Products > Test Equipment

recent experience shopping for hobby scope in today's market. tek, rigol, ...

<< < (6/10) > >>

David Hess:

--- Quote from: zrq on February 27, 2023, 03:38:16 pm ---I don't want to derail this thread further. I don't really understand, which feature is available on the TBS1000C but not SDS1000X-E ?
--- End quote ---

The TBS1000C has the equivalent of a dual delayed sweep which allows capture and magnification of the waveform *after* the trigger even when it is outside of its record length, which makes up somewhat for its lack of record length.  The other DSOs make up for this with long record lengths, but can only show the waveform within the limits of their record length.  This means that the short record length of the TBS1000C is not as much of a disadvantage as it otherwise would be.

So for instance the SDS1000X-E has a record length of 8 Msamples, which means at 1 GS/s it can display the wave at up to 3 milliseconds after the trigger.  The TBS1000C can do the same thing despite having only 20 Ksamples, and can go much beyond 3 milliseconds.

Both DSOs describe something called "trigger delay" in their documentation, but they are referring to very different things.  On the Tektronix (page 72), the trigger delay delays the acquisition like a delayed trigger or delayed sweep would.  On the Siglent (page 37), the trigger delay has nothing to do with a delay, and is simply the difference in time between the trigger point and what is shown on the screen.  On the Tektronix, this is called magnification.

This is another example of a Chinese oscilloscope company deliberately lying about a feature their DSO lacks.

tautech:

--- Quote from: David Hess on February 27, 2023, 07:07:17 pm ---
--- Quote from: zrq on February 27, 2023, 03:38:16 pm ---I don't want to derail this thread further. I don't really understand, which feature is available on the TBS1000C but not SDS1000X-E ?
--- End quote ---

The TBS1000C has the equivalent of a dual delayed sweep which allows capture and magnification of the waveform *after* the trigger even when it is outside of its record length, which makes up somewhat for its lack of record length.  The other DSOs make up for this with long record lengths, but can only do the same within the limits of their record length.

Basically this means that the short record length of the TBS1000C is not as much of a disadvantage as it otherwise would be.

--- End quote ---
Yet for the vast majority of work 14 Mpts SDS1000X-E has would swamp the capabilities of a similar Tek.

bdunham7:

--- Quote from: David Hess on February 27, 2023, 07:07:17 pm ---The TBS1000C has the equivalent of a dual delayed sweep which allows capture and magnification of the waveform *after* the trigger even when it is outside of its record length, which makes up somewhat for its lack of record length.  The other DSOs make up for this with long record lengths, but can only do the same within the limits of their record length.

--- End quote ---

I don't have the TBS1000C, but I have a similar-era Tek with a similar (one generation earlier?) ASIC and I'm not clear on the 'dual delayed sweep' statement.  Mine will do a fixed delay after trigger, but it doesn't display both the A and B sweep like earlier scopes, nor do I see how it could since it doesn't have the memory available to do so.  Is the TBS1000C like this or have they done something else?

David Hess:

--- Quote from: bdunham7 on February 27, 2023, 07:16:06 pm ---I don't have the TBS1000C, but I have a similar-era Tek with a similar (one generation earlier?) ASIC and I'm not clear on the 'dual delayed sweep' statement.  Mine will do a fixed delay after trigger, but it doesn't display both the A and B sweep like earlier scopes, nor do I see how it could since it doesn't have the memory available to do so.  Is the TBS1000C like this or have they done something else?
--- End quote ---

Not all dual delayed sweep oscilloscopes display both the A and B sweep simultaneously.  If they do, then it is referred to as "alternate dual delayed sweep", which was a later innovation that DSOs tended not to copy.

The TBS1000C operates exactly like a dual delayed sweep oscilloscope in runs-after mode.  So the first sweep starts after the trigger, there is an adjustable delay, and then the second sweep starts and acquires 20k sample points.  Both sweeps are completely independent like a dual sweep oscilloscope, but only one of them is displayed at a time.  On the TBS1000C, it means that a 1 GS/s aquisition can be make way after the trigger point beyond the point where these other DSOs could do it.

David Hess:

--- Quote from: tautech on February 27, 2023, 07:13:32 pm ---Yet for the vast majority of work 14 Mpts SDS1000X-E has would swamp the capabilities of a similar Tek.
--- End quote ---

Unless you wanted to capture and display a 1 GS/s acquisition beyond 6 milliseconds, and the TBS1000C is still has modern features despite its short record length.

Navigation

[0] Message Index

[#] Next page

[*] Previous page

There was an error while thanking
Thanking...
Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod