[time-nuts] The home time-lab
alex at pcscons.com
Sun Jul 24 20:28:31 EDT 2016
That is interesting, since the Sola device has a to the line frequency
tuned tank circuit in it, thus the output should not have to many higher
harmonics and should look reasonable close to sinusoidal see here:
On 7/24/2016 4:23 PM, David wrote:
> On Sun, 24 Jul 2016 14:45:02 -0700, you wrote:
>> Hi Bob:
>> The Sola 500 VA transformer is specified to hole up the line voltage for 3 ms. (but not a half cycle of the line
>> I've connected the Sola CVS transformer to the output of the APC RS1500 backup UPS. (needed to replace the 2 batteries
>> in the main unit and probably within a year the 4 batteries in the optional battery pack.
>> The Sola transformer is connected to the output of the RS1500. This will clean up any spikes or narrow drop outs on the
>> AC line since when the AC line is active the UPS does nothing.
>> My hope was that the transformer would clean up the modified square wave output of the UPS, but that does not happen.
>> Video of APC self test showing waveform on scope:https://youtu.be/DLE0mzAt7KY <https://youtu.be/DLE0mzAt7KY>
> Was the Sola transformer under load when you ran the test? I thought
> a minimum load was a requirement for proper operation. Maybe it is
> time to get an online UPS or power conditioner but then you would not
> need the constant voltage transformer.
> Was the peak voltage still 170 volts? If so then maybe it does not
> matter. Capacitive input loads and PFC power supplies should not
>> I think the modified square wave killed my HP 6200 flat bed scanner. The best scanner I've used and no longer made.
> Ouch. That is not suppose to happen but apparently some switching
> power supplies have problems with modified sine outputs even though
> they should not.
> I have been told a couple of times that PFC power supplies are even
> more likely to have problems with modified sine inverters but I have
> yet to find an in depth discussion of the problem. The PFC stage
> should work with any input wave shape.
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