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Re: Testing Scope Probes
I'm not sure what you mean. One can't simply look at the BNC Tee and declare that the ~120ps length of each arm is so short at 500MHz that it is irrelevant. You have to analyse how the system will
By jmr · #143325 ·
Re: Testing Scope Probes
Yeahbut but the phase difference shouldn't matter for a comparison of the two waveforms at a high enough sweep rate, surely, as you can visually eyeball individual cycles...?
By Jinxie · #143324 ·
8340B option removal
Has anyone had occasion to remove option 006 and restore the pulse modulation feature on an 8340B? The one I¡¯m looking at seems to have all the hardware in place (A21 pulse modulator board, A9 low
By Steve - Home · #143323 ·
Re: Testing Scope Probes
If the 3.5GHz 'known good probe' probe is a passive Zo probe, it might look like 500R in parallel with 1pF up at UHF. By contrast, a 10073C will typically look like about 60R in parallel with about
By jmr · #143322 ·
Re: Testing Scope Probes
One take-away from all this discussion is that it's very tricky to make good measurements at higher frequencies, especially with scope probes. It's hard enough even comparing probes attached to fairly
By Ed Breya · #143321 ·
Re: Testing Scope Probes
Jmr, The 3.5Ghz known-good probe is a *passive* one! And the other chap who said it was a 400Mhz scope - it's the 350Mhz model in fact.
By Jinxie · #143319 ·
Re: Testing Scope Probes
There seems to be lots of anecdotal evidence in the responses, and a few technical problems with the measurement setup of his original post. Is he following any one of many documented procedures here?
By VE6WMR · #143318 ·
Re: Testing Scope Probes
OK thanks. Bear in mind that tests are being done up to 500MHz and your T piece method relies on the voltage at both probe inputs being the same. This is in some doubt if you use a completely
By jmr · #143317 ·
Re: Testing Scope Probes
LeCroy makes a test fixture, part # PCF200 that is just the ticket for testing high frequency ¡®scope probes. You can view pictures of it using the Googly what¡¯s it on the InterWeb Thingy. It has
By billyatams · #143316 ·
Re: Testing Scope Probes
@JMR If you read Jinxie's first post to this thread you will find she does have a "good" probe: "The scope I am using for this test is a 350Mhz Tek analog one and it can 'see' waveforms perfectly well
By Robert G8RPI · #143315 ·
Re: Testing Scope Probes
There's a nice app note about probe impedance and using them by HP: It has a comparison of tek and HP probes that does not include the 10073C, but shows the concepts with examples and charts...all for
By John Griessen · #143314 ·
Re: Testing Scope Probes
Honestly Jinxie, you did. That is why you started asking questions. If everything looked right to you, you wouldn't have thought a thought about it. -Chuck Harris <paul666@...>
By Chuck Harris · #143313 ·
Re: Testing Scope Probes
You can try the T piece method as long as you accept that it won't actually demonstrate the expected bandwidth of the probe. It will show differences between the probes. You will have to be wary of
By jmr · #143312 ·
Re: HP/Symmetricom 58531A GPS Timing Receiver Analysis & Control software
Thanks, Robert. When I have the time to jump through all of Microchip's hoops I will investigate. Greg
By Greg Muir · #143311 ·
Re: Testing Scope Probes
Perhaps I can combine elements of the best methodology from posters here to get the best results. The thing I'm concerned about with using T adaptors is I don't know what they're specified to. I've
By Jinxie · #143310 ·
Re: Anyone with a 3586B A80 board?
FYI - I got the mainboard off the unit last night.? For those who may have this issue in the future, it is possible to get this board off without removing all of the cards.? You do have to remove
By Matt Harris · #143309 ·
Re: Testing Scope Probes
Please define the 'known good probe' in your test setup? Does Jinxie have one? I thought the aim of the exercise was to demonstrate the BW of the ebay probe. If you put two probes in parallel and
By jmr · #143308 ·
Re: HP 05315-60007
It is the optioal 10MHz TCXO for the HP 5315 Counter. It's covered in the service data.
By Michael A. Terrell · #143307 ·
Re: Testing Scope Probes
JMR said: "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
By Robert G8RPI · #143306 ·
HP 05315-60007
What device(s) was this oscillator made for?? Is there any documentation for checking whether the board functions correctly?? The board is marked SERIES 1824. Thanks -- Joe White KW4YW
By Joe White · #143305 ·
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