HP 4815A RF Vector Impedance Meter

[@khristophertaylor811]

Thank you very much I have just acquired a 4815 a and well you're one of the people are going to teach me how to use it thank you

[@dalrob9969]

I need a probe. Or plan's to build one. This is a great machine, and I have a product I want to design that works in the freek range. Any help would be greatly appreciated. My machine is brand new our if the Box, a sleeper storage treat. But no probe. :(

[@dalrob9969]

Excellent instruction of this device, I have one , and need a probe. Thank you, Sir.

[@w1qg]

Hi, Regrettably without the probe the instrument does not even make a good door stop. At this moment (3/4/2024, 8:25AM PST) there is a probe with accessories (RARE) on eBay for circa $900. That is the going rate even without accessories. As a lab project, this link shows an attempt at building a probe: www.davmar.org/pdf/HP4815A-DK.pdf . I was not impressed by the results. It seems to me that you would need a probe as a reference to build one. Even getting the probe apart seems not to be obvious. I have a second instrument with probe, but don't want to split the pair. Sorry that I don't have better news. Dick

[@dalrob9969]

@w1qg I found a pdf on how to build one. it's online, including SMT parts and op Amp. I'm on it. Very simple build, with brass housing. Custom plug in , and test probe, including T probe test jig for resistor testing. And by the way, it's 360 degrees. Not 90. I got the manual.

[@dalrob9969]

@w1qg Thanks, I saw the kit, Canada guy has the real deal with all the test jigs. 900 bucks.

[@henryfeng6556]

Any info on how to disassemble the probe?

[@w1qg]

Hi Henry, Regrettably, I have none. It is interesting that the schematic of the probe is provided in the manual, but that is about it. It would appear that simply unscrewing the inner collar would do it, but I am not going to mess with it: if it ain't broke don't fix it. Have you tried to take one apart? Dick

[@henryfeng6556]

Hi Dick, I'm trying to fix my probe, the inner collar seems sealed or need special tool to unscrew. Henry

[@w1qg]

@@henryfeng6556 Hi Henry, Bummer on the sealed collar. You might try the the HP group on Groups.IO. Someone there might know. I'd be interested in what you eventually find out. Dick

[@dalrob9969]

I need one, a probe. Or can I BUILD ONE. My unit came brand new still in the box, from a storage unit in San Jose, sadly no probe. Help me, please.