I just received my BNC version pulse generator. Didn't expect it so soon. Invoice 2/10, arrived in US 2/19 for $7.74 shipping. Put it on a LeCroy HDO6104 1 Gz. Rise is measuring 479 psec (10/90). Should be faster.
... Chan 2 the same. Would be more disappointed if it was my scope. I've been storing it for someone for years. At some point it migrated to the primary scope spot on my bench.
That's about right.
SDS5104X is ~400ps too.....faster scope required to resolve a faster risetime.
Using the RT*BW=0.35 (or 0.45) I calculate 731 MHz (0.35) and 939 MHz (0.45). Both shy of 1GHz. Sampling rate of this scope is 2.5 GHz.
Measured a HP 54602B. This thing is terrible for fast one shot captures since it samples once per fortnight, but it does have the advertised BW. Stated 150 MHz; more like 200 MHz.
For many years now, we have been saying that risetime of modern scope is not exactly correlated with BW with any simple ratio.
BW is determined with frequency sweep. Risetime is separate parameter and is specified independently.
Your scope has specification of 450ps 10-90% typical. Typical means it can be a bit better or worse and still be in spec. Also keep in mind risetime will vary with sensitivity and signal amplitude. At different sensitivities different combinations of attenuators and amplifier stages are switched in, making subtle changes in front end response.
Similar Siglent SDS6104H12 shows 410-415ps 10-90% risetime. So a bit better but that is with 5GSa/s.
When 2.5GSa/s is forced it shows 420-430ps. Same signal source, of course.
I would say it is just fine.
Leo ships pulsers with certificate where you can see exact risetimes and pulse shape.
Each one is individually characterized. He does fantastic job and gives superb service.
It is amazing the amount of effort and care he puts in such a simple and inexpensive device.
I wish there were more people like him in the business...
And no, no relations, just a happy customer.