[BARC-List] Waveform of Costco generator vs Honda vs Dayton

[J. Forster]

The Costco waveform does not look much like an inverter output. In
addition to the glitches, there is also considerable high frequency
ringing.

Were the generators OC or under load for the pics? If under load, what was
the load?

Could the glitch have been caused by a something like an SCR or TRIAC
dimmer? Or, perhaps the Costco unit does voltage regulation with a phase
controller from it's output to the DC field?

A simple way to tell is does the glitch position shift earlier with
varying resistive load.

-John

==============


> ----- Original Message -----
> From: "Steven L. Finberg"
>
>> I'm sure its just a cheap inverter.
>> These days it is easier to regulate freq and voltage
>> electronically.  Something like make unregulated LV
>> with something like an automotive alternator and
>> then use a switching inverter to make  115V 50/ 60 Hz.
>> Honda pioneered it... then the mainland chineese
>> started making knockoffs and eliminated all the "extra"
>> parts in the output filtering.
>>
>> I wouldn't be suprized  to open one up and find
>> empty holes on  the PCB for those parts...
>>
>
> I really doubt that there is any "inverter" in the Costco. Cheap (and
> mid-priced) stand alone inverters produce "modified sine wave" power ... I
> prefer to call it "modified square wave" power. Full sine wave inverters
> cost considerably more. I've put cheap inverters on the scope and the
> waveform looks nothing like the Costco. It is just a generator .. a cheap
> generator made in China .. and you get what you pay for.
>
> Richard Amirault
> N1JDU
> http://bostonfandom.org
>
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