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Author Topic: What is this RF item?? (SOLVED, RF power sensor bulkhead)  (Read 1107 times)

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Offline PartialDischargeTopic starter

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What is this RF item?? (SOLVED, RF power sensor bulkhead)
« on: June 12, 2018, 03:03:44 pm »
Found this thing laying around, what is it??, It has a N Plug-Male on one side
« Last Edit: June 12, 2018, 04:54:04 pm by MasterTech »
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Offline Tony_G

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Re: What is this RF item??
« Reply #1 on: June 12, 2018, 04:27:57 pm »
Looks like the bulkhead assembly from a HPAK 8400 series H-variant sensor. If you download the manual for the 8481H there is a procedure to test that assembly.

Actually looking closer at the 2nd image, there should be 2 very fine gold wires coming from those little bumps on the ceramic insert (which will be the matched thermocouples (or diode detector if this is an earlier model). Anyway those wires feed into the input amplifier and are critical to the correct working on the unit - So if they're missing then it might already be dead or unusable.

TonyG
« Last Edit: June 12, 2018, 04:34:26 pm by Tony_G »
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Offline PartialDischargeTopic starter

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Re: What is this RF item?? (SOLVED, RF power sensor head)
« Reply #2 on: June 12, 2018, 04:53:37 pm »
Yes, spot on. Those two wires are broken. I managed to turn those 4 small allen screws and take out the ceramic insert.
Should take the microscope out but I feel too lazy right now.
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Offline Tony_G

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Re: What is this RF item?? (SOLVED, RF power sensor bulkhead)
« Reply #3 on: June 12, 2018, 07:44:32 pm »
Good write up of the thermocouple here - http://www.hpl.hp.com/hpjournal/pdfs/IssuePDFs/1974-09.pdf

TonyG
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