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The ALV-7002/USB Multiple Tau Digital Correlator is now available ! (Nov. 09) From 12/2009 on, another new member of the
ALV-MultiCorr Series further completes the range of Multiple Tau digital realtime correlators. The USB2 based ALV-7002/USB offering identical correlation performance compared to the ALV-7002, however at further reduced power consumption, footprint and weight. Equipped with the possibility of evaluating up to five user I/O pins for level detection or frequency measurement, it can directly be used to replace all ALV-500X/600X correlators that were used not only to compute the correlation
function, but for temperature/monitor diode measurements as well (as in ALV-Goniometer Systems). The extremely small power consumption of just 550 mW at full operating condition, the small weight (160 g) along with the small, but still very robust anodized aluminum housing makes this product ideally suited for mobile use as well. As the first product of the ALV-MultiCorr correlator series this product can be ordered with the optional “highly stable clock generator option” (see the details here). |
New features for the ALV-LinCorr (Sep. 09) The ALV-LinCorr now features an additional “batch mode” as well as the possibility to “pre-delay” the direct input channel of the correlator. See all details here. |
A new member of the MultiCorr Series - the ALV-7002 From 8/2008 on, a new member of the ALV-MultiCorr Series further completes the range of Multiple Tau digital realtime correlators. With two simultaneous auto- or cross-correlation functions being computed with 100 ns initial sampling time using the well known ALV-16/8 Multiple Tau channel spacing, it is the “most identical” replacement of the ALV-5000/E correlator series, however offering the well known advantages of the MultiCorr Series such as the lack of any input scaling required for input count rates up to several 10 Mcps, low power consumption etc. The ALV-7002 is primarily designed for standard single or dual detector DLS and FCS experiments or (pseudo) cross correlation experiments, were both cross correlation functions CROSS 0/1 and CROSS 1/0) can be computed simultaneously. Further details can be found here. |
VISTA compatibility of the ALV-Software The ALV-Software was tested on several VISTA based PCs so far and no compatibility issues were found (you may, however, depending on
the actual configuration of your VISTA OS, need to download a compatibilily update for the help system from Microsoft). ALV still recommends the use of WINDOWS-XP in favour of WINDOWS-VISTA though, in particular because of the significantly reduced hardware requirements and the well known excellent overall stability of |
Application Note on “Triangular Averaging Distortions” Find here an application note (PDF) describing the source of the so called “Triangular Averaging Distortions”, their effective magnitude for different kinds of correlation functions and how to fully remove them from a correlation function - and learn why a 16/8 channel Multiple Tau implementation performs better than the so called “high resolution” Multiple Tau Correlation schemes. |
Technical Data of the ALV-LinCorr Linear Tau Correlator Interested in a linear sampling time correlator with 2048 correlation channel and full, real-time multi-bit correlation capability ? Click here to learn more about the new ALV-LinCorr ... |
Introducing the new ALV-MultiCorr Multiple Tau Digital Realtime Correlator series
After serving as a successful and reliable tool in many photon correlation experiments for nearly 20 years (accounting for all its predecessors), sales and production of the ALV-5000/60X0 Multiple Tau Digital Real Time Correlatoris is discontinued from September 2007 on (latest orders accepted by this date). As an enhanced replacement for the ALV-5000/60X0 Multiple Tau Digital Real Time Correlator Series, ALV introduces the ALV-MultiCorr Digital Real Time Correlator Series per July 2007 with taking orders on the first models of this series by this date with delivery by early Q4/2007 ...
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Langen, 1st of July 2007New version of the ALV/CRTU Cuvette Rotation Unit now features stepper motor drive From 01.04.2007 on, the ALV/CRTU will be shipped with geared stepper motors. These ensure a high torque drive capability maintaining the set speed at extremely high precision, which - in combination of a wide selectable speed range (>1 : 32 now) is almost impossible to achieve with DC-motors. The high gear ratio of the used gears ensures smooth travel even for low speeds without noticable “stepping” effect, but for extremely low
speeds only. |
ALV/LSE-5004, the latest model of the ALV-Light Scattering Electronics is now available From 01.04.2007 on, the ALV-Light Scattering Electronics ships in the latest version, ALV/LSE-5004. Featuring some significant improvements over previous models, it as well shows significantly reduced power consumption and is of course fully RoHS compatible. In detail, the following features have been added compared to the ALV/LSE-5003 version
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RoHS conformal products |
ALV’s new building
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ALV moving to a new building on October 27/28 2005 With moving to the new building, a newly build facility and therefore customized to ALV’s needs, ALV will be able to serve the customers needs even better, because of an significant increase in available space combined with a reorganisation of all the processes involved in manufacture/assembly and test of our products. In addition, a training center for groups of up to 12 people is part of the new building, offering the opportunity to have combined training with direct access to the instruments etc. pp. An update on this with pictures will follow as soon as possible. All phone/fax numbers and e-mail addresses as published on this homepage will be unchanged, still, from October 31 on, the new address for shipments to ALV should read ALV-GmbH |
Support for ALV-Software running on WIN-95/98 operating system to be discontinued by 01/01/2005 |
Important Information for using ALV-Correlator Control Software with INTEL HyperThreading CPUs ! All ALV-Correlator Control Software versions < 3.0.2.0 will not work properly with HyperThreading CPUs. These CPUs, with their ability of simulating two “virtual” CPUs being installed on the system, seem to lack certain synchronization mechanisms which were naturally “given” with just a single CPU installed and are present in an real DUAL-CPU system as well. Effectively these CPUs must be declared “incompatible” in these situations, situations, which do not introduce problems for the overwhelming number of applications, since exact synchronization of software threads is not at all required, but do infact impose significant problems, whenever such synchronisation is mandantory, as is the case in many measurement oriented applications. Possible Workarounds in case you encounter problems (in particular strange CR-Displays, obviously wrong AutoScaling or hang-up in the AutoScale routine , spurious count-rate alerts ...):
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