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Navigation to
sections:
The Microanalysis System
What makes a Good Detector?
The Pulse Processor
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section
Role of the pulse processor
Analog pulse shaping
Time variant shaping
Digital pulse shaping
Fixed process time
Adaptive pulse shaping
Resolution & count rate
Pulse pile-up protection
Comparing different pulse processors
Summary
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The pulse
processor
Does
resolution change with count rate?
Even when using a fixed process
time resolution may change with count rate when using analog or digital
shaping. For example, this may be due to changes in the slope of the ramp
caused by variable leakage current, or where the contribution of
after-effects of ramp restore increases with restore rate. Furthermore,
instabilities in the detector and variations in electronic baseline may be
accentuated by increasing count rate. Although most systems should be able
to maintain resolution sufficiently for X-ray mapping, only the best designs
will achieve stability (within 1%) required for accurate peak deconvolution.
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