While performing measurements , using a solartron based Impedance analyzer (with range 36 micro Hz-36 MHz), i am facing the same repetitive pattern of noise/oscillations during frequency sweep from 1 MHz to 0.1 Hz, even at 0V DC.
Noises are being observed in specially 3 regions of frequency, as shown in attached figure.
1) First one is above 1 MHz
2) At or just below 100KHz
3) Below 100Hz (Exactly at 50MHz) & heavily random noises towards 1 Hz.
The above 3 Noise /oscillations are dominating/ growing with increasing Dc voltage.
At 50Hz (as shown in 2nd figure) , it is expected to be the interference of outside Ac noise of 50 Hz( as we are not using Faraday cage) but what about the other frequency ranges ? Is it due to the aforesaid reason and will be solved by using metal faraday cage during impedance measurement or anything else are the culprits?
Here,for reference, i am attaching 2 figures of measurements, Please let me know the possible reason and their remedies for smooth Impedance data.
Ideal arrangement, use as much averaging or integration as possible. Operate the DUT on battery if an active device. If you are not in a screen room or a Faraday cage, making noise measurements is tough at best! That said, you can make a Faraday cage large enough to house the DUT and the measurement instrument using copper screen and a wooden box frame. Try running the test instrument on an isolation transformer. If you suspect low frequency noise degradation is a bigger issue, try obtaining mu metal as used in shielding CRT's. Make a mu metal shield for the DUT. Even steel chassis with some iron alloy added will assist.
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