The NPM3100 series product is a digital neutron pulse monitor for use with proportional gas tube neutron detectors. The NPM3100 includes high voltage source, charge sensitive amplifier, shaping amplifier, variable gain, discriminators (upper/lower), ADC,microcontroller, digital counter, multichannel analyzer (MCA), real‐time clock, data logging and SD card storage.
It is also capable of time stamping individual neutron counts and tagging data for use in coincidence counting detector arrays. The NPM3100 is controlled by a simple command
set within a terminal window or GUI software in an HTTP browser.
The following specification sheet includes all available functionality for this model.
Components & Features | Description |
NPM‐3100E (Neuchrometer) | Neutron pulse monitor (NPM) with Power Over Ethernet interface. For use with gas proportional neutron detectors including Helium‐3, BF3 and Boron‐lined types. |
Mechanical | |
Dimensions | 1in OD x 5.2in Length (2.54cm OD x 13.2cm). Cylindrical profile. |
Enclosure Finish | Anodized aluminum. |
High Voltage Connector | HN (male). |
Communication and Power Connector | RJ45. |
LED | Indicator LED (red) on rear panel. |
Electrical | |
Analog Components | |
High Voltage (HV) | 0 to 3,000V. RMS noise 0.010V. HV level user adjustable. |
Detector Capacitance Range | Compatible with detector capacitance of 5 to 100pF. Custom ranges available. |
Charge Sensitive Amplifier (CSA) | Integrates input charge pulse and converts to voltage. 1V / pC or custom. |
Pulse Shaping Electronics | Pulse shaping time constant 1 to 10us (typical). Pulse shaping decay time 10 to 100us (typical). |
Dead Time | Minimum time between successive counts, 10 to 100us (typical). |
Neutron Counting Rat | 100kHz (maximum). |
eAmplifier Electronics | Gain range 1.0 to 20.0, user selectable |
Digital Components. | |
Microcontroller & Timer | ARM Processor, 160MHz. |
Nonvolatile memory | Up to 128Gb. |
Analog‐to‐Digital Converter (ADC) | 12 bit, 8Msps (mega samples per second). |
Temperature & Humidity Sensor | Temperature: range ‐40C to 124C; resolution 0.01C; accuracy +/‐ 1C. Humidity: range 0 to 100% RH; resolution 0.03% RH; accuracy +/‐ 3% |