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MSO5000 Bode Plot Capability: Is it Good Enough? [Many tips about a 1st scope]

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Fungus:

--- Quote from: nctnico on October 05, 2022, 01:01:38 am ---
--- Quote from: tautech on October 04, 2022, 08:05:56 pm ---With the 2ch AWG and XY mode in the SDS1104X-E we can also have a play at curve tracing too:
https://www.eevblog.com/forum/testgear/fooln-around-with-dso-awg/

--- End quote ---
You can do curve tracing like this with any 2 channel function generator and oscilloscope.

--- End quote ---

Yep, and OP already owns a Uni-T signal generator.

egonotto:
Hello,

@2N3055: For a stability analysis it seems to me that you need an injection transformer. Unfortunately, I don't have that.
The problem with such measurements seems to me to be the small voltage. This could be remedied with a suitable preamplifier.

Best regards
egonotto

balnazzar:
Thanks, I searched for the string "SAG1021I" inside the datasheet, that's why I didn't find the damn specs...

balnazzar:
Ok, ordered both the 1104x-e and the AD2 (with bnc adapter).

I'll evaluate if I also need another goddamn signal generator (that right now I couldn't buy in any case...).

2N3055:

--- Quote from: Fungus on October 04, 2022, 02:18:19 pm ---
--- Quote from: 2N3055 on October 04, 2022, 02:04:41 pm ---
--- Quote from: balnazzar on October 04, 2022, 10:58:45 am ---So, if I stimulate the circuit with an external WG, the AD2 will bodeplot its response? Thanks.

--- End quote ---
No, Bode plot and impedance analysis works by controlling generator and scope in synchronization.  AD2 has internal AWG and uses that one...No support for external AWG.

--- End quote ---

Weird. My copy of the manual says the generator can be external. You might know that if you owned an AD2...

PS: Can your oscilloscope do this?


--- End quote ---

Thank you for contributing quality content!!
Is this external generator recent addition? I did look into documentation when I was contemplation buying one and don't remember that.. It was long ago though..

One drawback of Bode plot with external generator implemented this way is that you cannot control it in this tracking mode. That means that variable level stimulus is not available which is not strictly necessary in theory, but is very important with difficult loads and with very low signals to get good measurements.
Also it doesn't know exact frequency but has to measure it, but that is not important because frequency to mHz is not very important here.

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