Specifications – BNC SAM 935 Portable Gamma Spectroscopy System User Manual
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SAM 935™ Instruction Manual
61
8.
Specifications
Preamplifier
Type:
Charge Sensitive
Input:
Negative Current (anode)
Gain:
-5 mV/pC
Amplifier
Type:
Pseudo-Gaussian
Shaping:
Bipolar, 3 µsec peaking time
Coarse Gain:
1x, 2x, 4x, 8x
Fine Gain:
1.000 to 2.550 in steps of approximately 0.0006
Int. Non-Linearity:
< ± 0.1 %
Gain Instability:
< ± 0.02 % / °C
Initial Offset:
< ± 20 mV adjustable to zero
Offset Instability:
< ± 20 µV / °C
ADC
Type:
Base Converter 14-bit Successive Approximation
Conversion Modes:
Linear - 256, 512, 1024 Channels
QCC - 256, 512 Channels (U.S. Patent 5,608,222)
Diff. Non-Linearity:
Linear Mode ( < ± 1.0 %)
Integral Non-Linearity:
Linear Mode ( < ± 0.1 %)
Temp. Stability
Gain:
< ±0.01 % 20 °C ± 10 °C
Zero:
< ±0.01 % 20 °C ± 10 °C (of full scale)
LLD:
0 to 105% of full scale digitally adjustable in .1% intervals
ULD:
0 to 105% of full scale digitally adjustable in .1% intervals
Zero:
-5 % to + 5% of full scale, digitally adjustable
Controller
Processor
80C186 microprocessor at 20 MHz
Display
240 X 128 high contrast black-and-white FSTN graphics with CCFL
backlight
Controls
10-key custom keypad utilizing software programmable function keys
I/O
DB9M RS-232 port for printer or computer connection
Clock
Battery-backed-up clock calendar
Memory
All programming in EPROM, 768K battery-backed-up RAM for data and
parameters
Power
Power
Internal battery pack; external factory-supplied dual mode supply/
charger, 12w
Internal Detector (if present)
Voltage:
0 to 1200 Volts in 1-volt steps
Current:
1250 uA max
Temp Stability:
< ± 0.01 % / °C
Ripple:
< 50 mV peak-to-peak
Neutron Detector (if present)
Voltage:
0 to 1200 Volts in 1-volt steps
Current:
1250 uA max
Temp Stability:
< ± 0.01 % / °C
Ripple:
< 50 mV peak-to-peak