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Is my brand new Multimeter broken? Modular Synthesizers
Old 25th December 2010
  #1
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datune's Avatar
Is my brand new Multimeter broken?

So I tried to do the very first experiment in the book I got, which was to test the resistance of my own tongue, and I did everything as instructed, but my $120 brand new multimeter doesn't show any result.

Quote:
We’re going to use the meter to discover the electrical resistance of your
tongue. First, set your meter to measure resistance. If it has autoranging, look
to see whether it is displaying a K, meaning kilohms, or M, meaning megohms.
If you have to set the range manually, begin with no less than 100,000 ohms
(100K). See Figures 1-23 through 1-25.
Touch the probes to your tongue, about an inch apart. Note the reading,
which should be around 50K.
Am I doing something wrong?

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Old 25th December 2010
  #2
Do you have the black probe plugged in?

Rail
Old 25th December 2010
  #3
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brianroth's Avatar
 

Also, what happens when you merely touch the two probe ends together? That should read nearly 0 Ohms.

That is ALWAYS Step One when measuring resistance...be sure the probes and meter are capable of "seeing" the "dead short" when the probes are touched together.

Best,

Bri
Old 25th December 2010
  #4
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StratSvante's Avatar
 

And have you tried moving the thing to 2 m instead of 200 k?
Old 25th December 2010
  #5
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datune's Avatar
First, thanks for all replies.

Quote:
Originally Posted by PlatinumSamples View Post
Do you have the black probe plugged in?

Rail
Yes.

Quote:
Originally Posted by brianroth
Also, what happens when you merely touch the two probe ends together? That should read nearly 0 Ohms.

That is ALWAYS Step One when measuring resistance...be sure the probes and meter are capable of "seeing" the "dead short" when the probes are touched together.

Best,

Bri
it reads (depending on the setting) 0.00 when the two probes are touching.

Quote:
Originally Posted by StratSvante
And have you tried moving the thing to 2 m instead of 200 k?
I just tried that, and it gives continues varying results, ranging from 0.835 to 1.450.

I did a different test, I took a 470Ohm resistor, and successfully measured it. So I assume the meter is working, I just wonder why I can't measure the resistance of my tongue. Can you guys measure it successfully, with the results as predicted by the author of the book (see my OP)
Old 25th December 2010
  #6
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Rick Sutton's Avatar
 

Always remember to take the coat off your tongue when measuring it's resistance. This step eluded me for years.
Another tip. Always remember to use separate probes for oral and anal resistance measurements.


Seriously, use your new multimeter for what it is intended for and I'm sure that it will work just fine.
You might want to get a different book.
Old 25th December 2010
  #7
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Minion's Avatar
 

moove the meter setting to a higher one ... the resistance of my body is between 1.5m and 2.5m depending on the day ....
Old 25th December 2010
  #8
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datune's Avatar
Quote:
Originally Posted by Minion View Post
moove the meter setting to a higher one ... the resistance of my body is between 1.5m and 2.5m depending on the day ....
Thanks, most likely this is what the author intended for me to figure out on my own. To summarize, the DMM seems to be working fine.

Amazon.com: MAKE: Electronics: Learning Through Discovery (9780596153748): Charles Platt: Books
Old 25th December 2010
  #9
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cyrano's Avatar
 

Skin resistance measurement is what is being used for lie detectors...
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