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Subject Author Date
How to measure resistance? Mike E. Fullerton 10-30-2006
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Posted by Mike E. Fullerton on October 30, 2006, 7:03 pm


I am trying to install a SunTouch spot warming mat. To check for
damage you need to test the resistance of the wires using a digital
ohm meter. Trouble is I have no idea what to set the meter at. If the
Reistance Range of the mat is 70-86 what setting would I use on the
meter? The meter is a Sperry DM-350A if that matters.

Thanks in advance.

_______
Free Windows Clipboard Utility
http://www.clipboardmagic.com/

Posted by Big Al on October 30, 2006, 7:17 pm



> I am trying to install a SunTouch spot warming mat. To check for
> damage you need to test the resistance of the wires using a digital
> ohm meter. Trouble is I have no idea what to set the meter at. If the
> Reistance Range of the mat is 70-86 what setting would I use on the
> meter? The meter is a Sperry DM-350A if that matters.
>
> Thanks in advance.

200 OHM scale.

Al




Posted by Mike E. Fullerton on October 30, 2006, 8:06 pm



>
>> I am trying to install a SunTouch spot warming mat. To check for
>> damage you need to test the resistance of the wires using a digital
>> ohm meter. Trouble is I have no idea what to set the meter at. If the
>> Reistance Range of the mat is 70-86 what setting would I use on the
>> meter? The meter is a Sperry DM-350A if that matters.
>>
>> Thanks in advance.
>
>200 OHM scale.

Setting it to 200 on the OHM section always says 1__. no matter which
wire combination I touch the leads with.

Here's a pic of the meter.
http://www.awsperry.com/sperry/catalog?item=dm-300

I inserted the red lead into the V terminal on the right. Not sure if
that's right or not, the manual is not very clear.

_______
Free Windows Clipboard Utility
http://www.clipboardmagic.com/

Posted by Doug Miller on October 30, 2006, 8:26 pm



>Setting it to 200 on the OHM section always says 1__. no matter which
>wire combination I touch the leads with.
>
>Here's a pic of the meter.
>http://www.awsperry.com/sperry/catalog?item=dm-300
>
>I inserted the red lead into the V terminal on the right. Not sure if
>that's right or not,

It's not.

>the manual is not very clear.

I agree that the manual could be better... but the markings on the front of
the meter are VERY clear. To measure resistance, you plug one lead into the
jack marked with the ohm symbol (Greek letter omega, the second jack from the
left), and the other lead into the jack marked COM (common).


--
Regards,
Doug Miller (alphageek at milmac dot com)

It's time to throw all their damned tea in the harbor again.

Posted by badgolferman on October 30, 2006, 9:27 pm


Doug Miller, 10/30/2006,8:26:35 PM, wrote:

>
> > Setting it to 200 on the OHM section always says 1__. no matter
> > which wire combination I touch the leads with.
> >
> > Here's a pic of the meter.
> > http://www.awsperry.com/sperry/catalog?item=dm-300
> >
> > I inserted the red lead into the V terminal on the right. Not sure
> > if that's right or not,
>
> It's not.
>
> > the manual is not very clear.
>
> I agree that the manual could be better... but the markings on the
> front of the meter are VERY clear. To measure resistance, you plug
> one lead into the jack marked with the ohm symbol (Greek letter
> omega, the second jack from the left), and the other lead into the
> jack marked COM (common).

And after you get the leads straight and make your readings ensure
there is not a diode in line. Reverse the two terminals where you are
connecting to and check your resistance again.

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