Products > Test Equipment
2 GHz scope: Rigol MSO8000 vs Siglent SDS6000
Barleyman:
Unless they're barefaced being dishonest about it, that's exactly what both Rigol and Siglent claim. 1.6pF and low-z 500R for Rigol RP6150A, Siglent RP6150A (note the names..) claims 1.8pF and 500R and gives you a lot more performance data. Presuming they're the same probe except for the spiffy connector for Rigol, Siglent's data probably matches fairly well for Rigol as well.
Rigol:
https://int.rigol.com/Images/RP6150AUserGuideCNEN_tcm7-3146.pdf
Siglent:
https://siglentna.com/product/sp6150a-1-5-ghz-oscilloscope-probe/
There's discussion about Siglent's version here:
https://www.eevblog.com/forum/testgear/new-siglent-sp6150a-passive-1-5-ghz/
AndyC_772:
1.6pF is impressively low, but it's still 66 Ohms at 1.5 GHz.
IMHO any scope 500 MHz or above really needs active probes. It's pointless not to have them because the load from any passive probe dramatically distorts the signal being probed.
It's a significant issue with even lower bandwidth. I have on my desk a shiny new Siglent SDS3034XHD, rated 350 MHz. The probes that came with it say 10pF, which at 350 MHz is just 45 Ohms. (But it could be worse - the probes that came with my Agilent MSOX3104X are 11pF!)
Barleyman:
Depends on what you're trying to do. For debugging 480Mbit USB it should be fine as long as you figure out the voltage division happening. The base 500MHz probe might be better for that purpose, but I've not tested it.. Anyways, imperfect tool usually beats no tool and justifying purchase of a 1GHz differential probe would be uphill battle since vast majority of the work is low frequency analogue, with some interest in seeing potential ringing happening in fast edges like this or power circuits.
Now buying a high voltage differential probe is perfectly justified as I need to see mains vs triac. But those peter out at around 200MHz
tautech:
--- Quote from: Barleyman on December 12, 2024, 07:01:53 pm ---Unless they're barefaced being dishonest about it, that's exactly what both Rigol and Siglent claim. 1.6pF and low-z 500R for Rigol RP6150A, Siglent RP6150A (note the names..) claims 1.8pF and 500R and gives you a lot more performance data. Presuming they're the same probe except for the spiffy connector for Rigol, Siglent's data probably matches fairly well for Rigol as well.
Rigol:
https://int.rigol.com/Images/RP6150AUserGuideCNEN_tcm7-3146.pdf
Siglent:
https://siglentna.com/product/sp6150a-1-5-ghz-oscilloscope-probe/
There's discussion about Siglent's version here:
https://www.eevblog.com/forum/testgear/new-siglent-sp6150a-passive-1-5-ghz/
--- End quote ---
I have SP6150A here to pair with SDS6204A but not tested it in detail yet.
Also SAP1000 active probe and various signal sources including a nice Leo Bodnar 30ps pulser.
Gets interesting examining probing effects ......endorsing the fact that taking any measurement itself effects the measurement.
We had a nice little thread on this matter..... a couple of posts:
https://www.eevblog.com/forum/testgear/probe-into-probes-whats-up/msg4678768/#msg4678768
https://www.eevblog.com/forum/testgear/probe-into-probes-whats-up/msg4684580/#msg4684580
Barleyman:
--- Quote from: tautech on December 13, 2024, 01:51:10 pm ---
--- Quote from: Barleyman on December 12, 2024, 07:01:53 pm ---Unless they're barefaced being dishonest about it, that's exactly what both Rigol and Siglent claim. 1.6pF and low-z 500R for Rigol RP6150A, Siglent RP6150A (note the names..) claims 1.8pF and 500R and gives you a lot more performance data. Presuming they're the same probe except for the spiffy connector for Rigol, Siglent's data probably matches fairly well for Rigol as well.
Rigol:
https://int.rigol.com/Images/RP6150AUserGuideCNEN_tcm7-3146.pdf
Siglent:
https://siglentna.com/product/sp6150a-1-5-ghz-oscilloscope-probe/
There's discussion about Siglent's version here:
https://www.eevblog.com/forum/testgear/new-siglent-sp6150a-passive-1-5-ghz/
--- End quote ---
I have SP6150A here to pair with SDS6204A but not tested it in detail yet.
Also SAP1000 active probe and various signal sources including a nice Leo Bodnar 30ps pulser.
Gets interesting examining probing effects ......endorsing the fact that taking any measurement itself effects the measurement.
We had a nice little thread on this matter..... a couple of posts:
https://www.eevblog.com/forum/testgear/probe-into-probes-whats-up/msg4678768/#msg4678768
https://www.eevblog.com/forum/testgear/probe-into-probes-whats-up/msg4684580/#msg4684580
--- End quote ---
How do you do the HF compensation exactly? I can see from your images that the uncalibrated 500MHz probe is what it is but after calibration it's radically improved. I mean, cheap old probes have this screw you can tweak with a plastic bit to improve them a bit but somehow, I do doubt that's what's going on here. Is this a Siglent scope software feature?
Also WRT to the standard issue 500MHz probe you tested there, these low-z probes are rather different beasts, I'm not quite sure what to expect. USB HS line has theoretical 45R single ended impedance (but let's be realistic here) so feeding that to a ~150R+50R load (at 500MHz) would already drop the voltage by ~20% and at the leading edge it'd be much more significant. Very similar as your uncompensated image shows.
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