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Siglent SDS1x04X-E BodePlot II (SFRA) features and testings

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mrprecision:
I have tried out to measure the impedance vs. frequency. I was surprised how good this worked out. After the first tries I have build a connection box for better results. I have measured than a 1uF Wima capacitor. This turned out very good and I have compared it with the results of a Rode&Schwarz network analyzer. For privat use the results are very good up to 20MHz. If I set the probes correct than the y-axis scaling is also correct in dB. You only have to calculate Z=10^(dBvalue/20) and you get the value in ohms. Someone tried this also out?

See the results:

khutch004:

--- Quote from: n3mmr on January 05, 2020, 07:53:18 am ---
--- Quote from: tautech on January 05, 2020, 07:17:07 am ---
--- Quote from: Pitrsek on January 05, 2020, 01:46:54 am ---Any clue as to why is the low limit set to 10Hz?

--- End quote ---
Offer a valid use case for under 10 Hz and we'll send this request to Siglent.

--- End quote ---

For really-high-quality audio power amplifiers, a bode plot of the range 0.1 Hz to, say, 100 Hz will enable a designer to accurately predict the audibility of artefacts coming from attempts to limit the vlf range by steep slope high pass filtering of subsonics.

--- End quote ---

People building bass guitar amps and high pass filters for them are interested in evaluating the very low frequency response. They often use an HPF to prevent the cone excursions from exceeding safe limits if subsonic information appears at the amplifier inputs. Bass cabs often walk a fine line between being able to generate a high output level at 30 to 60 Hz and blowing up when presented with low frequency noise and often some help from the amp or a filter in front of the amp is needed.

A better question to ask is the 10Hz low limit arbitrary or is it driven some important cost or reliability concern?

If it was just an arbitrary limit then why NOT extend it as far as possible?

People building filters for some scientific applications will want to test at sub 10Hz frequencies. There may not be terribly many such people but again if the limit is arbitrary then it should be removed.

mrprecision:

--- Quote ---I have tried out to measure the impedance vs. frequency. I was surprised how good this worked out. After the first tries I have build a connection box for better results. I have measured than a 1uF Wima capacitor. This turned out very good and I have compared it with the results of a Rode&Schwarz network analyzer. For privat use the results are very good up to 20MHz. If I set the probes correct than the y-axis scaling is also correct in dB. You only have to calculate Z=10^(dBvalue/20) and you get the value in ohms. Someone tried this also out?
--- End quote ---

Because some users asked me, here are pictures of my connection boy for the impedance measurement with the Bode Plot II function. Has anyone tried to measure the impedance vs. frequency with the Bode Plot II function?







rf-loop:
Nice work.

---
About new SDS2000X Plus Bode Plot.
SDS2kX+ have 50MHz internal signal generator. Of course with it can not do setups what use SDG with 2 output settings.

I have not SDS2000X Plus and here in China all who knows are now spring holidays.

Who can check if this model can use internal signal generatorfor BP use only without FG license installed. Even with scopes with external SAG USB generator do not need SAG  license if use this only for BodePlot.
If use SDS2kX+ internal signal gen only for BP (BP controls it automatically) do it work without FG licence.

mrprecision:

--- Quote ---About new SDS2000X Plus Bode Plot.
SDS2kX+ have 50MHz internal signal generator. Of course with it can not do setups what use SDG with 2 output settings.

I have not SDS2000X Plus and here in China all who knows are now spring holidays.

Who can check if this model can use internal signal generatorfor BP use only without FG license installed. Even with scopes with external SAG USB generator do not need SAG  license if use this only for BodePlot.
If use SDS2kX+ internal signal gen only for BP (BP controls it automatically) do it work without FG licence.
--- End quote ---

I use the Scope SDS1104X-E and the generator SDG2122X and I don't need any licence for the BodePlot and FunktionGenerator. I connect them over ethernet.

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