Re: High frequency impedance of a neon sign transformer

To: tesla-at-grendel.objinc-dot-com
Subject: Re: High frequency impedance of a neon sign transformer
From: jim.fosse-at-bdt-dot-com (Jim Fosse)
Date: Sun, 07 Apr 1996 17:58:58 GMT
>Received: from bdt.bdt-dot-com (root-at-bdt-dot-com [140.174.173.10]) by uucp-1.csn-dot-net (8.6.12/8.6.12) with SMTP id NAA04091 for <tesla-at-grendel.objinc-dot-com>; Sun, 7 Apr 1996 13:00:29 -0600




Freq.              Secondary Impedance

	    15K,60m 12K,60m	15K,60m		7.2K,1.4A
	     Ed's   	Malcolm's	Jim's Neon	Pig
------------       -------	---------------	-----------------
----------
	            |	                   |
	            V	                   V
60Hz				150,000		26,000

100Hz              1.2Mohm        		260,000		44,000

1kHz               600kohm        		~2.2meg		1.4meg

10kHz              35kohm      >50K   	220,000		1meg

100kHz             4.2kohm     29.8K	24,000		80,000

200kHz				12,000		45,000

300kHz             1.8kohm    11.5k       	8,000		29,000

Self resonance			3.35Khz		
						
note: my neon secondary measurements were from one HV terminal to case
ground, at least at 60 and 100Hz the full secondary values were 4
times the half secondary values.  

The pig was my "new" Westinghouse 10+ LL-65. a single bushing 10KVA
7.2KV? distribution transformer.  I included the pig numbers for
Scotty.

I used a 1 volt peak voltage applied across a series combination of a
carbon comp pot and the secondary under test. The function generator
was adjusted for 1 Volt, the pot was adjusted for 1/2 volt across the
secondary. The pot was then disconnected and measured with my Simpson
260 multimeter.

I also find it very curious that we are getting such different
numbers.

	Regards,

	jim