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How do you do....it? Thread, PAT Testing a TFT Monitor, external adapter in Technical; Am I right in thinking that a visual inspection is sufficient for a TFT monitor with an external power adapter?...
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    enjay's Avatar
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    PAT Testing a TFT Monitor, external adapter

    Am I right in thinking that a visual inspection is sufficient for a TFT monitor with an external power adapter?

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    p858snake's Avatar
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    Based on http://www.edugeek.net/forums/behind...tml#post468942 you will need to do the removable cord part (socket to female IEC) which plugs into the transformer box.

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    Quote Originally Posted by p858snake View Post
    Based on http://www.edugeek.net/forums/behind...tml#post468942 you will need to do the removable cord part (socket to female IEC) which plugs into the transformer box.
    It depends. If the cord's plug is a sealed unit, a visual inspection would be fine.

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    powdarrmonkey's Avatar
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    No you are not correct (and on this basis, you shouldn't be testing things. This is a really basic question...)

    If the flying lead is not permanently attached to the transformer, it needs a separate IEC test. The transformer itself probably needs a class II test, but only if it's double insulated. If it's not, it gets a class I.


    edit: and yes, you need to attach the monitor.
    Last edited by powdarrmonkey; 2nd March 2010 at 09:44 AM.

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    powdarrmonkey's Avatar
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    Quote Originally Posted by fafster View Post
    It depends. If the cord's plug is a sealed unit, a visual inspection would be fine.
    NO. NO, No, no.

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    The power supply will need testing but there is not test for the monitor itself as it is running on a low voltage.

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    powdarrmonkey's Avatar
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    Quote Originally Posted by mgarland View Post
    The power supply will need testing but there is not test for the monitor itself as it is running on a low voltage.
    Wrong, you need the monitor connected to provide real-world load conditions, eliminate short behaviour, etc.

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    enjay's Avatar
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    So, I plug it into a (known good) cable, and turn it on - right?

    I am registered to test stuff here, but have never actually done it! I went on the course several years ago, and when it transpired how little IT equipment actually needs testing, I largely walked away from it.

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    powdarrmonkey's Avatar
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    Quote Originally Posted by enjay View Post
    So, I plug it into a (known good) cable, and turn it on - right?
    What's this "it"?

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    The adapter and monitor.

    We've been given it second-hand, so I want to have it tested (we were advised not to bother with brand new equipment).

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    Sorry Powdarrmonkey, I believe you are incorrect. As it's a transformer, and the voltages within the appliance are below 50 volts, it's a Class 3 appliance. It doesn't need testing. Therefore, you perform a formal visual inspection. Check to see there is no damage to the transformer, cable or device, and that it has the correctly rated fuse.

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    Hypothetically, since I don't think you should actually be doing it, you:

    1. Plug both ends of the IEC into your tester and perform an IEC test;
    2. Plug the tail end of the IEC into the adaptor, connect and switch on the monitor, and perform the appropriate test, which depends on the adaptor;
    3. GET BACK ON THE COURSE BEFORE YOU KILL SOMEONE.

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    Quote Originally Posted by fafster View Post
    Sorry Powdarrmonkey, I believe you are incorrect. As it's a transformer, and the voltages within the appliance are below 50 volts, it's a Class 3 appliance. It doesn't need testing. Therefore, you perform a formal visual inspection. Check to see there is no damage to the transformer, cable or device, and that it has the correctly rated fuse.
    Nope, not unless it carries the class III mark and the transformer is certified to BS3535, in which case it also has a specialist mark. I have never seen a sealed consumer power supply that isn't class II or, more unusually, class I. If it's marked double-insulated, it's class II; if it's not marked at all it's class I.

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    Quote Originally Posted by fafster View Post
    Sorry Powdarrmonkey, I believe you are incorrect. As it's a transformer, and the voltages within the appliance are below 50 volts, it's a Class 3 appliance. It doesn't need testing. Therefore, you perform a formal visual inspection. Check to see there is no damage to the transformer, cable or device, and that it has the correctly rated fuse.
    That was my understanding and is confirmed by http://www.hse.gov.uk/pubns/indg236.pdf.

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    Quote Originally Posted by enjay View Post
    That was my understanding and is confirmed by http://www.hse.gov.uk/pubns/indg236.pdf.
    That document doesn't even contain the words "Class 3".

    I think I understand what you're getting at. The monitor itself is an SELV device, but you're not testing the monitor. You're testing the adaptor, which plugs into the mains and is class I or II, unless you've paid $$$ for it. FFS, look at the brick and tell me if you see the class II or III mark on it.

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