AVANCE AV with SGU - TwoBay General Description

AQS (TwoBay)

The Acquisition Control System (AQS) has multiple digital and RF/AF analog functions. On the left hand side of the AQS, space is assigned to house 8 thin digital boards. In the center and the right hand side, 8 slots are reserved for analog RF-shielded cassettes. Pulse programs run on the digital boards and real time control commands are then transferred to the SGU’s in the analog section.

The CCU runs as a "diskless UNIX" client and controls the TCU3, up to 4 FCU3, the RCU and the GCU. The user’s pulse program runs on the TCU3. Timing, amplitude, phase and frequency data is transferred from the TCU3 to the FCU3’s. In each single channel of the FCU3’s, shape lists are selected and transferred as digital data to each corresponding SGU, together with the timing data from the TCU3. A high speed 560 Mbit/s LVDS link connects FCU3’s to each SGU. A custom designed IC on the SGU generates all RF phases, frequencies as well as shapes and levels of transmitter pulses. Pulses are routed and fed to external linear amplifiers.

The NMR signal is mixed down to audio frequency in the RX22 receiver system and then converted to digital data by the ADC. The local oscillator frequency is also generated in the SGU. Digitized NMR signals are fed to the RCU which performs real time digital filtering and accumulation. The optional GCU generates the gradient shapes for GRASP experiments.

BSMS/2

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).

HPPR preamplifier module

The HPPR and HPPR/2 amplify, filter and route the NMR response signals from the probe to the RX22 receiver. It switches the RF transmitter output to the probe.

Probes

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

Magnet

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

GRASP (optional)

GRASP (Gradient accelerated spectroscopy) uses self screening gradient cools and allows for preemphasis compensation of residual Eddy Currents.

Sample Changer (optional)

Bruker Automated Sample Changer's (BACS) allow the user to easily and effectively perform automatic experiments.