ORTEC DSPEC Pro, Hardware User Manual

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For the legacy LO-AX and IGLET-X detector types, the respective energy ranges are 94 keV–6 MeV and
8 keV–500 keV.
45
3. SPECIFICATIONS
3.1. DSPEC Pro
Display 240 × 160 pixel, backlit LCD provides status information, instrument ID, bias infor-
mation, live and real time.
Maximum System Throughput >100,000 cps; depends on shaping parameters.
Enhanced Throughput Mode Protection time from 0.1
µ
s to 200
µ
s in 25 ns increments.
LFR Mode Highest Throughput
(minimum Protection Time)
Lowest Throughput
(maximum Protection Time)
Off (Rise Time + flattop) (2 × Rise Time + Flattop)
On (3 × Rise Time + 2 × Flattop) (6 × Rise Time + 3 × Flattop)
System Gain Settings
!
Coarse Gain Settings 1 to 32 in binary steps (1, 2, 4, 8, 16, 32).
!
Fine Gain 0.45 to 1.
The available range of gain settings supports all types of HPGe detectors. Specifically the fol-
lowing maximum energy values are achievable using the standard ORTEC preamplifier (maxi-
mum to minimum gain):
12
!
COAX 187 keV–12 MeV
!
GLP/SLP 16.5 keV–1 MeV
Amplifier Input Polarity Selectable via software.
System Conversion Gain Software selectable as 16384, 8192, 4096, 2048, 1024, or 512
channels.
Preamplifier Software selectable as either resistive or TRP preamplifier.
ADC Gate (Not available for -PLUS [transistor-reset preamplifier] or SMART-1 detectors.)
Accepts a positive TTL input via the DIM’s “Inhibit” BNC. Signal must occur prior to and
extend 0.5
µ
s beyond peak detect. Software-selectable as off, coincidence, or anticoincidence.