[time-nuts] the care and feeding of LPRO's

Jim Lux jimlux at earthlink.net
Fri Oct 7 19:14:26 UTC 2011

On 10/7/11 11:16 AM, Eric Garner wrote:
> fortunately, everything in the "lab"(basement) is on UPSs so in theory
> the input voltages to the equipment should be pretty constant and I
> was already planning on using a linear supply.

What kind of UPS?  A static inverter?  Most UPSes just feed the line 
through until it goes out of range, and then it switches (within 8-10 
ms) to the output of the inverter.

And even when on inverter, the output voltage regulation isn't all that 
hot, unless you've got a special inverter.  A 5-10% variation in voltage 
from an inverter/UPS wouldn't be surprising.. (why should they try to do 
better.. the goal is to keep the equipment on, not serve as a voltage 

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