In article ,
says...

On Sun, 12 Mar 2017 10:13:05 -0400, Mike Rotch
wrote in

On 03/12/2017 07:17 AM, CRNG wrote:
This thread reminds me of a surge protector question I have.

I have a Tripp-LIte surge protector

https://www.tripplite.com/isobar-4-o...es~ISOBAR4220/

It has two "filter banks": one marked (50db) and the other (75db).
What do those number mean? Different levels of surge protection?


The Isobar has internal barriers (isolated filter banks) that prevent line noise from causing A/V distortion, computer lock-ups, data errors and similar problems. Filtering is accomplished by combining toroidal chokes, ferrite rod-core
inductors, HF/VHF capacitors and layers of metal oxide varistors into isolated filter banks that remove EMI/RFI interference.

Oh, thanks very much Mike. I know very little about electronics. BTW,
which provides the greater barrier to line noise: the 75db I presume?

The higher the DB, the greater the barrier to line noise is correct.
With out a refference the db does not give much information. It should
be refferenced to something like milliwatts or millivoltes.

The 25 db of difference is about 300 times as much, but with out a
refference that number does not mean much.