Re: HP8753 error, "CAUTION: NO IF FOUND: CHECK R INPUT LEVEL"
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Hi ? Oh my god. That just shows how little I am familiar with the old HP VNA. I assumed I could measure on say the R input. I used to use a HP4195, and as far as I remember we did it that way for G/P measurements (comparing R/A inputs) ? Anyway I hooked the HP8753D up to the test set, and now it works. You all saved me a lot of worry ? ? I still have the HP8753ES that shows an error. ? About the connection, I cannot see that. On the front there is only the 4 N connectors: ? https://www.electronicsdesign.dk/tmp/frontpanel.jpg ? On the back: ?
? I have an external testset for that one too, only 75ohms (HP86045B) ? Regards ? Klaus ?
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From: [email protected] <[email protected]> On Behalf Of Dave G8KHU
Sent: 3. november 2023 08:28
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] HP8753 error, "CAUTION: NO IF FOUND: CHECK R INPUT LEVEL"? You don't say which model type you have, but assuming its the ES (as you say :"Seems the 8753ES has a known problem with YIG oscillator") then as Burt says you need the link between R Out and R In. This is on the lower right of the front panel - there are two SMA sockets labeled "R Channel" "In" and "Out". For normal operation these should be linked - otherwise you will get all sorts of error messages. Ex HP it's a small diameter coax (086 semi-rigid) and easily damaged. Any shortish SMA - SMA coax suitable for the maximum frequency of the 8753 can be used there to test.
If you could confirm which model it is then it would be very helpful so you can get more targeted help. For example Alan's comment is absolutely correct for the earlier versions which had an external test set eg A, B etc - but it won't help with the ES as that model has an integrated S parameter test set.
Dave
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