Electronics > Projects, Designs, and Technical Stuff
Mystery scientific preamplifier - Reverse engineering
Kleinstein:
I don't think a BNC T and (50Ohms) termination at the PMT is not the right way. If planed to go that way with 50Ohms at the output, the resistor should be inside the case. The TIA might have some termination - 50 Ohm input impedance would not be that unusual for a TIA and if needed one could add a few 10 Ohms in series.
It still depends on the needed speed. Just spectroscopy does not need super sharp peaks and high BW and thus no termination.
For the optics it is nice of the peak forming does not include an undershoot. The peak high measurement usually does not make use of the negative part. So this part is kind of unused and would thus be lost energy / information. However the simple methods should not give a large error from the undershoot - more like a tiny bit more noise.
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