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Features

• Integrated desktop MCA based on Digital Signal Processing (DSP)
• Excellent count rate and temperature stability
• Wide range of processing time parameters to allow precise match to detector characteristics and application requirements
• 16K Channel conversion gain/spectrum memory
• USB and RS-232 host interfaces allow simple connection to computer - no plug-in board or PC bus slot required
• Convenient small form-factor desktop package
• Full set of front panel indicators for HV, dead time and system status
• Performs pulse height analysis (PHA) or multichannel scaling (MCS)
• Digital oscilloscope to assist with setup
• Built-in power up diagnostics
• Supported by Genie™ 2000 spectroscopy software

Description

The DSA-1000 is a full featured 16K channel integrated Multichannel Analyzer based on advanced digital signal processing techniques (DSP). When paired with the computer of choice, the DSA-1000 becomes a complete spectroscopy workstation, capable of highest quality acquisition and analysis. The instrument interfaces to all existing detector technologies like HPGe, NaI, Si(Li), CdTe or Cd(Zn)Te, PIPS^® or X-PIPS.

The DSA-1000 offers cost effective, no-compromise DSP-quality spectroscopy in a very compact package. It is operated through CANBERRA's Genie 2000 spectroscopy software which provides the user with ultimate flexibility. A wide range of application specific software options are available under the Genie 2000 family.

The excellent performance of the DSA-1000 derives from the application of DSP technology. Earlier analog spectroscopy systems were prone to count rate and environmental instabilities that required continual adjustment of the signal processing subsystem - and often compromised analysis results. With the DSA-1000, these problems are dramatically reduced, without bulky packages or NIM bins.

The heart of the DSA-1000 is the Digital Signal Processor subsystem. Unlike conventional systems, which digitize the signals at the end of the signal processing chain, the DSA-1000 digitizes the preamplifier signals at the front of the signal processing chain. This approach minimizes the amount of analog circuitry resulting in increased stability, accuracy and reproducibility.

The use of DSP technology also improves the overall signal acquisition performance. Signal filtering functions previously implemented in traditional analog electronics are limited. DSP allows filtering functions and pulse shapes that are not realizable using conventional analog processing techniques. The result is a more efficient trapezoidal filter function, which exhibits less processing time, less sensitivity to ballistic deficit, and superior resolution. With trapezoidal filtering, the pulses can be processed more rapidly and accurately, so the spectrum resolution is enhanced while throughput is increased.

The DSA-1000 offers peak gain stability in some cases a factor of two to three times better than past generation analog products while Zero drift is barely measurable over the full operating temperature range of the instrument.

The DSA-1000 supports both the traditional Pulse Height Analysis (PHA) mode as well as a multichannel scaling (MCS) mode for time varying applications. The MCS mode can display data from either an external TTL input, a full spectrum integral or a Region of Interest (ROI).

Two methods of host communications are supported by the DSA-1000. The preferred method is the Universal Serial Bus (USB) interface which provides fast host communications at 12 Mbits/second. USB provides the additional capability of having multiple units attached to a single host/port via a USB hub.

The second method of host interface is a standard RS-232 serial connection. Due to the communications rate constraints of serial ports, the DSA-1000 has been designed for highly compressed/optimized communications.

To facilitate optimal pole/zero adjustment, the DSA-1000 is equipped with a Pole/Zero Assistant (PZA) feature. The PZA allows the user to adjust the pole/zero cancellation circuit while the DSA-1000 analyzes and displays the degree of overshoot and undershoot exhibited by the filtered signal. The user simply moves the P/Z control until the PZA indicator is centered - indicating optimal adjustment.

With the digital oscilloscope, the user views a graphical reconstruction of the digitized, filtered signal. Scaling and trigger functions are similar to those of an actual oscilloscope.

A complete set of front panel indicators provides real-time information on the DSA-1000's HV setting, system dead time, and overall system status.

Genie is a trademark of CANBERRA.