BNC TEE circuit considerations - RF Cafe Forums

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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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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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Posted  11/12/2012