Products > Test Equipment
Functional comparison of R&S RTB2000, Siglent SDS2000X and Keysight DSOX1000
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bdunham7:

--- Quote from: tautech on January 09, 2022, 07:50:18 am ---I suggest you get a 10k pot out and find the 100x sense pin thresholds for your 2kX+ as it appears they don't match Tek but is that any surprise ?
Since forever there has been no hard and fast standard for sense pin resistances.

--- End quote ---

I tried it with two probes, one ~5k and one ~6.9k, so I've sort of bracketed the nominal 6k spec, if that's correct.  I assume any reasonable setup would allow for some variance.  So I'm sort of suspecting that the SDS2kX+ is an all-or-nothing 1x/10x only setup.  I'll try the potentiometer if I get a chance.  b/t/w, having faulty or poorly implemented probe sensing is worse than none at all as it appears you can't override it.  I'll have to come up with some insulating washers.


--- Quote ---FYI this is how the same probe autosenses in 50 Ohm mode.

--- End quote ---

I don't think input impedance should matter to probe sensing?
nctnico:

--- Quote from: tautech on January 09, 2022, 06:08:29 am ---
--- Quote from: bdunham7 on January 09, 2022, 03:29:19 am ---
--- Quote from: tautech on January 09, 2022, 02:26:26 am ---What is the pin to BNC outer resistance ? This 100x probe measures 6.2k and autosenses just fine.
Don't have a SDS2kX+ unboxed so checked on my SDS5kX demo.

--- End quote ---

I have a Tek P6156 with switchable 1x/10x/20x/100x. 

--- End quote ---
Seems entirely the wrong probe to use with a SDS2kX+.

https://w140.com/tekwiki/wiki/P6156
It is designed for use with wide band oscilloscope amplifiers with 50 Ω inputs

--- End quote ---
Not at all. The information on that page is simply wrong. The Tektronix P6156 is a general purpose Low-Z (passive) probe which is supported on many Tektronixs DSOs including the TDS500/600/700 series. I have a couple of these as well but it sucks to have the autosense pin isolated because non-Tektronix scopes interpret the resistance wrong.
RBBVNL9:
Concerning having (button) LEDs on for all active channels (vs. selected channels): I realize from the comments this is a bit of a user preference aspect and also may depend on the devices you come from, respectively the other devices you use.

2N3055 makes an important point that we should not forget about people with visual impairment. They may indeed prefer to have button lights illuminating on selected channels only. I must note, however, that the RTB and DSOX both can show the text “Channel 3” written on the screen when channel 3 is edited, and both also show it with trace markers (left of the trace). The RTB furthermore shows it with a highlight at the bottom of the screen. So, there are multiple clues for the (colour) visually impaired onj these devices.


--- Quote ---Not recognizing why Siglent have laid out the channel button indicators how they have seems like the user has recently migrated to a DSO after years of experience with only CRO's.
--- End quote ---

I don’t think that is a fair point, tautech: having lights on the front panel illuminated for all active channels does not seem to be uncommon for modern DSOs at all. Unless I am mistaken, this is the implementation on various models of Teledyne LeCroy (WavePro HD, WaveRunner 8000HD, HDO6000B, WaveSurfer 4000HD), Tektronix models (3 series, 4 series, 5 series), R&S (RTM3000, RTA4000, RTE1000, RTO2000 and RTP RTP), and Keysight (2000X, 3000X, 4000X), to name a few. Most of these examples have shared vertical controls.

Looking at various manufacturers, I even asked myself whether any brand other than Siglent on recent models made the choice to illuminate the buttons for selected channels only. But I am sure others can fill in the gap and show who did, and who did not.

In any case, it’s a matter of user preference; will change this in the document.
2N3055:

--- Quote from: RBBVNL9 on January 09, 2022, 07:42:03 pm ---Concerning having (button) LEDs on for all active channels (vs. selected channels): I realize from the comments this is a bit of a user preference aspect and also may depend on the devices you come from, respectively the other devices you use.

2N3055 makes an important point that we should not forget about people with visual impairment. They may indeed prefer to have button lights illuminating on selected channels only. I must note, however, that the RTB and DSOX both can show the text “Channel 3” written on the screen when channel 3 is edited, and both also show it with trace markers (left of the trace). The RTB furthermore shows it with a highlight at the bottom of the screen. So, there are multiple clues for the (colour) visually impaired onj these devices.


--- Quote ---Not recognizing why Siglent have laid out the channel button indicators how they have seems like the user has recently migrated to a DSO after years of experience with only CRO's.
--- End quote ---

I don’t think that is a fair point, tautech: having lights on the front panel illuminated for all active channels does not seem to be uncommon for modern DSOs at all. Unless I am mistaken, this is the implementation on various models of Teledyne LeCroy (WavePro HD, WaveRunner 8000HD, HDO6000B, WaveSurfer 4000HD), Tektronix models (3 series, 4 series, 5 series), R&S (RTM3000, RTA4000, RTE1000, RTO2000 and RTP RTP), and Keysight (2000X, 3000X, 4000X), to name a few. Most of these examples have shared vertical controls.

Looking at various manufacturers, I even asked myself whether any brand other than Siglent on recent models made the choice to illuminate the buttons for selected channels only. But I am sure others can fill in the gap and show who did, and who did not.

In any case, it’s a matter of user preference; will change this in the document.

--- End quote ---

Some scopes might have it like this but it is wrong and is remnant of old, and makes sense only for scopes that have individual controls for each channel.
Like I said my MSOX3000T does that, BUT for MATH, FFT, Digital and REF uses same logic as Siglent because those functions share same two controls.

Lecroys absolutely work same as Siglent, i.e. buttons light up only for currently selected channel. Entry level LeCroys are made by Siglent and have to have similar U/I logic..
EDIT: it seems I'm wrong and that current LeCroy models do light up buttons for enabled channels. I disagree with that choice either.

Tek and R&S do this but I don't understand why. Highlights are not that obvious. My eyesight is not what it used to be and I can clearly see if that 2x2 cm square on the screen is there or not on Siglent. On R&S it difference ifs font background is a bit more highlighted. I have to look for that.

It is not something useful and it is not color disability friendly. Hard fail in my eyes.
Martin72:
Hi,

Very interesting comparison, but...

The Rigol MSO5000 is hardly missed in there.

Yes, the question should I buy a SDS2k+ or RTB came several times up - But also should I buy a MSO5000 or SDS2k+.
And very rare or no times a DSOX1000 or RTB/SDS2K+/MSO50000.
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