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Re: IEC 62353 [Re: umish] #69288
27/04/15 06:59 PM
27/04/15 06:59 PM
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MikeX Offline
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I get the impression that many who are performing medical electrical safety tests like to speed a long time doing these tests! If you use typical 60601 tests on a PC based ultrasound with ECG and say 5 probes with a typical boot up/down of 10 to 15 mins then you could easily spend a few hours performing the tests.

Using 62353 Alternative methods, assuming you had ensured the power switch is in the on position, it would take about 5 mins to do the tests and then just the time it takes to boot up and perform a function test (as required by 62353) and your done.

Many manufactures are now updating their service material to 62353 and often choose the Alternative method for speed and safety. I know Siemens have recently updated their Ultrasound product electrical safety service instructions to 62353 and have adopted the Alternative method.

Re: IEC 62353 [Re: MikeX] #69289
27/04/15 08:30 PM
27/04/15 08:30 PM
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Geoff Hannis Online content
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My own suspicions are that the folk we have been hearing from don't get around to carrying out EST on ultrasound systems very often! whistle

As an aside, I wonder why 62353 explictly includes the requirement that a functional test be carried out? Myself, I have always considered EST to be part of PM (and not the other way around). smile

Re: IEC 62353 [Re: umish] #69300
29/04/15 12:55 PM
29/04/15 12:55 PM
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RoJo Offline
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Quote:
What if you switch on ... but still haven't plugged into the mains?

An electrical safety test with no electricity involved what a perfect way to make sure everything passes and is "safe". think

As to the matter of time....a good ES tester should be able to power the device on, then when it has booted you then start the tests in normal polarity. you then power it down, reverse polarity, boot the device and do the tests again. I was using a tester that did this well over 10years ago..... and what device takes 10minutes to boot? No modern stuff surely.
But yes there is plenty of old stuff around still.
But surely EST is about making sure the device is safe rather than cutting corners to tick the "I have done it" box in as short a time as possible.
Robert


My spelling is not bad. I am typing this on a Medigenic keyboard and I blame that for all my typos.
Re: IEC 62353 [Re: RoJo] #69302
29/04/15 02:38 PM
29/04/15 02:38 PM
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Geoff Hannis Online content
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Can we take it that you're not a great fan of 62353 then, Robert? whistle

Re: IEC 62353 [Re: RoJo] #69305
29/04/15 04:57 PM
29/04/15 04:57 PM
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MikeX Offline
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Originally Posted By: RoJo
An electrical safety test with no electricity involved what a perfect way to make sure everything passes and is "safe". think

Well, if you read IEC 62353 you would know the Alternative method tests apply an AC voltage equal to the mains voltage to perform the test. So we do indeed have electricity involved!

Think of it as a souped up insulation test, except you never get the same reading (infinity) with the DUT either plugged into the test meter or not! You get a accurate representation of the true device leakage, which is directly related to the 60601-1 open neutral value.

Also not many test meters I know can switch from performing equipment leakage tests to applied parts leakage tests without interrupting the mains supply to the EUT.

Re: IEC 62353 [Re: MikeX] #73119
12/04/18 10:32 AM
12/04/18 10:32 AM
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Geoff Hannis Online content
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Three years on ... does anyone have an up to date list of which testers are now available to carry out tests to 62353?

I'm thinking of portable types able to follow the Alternative Method.

Are any completely battery powered? smile

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