17
Subject to change without notice.
18
Ron Jenkins, R. W. Gould, and Dale Gedcke, Quantitative X-Ray Spectrometry (New York: Marcel Dekker,
Inc.), 1981, pp. 266–267.
19
Patent pending.
91
9. SPECIFICATIONS
17
System Conversion Gain The Detective-EX/DX operates at a conversion gain of 8192
channels.
Shaping-Time Constants
! Rise time: 3.4 µs, fixed.
! Flattop: 0.8 µs width, fixed.
Dead-Time Correction Extended live-time correction according to Gedcke-Hale method.
18
Accuracy: area of reference peak changes <±3% from 0 to 50000 cps.
Linearity
! Integral Nonlinearity: <±0.025% over top 99.5% of spectrum, measured with a mixed
source (
55
Fe at 5.9 keV to
88
Y at 1836 keV).
! Differential Nonlinearity: <±1% (measured with a BNC pulser and ramp generator).
Overload Recovery At maximum gain, recovers to within 2% of rated output from ×1000
overload in 2.5 non-overloaded pulse widths (measured using our InSight™ Virtual
Oscilloscope).
Pulse Pileup Rejector Automatically set threshold. Pulse-pair resolution typically 500 ns.
Stored-Spectrum Memory An unlimited number of spectra can be stored on removable
SecureDigital or CompactFlash memory cards. The number of spectra stored on an individual
card depends on the capacity of the card.
Low Frequency Rejector (LFR) Filter
19
The digital signal processor incorporates ORTEC’s
exclusive LFR filter, designed to reduce microphonic and low-frequency periodic noise (if
present) from germanium detector output signals, thereby producing significant improvement in
spectral resolution. The LFR is specifically beneficial in systems cooled by mechanical coolers,
which are known to often contribute microphonic noise to the spectrum (thereby degrading
spectral resolution). The LFR is also capable of reducing any periodic noise signal resulting
from surrounding electronics and equipment or ground loops.
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