[Test-Equipment] Help ID NBS (aka NIST) Noise Source

[GandalfG8 at aol.com]

In a message dated 04/01/2010 06:07:17 GMT Standard Time,  
sacramento.cyclist at gmail.com writes:

It was apparently made by Aerospace Research Inc. of  Boston,
Mass.  There is a date on the inside meter case of May,  1964.  The
dynamo label on the front panel says checked in 1971.   I can find no
mention of that company anywhere.  Anyone know what  became of
Aerospace Research?  Before I opened it up, I figured it  would have a
tube.  But, I don't think it does...unless there is a  very small one
inside the internal cage which you can see against the front  panel on
the inside.  Over all, the thing is in remarkable  shape.  The range
switch is quite stiff though.  I have not tried  to power it on.

If anyone recognizes this  thing, please let me know.

Have a  look.

-- 
I've been wondering lately..."Where am I going and why AM  I in this
hand basket??"


--------------------
Hi Moses
 
A quick Google returns this link, different unit but pretty  similar.....
 
_http://www.prc68.com/I/NSLB.shtml_ (http://www.prc68.com/I/NSLB.shtml) 
 
As per Brooke's comment, I would expect it to use a noise diode, perhaps  
inside the cage behind the output connector, which probably leaves the grey  
rectangular module as being a screened line transformer.
 
Just guessing though, never seen one before, if you email Brooke via the  
site perhaps he could point you towards more information.
 
regards
 
Nigel
GM8PZR