DSPEC 50
®
and DSPEC 502
®
Digital Gamma-Ray Spectrometer User’s Manual
932502G / 0618
Figure 36. DSPEC 50 Amplifier PRO Tab.
Figure 37. DSPEC 50A Amplifier PRO Tab.
on this dialog and in the InSight mode to accommodate particular throughput/resolution
tradeoffs. The
Optimize
button also automatically adjusts the pole zero setting.
4.3. Amplifier PRO
This tab (Figs. 36 and 37 for the Standard and Advanced models respectively) contains the
controls for the
Low Frequency Rejector
(LFR) filter, high-frequency
Noise Rejection Level
,
Resolution Enhancer
, and
Enhanced Through-put Mode
. To enable a particular feature,
mark the corresponding checkbox. Any or all of these features can be used at one time,
however, the LFR and Enhanced Throughput modes must be set up before the Resolution
Enhancer is configured, as discussed below. Note that once an MCB is “trained” for the
Resolution Enhancer
(see the following section), it must be “retrained” if any settings
are changed that can affect peak shape or position (e.g., bias, gain, rise time, flattop, pole zero).
Low Frequency Rejector
— This feature is discussed in detail in Section 1.5. You
cannot
optimize or pole-zero the DSPEC 50 while in LFR mode. The
Optimize
feature must be
used with the LFR filter
off.
Subsequent measurements can then be taken with the LFR filter
on. Also, LFR mode affects the available range of protection times in
Enhanced Throughput
Mode
, as discussed in the next paragraph.
Noise Rejection Level
— This setting adjusts a filter that rejects high-frequency noise from
the ambient environment. It ranges from 0 to 4. The default setting,
2
; will be suitable for most
applications.
If the system is exhibiting high dead time with no source on the detector, the noise may be
induced by nearby RF interference or a result of a ground loop. If possible, resolve the source
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