if anyone is interested, i have bunch of line conditioner/stabilizers that i have collected over the past couple of years. ebay is killing me so i dunno what to do with them... they are by TOPAZ and i have them in varying power ratings. most of them are brand new. i think the smallest one i have was ~$650 new and it is 1.5KVa. i also have a couple of 2KVa units as well.
i also have some medical grade 220v>110v isolation x-formers.
here is some good info:
Posted by Jacques (A) on February 13, 2005 at 08:49:39
In Reply to: Isolation Transformers? posted by dalcorn on February 9, 2005
at 19:44:00:
Ten year ago, I had to test for EMI our airborne predictive maintenance
computer. I used Topaz 1000W ultraisolation transformer between the mains
and the testbench.
Another time, I made EMI conducted susceptibility testsfrom the mains, and
I had the habit to set an ultraisolation Topaz transformer between the mains
and the LISN (Line Impedance Simulation Network). My main goal was to get
rid of any external source common mode perturbation, in order to make
correct measurements from the standardized CM signals I injected, but not
the neighbor...
Ultraisolation transformers are built this way:
primary and secondary are split in several sections, and completely
separated. Primary cores are surrounded by an insulated copper foil (which
does not short itself thanks to covering insulation. This primary shield is
connected to the ground inlet. Then, another non-self-shorting insulated
copper foil separates the primary/ secondary coils pairs. This shield is
connec ted to the transformer chassis. Then, a third set of
non-self-shorting insulated copper foil surrounds the secondary coils. This
shield is connected to the ground outlet.
A heavy-gauge small coil links the ground inlet to the transformer
chassis, and another heavy-gauge small coil links the ground outlet to the
transformer chassis.
A non-insulated copper foil is used as a magnetic shield/short around the
transformer.
A sheet of steel separates the primary and secondary case.
The result : superb common mode insulation, up to 140dB (!) at 1MHz. Why?
Because, done as it is, the capacitive coupling between the primary and
secondary coils is quite zero (<0.00001pF, yes!), and furthermore, the
symetric construction avoids that some CM noise be changed into differential
noise.
feel free to drop me a line
nism
i would love to part with some of these x-formers and would do it for a real good price...