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Capacitive & Inductive Impedance Plots with SDS2104X Plus Bode Function

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Martin72:
Hi,


--- Quote ---Edit: Added (Calculated from graphs and Tonghui LCR Meter TH2830 Measured values).

#28 680uF Electrolytic     (634uf, 641.5uF @ 100Hz)
--- End quote ---

Pic #28 the marker is on -52dB/100hz.
Tried your "formulars" in the first posts...Hmmm...won´t come to the calculated 634µF, I must do something wrong.

mawyatt:

--- Quote from: Martin72 on August 07, 2022, 09:07:04 pm ---Hi,


--- Quote ---Edit: Added (Calculated from graphs and Tonghui LCR Meter TH2830 Measured values).

#28 680uF Electrolytic     (634uf, 641.5uF @ 100Hz)
--- End quote ---

Pic #28 the marker is on -52dB/100hz.
Tried your "formulars" in the first posts...Hmmm...won´t come to the calculated 634µF, I must do something wrong.

--- End quote ---

Here's the formulas from above.

First calculate Z as:

|Z| ~ R[ 10^(dB/20)]

Which equals 2.5119 ohms at -52dB reading at 100Hz with R = 1000

Then calculate C (this assumes the the imaginary part of Z ~ |Z|).

C ~ 1/(|Z|*2pi*F)

Which equals 633.61uF at 100Hz.

Best,

Martin72:
Ah, now I got it :-+

tautech:

--- Quote from: mawyatt on August 03, 2022, 04:28:53 pm ---A VNA is certainly a good instrument to use but has some limitations with these type components.

First, it's frequency range doesn't extend down to areas where many of the capacitors mentioned are typically measured & used, and secondly it's design is centered around 50 ohms typical of RF usage.

--- End quote ---
The weather was conducive to time in the lab today to conjure up a fitment for the VNA similar to the very simple one Chris Grossman used, just some SMA fittings, veroboard and SIL turned pin sockets.

The SVA1000X range in VNA mode is restricted to minimum frequencies of 100 KHz which certainly limits its usefulness however the new SNA5000A models can start down at 9 KHz but nowhere near the few Hz the scope Bode plot feature can so it's far superior for the lower cap frequencies.

Even the 0.1uF played with weren't very exciting and green cap and MLCC measured similar values.
Off now to find some other types for a session of education.  :)

mawyatt:
Here's plots of a 2.2mH (#61), 470uH (#62), 1mH (#63), 100uH (#65), 10uH (#66) and another type 100uH (#67) inductor we had in stock. These plots were using a 100 ohm sense R, and a Differential Amp (DP10007) for Ch1.

They show the Magnitude and Phase response and SRF of the various inductors.

Best

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