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Subject Author Date
How to measure resistance? Mike E. Fullerton 10-30-2006
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Posted by Jim Yanik on October 30, 2006, 11:00 pm


spambait@milmac.com (Doug Miller) wrote in

>>
>>>
>>> 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.
>>
>>That's correct.
>
> I doubt it very much -- what do you suppose the jack labelled with the
> ohm symbol is for?
>
>

he didn't look at the pix... the enlarged .jpg.

some DMMs use the V jack for ohms,this model is not one of those.
--
Jim Yanik
jyanik
at
kua.net

Posted by Robert Barr on October 30, 2006, 8:47 pm


Oops, my mistake. I was looking at the wrong meter.

Use the two center terminals.



Mike E. Fullerton wrote:

>
>
>>
>>>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 Jim Yanik on October 30, 2006, 10:59 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/
>


Yu need to have the red lead in the "ohms" jack,the one with the Omega
symbol,between "A" jack and COM jack. Then use the 200 ohm range.
--
Jim Yanik
jyanik
at
kua.net

Posted by mm on October 31, 2006, 1:01 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/
>>
>
>
>Yu need to have the red lead in the "ohms" jack,the one with the Omega
>symbol,between "A" jack and COM jack. Then use the 200 ohm range.

uNLESS I"m looking at the wrong picture, the A jack is for the 10 amp
scale only. Everything else in this meter uses the middle jack for
the black wire**, and the right jack for the red.

**This meter probably has autopolarity, that is, if you connect the
wires backwards it gives the same reading***, but preceded by a
negative sign.

***Unless there is a diode or other semiconductor between the two
probes.



Posted by Jim Yanik on October 31, 2006, 7:19 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/
>>>
>>
>>
>>Yu need to have the red lead in the "ohms" jack,the one with the Omega
>>symbol,between "A" jack and COM jack. Then use the 200 ohm range.
>
> uNLESS I"m looking at the wrong picture, the A jack is for the 10 amp
> scale only. Everything else in this meter uses the middle jack for
> the black wire**, and the right jack for the red.

you must be looking at the wrong pic,the DM-350A I looked at had 4 jacks;
A for amps
"omega" for ohms
COM
V for volts.

The TOP pix was a different model (DM-370)than what the OP cited.(DM-350A)


--
Jim Yanik
jyanik
at
kua.net

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