72 (327) BRUKER BIOSPIN User Manual Version 002
Basic Setup Procedures
propriately. Fourier transforming a normal FID in such a window will generate an
incorrect spectrum window.
Therefore:
Never start an acquisition in such a window, first read in the procno where popt
was started using the rep n command where n is the source procno.
Figure 4.17. The popt Display after Proton p1 Optimization
The figure above shows the popt display after proton p1 optimization, the biggest
signal is obtained at 6 µsec in this case.
Once you have obtained a 90-degree pulse for a given power setting, you can cal-
culate power levels for different rf fields using the AU program calcpowlev. Type
xau calcpowlev into the command line and follow the instructions in the popup
window.
Calculate the power level (in Watts or dB) required to achieve a 4.5 µsec proton
90 degree pulse. In this case, 6 µsec were obtained. The command calcpowlev
calculates a power level 2.5 dB higher than used above to achieve 4.5 µsec pulse
length. Set the new pl1 as calculated and check whether 2*4.5 µsec for p1 will
give a close to zero signal. This is a safe power level for all probes for pulses up to
100 msec. length.
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