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BNC TEE circuit considerations - RF Cafe Forums

Because of the high maintenance needed to monitor and filter spammers from the RF Cafe Forums, I decided that it would be best to just archive the pages to make all the good information posted in the past available for review. It is unfortunate that the scumbags of the world ruin an otherwise useful venue for people wanting to exchanged useful ideas and views. It seems that the more formal social media like Facebook pretty much dominate this kind of venue anymore anyway, so if you would like to post something on RF Cafe's Facebook page, please do.

Below are all of the forum threads, including all the responses to the original posts.


Xconnect
Post subject: BNC TEE circuit considerations Posted: Sat Feb 07, 2009 10:25 am

Lieutenant

Joined: Thu Jan 08, 2009 10:27 pm
Posts: 2
Looking for circuit information on the effects a BNC has when it splits a line into two. (source splits to 'line A' and to 'line B'. Line B is a 1M ohm scope input. Line A goes to another scope input which is 1M as well. Is it true in this scenario the total 'load' seen by the source is now 500K?


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IR
Post subject: Re: BNC TEE circuit considerationsPosted: Sat Feb 07, 2009 4:06 pm

Site Admin


Joined: Mon Jun 27, 2005 2:02 pm
Posts: 373
Location: Germany
Hello Xconnect,

There is some information missing in your description:

There are also other impedances involved like the impedance of the source and the characteristic impedance of the BNC connector (and also cables?), which have to be taken into consideration.

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- IR


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yendori
Post subject: Re: BNC TEE circuit considerationsPosted: Sun Feb 08, 2009 10:35 pm

General


Joined: Thu Sep 25, 2003 1:19 am
Posts: 50
Location: texarcana
At least at DC to Low Frequency it is true you will see 500K ohms at the input of the TEE.


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nubbage
Post subject: Re: BNC TEE circuit considerationsPosted: Tue Feb 10, 2009 4:15 am

General


Joined: Fri Feb 17, 2006 12:07 pm
Posts: 218
Location: London UK
Also, buried in the small print of the specs for the so-called 1 megohm load device, might be reference to the shunt capacitance. At high frequencies almost certainly this factor will dominate the impedance calculation.

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