 Multi meter how to, Ohms |
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| TheCabinetmaker |
 Mar 27 2005, 12:02 PM
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#1
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I drive my car everyday  Group: Members Posts: 8,300 Joined: 8-May 03 From: Tulsa, Ok. Member No.: 666  |
What exactly is meant by "zeroing the meter", and how do you do it? My old meter crapped out and i picked up a new one yesterday(Greenlee DM 55). I am trying to check some used CHTs and the readout only shows for a split second, and then goes back to 1. Am I doing something wrong?
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| Gint |
Mar 27 2005, 12:13 PM
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#2
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Mike Ginter Group: Admin Posts: 16,071 Joined: 26-December 02 From: Denver CO. Member No.: 20 Region Association: Rocky Mountains  |
YOu put the meter on the most sensitive resistance (ohms) scale, touch the two leads together (creating a dead short, or 0 ohms, or no [ok, damn little] resistance) and then adjust the meter dial to zero. This normally appliaes to old analog meters like Simpsons. Digitals for the most part have to be calibrated if they're off (if I'm not mistaken).
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| Gustl |
Mar 27 2005, 12:18 PM
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#3
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914 enthusiast & historian Group: Members Posts: 11,502 Joined: 16-June 04 From: TIROL / Austria Member No.: 2,212 Region Association: Austria  |
due to my bad english knowledge I'm not sure if I got your question right
if you'd like to measure the resistance (ohm), "zeroing the meter" means to shortcut the measuring strips - then it should display "0" I've no idea what's a CHT, but if your DM flashes back to "1" just after any result I guess you've a contact problem all DMs that I know display "1" for infinity |
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| Joe Bob |
Mar 27 2005, 12:20 PM
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#4
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Retired admin, banned a few times Group: Members Posts: 17,427 Joined: 24-December 02 From: Boulder CO Member No.: 5 Region Association: None |
CHT= Cylinder Head Temp?
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| Gint |
Mar 27 2005, 12:25 PM
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#5
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Mike Ginter Group: Admin Posts: 16,071 Joined: 26-December 02 From: Denver CO. Member No.: 20 Region Association: Rocky Mountains |
I assume you mean "cylinder head temp sensors". It almost sounds like your not reading straight resistance.
We need more detail to go much further me thinks... I'm off to Ma-in-laws (IMG:http://www.914world.com/bbs2/html/emoticons/wacko.gif) |
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| MarkV |
Mar 27 2005, 12:36 PM
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#6
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Fear the Jack Stands Group: Members Posts: 1,493 Joined: 15-January 03 From: Sunny Tucson, AZ Member No.: 154 Region Association: None |
I think you are measuring straight continuity. My Fluke auto ranges in the ohms setting. If yours doesn't auto range just set it the most sensitive range.
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| TheCabinetmaker |
Mar 27 2005, 01:07 PM
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#7
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I drive my car everyday Group: Members Posts: 8,300 Joined: 8-May 03 From: Tulsa, Ok. Member No.: 666 |
Figured it out. Thanks all for the help.
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| bperry |
Mar 27 2005, 01:19 PM
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#8
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Lurker Group: Members Posts: 477 Joined: 16-February 04 From: Dallas, Tx Member No.: 1,661 |
Well, here is a picture of an anolog meter that I bought back in the Mid 70's.
Still works to this day! To "zero" the meter, there are actually up to 3 places to adjust. "A" adjusts the physical meter mechanics to ensure that needle is ligning up properly on the left side of the scale when the meter is off. (Seldom messed with) The "B" knob called "Zero Adjust" is used to adjust the meter at its left most point (where "Zero" volts would be) when the meter is turned on. The "C" knob called "Ohms Adjust" is used to adjust the meter at its full scale when the probe wires are shorted and the power is on. This is used to set the full deflection to where "Zero" ohms would be. For this meter, you always adjust B. If you are taking resistance measuremens (ohms) you adjust C. These adjustments are mainly for older analog meters whose readings can vary depending on battery condition and current temperature. Hope that helps. --- bill Attached image(s) 
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| TheCabinetmaker |
Mar 27 2005, 02:48 PM
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#9
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I drive my car everyday Group: Members Posts: 8,300 Joined: 8-May 03 From: Tulsa, Ok. Member No.: 666 |
Thanks Bill, but i have a digital. Found out its a moot point with a digital. Called an electrician friend and he laughed at me. Oh well, If I knew everything I would run the world, right? (IMG:http://www.914world.com/bbs2/html/emoticons/laugh.gif)
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| redshift |
Mar 27 2005, 02:57 PM
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#10
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Bless the Hell out of you! Group: Members Posts: 10,926 Joined: 29-June 03 Member No.: 869 |
No, not really.
M |
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| TheCabinetmaker |
Mar 27 2005, 03:01 PM
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#11
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I drive my car everyday Group: Members Posts: 8,300 Joined: 8-May 03 From: Tulsa, Ok. Member No.: 666 |
Your right miles. I would be too smart to want that job! (IMG:http://www.914world.com/bbs2/html/emoticons/wink.gif)
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