Wave form

[WGB]

You guy are probably tired of me asking about the Hz of my Voltmaster head.
Well yesterday I had the scope on my ST and Voltmaster.
Also if you guys remember I started a thread about PF and cleaning wave forms.
We talked about PF correction boxes=capacitors, and friend of mine selling a product that corrected PF and harmonics.
Well he was over too.
So here is what we found.
ST before his box turned on and after.
The wave forms on both ends are with the box on, two in the middle are the box off. It did help!
The blurry pics are of the Voltmaster(was trying to do too many thing at once) doesn't really show it but the wave form is worse than the ST!
http://www.flickr.com/photos/39282821@N07/sets/72157624118371744/

[WGB]

Sure wish mine looked like RCAvictims STC wave form!

[mobile_bob]

kind of ragged waveshape huh?

the non st head, is it a brushless unit?

almost looks like there is some slipring/brush contact issues going on?

one thing is for sure, it is easy to see how the killawatt is getting confused on hz
its a wonder it doesn't read twice or three times the hz with the odd peaks in there.

i wonder what the output would be like if you took 240volt and put it through a step down transformer
to get the 120vac? that might smooth it up some?

bob g

[WGB]

kind of ragged waveshape huh?

the non st head, is it a brushless unit?

almost looks like there is some slipring/brush contact issues going on?

one thing is for sure, it is easy to see how the killawatt is getting confused on hz
its a wonder it doesn't read twice or three times the hz with the odd peaks in there.

i wonder what the output would be like if you took 240volt and put it through a step down transformer
to get the 120vac? that might smooth it up some?

bob g

Thanks Bob
Yes the non ST is brushless, and suppose to be less than 5% total harmonics.

[mobile_bob]

sure looks like a lot more than 5% to me!

maybe there is a fault in the head?

seems to me iirc the brushless use a pair of diodes mounted in the rotor, maybe one has a bad connection?

bob g

[WGB]

sure looks like a lot more than 5% to me!

maybe there is a fault in the head?

seems to me iirc the brushless use a pair of diodes mounted in the rotor, maybe one has a bad connection?

bob g

I'm going to give them a call Monday. Dosen't have two hours run time.

[Ronmar]

sure looks like a lot more than 5% to me!

maybe there is a fault in the head?

seems to me iirc the brushless use a pair of diodes mounted in the rotor, maybe one has a bad connection?

bob g

I agree, it looks as if something is wrong with the excitation in the brushless head...

[WGB]

I called today, people at Winco/Voltmaster are very accomadating.
He asked how long I've had the unit, told him 8 months with 2 hours run time.
He was surprised because the serial # was april 2006! I'm Not happy!
Anyway I'm going to send a pic of the sine wave for him to check.
Also invoice with date.
He seamed to think something is wrong.
I'll let everyone know what I find out.