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Lothar, On 9th August 2023 you offered for sale a 130 MHz to 20 GHz 8703A lightwave analyzer. https://test-equipment-for-sale-wanted-or-exchange.groups.io/g/main/message/4859 You stated that had

What do you think is going to be special about the 10073C that means the Rp will stay at 2.2Meg even up at VHF and UHF? I just measured one for you. Rp falls in a similar way to other x10 scope

Posts crossed agin, I'm doing other things. The Tek example is a 10M 100MHz probe. That is not the same as the 10073C.

I've been following this discussion with interest, no particular expertise to contribute. Is your statement above based on the leads and other parasitics adding some inductance, which starts to cancel

I've just measured a 10073C probe on an analyser for Rp Cp and XP vs frequency up to 500MHz. See the plot below. There should be no surprises in the result below as many x10 scope probes will look

No, I've not measured a high impedance 'scope probe on a VNA (which is typically intended for 50R systems). I'm away from home on business so won't be doing so any time soon (I have a number of VNAs).

If it helps, look at the Tek datasheet in the link below. It shows Rp vs frequency for a typical 100MHz x10 scope probe. The input Rp for the 10073C will be fairly similar vs frequency. It will fall

Jeez, I've just read all the recent replies. Have none of you ever measured a x10 scope probe before? You can't assume the Cp will remain at 12pF up at UHF. Also, the Rp will fall with increasing

No I'm not counting the capacitance twice. Rp is a measure of parallel resistance not parallel capacitance. At 400-500MHz, the 10073C will load a circuit in a similar way to the loading caused by a

You saved my day... Raymond

Hi Robert, Is that meant as an answer to my question? I'd say (HP spec) Rp = 2.2MOhm, Cp = 12pF, resulting in |Xc| less than 30Ohm @ 500MHz, or no? I'm confused... Raymond

Crossed with Raymonds reply. I was assuming the probe input capacitance was 12pF. Seems odd to split the reactive impedance. Robert.

Hi Gianni, I'm one of the many that have admired your beautiful books from the beginning but haven't posted about that. As regards your above post, I'm not sure what you mean by "both": Two NiCds?

But you have Rp and 7pF probe capacitance. That is counting the input capacitance twice.

Not relevant for the discussion but what's the math behind that? HP 10073C data 2.2MOhm // 12pF. Raymond

I have one E4406A with the same problem. I didn't disassemble it. I saw comments that could be the power source. Do I check the power source directly? It has the same characteristic sound. And it does

It would have been interesting to measure the lead levels in consumer electronics techs 50 years ago (and still today) who lit cigarettes with soldering irons. Adding lead to that menagere of poisons

The R2 value of 60R is the equivalent Rp (parallel resistance) of the 10073C at about 500MHz. If you measured the 10073C with an impedance analyser down at low frequencies (eg in the kHz region) Rp

Hi, Where is R2 derived from? The 10073C input resistance is 2M2 not 60R. You have included the capacitance so can't be that unless you are double accounting? What is the delta at 350MHz? Robert.

Of course, what this means in reality, is that you can expect to achieve slightly confusing results if you used this Tee setup to test the 10073C against a near perfect Zo probe for frequency response