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How To Test RPM Using Multimeter?


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noeljimmy 
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Posted: June 25, 2004 at 12:07 PM / IP Logged  

can i use a multimeter to test RPM?

how i gonna use a multimeter to test RPM?

can anybody tell me?

kgerry 
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Posted: June 25, 2004 at 1:30 PM / IP Logged  
you cant
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sandt38 
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You meter must have that capability to perform that function. If it does, you will need a special amp clamp to perform the duty. The Fluke 88A will, but the Fluke 87 will not. Of course, you give up other things too. The 87 is a far quicker, far better meter, but the 88 offers more functionality.
DYohn 
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Posted: June 26, 2004 at 12:27 AM / IP Logged  
RPM?  Revolutions Per Minute?  Uh, I use a Fluke 87 every day and it does not include a tach or strope as far as I know...
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Javelin3o4 
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Posted: June 26, 2004 at 1:30 AM / IP Logged  

if you set the multimeter to AC the tach wire should read anywhere from 1-6 volts, but unless your multimeter has a rpm setting it wont show actual RPM's. Autozone sells a multimeter for 40 bucks that has rpm option.

this is the meter i use.

http://buy1.snapon.com/catalog/pro_det.asp?P65=&tool=diagnostics&item_ID=16688&group_ID=1367&store=snapon-store&dir=catalog

evnldr 
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Posted: June 26, 2004 at 5:43 AM / IP Logged  
Javelin3o4
is correct
and reving the motor will make the voltage rise as the rpm dose....
kgerry 
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Posted: June 26, 2004 at 11:11 AM / IP Logged  
which will give you an AC voltage reading not a true RPM reading...certainly there are devices to monitor this, but i've never owned a DMM that will meter true RPM........and i've owned at least a dozen good handheld meters over the years....
Kevin Gerry
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Javelin3o4 
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Posted: June 26, 2004 at 2:53 PM / IP Logged  
kgerry 
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Posted: June 26, 2004 at 3:13 PM / IP Logged  
i dont doubt it....  Snap On makes great stuff...just more than i would spend for a shop meter....
Kevin Gerry
Certified Electronics Technician
MECP First Class Installer
Owner/Installer
Classic Car Audio
since 1979
sandt38 
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Posted: June 26, 2004 at 8:08 PM / IP Logged  
Fluke 88 with a Snap-on LabelHow To Test RPM Using Multimeter? -- posted image.
Not a bad meter.
and $425 is a bit much? I don't know, I use mine enough to justify the cost. Dollars to minutes $425 ain't much at all.
Oh yeah, Snap on does not make it's own electrical test equipment ;). Most of it is OTC
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