Fluke readings

[boatmanwayne]

Need assurance of specs on meter.<br />I am testing the trigger on an inline merc 6 cylinder, manual says 11-14 ohms with VOA set a Rx100, question is, being my meter is digital, is my meter self adjusting? It is showing a reading of 920, do I read this as 9.20 (a little over 9 OHMS)? Any lessons will be appreciated. Thanks BMW

 

[dogsdad]

Re: Fluke readings

Hi BMW...yeas, your meter is auto-ranging if there is not a range selector switch on it. Many digital multimeters these days are auto-ranging.<br /><br />"11-14 ohms with VOA set a Rx100" actually means 100 to 1400 Ohms. If you're getting 920 on an auto-ranging meter, then it means 920 Ohms. <br /><br />I'm not sure that 920 Ohms is an okay reading on your trigger, but someone should be along any minute now who can tell ya fer sure. With that caveat, I'll venture to guess that it's fine...I've seen a few instances here in the forums where you won't get the same resistance readings that the manuals specify.<br /><br />Best wishes.<br /><br />-dd-<br /><br />Edited: made a typo when I said "100 to 1400"...should have been 1100-1400.

 

[rickdb1boat]

Re: Fluke readings

What motor is it? Sounds about right on the readings, though.

 

[boatmanwayne]

Re: Fluke readings

Rick, The engine is a 1988 6cyl merc, w/cdi dual switchboxes, I'm getting fire on #1&#6 only. Engine hasn't run since I got it. Seems to me if 11-14=1100-1400ohms, then 920 would be to low. The stator checks out fine, all wiring is in good shape with clean and tight grounds. Any more thoughts are appreciated, Thanks BMW.

 

[Hooty]

Re: Fluke readings

Does your manual give specs for peak voltages? If it does, there's a peak voltage reading adaptor for your Fluke. It's worth getting. <br /><br />c/6<br />Hooty

 

[boatmanwayne]

Re: Fluke readings

Update, in my last post it is supposed to read fire on number 1 and number 6 only, but it shows #1 & a box?, I went back to edit it and it shows it correctly in my original post.

 

[rickdb1boat]

Re: Fluke readings

You should read from 750-1400 Ohms on the trigger

 

[sprinkler]

Re: Fluke readings

If it's an auto-adjust Fluke, "920" is 920 ohms. If the meter adjusts the decimal point for you, you'll see the "kohm" or "Mohm" pop up on the right hand side.

 

[dogsdad]

Re: Fluke readings

I just read the response I posted several days ago. Don't know why I didn't spot it, but I should have said, and meant to say, that the reading means 1100-1400 Ohms. Sorry if I caused confusion, mayhem, panic, or any cognitive dissonance!<br /><br /> <br /><br />-dd-

 

[schaiss]

Re: Fluke readings

The reading you state (920 ohms) is a good one for your trigger. The spec states 1100 to 1400 ohms, these numbers are given with a certain amount of tolerance (percentage of error).<br />Your trigger is OK.

 

[boatmanwayne]

Re: Fluke readings

Thanks guys, I swapped the trigger with an old one off a V-6 just to try and it did the same thing even though it OHM'd out at 1300 ohms. probably switchboxes are bad, I've got two on order, if that isn't it I will have two nice testers, I needed them anyway. Thanks again BMW

 

[mfarish]

Re: Fluke readings

the actual meter reading you get will vary on<br />the ambient temperature. Also, your meter leads can throw you off if they are in rough shape (the wire) or old wire.

 

[KCLOST]

Re: Fluke readings

BMW, to test the switchboxes all you need to do is switch the stator leads that go to each switchbox from one to the other. One box has red and blue wires the other has a red/white and a blue/white...They are connected at the top... Switch them from one box to the other and retest for spark. If the firing stays the same, you have bad switchboxes...