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cnr 10d471k VARISTOR how to know is short or not by
Posted: Fri Oct 06, 2006 9:36 pm
by electronics_field
cnr 10d471k VARISTOR how to know is short or not by
analog meter
Posted: Sun Oct 08, 2006 3:02 am
by underquark
Welcome back "newone"?
Posted: Sun Oct 08, 2006 8:54 am
by zaphod7501
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).
how to know IR LED of remote is damage
Posted: Tue Oct 10, 2006 2:17 pm
by electronics_field
how to know IR LED of remote is damage
i have remote i want to check ir led by om meter analog
please reply
Posted: Tue Oct 10, 2006 2:52 pm
by Mark Pierson
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.
Posted: Tue Oct 10, 2006 3:29 pm
by The Robman
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.
how to know IR LED of remote is damage
Posted: Tue Oct 10, 2006 7:36 pm
by electronics_field
how to know IR LED of remote is damage
i have remote i want to check ir led by om meter analog
please reply
Posted: Wed Oct 11, 2006 10:05 am
by electronics_field
any help
Posted: Wed Oct 11, 2006 1:28 pm
by The Robman
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.
IS THERE WAY TO CHECK INFRA RED LED IN REMOTE TV IS GOOD OR
Posted: Thu Oct 19, 2006 9:54 pm
by electronics_field
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
Posted: Fri Oct 20, 2006 5:42 am
by johnsfine
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).