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Well that's what I thought, but my signal is DC. Won't then the cap just charge to whatever DC voltage - then I'll loose contact between the probe and the oscilloscope?
OK, so if I understand all of you right the filtering part should look like this:
Those "boxes" are chokes or coils, which I have to tune to written frequency.
Ok, thanks. Where do you mean to put the filter capacitor?
---------- Post added at 15:02 ---------- Previous post was at 15:00 ----------
Yep, the chokes I am refering to is a self resonant inductor.
OK. Thing is... the bnc connector connects to a resistor (1k or more, depends on the accuracy we need). The other side of the resistor is connected to a generator, generating low frequency ramp signal.
Then we measure DC voltage on both sides of the resistor - one is probe and the other is ramp...
No, the explanation is fine, thanks. So it is better to put chokes/notch LP filter just before the oscilloscope.
Should I equal the impedance at the end of the probe before connecting to the coax cable or can I just connect the probe to the cable without worrying about matching impedance...
Well plasma is a gas where molecules and atoms are stripped off of outer electrons, so it consists of ions, electrons and neutral particles (atoms and molecules). The probe itself measures ion and electron current, which we see as a probe characteristics. We sweep the probe with certain voltage...
Hey,
I am working with plasma and deal with measuring plasma particle densities. We use simple electric or Langmuir probes, which we put into plasma to measure the current picked up by the probe. The probe is then connected to the oscilloscope, where we measure current through voltage.
Plasma...
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