3. HPGe detectors and Si Systems with Optical Feedback Preamps.
For normal Si Systems, the pole/zero is usually set at ∞ fully
counterclockwise. However, on some systems, the pole/zero may need to be
slightly tweaked for optimum overload recovery when responding to the
preamps reset pulse.
Note 1: At high Count rates the pole. zero adjustment is extremely critical for main
-
taining good resolution and low peak shift. For precise and optimum
pole/zero setting, a scope vertical sensitivity of 50 mV cm should be used.
11
Spectroscopy System Operation
Figure 9 Correct Pole/Zero Compensation
Figure 10 Undercompensation Pole/Zero
Figure 11 Overcompensation Pole/Zero
Scope
Vertical: 50 mV/cm
Horizontal: 0.2 µs/cm
Source
Square wave pulse and preamp
test input.
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