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Siglent SDS1104X-E anomaly on what should be a simple task.

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mawyatt:

--- Quote from: 2N3055 on November 06, 2022, 04:17:39 pm ---
Vertical offset works to nullify large DC from signal that has large DC with some AC on top. In which case you subtract DC part and amplifier gets only the rest. You could do that with AC coupling, but DC coupling with offset retains absolute voltage values for correct measurements.
Different scopes have different DC offset ranges. One thing I like about SDS2000X HD is extended offset in comparison to other scopes in class.. Useful for work on power circuits, well complemented with 12 bit, low noise and analysis package..

--- End quote ---

Exactly!! The DC Offset is very beneficial when one doesn't want the low corner of the AC coupling to alter the signal of interest. The SDS2000X+ also has a nice wide DC Offset range that is stable and doesn't add noise!!

Does the HD version have a wider DC Offset range than the X+ ?

Best,

2N3055:

--- Quote from: mawyatt on November 06, 2022, 04:27:51 pm ---
--- Quote from: 2N3055 on November 06, 2022, 04:17:39 pm ---
Vertical offset works to nullify large DC from signal that has large DC with some AC on top. In which case you subtract DC part and amplifier gets only the rest. You could do that with AC coupling, but DC coupling with offset retains absolute voltage values for correct measurements.
Different scopes have different DC offset ranges. One thing I like about SDS2000X HD is extended offset in comparison to other scopes in class.. Useful for work on power circuits, well complemented with 12 bit, low noise and analysis package..

--- End quote ---

Exactly!! The DC Offset is very beneficial when one doesn't want the low corner of the AC coupling to alter the signal of interest. The SDS2000X+ also has a nice wide DC Offset range that is stable and doesn't add noise!!

Does the HD version have a wider DC Offset range than the X+ ?

Best,

--- End quote ---

Hi Mike,

it does, quite more:
------------------------------------------
SDS2000X+ :

Offset range (probe 1X)
500 μV/div ~ 100 mV/div: ± 2 V
102 mV/div ~ 1 V/div: ± 20 V
1.02 V/div ~ 10 V/div: ± 200 V
------------------------------------------
SDS2000X HD
Offset range (probe 1X)

1 MΩ:
0.5 mV/div ~ 5 mV/div: ±1.6 V;
5.1 mV/div ~ 10 mV/div: ±4 V;
10.2 mV/div ~ 20 mV/div:±8 V;
20.5 mV/div ~ 100 mV/div: ±16 V;
102 mV/div ~ 200 mV/div: ±80 V;
205 mV/div ~ 1 V/div: ±160 V;
1.02 V/div ~ 10 V/div: ±400 V

50 Ω:
0.5 mV/div ~ 5 mV/div: ±1.6V;
5.1 mV/div ~ 10 mV/div: ±4 V;
10.2 mV/div ~ 20 mV/div:±8 V;
20.5 mV/div ~ 1 V/div: ±10 V

Take care!

mawyatt:

--- Quote from: 2N3055 on November 06, 2022, 04:52:51 pm ---
Hi Mike,

it does, quite more:
------------------------------------------
SDS2000X+ :

Offset range (probe 1X)
500 μV/div ~ 100 mV/div: ± 2 V
102 mV/div ~ 1 V/div: ± 20 V
1.02 V/div ~ 10 V/div: ± 200 V
------------------------------------------
SDS2000X HD
Offset range (probe 1X)

1 MΩ:
0.5 mV/div ~ 5 mV/div: ±1.6 V;
5.1 mV/div ~ 10 mV/div: ±4 V;
10.2 mV/div ~ 20 mV/div:±8 V;
20.5 mV/div ~ 100 mV/div: ±16 V;
102 mV/div ~ 200 mV/div: ±80 V;
205 mV/div ~ 1 V/div: ±160 V;
1.02 V/div ~ 10 V/div: ±400 V

50 Ω:
0.5 mV/div ~ 5 mV/div: ±1.6V;
5.1 mV/div ~ 10 mV/div: ±4 V;
10.2 mV/div ~ 20 mV/div:±8 V;
20.5 mV/div ~ 1 V/div: ±10 V

Take care!

--- End quote ---

I thought the SDS2000X+ had a very good DC Offset range, the HD version is indeed outstanding :-+

Thanks for the quick reply, and the usual quality information  :clap:

Best,

py-bb:

--- Quote from: bdunham7 on November 06, 2022, 05:43:36 am ---
--- Quote from: py-bb on November 05, 2022, 12:42:08 pm ---Or was yours somehow defective? The probes perhaps?

--- End quote ---

It wasn't defective, it simply has a characteristic of having much, much slower overdrive recovery than the other scopes I compared it to.  It has been stated by others that this is simply the nature of modern DSO input amplifiers, but I haven't taken the time to compare any others nor do I actually have access to many to try.  AFAIK nobody has tried my fairly simple signal test on any fancier scopes.  It is possible that older designs may not have this issue even in cheapo scopes, but I don't know. 

Yes, keeping the signal on the screen fixes the issue, or at least almost does (there was a thread about this same scope showing a small dip on a very slow square wave and I think that is probably also related to the damping of the input amplifier somehow) but keeping it on the screen also reduces the resolution of your view of the signal that you actually want to see.

--- End quote ---

SOrry for the late reply, can you link me the tests you want to run? I can give them a go if I have the equipment.


One issue I've found with the DSO scopes around me (whether it generalises I can't say) is that if you use a voltage offset they get bad.

I am 99.9% sure that internally the ones around me amplify/attenuate/buffer the input so it is in the range -1v to +1v for the scale on the settings.

When I apply an offset and get above 70% of the range I can offset the edge of a square wave becomes really curved, it doesn't undershoot, it's just much slower - I'll take some screenshots later if it'll help.

What I'll try doing is adding a DC offset to a square wave that is in range and see if it persists.

tautech:

--- Quote from: py-bb on December 27, 2022, 04:27:06 am ---
One issue I've found with the DSO scopes around me (whether it generalises I can't say) is that if you use a voltage offset they get bad.

--- End quote ---
See Offset Range (Probe 1X) P8 in Datasheet:
https://int.siglent.com/u_file/document/SDS1000X-E_DataSheet_EN04D.pdf

Yep show us some screenshots.

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