How To Test RPM Using Multimeter?

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noeljimmy

Member - Posts: 8

Joined: December 05, 2003

Location: Malaysia

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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Joined: February 07, 2004

Location: Saskatchewan, Canada

Posted: June 25, 2004 at 1:30 PM / IP Logged

you cant

Kevin Gerry

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since 1979

sandt38

Copper - Posts: 60

Joined: May 25, 2004

Location: United States

Posted: June 25, 2004 at 3:09 PM / IP Logged

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.

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Joined: April 22, 2003

Location: Arizona, United States

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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Joined: August 22, 2003

Location: United States

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

Member - Posts: 36

Joined: December 28, 2002

Location: United States

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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Joined: February 07, 2004

Location: Saskatchewan, Canada

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

Certified Electronics Technician

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Owner/Installer

Classic Car Audio

since 1979

Javelin3o4

Copper - Posts: 239

Joined: August 22, 2003

Location: United States

Posted: June 26, 2004 at 2:53 PM / IP Logged

my dmm reads true rpm its an autmotive dmm

here is mine

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

kgerry

Platinum - Posts: 3,455

Joined: February 07, 2004

Location: Saskatchewan, Canada

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

Copper - Posts: 60

Joined: May 25, 2004

Location: United States

Posted: June 26, 2004 at 8:08 PM / IP Logged

Fluke 88 with a Snap-on Label How 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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