digiBASE-E ™ High-Performance Power-over-Ethernet Multichannel Analyzer / PMT Base for Scintillation Detectors
28
Throughput Maximum throughput with the appropriate scintillator is 196k cps with a
532k cps input rate. Note that peaking time (Rise Time + Flattop) should not be less than ~4×
the light collection time of the scintillator; i.e. NaI should not be less than about ~1
μ
s.
List Mode Acquisition Each valid event is converted to a digital value and transmitted to the
computer along with a time stamp accurate to 160 ns. See Appendix B.
Histogram Mode Acquisition data are histogrammed within the digiBASE-E. Data channels
are 31 bits. Most significant bit is ROI bit.
Spectrum Transfer Transfer of any single spectrum takes
#
15 ms. This transfer is independent
of the acquisition and does not create dead time for the acquisition of additional data.
4.2. Inputs
A-IN SMA input connector accepts LVTTL signals (+3.3 V) that function depending the Gate
setting on the ADC tab under Acquire/MCB Properties... in MAESTRO; see Section 2.2. Input
impedance is 1 k
Ω
to +3.3 V, protected to ±5 V.
B-OUT A second SMA connector with nominal 100-
Ω
output Z provides a bridged output for
the signal provided to the A-IN input. This output provides the SyncMaster signal if this
digiBASE-E is designated the SyncMaster unit as discussed in see Section 2.2.
LAN PoE RJ45 (8P8C) jack accepts Power-over-Ethernet (PoE) from the accompanying
single-port injector or any other IEEE 802.3af switch.
4.3. Use with Lanthanum Chloride and Lanthanum
Bromide Detectors
The latest lanthanum halide detectors are appearing with 12-pin PMTs for the smaller size
(1 in. × 1 in.) crystals on 1.5 in. PMTs, and 8-stage (as opposed to 10-stage), 14-pin bases on
2 in. and 3 in. PMTs for the larger crystal sizes. If required, compatibility can be achieved
through the use of adaptors. Contact ORTEC or your detector vendor for more information.
4.4. Computer Controls and Indicators
All controls and readouts are implemented in the MAESTRO MCA Emulation Software
included with the digiBASE-E. For more complex applications, the digiBASE-E is completely
compatible with our ScintiVision
™
-32 MCA Emulation and Analysis Software for Scintillation
Summary of Contents for digiBASE-E
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