932502G / 0618 67. SPECIFICATIONS
Maximum System Throughput >100,000 cps with LFR off, >34,000 cps with LFR on;
depends on shaping parameters.
Pulse Pileup Rejector Automatically set threshold. Pulse-pair resolution typically 500 ns. (See
the discussion of the Noise Rejection Level control on page 46.)
Automatic Digital Pole Zero Adjustment Can be set automatically or manually. Remote
diagnostics via Insight Virtual Oscilloscope mode in MAESTRO.
Digital Gated Baseline Restorer Software-controlled adjustment of the restorer rate (Fast,
Slow, and Auto).
LLD Digital lower-level discriminator set in channels. Hard cutoff of data in channels below
the LLD setting.
ULD Digital upper-level discriminator set in channels. Hard cutoff of data in channels above
the ULD setting.
Ratemeter Monitor the input count rate on the DSPEC 50 display or computer screen.
Battery Internal battery-backed up memory to maintain settings in the event of a power
interruption.
Presets Multiple presets can be set on any or all of the following:
! Real Time Stops data collection when the real time reaches this value.
! Live Time Stops data collection when the live time reaches this value.
! ROI Integral Integral count stops data collection when the sum of counts in all ROI
channels reaches this value.
! ROI Peak Peak count stops data acquisition when the count in any ROI channel reaches
this value (maximum value of 2
31
!1 counts [2×10
9
]).
! Uncertainty Sets the required statistical accuracy on a key peak (for example: stop
counting when the activity of
60
Co is known to be better than 5%).
! Multi-Nuclide MDA Stops data collection when the value of the minimum detectable
activity (MDA) for up to 20 user-specified MDA nuclides reaches the preset value. The
presets are implemented in hardware so the computer does not have to poll the
DSPEC 50. See Section 4.10, 4.12, 5.1, 5.2 for details on the MDA preset calculation.
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