Can i use a Fluke meter with Min/Max fuction to test DVA readings

[Leeman Seaman]

I have a 2004 Johnson 90Hp V4 that is having problems, missing and shaking hard when under throttle. I have disconnected the tan temp switch leads to no avail. I have researched the testing of this motor and think that I know what to test. The motor runs great when cold, but after 15 min running it starts to miss. I believe from what I have read (problems from other motors) that it is probably the power pack but I want to make sure($300.00). I have a fluke multi meter at work that will measure Min/Max, will this work or do I need a DVA meter?? Any help would be appreciated.
Thanks,
Lee

 

[seahorse5]

Re: Can i use a Fluke meter with Min/Max fuction to test DVA readings

You can get by with a DVA adapter for your meter, you do not need a whole new specialty meter.

Try esitest.com or rapair.com for the adapters

 

[JustJason]

Re: Can i use a Fluke meter with Min/Max fuction to test DVA readings

yes you need an adaptor... i run flukes (an old 8 and a new 88V) and they require a dva to diagnose outboards

 

[Leeman Seaman]

Re: Can i use a Fluke meter with Min/Max fuction to test DVA readings

Ok, I have a fluke meter at work that I can use and wanted to know if one with a Min/Max function would work.

 

[eli_lilly]

Re: Can i use a Fluke meter with Min/Max fuction to test DVA readings

Ok, I have a fluke meter at work that I can use and wanted to know if one with a Min/Max function would work.

The pulse happens too fast for the meter to register, even with peak hold.

-E

 

[Barnacle_Bill]

Re: Can i use a Fluke meter with Min/Max fuction to test DVA readings

I've got one of the older model 87 flukes and curosity got me to looking at the manual. In the min/max mode I can set it for 1ms response time for peak readings. Wouldn't that be fast enough? If not I've got a schematic somewhere for building a direct voltage adaptor (DVA). All it requires is some wire, a diode, and a capacitor, and a 1 meg resistor.

 

[Xcusme]

Re: Can i use a Fluke meter with Min/Max fuction to test DVA readings

Yup, DVA adaptor looks like this..

http://esitest.com/cart/640.html

 

[eli_lilly]

Re: Can i use a Fluke meter with Min/Max fuction to test DVA readings

If not I've got a schematic somewhere for building a direct voltage adaptor (DVA). All it requires is some wire, a diode, and a capacitor, and a 1 meg resistor.

There's your ticket. It is an insanely simple circuit, just an RC network to buffer the pulse.

I don't know the math on the 1ms peak resolution, 2K RPM is 33 revs/sec and there's like 12 pulses per rev. That's like 400 pulses per second or one pulse every 2.5ms . I don't know the pulse width, though, which is probably the actual issue.

-E