[time-nuts] Fast rise time pulser

Bob kb8tq kb8tq at n1k.org
Tue Oct 17 13:06:14 EDT 2017


Hi

One of the practical uses of a fast edge source is to measure the bandwidth / performance of a 
high speed acquisition circuit.  It’s rare to find one that will not limit a ~30 ps rise time edge.

Bob


> On Oct 17, 2017, at 3:30 AM, Magnus Danielson <magnus at rubidium.dyndns.org> wrote:
> 
> For the HP54542A oscilloscope with 500 MHz BW, the risetime of the input will dominate. Recall that the total risetime is the square root of the signal and input channel risetimes squared and summed. So, it is expected. If he was using a CSA803 he would see significantly less.
> 
> Cheers,
> Magnus
> 
> On 10/16/2017 10:57 PM, paul swed wrote:
>> It did make it to the post.
>> Question. Rise and fall times are sub 40ps is that a typo in your email.
>> Regards
>> Paul
>> WB8TSL
>> On Mon, Oct 16, 2017 at 10:45 AM, BIll Ezell <wje at quackers.net> wrote:
>>> I rushed out and ordered one, and I have to say, I'm impressed.
>>> The test report it came with states 34.4 ps risetime / 32.13 ps falltime
>>> 8.6% overshoot measured with a Tek CSA 803A.
>>> I hooked it up to my wonderful HP 54542 2 Gsamples/sec scope and got
>>> exactly what I would expect, 496 ps risetime 7.6% overshoot.
>>> 
>>> Screenshot attached, don't know if it will actually make it into the post.
>>> 
>>> This is exactly what I need for adjusting various of my time-related
>>> instruments.
>>> 
>>> --
>>> Bill Ezell
>>> ----------
>>> The day Microsoft makes something that doesn't suck
>>> will be the day they make vacuum cleaners.
>>> Or maybe Windows 10.
>>> 
>>> 
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