GBS Elektronik MCA 166 - Manual (Page 48)

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3. Nonlinearities
•
Differential non-linearity (over 95% channel range) <2%
• Integral non-linearity (over 95% channel range) <0.1%
4. Peak capturing
•
Works with pulse of gaussian shaping amplifier (range of shaping time constant
between 0.5 and 5 µsec)
5. Temperature Stability
•
TK 100 (ADC), TK 500 (Amplifier)
6. Discriminators and threshold
•
Digital LLD and ULD (allows channel-wise cutting)
• Analogue threshold (2...60% of ADC range)
7. Multi Channel Scaling (MCS) mode allowing to count the following pulses
•
TTL input pulses (minimum width of flat top 0.2 µsec) not routed through the ADC
(maximum rate 1 MHz)
•
LLD/ULD counting mode, counting pulses within a preset digital window
• Countrate derived from internal amplifier ICR signal (maximum countrate
determined by countrate limitation of amplifier )
•
Dwell time 0.01 - 500 sec
8. Spectrometric performance:
•
Resolution (FWHM) for typical 500 mm² planar HPGe detector for countrates <
10000 cps and a Co-57 source at 122 keV:
610±20 eV at 1 µsec shaping time
580±20 eV at 2 µsec shaping time
•
Peak shift:
< 0.5% for 1 µsec shaping time and count rates from 1000 to 70000 cps
< 0.2% for 2 µsec shaping time and count rates from 1000 to 40000 cps
deterioration of FWHM < 5% for both conditions
•
Throughput in memory:
at least 25000 cps in memory at 50000 cps input rate and 1 µsec shaping time
at least 13000 cps in memory at 30000 cps input rate and 2 µsec shaping time
4.1.3 Power supply
• Power supply adequate for commonly used NaI, HPGe, CdTe and proportional
counters
•
Current limited mode with indication of overload condition through software; short
circuit protected and automated recovery after overload or shortening
4.1.4 Preamplifier Voltages:
• ± 12 V
• Maximum current: 60 mA for each of the voltages
• ± 24 V