The Acquisition Control System 2 (AQS/2) for the AVANCE II OneBay/MicroBay and TwoBay is the consecutive development of the well proven AQS chassis and still allows almost all of the former configurations but also offers new configurations like the new digital receiver electronics with the recently developed RXAD (receiver with integrated analog to digital converter) and DRU (digital receiving unit). Conspicuous signs are the vanished analog and digital interconnections between receiver, A/D converter and digital filters at the front side of the new AQS/2 system.

On the left side of the AQS/2 chassis is a conventional VME32 bus incorporated with the BRUKER extension (AQ-Bus, F-Bus) for 6 slots. On the right side are 10 slots for the extended AQS/2 User bus, which is able to supply a lot of different AQS functional units (signal generators, receivers, preamplifiers, amplifiers, etc.).

Every slot on the AQS/2 User Bus backplane is hardware coded, so that every unit can be addressed via its unique slot address. The AQS/2 User Bus backplane connector pin assignment is identical for all ten 6TE slots. That means each common signal and signal path, respectively, is accessible on every slot (exceptions are power supply for BLA2BB, the data transfer to the DRU and signals for the reference board).

By the elimination of the acquisition control and data transfer via the CCU and VME bus, a new and more powerful synchronization channel has been introduced.

The already in the basic channel concept defined "sample information bus" is now being used for the control of the realtime actions in the digital receiver chain. Synchronous scan information (e.g. receiving phase, file handle, wobble control, accumulation and display management) is distributed over this bus from the acquisition main controller (timing control) via the observe SGU.

The BSMS/2 unit provides NMR sample control (SLCB), shim (SCB) and H0 current (LCB) control, houses the digital lock (LTX, LRX), the Variable Temperature Unit (VTU) and the optional gradient amplifier (GAB).

The HPPR/2 amplifies, filters and routes the NMR response signals from the probe to the RX22 receiver. It switches the RF transmitter output to the probe.

General information common to most Probes can be found here. See the appropriate NMR probe documentation for details.

General handling and maintenance information for all magnets can be found here. Specific documents are supplied with each magnet.

The new GREAT for AVANCE III no longer applies preemphasis to the gradients on its own. Instead, the preemphasis is digitally computed and applied to the digital gradient data by an external unit, the DPP (Digital Preemphasis Processor). The preemphasis is now calculated by a DSP and works on the digital input of the GREAT.

Bruker Automation allows the user to easily and effectively perform automatic experiments.