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JMR, thank you very much for the very thorough and well set out reply (and all your contributions on the topic as well of course). I'd be interested to see if I can duplicate your results with my own

I went right through the manual again. The "Wform Save" button saves the waveform to one of 4 novolatile memories. I cannot do a measurement on them, in fact the manual says you can't. So this is not

I also found an old VNA measurement of my 10073A scope probe. You can see from the blue trace that Cp falls up at VHF and UHF. It falls to about 5pF. You can also see the knee in the green Xp trace

In case anyone claims that a 50R VNA can't reliably measure small capacitances at V/UHF, I've dug out an old VNA measurement I made of an exotic 3.3pF SMD cap up to 2GHz.? I measured it on a VNA and

This is getting ridiculous now... The Cp and Rp of a scope probe is very easy to measure up at VHF using a regular 50R lab VNA. Here's another graph from Tektronix showing how Xp changes up at VHF. It

Thanks JMR. I have been using most of the shift measurements like freq and risetime, all on any channel as the source. F seems to mean Function and M is for Memory. I don't know how to use them. Save

Not sure what the source of the graph is or the testing methodology, but there's also the possibility of measurement error rather than any quirk in the probe. Perhaps we're looking at an effect that

Hi. That's what I'm wondering too. But... the "wrinkle" in Xp at UHF, could perhaps be be due to stray low value inductance, or dielectric loss at UHF. I need to dig deeper. As always, The Devil is in

I haven't used a 5454x scope in a long time, but the measurement tool is quite easy to use if you just want to do simple stuff. To measure Vac rms on channel 1 simply press the blue (shift) button and

I'm not sure if there's still some confusion with the graph I posted up so I'll have another go... I've now amended it with markers at 1MHz, 10MHz and 100MHz. See the graph below. At 1MHz Xp is about

Dave, I *assume* he means capacitive *reactance* rather than pure capacitance..?

OK, so what is the physical mechanism that causes that? (Citation please.) Dave KBV

I have several manuals including a paper service manual. I went through the entire manual looking for the information. Unfortunately the manuals are adapted from the 54540A manual and the two are

Good morning Peter from Australia.? While I don't have this CRO (I have a HP 54600) I suggest look at 54542C 4 Channel 2 GSa/s Color Digitizing Oscilloscope [Obsolete] | Keysight (

Gianini,The reason that you had 2 different batteries in your 8568B (it used to be an A before the B mod), the person that did the mod did not remove the 3 cell battery pack, which he was supposed to

I would and did. I have 48V solar with two 230AH battery banks in parallel (but can separate them if I need to); this runs a true sine wave 240/120VAC inverter. Some heavy 240/120VAC wiring to the

Appliance bulbs in particular.? Are halogen considered incondescent? They are.? May not quite work the way you think, but they are. They're higher temperature than normal incandescent.? Definitely

Ahhh, I'll look again. Went yesterday, and everything I saw was LED. I'll look at appliance bulbs in particular. Are halogen considered incondescent?

They sell them in the local Home Depot, appliance bulbs and halogens bulbs.

I read every page! Wonderful stuff. -Dave -- Dave McGuire, AK4HZ New Kensington, PA