BNC TEE circuit considerations - RF Cafe Forums
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Post subject: BNC TEE circuit considerations Posted: Sat Feb 07, 2009 10:25 am
Joined: Thu Jan 08, 2009 10:27 pm
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?
Post subject: Re: BNC TEE circuit considerationsPosted: Sat Feb 07, 2009 4:06 pm
Joined: Mon Jun 27, 2005 2:02 pm
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.
Post subject: Re: BNC TEE circuit considerationsPosted: Sun Feb 08, 2009 10:35 pm
Joined: Thu Sep 25, 2003 1:19 am
At least at DC to Low Frequency it is true you will see 500K ohms at the input of the TEE.
Post subject: Re: BNC TEE circuit considerationsPosted: Tue Feb 10, 2009 4:15 am
Joined: Fri Feb 17, 2006 12:07 pm
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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