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Thread: Agilent 11857D 7mm Cable. Test Data.


Permlink Replies: 2 - Pages: 1 - Last Post: Apr 24, 2012 12:59 PM Last Post By: SOLT_guy Threads: [ Previous | Next ]
SOLT_guy

Posts: 268
Registered: 05/30/09
Agilent 11857D 7mm Cable. Test Data.
Posted: Jul 21, 2010 2:24 PM
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Dear Sir:

I am characterizing a single 7mm cable, I am using three cables total in the experiment. I am doing this because I would like to see if my network analyzer is in need of service.

Can you please send me the experimental velocity factor data for this type of cable (please include as many decimal places that you have available for the velocity factor figure - I don't believe an approximation would be sufficient)? I do not believe this value is printed in the cal kit manual. Also, if possible can you send me a typical table of phase shift values from 300K to 3Ghz (there should be test data stored somewhere)?

Thank you for your courtesy.

SOLT_guy
Dr_joel


Posts: 2,688
Registered: 12/01/05
Re: Agilent 11857D 7mm Cable. Test Data.
Posted: Jul 21, 2010 7:16 PM   in response to: SOLT_guy in response to: SOLT_guy
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I don't think velocity factor is spec'd. I would guess .7 typical, but it might vary .6 to .8; I believe it is a PTFE dielectric but again I don't think it is called out specifically. The cable manufacturer might also change over time, so the only spec to rely on is phase matching, so there is no callout for delay of the cable. Return loss is also spec'd. And, I think they are sent as a pair, so I don't think there is any guarantee that one cable from one set will match a cable from another set.

I don't quite follow how the cable delay would have any relationship to whether an analyzer were working properly.
SOLT_guy

Posts: 268
Registered: 05/30/09
Re: Agilent 11857D 7mm Cable. Test Data.
Posted: Jul 24, 2010 11:01 AM   in response to: SOLT_guy in response to: SOLT_guy
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With respect to your question, I am just checking for measurement consistency, that's all.

Thank you for your replies.

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