| 详细介绍 |
|
Description
The model 21CN NMR (Nuclear Magnetic Resonance) Gaussmeter is designed for operation with any research or service application where high precision measurements of stable magnetic fields are required. The NMR operates on a principle of the swept-frequency measurement and differs considerably from conventional automatic NMR instrumentation utilizing an external modulation of magnetic field to be measured. Due to this new technique, the model NMR family of instruments are the fastest and most flexible gaussmeters / teslameters available today.
The model 21CN NMR , due to the precision and repeatability of field measurements, may be used as a traceable standard for testing other instruments. It combines accuracy of measurement with simplicity of use and allows automatic tracking and locking of the magnetic field.
Measurement applications include: MRI system field mapping and shimming, magnetic field stabilisers, support instrumentation for EPR and NMR spectrometers, particle accelerator beam handling, research on field-dependent material characteristics, as well as the checking of magnets and electromagnets.
Features
Magnetic field intensity mode Measures relative field homogeneity
NMR signal amplitude mode No magnetic field modulation required
Only one probe required(0.76-19.3kG range) Tracks extremely fast changing fields
Axial/Transverse measurements up to 13T(130kG) Correction signal for magnetic field control
Thinnest flexible probe available on the market RS-232 communications software
Wireless data transmission (optional)
Accessory options
Low field probe ------------------------------------- Field range –320G to 780G (32mT – 78mT)Probe length – 10.6mm
High field axial probe ------------------------------ Field range –18kG to 130kG and 8kG spanProbe length – 12.0mm
High field transverse probe (with heavy water tip)------------------PROBE 1-------------------PROBE 2 Field range –17kG to 30kG (1.47T– 3T) Field range –18kG to 130kG (1.47T– 13T)
Miniaturized probe --------------------------------- Field range –0.8kG to 15kG (0.08 T– 1.5T)Diameter- 5.0mm , length- 80mm
Holder, special, measurement head --------------- Adaptable for client electromagnet
Converter, RS232 / RS-485 ------------------------ For long distance data transmission
Modem , radio -------------------------------------- Radio modem for RS-232C port (200m wireless transmission to PC equipment with the same modem)
Software , MAG – PRO ---------------------------- For computer control, data acquisition and data processing.
Cable , measurement head to instrument -------- Custom dimension up to 39ft. (12m)
|
| 功能描述 |
|
| Field range |
760G-19.3kG (76mT-1930mT) * middle probe |
| Searching rate (max) |
50μG/s |
| Tracking rate (max) |
90μG/s |
| Resolution |
0.001G (0.1Μt) |
| Response time (while tracking) |
20-120ms |
| Absolute Accuracy |
+/- 5.0ppm |
| Relative Accuracy |
+/- 0.1ppm |
| NMR signal amplitude resolution |
>0.5% |
| Field gradient tolerance |
0.02%/cm |
| Correction signal(for magnetic field con |
Digital value plus sign from any magnetic filed chosen |
| Probe dimensions |
Diameter-8mm , length - 41mm |
| Display |
20 characters, one line LCD with backlight |
| Communication ports |
RS-232 and IEEE-488 |
| OCXO crystal oscillator with: |
|
| Clock accuracy |
0.01ppm /day ** |
| Clock aging stability |
2.0 ppm /year |
| Cable, measurement head |
300cm |
| Power requirements |
115V/230V, 20W , 50/60 Hz |
| Dimensions |
258(mm) x 102(mm) x 312 (mm) |
| Weight (with head) |
5.9 kg |
| |
