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electronics_field
Joined: 06 Oct 2006 Posts: 6
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Posted: Fri Oct 06, 2006 10:36 pm Post subject: cnr 10d471k VARISTOR how to know is short or not by |
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cnr 10d471k VARISTOR how to know is short or not by
analog meter |
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underquark Expert
Joined: 20 Jun 2005 Posts: 874 Location: UK |
Posted: Sun Oct 08, 2006 4:02 am Post subject: |
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Welcome back "newone"? |
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zaphod7501
Joined: 02 Aug 2004 Posts: 534 Location: Peoria Illinois |
Posted: Sun Oct 08, 2006 9:54 am Post subject: |
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The Ohmmeter section of an analog meter will tell you the value of a resistor which you then compare with it's markings or the schematic. You usually have to remove it from the circuit first.
You can't check a varistor until you know if it is PTC or NTC. You need to look up it's markings and find out what it is. One type will read "low" and one will read "high". No exact measurement is possible because it varies with voltage and/or current. (and they almost never fail unless they literally burn up). _________________ Just call me Zaphod (or Steve) --- I never should have started using numbers in a screen name but I just can't stop now. |
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electronics_field
Joined: 06 Oct 2006 Posts: 6
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Posted: Tue Oct 10, 2006 3:17 pm Post subject: how to know IR LED of remote is damage |
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how to know IR LED of remote is damage
i have remote i want to check ir led by om meter analog
please reply |
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Mark Pierson Expert
Joined: 03 Aug 2003 Posts: 3017 Location: Connecticut, USA |
Posted: Tue Oct 10, 2006 3:52 pm Post subject: |
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If you have a digital camera or camcorder with an LCD viewfinder you can use that to see if the IR led works. It will show bright white in the viewfinder. _________________ Mark |
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The Robman Site Owner
Joined: 01 Aug 2003 Posts: 21248 Location: Chicago, IL |
Posted: Tue Oct 10, 2006 4:29 pm Post subject: |
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I wouldn't bother answering any of this guys questions until he shows some evidence that he's actually reading the replies, which he hasn't done yet. _________________ Rob
www.hifi-remote.com
Please don't PM me with remote questions, post them in the forums so all the experts can help! |
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electronics_field
Joined: 06 Oct 2006 Posts: 6
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Posted: Tue Oct 10, 2006 8:36 pm Post subject: how to know IR LED of remote is damage |
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how to know IR LED of remote is damage
i have remote i want to check ir led by om meter analog
please reply |
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electronics_field
Joined: 06 Oct 2006 Posts: 6
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Posted: Wed Oct 11, 2006 11:05 am Post subject: |
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any help |
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The Robman Site Owner
Joined: 01 Aug 2003 Posts: 21248 Location: Chicago, IL |
Posted: Wed Oct 11, 2006 2:28 pm Post subject: |
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electronics_field wrote: | any help |
You've been given lots of help before when you used the "newone" user id, but never one did you post any follow up. _________________ Rob
www.hifi-remote.com
Please don't PM me with remote questions, post them in the forums so all the experts can help! |
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electronics_field
Joined: 06 Oct 2006 Posts: 6
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Posted: Thu Oct 19, 2006 10:54 pm Post subject: IS THERE WAY TO CHECK INFRA RED LED IN REMOTE TV IS GOOD OR |
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IS THERE WAY TO CHECK INFRA RED LED IN REMOTE TV IS GOOD OR BROKEN BY ANALOG METER
AND THE INFRA RED LED TESTED TAKE OF FROM REMOTE OR INSIDE
IS THERE PROCEDURE TO CHECK INFRA LED BY ANALOG METER NOT WHOLE REMOTE |
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johnsfine Site Admin
Joined: 10 Aug 2003 Posts: 4766 Location: Bedford, MA |
Posted: Fri Oct 20, 2006 6:42 am Post subject: |
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The electronic viewfinder of most digital cameras and camcoders will show IR light as white.
That's how most of us test whether an IR LED is working (in an otherwise working remote).
If someone here knew how to check it with a meter they probably would have said so already. I don't think there is a practical way.
I also can't tell whether you mean testing an LED that has been completely disconnected from the remote or while it is still connected.
For completely disconnected, you should look at the spec sheet for a typical IR LED. They all have similar electrical characteristics. You should be able to think of some tests to see if your disconnected LED is close to the correct electrical characteristics. If it is seriously off (such as open circuit) you could conclude it is broken. But I don't know how much it might take to conclude it isn't broken (by that method which is so much harder than using a viewfinder). |
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