| Products > Test Equipment |
| Functional comparison of R&S RTB2000, Siglent SDS2000X and Keysight DSOX1000 |
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| Performa01:
--- Quote from: RBBVNL9 on August 02, 2024, 06:58:48 pm ---I have now updated the series of comparison videos with an episode on math channels. Enjoy! --- End quote --- Thank you very much for this nice presentation! As always, a few remarks 😉 Of course does the SDS2000X Plus support track plots. I only have examples with the SDS824X HD handy, but you should be able to do this with the SDS2000X Plus just as well. It just cannot be found in the math menu, but at Measure - Tools – Track. This has the advantage that we can track all time-related functions, e.g. also rise time changes over time. https://www.eevblog.com/forum/testgear/sds800x-hd-review-demonstration-thread/msg5293765/#msg5293765 https://www.eevblog.com/forum/testgear/siglent-sds800x-hd-12-bit-dsos-coming/msg5436737/#msg5436737 https://www.eevblog.com/forum/testgear/siglent-sds800x-hd-12-bit-dsos-coming/msg5439530/#msg5439530 https://www.eevblog.com/forum/testgear/yet-another-which-oscilloscope-thread-(though-slightly-different-i-promise)/msg5346956/#msg5346956 As far as the never-ending discussion about the ERES/Average modes in the SDS2000X Plus, it’s been often stated (and I want to repeat it here) that there are some advantages in having them as math functions, mainly that you can turn it on for individual channels, combine them together and with other math functions and finally you don’t destroy the original data, which you could still compare and analyze in parallel. Acquisition modes on the other hand are never channel-specific; whenever you get something like that in the channel menu, then it certainly is some math function in disguise, destroying the original data for no good reason. The SDS2000X Plus is a very special device, as it is the only one of the new touch-screen generation, that has these limitations. All newer models have either four math channels and/or ERES/Average as both acquisition mode and math function. Higher class devices like SDS2000X HD and above (except SDS5000X) offer everything at once. Finally, the “divide by zero” debate. I was quite baffled to learn that you think there is something wrong with the solutions chosen by PicoScope and Siglent. In fact, there is not a single drawback to this. The R&S approach is almost the same, as PicoScope and Siglent have to do something similar; otherwise the application processor in the scope would throw an exception. The difference might just be the concrete number a vendor uses to substitute the zero value. This should take in consideration the possible resolution enhancement by certain acquisition modes and math functions, hence the smallest number that can be represented by the internal number format used for math would be a good start. We should never overdrive an input channel, because clipping can have a number of adverse effects. But there is no such limitation to the math channels. If a math result ranges from zero to a very high number (representing infinity) then it’s up to the user to chose a scaling factor that shows the region of interest best. I consider this even better than the scope trying to be smarter than its user and limit their choices. And you cannot argue with measurements; any function result that involves a division by zero just cannot yield a useful result. The correct approach in such cases is once again to define the zone of interest and do time-gated measurements there, carefully excluding the illegal part that contains one or more divisions by zero. |
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