OnTheRoadAgain
Solar Enthusiast
- Joined
- Feb 22, 2021
- Messages
- 643
I have an odd one.
I have not seen one like this before and am not sure how to interpret it.
It is from a brand new Bestek 500Watt Pure Sine wave Inverter. I would say it has a problem.
Do you know how to interpret this?
View attachment 44562
First blush it looks like the ‘scope isn’t triggering properly. Check your probe ground, and play around with the “trigger” controls.
Looks like something from the Outer Limits. Is that with no load?I have an odd one.
I have not seen one like this before and am not sure how to interpret it.
It is from a brand new Bestek 500Watt Pure Sine wave Inverter. I would say it has a problem.
Do you know how to interpret this?
View attachment 44562
Looks like something from the Outer Limits. Is that with no load?
I would think so. Does the signal get cleaner when you put a load on the inverter?If it was an issue of setting the triggering or grounding, wouldn't it be present on all the other AC sources tested?
I think you might have a grounding issue internally in the inverter. If you can take the cover off, without breaking a warranty seal,Roger that.
But.......is it possible it would be triggering improperly for one device and not any of the others?
In other words, other items tested at the same time do not exhibit this irregularity........
Still a possible triggering / grounding issue ?
Is this the same one as yours?
BESTEK 500W Pure Sine Wave Power Inverter
Will recently made a DIY milk crate generator using a Bestek 500w PSW inverter. I'm thinking about buying one but I have a question. There's a YouTube video where the guy uses an oscilloscope to test the waveform on this inverter. The waveform is good with no load but has "ripples" when he loads...diysolarforum.com
Not a problem. You are triggering on the HF noise because the inverter has minimal filtering.
Curious. From your video it was looking good for grid power, so shouldn't be a scope issue.
But, you can't have two Y values for a single X value on a single channel. Ahh... the scope is sampling in the MHz range? So really those are two different X's ... I'm guessing it's a harmonic from how they're generating a sine wave. Probably one side is slightly out of phase with the other, possibly within the efficiency of the device.
What's the waveform look like under load?