Hi Bob:
A resonate transformer may solve your problem. I added one to my first
computer, See Fig 1.
http://www.prc68.com/I/comp.shtml#SWTP
http://www.prc68.com/I/Images/SWTP-01b.jpg
The oval shaped silver can oil capacitor is connected to a winding on the transformer and resonates at 60 Hz. Think of
it as a filter centered at 60 Hz and as an energy storage device.
This removes line spikes and fills in narrow line drop outs.
https://en.wikipedia.org/wiki/Voltage_regulator#Constant-voltage_transformer
Here are models with capacities of: 300, 600, 1200 & 1800 VA:
http://www.hammondmfg.com/CVR.htm
Just search for "Constant-voltage transformer".
--
Have Fun,
Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html
The lesser of evils is still evil.
-------- Original Message --------
I hope this isn't too far off topic, as this is having a big impact on my
testing.
I decided to run an A/B test on one of my GPSDOs: comparing the phase of the
two 10MHz output channels. In the middle of the night, there was a long series
of 35ns pops in the phase data. Strangely enough, there was nothing in the
data collected directly from the unit involved. The preceding two days we had
had a number of switching transients where the lights blinked but nothing shut
down. So, putting one and one together, I suspect that a fair percentage of
the strange results I've been getting has been power-grid related.
So, what to do? I've been looking at UPS devices, and I don't even understand enough to waste my
money on a bad one. The two big questions seem to be "on-line" and "sine
wave". Make that three: can I trust the mfgs claims? Is there something affordable that
could run a pair of 5370s and maybe another 50W worth of DUTs for up to an hour or two and not be
prey to power-line transients? Or would it be more cost effective to somehow monitor the power
line for spikes or phase jumps and blow off tests or cut out the offending data? From time to time
we get a thread on power-line nuts. Should I have been paying more attention?
Bob - AE6RV
-----------------------------------------------------------------------------------
GFS GPSDO list:
groups.yahoo.com/neo/groups/GFS-GPSDOs/info
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