DVA meter Do i need one.

[LoneWolf_2010]

Do i need this dva meter to check my classic 50 i have seen threads on how to make one but dont know where to buy the stuff or really were to start can anyone help thanks.I have a fieldpiece mulit-meter that i use for HVAC work will this be ok i guess i am learning and want to hear from some of the experts on here. I know one thing i find this really interesting work thanks again.

 

[jasonl]

Re: DVA meter Do i need one.

i'd like to tag along also, i have a fluke 87v meter as well but it is a digital rms but it does have a peak and an autohold

 

[road.ripper]

Re: DVA meter Do i need one.

hey guys i have details on how to make a DVA adaptor for a multi meter , im going to get a friend to help me make it i will show in post after i get it done

here is what i have,

hopefully i can figure it out ,im lost with electronics ( i really should have paid attention in school ).

road

 

[achris]

Re: DVA meter Do i need one.

Do i need this dva meter to check my classic 50

Yes....

i have seen threads on how to make one but dont know where to buy the stuff

Try a Tandy or RS Components. Or any store that sells or repairs electronics.

or really were to start can anyone help thanks.I have a fieldpiece mulit-meter that i use for HVAC work will this be ok i guess i am learning and want to hear from some of the experts on here. I know one thing i find this really interesting work thanks again.

It's 3 components, a diode, a capacitor and a resistor. Just make sure you get components that are rated higher than 400volts.

C........

 

[road.ripper]

Re: DVA meter Do i need one.

i went to my friends to make one tonight but he didnt have a capacitor rated for 22uf over 250 v.
but i did learn how to make it , tomorow i will hit the electronics surplus supplier and get the proper parts to build it .

road.

 

[wtinnr2]

Re: DVA meter Do i need one.

I just recently built one from the plans on here and it works fine. I also have several of the 2.2 caps that I will sell very reasonable. Had to buy a lot of 25 when I built mine. Will sell for 1$ each plus postage. send pm if interested. Was fun building.

 

[mke039]

Re: DVA meter Do i need one.

I have heard of this DVA but have no idea what it is used for. I use my multimeter all the time and would be lost without it.
Can someone explain what the DVA is used for?
Thanks!

 

[j_martin]

Re: DVA meter Do i need one.

I have heard of this DVA but have no idea what it is used for. I use my multimeter all the time and would be lost without it.
Can someone explain what the DVA is used for?
Thanks!

The dva stores and reads peak voltage. The dva adapter circuit, in classic electronics parlance, is an integrator circuit. The pulses charge the capacitor until it is at the peak pulse voltage. The resistor across the capacitor discharges it in a few seconds for safety.

The capacitor value is not critical. If it's low, the reading will be a little low and the needle may wiggle. If it's too high, it will take longer to crawl up to peak reading. Likewise, if the resistor value is too low it'll cause low reading and ripple. If it's too high, you might get bit after you disconnect.

hope it helps
john

 

[mke039]

Re: DVA meter Do i need one.

Ok thanks for that. My question is why (and where) do you need to see peak voltage?

 

[j_martin]

Re: DVA meter Do i need one.

Ok thanks for that. My question is why (and where) do you need to see peak voltage?

Whenever the designers tell you that's the parameter that matters, such as an ignition coil drive pulse.

I've looked at most of the circuits on a mercury engine with an oscilloscope. The waveforms are not sinusoidal, but various pulses or distorted waveforms. RMS would mean nothing in checking them, but peak voltage is significant, thus you need to use either an o-scope or a DVA to test them.

hope it helps
John

 

[road.ripper]

Re: DVA meter Do i need one.

I got my parts to make 2 DVA's, bought them at my local electronics shop for only $6.21
now I just need to find time to solder them up and im good to go.

 

[road.ripper]

Re: DVA meter Do i need one.

i made my own D.V.A.
and it even works !

i got enough parts to make 2 for less then $10.00 CDN.

 

[hdman97]

Re: DVA meter Do i need one.

I just recently built one from the plans on here and it works fine. I also have several of the 2.2 caps that I will sell very reasonable. Had to buy a lot of 25 when I built mine. Will sell for 1$ each plus postage. send pm if interested. Was fun building.

wtinnr2 I sent you a pm