ECZR NMR spectrometer (JNM-ECZR series) Model：JNM-ECZR NMR

Spectrometer Control Computer

The JNM-ECZ spectrometer control computer（SCC) is a high performance computer with large capacity hard disc, and is used for execution of pulse sequences, signal-to-noise calculation during measurement, storage of data, data processing, etc. are all possible and independent of the workstation.
All measured data is written to the SCC hard disc without fail, thus the SCC also serves as a data server.
Even if there is any kind of failure to the workstation computer or network during sequential measurements, all measurements that were submitted will be executed normally and the results will be written to the SCC’s disc. Even in a multi-user environment where many users require different measurements and processing, stable operation of the instrument is assured.

Multi-Sequencer

The sequencer controls RF, lock and PFG channels during pulse sequence execution. The JNM-ECZR spectrometer can use multiple slave sequencers which control each of these channels, and a master sequencer which synchronizes all slave sequencers. Individual slave sequencers can execute pulse sequences irrespective of synchronous or asynchronous. Thus, by controlling several slave sequencers by the master sequencer, any NMR pulse sequence can be carried out.
Hence, the JNM-ECZR spectrometer can accommodate up to 8 nuclei, 32 frequency sources and PFG simultaneously. It can compile and execute any complex pulse sequence, even those that may be developed in the future.

STS (Smart Transceiver System)

The Smart Transceiver System (STS) is a highly advanced integration of RF sequencer, DDS (Direct Digital Synthesizer), FSU (Frequency Synthesizer Unit), transmitter, receiver, acquisition unit and gate control unit into a single transceiver board. This is equivalent to integrating the basic composition of an NMR system onto one board.
The standard instrument composition is one source with 2 nuclei, 8 frequencies and one receiver. The JNM-ECZR spectrometer can accommodate up to four RF transceiver boards, and so can support 8 nuclei, 32 frequencies and 4 receivers.

Highly Precise Digital Control

The STS used in the JNM-ECZR spectrometer realizes control at the highest speed for frequency, phase and amplitude modulation, with a control time resolution of just 5ns. This high speed digital control is extremely useful for high speed phase modulation pulses which are required for the most recent NMR pulse sequences. The same time control performance is offered for various external systems.

High Performance DDS

The DDS (Direct Digital Synthesizer) unit of the JNM-ECZ spectrometer available from the STS, can create a very wide offset range.
Using an appropriate probe, this enables a “pseudo 3 nucleus” measurement with the standard instrument. For example, 13C{1H}{19F} measurement is possible with the standard configuration of JNM-ECZ spectrometers.

Receiver

The receiver of the JNM-ECZ spectrometer is controlled by the sequencer. A reference frequency generated in the receiver can be dynamically modulated for phase and amplitude even during FID sampling.
DQD (Digital Quadrature Detection) by high speed A/D conversion at 16 bit 100 Msps, not only improves the effective dynamic range for quantized noise, but also reduces unwanted signals such as IMD, by over-sampling at high rates. In addition, the digital receiver filter optimized for NMR ensures accurate quantitative results.
The high dynamic range of the JNM-ECZ spectrometer enables the observation of very small signals. The 13C satellite signals of acetone in a mixed sample of H2O:DMSO:Acetone=18570:104:1 (approx.10 % D2O) are clearly observed (approx.1/3400000).

What is gradient shimming?

This is a high speed shimming method that measures the magnetic field distribution (magnetic field map) of the sample, compares it to a standard map then calculates and applies the required shim values for correction so that the magnetic field map becomes uniform.


Spectrum before and after resolution adjustment by gradient shimming. At 49 sec. resolution has improved.


No-D NMR measurement using resolution adjustment by selective pulse gradient shimming where the solvent has multiple signals (top). Solvent signal is automatically suppressed by the ‘WET’ method (bottom).


Resolution adjustment is possible by gradient shimming in the same manner as 2H, by selecting the 19F signal.

Temperature Control System

The temperature control system enables stable measurements using a newly-designed heater with improved response. The JNM-ECZ spectrometer allows faster and more stable operation of peripheral devices using the new high speed bus control line.

Head Amplifier Chassis

The head amplifier chassis has various functions related to probe and the super conducting magnet. A touch-panel display is located on top of the head amplifier chassis, offering an intuitive user interface.
During probe tuning, reflection dip and reflection value are indicated, whilst during cryogen refilling, the actual level of cryogen in the magnet is indicated in real time. It makes the routine maintenance related to probes and super conducting magnet convenient and efficient.

Power Amplifier

The Power Amplifier amplifies the RF pulse and outputs it to the probe. Various models are available depending on the purpose but all power amplifiers exhibit excellent linearity and response performance.
The JNM-ECZ spectrometer is designed so that the power amplifier keeps constant thermal stability, regardless of output / non-output of RF pulses. Thus stable RF output is achieved for every kind of measurement, regardless of number of pulses, pulse widths, intervals etc. used within the pulse sequence.

Improved functionality and unique design

The spectrometer features enhanced functionality, ease of operation and an attractive design.

Intuitive control software

Incorporating an additional interface for simple, routine operation, the Delta software for spectrometer control and data processing supports both simple and sophisticated applications. A minimum sequence of operation is needed for routine, standard analysis, such as selection of a solvent or measurement mode. For more complicated analysis with numerous conditions, the system will automatically define hardware parameters, including those for the spectrometer and probe, allowing the operator to set up only the conditions specific to the sample or research objective.


 

Flexible room layout

Compared to the JNM-ECAⅡ series, the spectrometer requires a 67 % more compact size.
All system units, including the magnet and compact auto multi sample changer, can be laid out efficiently in a small room.