ASPEC-927 Dual Input MCB

ASPEC-927 Dual Multichannel Buffer• Dual fast (1.25-µs) ADC and memory in a single width NIM
• Dual 16k ADCs, compatible with MAESTRO for Windows MCA emulation program 
• Live time corrections including ZDT
• PUR, BUSY, and GATE inputs
• Interfaces via USB-2.0
• True live display of data
• Synchronize this unit with your sample changer or process control
• On board memory allows fast downloads to your PC
• Two inputs in a single wide NIM

The ORTEC Model ASPEC-927 interfaces to a personal computer via the USB-2.0 interface and includes MAESTRO emulation software. Each ASPEC-927 is presented in a single width NIM chassis and includes two independent 16k ADCs, and 512 kb of memory. The successive-approximation 16,384 channel ADCs with 1.25-µs conversion time has selectable conversion gain settings for 8,192, 4,096, 2,048, 1,024, or 512. Dead time corrections can be accomplished using the Gedcke-Hale Extended Live-Time method or the ZDT method.

A single computer subject to the USB-2.0 speed of data transfer can control multiple units using USB-2.0 hubs.
  • Literature +

  • Specifications +


    Performance
    ADCs
    Successive-Approximation type with sliding scale linearization.
    Maximum Resolution 16k: 16,384 channels, software selectable as 16,384, 8,192, 4,096, 2,048, 1,024, and 512.
    Dead Time Per Event 2 µs including memory transfer.
    Integral Nonlinearity <+0.025% over the top 99% of the dynamic range.
    Differential Nonlinearity <±1% over the top 99% of the dynamic range.
    Gain Instability <+50 ppm/°C.
    Dead Time Correction Software selectable for extended Live-Time correction according to the Gedcke-Hale method or ZDT Live-Time corrections which monitors the counting rate and adjusts the dead-time for fluctuating counting rates.
    Data Memory 512 kb.
    USB Interface Interfaces to a PC via USB 2.0. Data transfer speed is 480 Mbps maximum.

    Inputs and Outputs
    Inputs
    Accepts positive unipolar, positive gated integrator, or positive leading bipolar analog pulses in the dynamic range from 0 to +10 V; +12 V maximum; semi-Gaussian-shaped time constants from 0.25 to 30 µs, gated-integrator-shaped time constants from 3 to 30 µs, or delay-line-shaped with widths >0.25 µs. Zin = 1 kΩ, dc-coupled. No internal delay, BNC connector.
    ADC Gate Optional TTL input. Computer selectable Coincidence mode, Anti-coincidence mode, or Off. Signal must occur prior to and extend 0.5-µs beyond the peak of the pulse; BNC connector. Zin = 1 kΩ.
    PUR Pile-up rejection input; accepts TTL signal; signal must occur prior to peak detect. Zin = 1 kΩ. BNC connector.
    Busy Busy input used by live-time correction circuits. Accepts TTL signal; signal must occur prior to peak detect. Zin = 1 kΩ. BNC connector.
    Sample Change In 9-pin "D" connector. Zin = 1 kΩ. Input for ADC 1 is pin 1. Input for ADC 2 is pin 5. Ground is pin 9.
    Sample Change Out 9-pin "D" connector. Zout = 1 kΩ. Output for ADC 1 is pin 3. Output for ADC 2 is pin 7. Ground is pin 9.
    USB-2.0 Standard USB connection via a supplied 10-ft. cable.

    Indicators
    ADC1 Indicates activity for ADC-1.
    ADC2 Indicates activity for ADC-2.

    Software Controls (Operates with included MAESTRO — see data sheet for details.)
    ADC LLD
    Computer controlled from 0 to 100% full scale.
    ADC ULD Computer controlled from 0 to 100% full scale.

    Presets
    Real Time/Live Time
    Multiples of 20-ms.
    Region of Interest Peak count/Integral count.
    Data Overflow
    Terminates data collection when any channel exceeds 231–1.
    Peak Uncertainty Stops acquisition when the statistical or counting uncertainty of a user-selected net peak reaches the specified value.
    Nuclide MDA Stops data collection when the value of the Minimum Detectable Activity (MDA) for a user-specified MDA reaches the specified value.
    Live Time Correction Gedcke-Hale, ZDT.
    Gate Coincidence, Anti-Coincidence, Off.

    Electrical and Mechanical
    Power Required +6 V, 250 mA; +12 V, 165 mA; –12 V, 165 mA.
    Weight Net 0.9 kg (2 lb).  Shipping 2.25 kg (5 lb).
    Dimensions NIM-standard single-wide 3.43 x 22.13 cm (1.35 x 8.714 in.) front panel per DOE/ER0457T.
  • Ordering Information +


    Model Description
    ASPEC-927      Dual 16k ADCs in a single wide NIM. Includes MAESTRO and 10-ft. USB interface cable.
    927-OPT1 Female BNC adapter cable for Sample Changer I/O. This option provides cable connections to the Sample Changer inputs and outputs.