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Old 08-03-2008, 09:15 PM #1
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Default DMM Malfunction?

I just got my new DMM (after my older one broke), and when i try to test the continuity of secrets using the resistance feature, it always reads "1". The reading doesn't change at all, except when i short the leads together. I even tested it on a working lightbulb, no luck... still reads "1"

When the circuit is continous, it is supposed to read "0", and i even tried it on all the resistance settings. Anyone know what is wrong?


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Old 08-03-2008, 09:43 PM #2
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Default Re: DMM Malfunction?

Check the fuse first -- Always use the KISS method ;D

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Old 08-03-2008, 09:49 PM #3
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Default Re: DMM Malfunction?

If your meter only registers a reading when you short the leads but not on other resistances on any resistance range then I'd return it as the fuse is obviously working if it registers when you short the leads
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Old 08-04-2008, 05:28 AM #4
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Default Re: DMM Malfunction?

Quote:
Originally Posted by MarioMaster
If your meter only registers a reading when you short the leads but not on other resistances on any resistance range then I'd return it as the fuse is obviously working if it registers when you short the leads
Well, it isn't a problem with all the other settings... so the fuse seems to be working fine...
Like when i set the current, it works without any problems :-/
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Old 08-13-2008, 07:09 AM #5
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Default Re: DMM Malfunction?

Sounds like a bad multimeter.. return it and get another one.

I recommend a good Fluke.. they last and very durable.
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Old 08-13-2008, 07:17 AM #6
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Default Re: DMM Malfunction?

Quote:
Originally Posted by Spyderz20x6
[quote author=MarioMaster link=1217798107/0#2 date=1217800196]If your meter only registers a reading when you short the leads but not on other resistances on any resistance range then I'd return it as the fuse is obviously working if it registers when you short the leads
Well, *it isn't a problem with all the other settings... so the fuse seems to be working fine...
Like when i set the current, it works without any problems :-/[/quote]

If it is a digital meter, there are most likely different functions or settings with in that test mode...
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Old 08-13-2008, 11:05 AM #7
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Default Re: DMM Malfunction?

On one of my meters 1, to the left of the screen, means open circuit.... If only a dead short changes the reading then there must be a fault as suggested by others above..... I assume that you have tried a known value resistor to see if it registers?

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Old 08-13-2008, 03:50 PM #8
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Default Re: DMM Malfunction?

Quote:
Originally Posted by rog8811
On one of my meters 1, to the left of the screen, means open circuit.... If only a dead short changes the reading then there must be a fault as suggested by others above..... I assume that you have tried a known value resistor to see if it registers?

Regards rog8811
Yes, i have. And it reads the value of the resistor just fine. So i guess "1" means open circuit?
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Old 08-13-2008, 04:24 PM #9
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Default Re: DMM Malfunction?

Quote:
So i guess "1" means open circuit?
That would be my guess

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Old 08-13-2008, 04:55 PM #10
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Default Re: DMM Malfunction?

Did you put the meter on the highest resistance scale?
If you are on the Lowest scale (ie 200 Ohms) and are measuring
say, 10,000 Ohms the meter will read "1" showing an over range
resistance.
If you touch just the leads together you should get close to "0".

OR

The Fuse is blown

OR

The meter is defective


Just a thought.
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Old 08-13-2008, 09:33 PM #11
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Default Re: DMM Malfunction?

Quote:
Originally Posted by laserguys
Did you put the meter on the highest resistance scale?
If you are on the Lowest scale (ie 200 Ohms) and are measuring
say, 10,000 Ohms the meter will read "1" showing an over range
resistance.
If you touch just the leads together you should get close to "0".

OR

The Fuse is blown

OR

The meter is defective


Just a thought. *
The fuse and meter are fine! It reads resistance value. But i can't seem to figure out how to measure continuaty...
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Old 08-14-2008, 01:33 AM #12
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Default Re: DMM Malfunction?

When you touch the 2 probes of your together you are testing continuity from the Black plug on your meter to the Red plug on your meter and it should read close to zero plus the small resistance of your meter leads.

If you take a piece of say 18 guage wire about 10 feet long and check the resistance (or continuity), you should read a very low resistance value on your meter.
If the wire is then cut, you will see a high resistance value or a "1" to the left of
your meter lcd showing the resistance is (very high) over range.
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Old 08-14-2008, 02:29 PM #13
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Default Re: DMM Malfunction?

For continuity set it to the diode test setting, see the picture I posted here...
http://www.laserpointerforums.com/fo...18290999/10#10
With 2 of my meters the diode symbol has a loudspeaker symbol as well and meters buzz when you touch the wires together.

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Old 08-14-2008, 04:06 PM #14
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Default Re: DMM Malfunction?

Quote:
Originally Posted by rog8811
For continuity set it to the diode test setting, see the picture I posted here...
http://www.laserpointerforums.com/fo...18290999/10#10
With 2 of my meters the diode symbol has a loudspeaker symbol as well and meters buzz when you touch the wires together.

Regards rog8811
Oh!! Alright, thanks!
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