Multiport II Multichannel Analyzer
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Features Up to six independent Multichannel Analyzers (in-the-field customer upgradable) Each MCA fully computer controlled 16K ADC, 1 µs fast fixed conversion time with linearization enhancement circuit for excellent nonlinearity Fully buffered memory allowing simultaneous ADC memory write and spectrum transfer to host computer Full I/O control (including sample changer) On-board data backup Suitable for HPGe, NaI(Tl), CdTe, PIPS®, X-PIPS™ and other detector technologies Communications interface: Ethernet/USB or USB only Fully supported by Genie™ 2000 software Multiport II Multichannel Analyzer Description The Multiport II is a double width NIM intended for use where existing amplifier and HVPS modules are to be combined with a high analog performance, low-cost ADC/MCA. It provides greater flexibility than traditional bus plug-in boards but at a comparable cost. Multiport II can be purchased in versions from one to six inputs. Units with fewer than six inputs can be field upgraded with additional inputs. Two communications interface versions are available: Ethernet/USB and USB only. The Multiport II is easy to install and easy to link. Host computer interfacing is accomplished via a standard USB port or a standard Ethernet port (unshielded twisted pair) and through standard protocols. These widely recognized interfaces make the Multiport II compatible with a wide range of computer platforms, so the Multiport II user need not worry about compatibility as computer bus standards evolve. Also, multiple Multiport II units can be totally remotecontrolled from a single computer. The Multiport II provides better performance and lower noise than plug-in PC board based MCAs by keeping all sensitive components out of the computer itself and by putting the MCA close to the radiation detectors. Furthermore, there is only one cable between the host computer and the Multiport II NIM module for simplicity of inter connection. Multiport II is suitable for use with a wide range of radiation detectors. Selecting a proper preamplifier, amplifier and high voltage power supply, makes Multiport II compatible with NaI(Tl), HPGe, SiLi, CdTe, ion implanted, plastic scintillation, BGO and other detector technologies. Modular NIM packaging makes it easy to reconfigure systems as needs change or as new technologies become available. The use of parallel processing technique results in an effective zero time to “add one” in memory, resulting in a fast conversion time. Furthermore, the on-board implementation of the sliding scale method improves the linearity and the channel uniformity. To protect long collections from power failure, the Multiport II features on-board data and settings retention at fixed time intervals for each of its MCAs. Multiport II provides full I/O support, including Canberra standard PUR/LTC, sample changer synchronization and advanced PHA operations. For more flexibility and more applications, Multiport II supports both Pulse Height Analysis (PHA) and Multichannel Scaling (MCS) modes of operation. In MCA mode, a single channel analyzer (SCA) is also available as well as input/output that allows acquisition to be synchronized by external modules. Nuclear Measurement Solutions for Safety, Security and the Environment 

Multiport II Multichannel Analyzer SCA output works in both modes, PHA and MCS. In MCS mode, SCA pulses may also be selected as input pulses. The maximum input rate is 10 MHz in TTL input mode. Software Support The Multiport II is fully supported by Genie 2000 software family suite. Multiport II is fully remote controlled under Genie 2000 (parameters such as gain, LLD, ULD, ADC zero and MCS parameters) via standard Genie 2000 tools. Genie 2000 supports a wide range of time proven spectral analysis algorithms, modern spectrum display and user interface as well as a variety of special...

Multiport II Multichannel Analyzer LONG TERM DRIFT – <±0.005% of full scale/24 h at a constant temperature. ■ PEAK SHIFT – <±0.025% of full scale at rates up to 100 kHz. ■ ADC DEAD TIME – Linear gate time +1.2 µs. ■ CHANNEL PROFILE – Typically flat over 90% of channel width. ■ SIZE – Standard double width NIM module 6.86 x 22.12 cm (2.70 x 8.71 in.) per DOE/ER-0457T. ■ NET WEIGHT – 1.36 kg (3.0 lb) with one MCA/ADC board. ■ INPUT RATE – Up to 10 MHz. DWELL TIME – Software selectable from 1 µs to ≈71 min, with varying resolution in increments of 1 µs. ■ SWEEP SELECTION – Software selectable...