The pole zero adjustment matches the differentiator circuit
to the fall time of the preamplifier pulse. The adjustment is usually done
on an oscilloscope to examine the tail of the pulse on an expanded voltage
scale (~20mV / division).
- Using a radioactive source, placed near the detector so as to
produce a few thousand counts per second.
- An observation of the unipolar output is made to check for a tailing
edge.
 Adjust the pole zero screw control
(PZ) so that the tailing edge returns
to the baseline with no undershoot or overshoot.
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