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Re: HP 11660A Shunt for HP 8556A


 

Martin,

Well that is the information I was looking for! Thank you, however that is not what I expected. That was option "2" for me. To me it seemed more logical to provide a 600 ohm load to the 600 ohm output of the TG and then provide a 50 ohm impedance to the 50 ohm load. But what do I know! That is why I asked!

I will have to build one like that and see what difference it makes in my measurements.

Thank you Martin. Good find by the way. But I am stumped, like you, as to what the difference is between the "11660A 50 ohm TG Shunt" and the "11048C 50 ohm Feed Thru Termination". Because the Feed Thru's I have measure exactly the same as you say this Shunt does.

Maybe someone will know the difference.

Steve, KJ5RV

danaz.chandler wrote:


There was one on Ebay. I bought it. It has a shunt impedance of 50 ohms and a series impedance of zero ohms....Looks just like a 11048C to me...I don't understand.

Dan in Chandler, AZ
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--- In hp_agilent_equipment@... <mailto:hp_agilent_equipment%40yahoogroups.com>, "martin_u_fischer" <martin.u.fischer@...> wrote:






Hello Steve,

even using resistors of utmost precision you would neither obtain a
600 ohms input resistance (= load resistance for the TG) nor a 50 ohms output resistance (= source resistance for the 50 ohms load).

You may verify this fact by terminating the output into 50 ohms and
measuring the resulting input resistance (which will be 575 ohms). Terminating the input into 600 ohms (= source resistance of the TG) will yield a source resistance of approx. 47.916666 ohms for the load.

Regards
Martin

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