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Resistor check
12/29/2007 11:50:44 PMDavid
Can a resistor be checked in circuit and if so how? I have a VOM, I although do not know how to use one, it is digital. If you can help I would appreciate it. Thanks.

Dave

12/30/2007 10:03:24 AMLewis
:Can a resistor be checked in circuit and if so how? I have a VOM, I although do not know how to use one, it is digital. If you can help I would appreciate it. Thanks.
:
:Dave
:

Dave:
That would depend on where in the circuit the resistor is, and the value of the resistor. To use a digital meter, A) Turn it on, B) Select the Ohms function, C) If necessary, select the scale, D) Read the display.
If there is other resistance across the one you are measuring, then you will get a lower reading than the resistor actually is. The best answer I can give you is a positive "maybe".
Lewis

12/30/2007 10:38:27 AMDave
Thank you Lewis, it helped, the real point was is it tested in series or parallel?

Dave

::Can a resistor be checked in circuit and if so how? I have a VOM, I although do not know how to use one, it is digital. If you can help I would appreciate it. Thanks.
::
::Dave
::
:
:Dave:
:That would depend on where in the circuit the resistor is, and the value of the resistor. To use a digital meter, A) Turn it on, B) Select the Ohms function, C) If necessary, select the scale, D) Read the display.
:If there is other resistance across the one you are measuring, then you will get a lower reading than the resistor actually is. The best answer I can give you is a positive "maybe".
:Lewis

12/30/2007 11:46:03 AMTonyJ
Place the meter probes in parallel with the resistor (i.e. one on either end). Polarity doesn't matter. As Lewis pointed out, depending on the circuit, the resistance may be lower if other components are in parallel with the unit.


:Thank you Lewis, it helped, the real point was is it tested in series or parallel?
:
:Dave
:
:::Can a resistor be checked in circuit and if so how? I have a VOM, I although do not know how to use one, it is digital. If you can help I would appreciate it. Thanks.
:::
:::Dave
:::
::
::Dave:
::That would depend on where in the circuit the resistor is, and the value of the resistor. To use a digital meter, A) Turn it on, B) Select the Ohms function, C) If necessary, select the scale, D) Read the display.
::If there is other resistance across the one you are measuring, then you will get a lower reading than the resistor actually is. The best answer I can give you is a positive "maybe".
::Lewis

12/30/2007 12:11:54 PMDave
Tony:

THanmks, I tested it and it's supposed to be 1 and it reads 1.08, which seems to indicate it's ok? What is your take Tony? Thanks


:Place the meter probes in parallel with the resistor (i.e. one on either end). Polarity doesn't matter. As Lewis pointed out, depending on the circuit, the resistance may be lower if other components are in parallel with the unit.
:
:
::Thank you Lewis, it helped, the real point was is it tested in series or parallel?
::
::Dave
::
::::Can a resistor be checked in circuit and if so how? I have a VOM, I although do not know how to use one, it is digital. If you can help I would appreciate it. Thanks.
::::
::::Dave
::::
:::
:::Dave:
:::That would depend on where in the circuit the resistor is, and the value of the resistor. To use a digital meter, A) Turn it on, B) Select the Ohms function, C) If necessary, select the scale, D) Read the display.
:::If there is other resistance across the one you are measuring, then you will get a lower reading than the resistor actually is. The best answer I can give you is a positive "maybe".
:::Lewis

12/30/2007 12:49:17 PMTonyJ
Generally from what I've read, as long as the resistor is within 20% of the rated value you should be good to go.

:Tony:
:
:THanmks, I tested it and it's supposed to be 1 and it reads 1.08, which seems to indicate it's ok? What is your take Tony? Thanks
:
:
:
:
::Place the meter probes in parallel with the resistor (i.e. one on either end). Polarity doesn't matter. As Lewis pointed out, depending on the circuit, the resistance may be lower if other components are in parallel with the unit.
::
::
:::Thank you Lewis, it helped, the real point was is it tested in series or parallel?
:::
:::Dave
:::
:::::Can a resistor be checked in circuit and if so how? I have a VOM, I although do not know how to use one, it is digital. If you can help I would appreciate it. Thanks.
:::::
:::::Dave
:::::
::::
::::Dave:
::::That would depend on where in the circuit the resistor is, and the value of the resistor. To use a digital meter, A) Turn it on, B) Select the Ohms function, C) If necessary, select the scale, D) Read the display.
::::If there is other resistance across the one you are measuring, then you will get a lower reading than the resistor actually is. The best answer I can give you is a positive "maybe".
::::Lewis

12/30/2007 12:52:17 PMLewis
:Generally from what I've read, as long as the resistor is within 20% of the rated value you should be good to go.
:
::Tony:
::
::THanmks, I tested it and it's supposed to be 1 and it reads 1.08, which seems to indicate it's ok? What is your take Tony? Thanks

It can read lower because of something in parallel with it (like a transformer winding, which will be very low), but if it is higher, then the resistor is definately bad. For example, if your resistor read 5, there is no way it is correct.
Lewis
::
::
::
::
:::Place the meter probes in parallel with the resistor (i.e. one on either end). Polarity doesn't matter. As Lewis pointed out, depending on the circuit, the resistance may be lower if other components are in parallel with the unit.
:::
:::
::::Thank you Lewis, it helped, the real point was is it tested in series or parallel?
::::
::::Dave
::::
::::::Can a resistor be checked in circuit and if so how? I have a VOM, I although do not know how to use one, it is digital. If you can help I would appreciate it. Thanks.
::::::
::::::Dave
::::::
:::::
:::::Dave:
:::::That would depend on where in the circuit the resistor is, and the value of the resistor. To use a digital meter, A) Turn it on, B) Select the Ohms function, C) If necessary, select the scale, D) Read the display.
:::::If there is other resistance across the one you are measuring, then you will get a lower reading than the resistor actually is. The best answer I can give you is a positive "maybe".
:::::Lewis



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