[GreenKeys] WE 3A Noise Measuring Set: Info??

[Roy Morgan]

Greenkeyers,

I have just acquired a Western Electric 3A Noise Measuring Set.  This is 
good, because I have to find the source of noise in my home telephone wireing.

Does anyone have advice on using it, or any technical info?

It is pretty self-explanitory, with summary instructions in the lid.  The 
thing measures "DBRN" which I assume means Decibels, Random Noise.  The 
controls include:

Function
  - Batt (battery check_
  - CAL (set the cal pot)
  - Ng (don't know what this is - noise generator maybe?)
  - BRDG  NM  (I assume it bridges the phone line for Noise Measurement - 
that is presents not a load but a high impedance):
     - 600
     - 900

WTG (A pull out and flip module that sets the weighting)
  - 3KC Flat
  - C-Message (what is this?)

Any advice, tech sheets, or lore welcome.

Roy
- Roy Morgan, K1LKY since 1959 - Keep 'em Glowing!
7130 Panorama Drive, Derwood MD 20855
Home: 301-330-8828 Work: Voice: 301-975-3254,  Fax: 301-948-6213
roy.morgan@nist.gov --