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Hello, Does anyone can confirm that the I/O-interconnect cord between the HP8703A and its lightwave test set is the same cord as between an HP8753A and its S parameter test set HP85046A or between the

A passive scope probe is more complex the just a resistor divider. Take a look at the original patent for a scope probe. Allen Hill KI4QCK

Anyone who has tried to measure one, that's who! ;)? ? ? ? ? ? ?Jim Ford?Sent from my T-Mobile 4G LTE Device

Just in case this helps someone else I've found it now. My A9 board looks like the one here https://jvgavila.com/hp8753c.htm And as described in the link, the procedure IS detailed in the service

Gosh! Who'd a thought testing a passive probe could be so tricky?

ok thanks, unfortunately totally different layout to my A9 board. the manual isn't very helpful at all.

Yes. The typical instrumentation grade RF source (eg. signal generator) can be modeled as an ideal voltage source in series with an ideal 50 ohm resistance (impedance). It is a desirable condition in

I think the A9 CC Jumper is in position E33-E34. See the picture attached but I am not 100% sure because there were different A9 CPU boards for those series and they have slightly different layout.

A BNC sleeve is exactly what it sounds like it is. It fits over the bare probe tip, making a press fit connection to the inside of a female BNC connector so that you can make a good, albeit high

The problem with trying to do this with two probes in parallel (using a BNC T piece) is that you will end up with double the loading so I'd expect this test method to be doomed to failure if the aim

Do you have the adjustments tab which shows which jumper is the A9 CC jumper ? the manual I have just keeps saying move the A9 CC jumper, but doesn't actually say anywhere which jumper that is on the

Sorry - need a bit of clarification here. "BNC adaptor sleeve" - what is that? Does it fit over the probe tip or something?

I'll try that, Robert, thanks. It'll probably not be today owing to time pressures but I'll report back here in due course...

The 10073C should have come with a BNC adaptor sleeve. So should your "good" probe. To eliminate all loading and source imedance issues connect a BNC T to the signal generator output and directly

It's made for HP scopes and logic analyzers like the 16500C 16700B... Could be...

Yes, it's a Tek 2465A; the highest bandwidth scope I have.

Thanks for the offer, JMR, I'll see how I get on with some other tests before imposing on you. I have asked a colleague to measure the probe impedance at DC and it's a whisker over 2.2M ohms, so

It's worth adding a 10dB pad at the sig gen output to make sure the source Z is close to 50R and then the effective source impedance driving the probe will be about 25 ohms with the output termination

Also, when testing with your sig gen you need to terminate the sig gen with a good 50R load. I'd recommend using a short test PCB with some 50R microstrip on it with a good 50R termination at the far

I have no access to the probe until tomorrow morning. I have not as yet tested to check if it's 2.2M ohms, which sounds like a very simple quick and dirty test and would eliminate it as real or fake