The two probes can be calibrated in either order. If you accidentally entered an incorrect datum into a blue cell, you can replace it with the correct value and click “calibrate” again. From your calibration data, the NMR frequency, magnetogyric ratio, NMR rf field strength, and coil and circuit performance are calculated and displayed in the left column. Press the “calibrate” button in the bottom left corner. To get the correct results, select calibration data from the list for the mode of interest (H/X or H/X/Y) and the channel of interest (1H, MF, or LF).Įnter the results of the calibration of your probe into the blue cells. The same is true for the new JRI-Doty MAS probes. For example, the Bmax can operate as H/X or as H/X/Y.
Some probes can operate in two very different modes. Information about the results from the probe’s calibration is displayed in the second column. It will be scaled appropriately.Ĭhoose a DSI probe from the list under “DSI calibration and product name”. Perhaps you have data for an E-free or T3 probe at 400 MHz, and want to see how one would perform at 600 MHz.
It will be scaled quite accurately for the field entered later for SNR calculation. For example, we don’t list data for the Bmax at 700MHz, but that’s okay. The applet knows how to scale appropriately, assuming the probe circuit for the field and sample of interest is similar to the one for which you (or we) have calibration data. The calibration data need not be for the field, nuclide, sample size, pulse length, or temperature for which you’d like to see SNR calculated. The applet calculates the new η fη eQ L, the new pulse power, and the signal-to-noise ratio for each probe. In the calculation stage, a new sample and other conditions are assigned to both probes. In the calibration stage, it calculates the coil and circuit performance (η fη eQ L) of each probe based on experimental data. We have data for several probe types (solids and liquids), samples, and nuclei. The SNR applet allows you to compare the signal-to-noise ratio and other performance values of any well-tested probe to a comparable DSI probe. NMR SNR following a 90-degree Pulse at Thermal Equilibrium
0 kommentar(er)
