plastic case. As I mentioned, the main case is plastic… but there are also exposed metal parts which I will mount onto a metal plate so that it can all be bonded together.
This isn’t a truly double insulated product … even those...
Bear in mind while this can be moved around and battery powered, it’s still intended to be used on a Laboratory bench….
So I was hoping to use the same approach as some voltage probes use which stipulate that the protective earth needs to be connected to use in a CATII environment
95% of use...
Hi all
I am designing an isolated voltage channel within a portable product (a high end portable DMM) which I require 1000V CATII and 600V CATIII rating on the measurement inputs
I am designing to IEC61010.
The product is powered/charged by a DC wall adapter or can be run on its internal...
Thanks for that.
For anyone interested, I am going to go for a push pull custom built transformer using a shielded E20 bobbin (plastic guard to separate the winding so they donÂ’t oberlap and have high insulating plastic between the primary and secondary.
I will use an LT3439 driver.
I will...
Hi Easy Peasy
Thanks for the response, as per my original email I am desgning an isolated input to theoretically survive a continuous 600V CAT III and 1000V CAT II “environment”.
I know of other products using the Broadcomm opto in a 600V CAT II rated products, but not CAT III.
I accept that...
Hi FvM, I hope it is ok to come back to your response...
You mention tables in iec61010-1:2010, but shouldn’t I be looking at table k101.2 in 61010-2-030:2010 as I am talking about signals on the measurement inputs?
The 61010-2-030 standard refers to the measurement inputs whereas the 61010-1...
If I use the following Recom DC-DC converter as an example: https://docs-emea.rs-online.com/webdocs/1373/0900766b813731f2.pdf
The /R8 unit is rated as follows:
4000VAC for 1 minute
8000VDC 1 second
For hypothetical requirements of 1000V CAT II and 600V CAT III the following test requirements...
Hi KlausT
Thanks for the reply, my issue was partly that I couldn’t find any examples that state a higher isolation voltage of around 1500V.
Regards
bode
Hi Easy Peasy
I do not quite understand your reply, do you mean that you don’t know why I can’t solve the 2kV isolation problem?
How...
Hi FvM
Your presumption is correct about reinforced insulation.
I understand the test requirements of IEC61010.
Am I correct in saying that if the design “survives” these elevated test voltages of 1 min (eg 4400VAC) then the product will survive 1kV CATII environments continuously?
Those...
Hi everyone
I am designing a product which needs an isolated measurement input which will connect to mains (as well as various CATII circuits up to 1kVrms).
I am designing to IEC61010 and need to get communication across an isolation barrier as well as power across the isolation barrier to the...
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