[Test-Equipment] RE: Hilborn Loop

[wolfbob]

I vaguely remember something about such a bridge 
measurements. I have a copy of Terman's "Measurements in 
Radio Engineering" around here somewhere but it is hiding. 
There is one on EBAY however:
http://cgi.ebay.com/Measurements-In-Radio-Engineering-Terman-1935-HB_W0QQitemZ200161740365QQihZ010QQcategoryZ50594QQcmdZViewItem

All one line..

I suspect my remembering was related to this text used in my 
sophomore year...

WBob, WB6JPI


----- Original Message ----- 
From: "Hsu, Aaron (NBC Universal)" <aaron.hsu at nbcuni.com>
To: "Discussion of Electronic Test Equipment" 
<test-equipment at mailman.qth.net>
Sent: Tuesday, October 16, 2007 11:01 AM
Subject: [Test-Equipment] RE: Hilborn Loop


> Just to be thorough, I just Googled for "hilborn loop", 
> both words within quotes (just like it's shown here) and 
> it came back with 2 hits.  One is an op manual for a T272 
> Fault Locator (in PDF format).  The manual includes 
> instructions on how to perform a Hilborn loop test and a 
> network equation related to the test.
>
> The second hit is what appears to be a Taiwanese college 
> student's report (in PDF format), but the report is 95% in 
> Chinese.  There are references to Hilborn and supporting 
> network diagrams and equations.  Sorry, though I'm 
> Chinese, I was born in the U.S. and have very rudimentary 
> Chinese reading skills.  I can make out some basic words, 
> but the rest is way over my head!
>
> Between these two PDF files, there might be just enough in 
> the diagrams and equations to give you an idea of how the 
> Hilborn loop works.
>
> 73,
>
>  - Aaron Hsu, NN6O
>
>
>
> -----Original Message-----
> Sent: Tuesday, October 16, 2007 10:10 AM
> Subject: [Test-Equipment] Hilborn Loop
>
> I recently had a Leeds Northrop galvanometer bridge on my 
> bench -- the kind
> that the phone company engineers used in years past to 
> measure cable
> resistances.
>
> In a moment when I had nothing better to do I read the 
> instruction card
> pasted inside the case cover. There was a detailed 
> discussion of the
> Wheatstone Bridge, the Murray loop test and the many 
> varieties of the Varley
> loop (Varley must have been a busy guy!).
>
> There was also a note that the galvanometer switch could 
> be set to a
> position allowing its use in a "Hilborn loop." No further 
> mention of Mr.
> (Ms.?) Hilborn or his (her) loop. No success with Google.
>
> Anybody got any idea what a Hilborn loop is or what it 
> does?
>
> Miles Anderson, K2CBY
> 16 Round Pond Ln
> Sag Harbor, NY 11963
> (631) 725-4400
> e-mail k2cby at optonline.net
>
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