User Tools
playground:nmr
Differences
This shows you the differences between two versions of the page.
| Both sides previous revision Previous revision | Next revision Both sides next revision | ||
|
playground:nmr [2012/03/09 15:25] jacobs |
playground:nmr [2012/03/09 15:27] jacobs |
||
|---|---|---|---|
| Line 20: | Line 20: | ||
| - set the VERTICAL GAIN control for approximately 1/16-inch of "grass" on the face of the oscilloscope. | - set the VERTICAL GAIN control for approximately 1/16-inch of "grass" on the face of the oscilloscope. | ||
| - Now that the NMR is set to a frequency slightly lower than the desired frequency, we can begin slowly increasing the analyzer magnet control upward toward the current that will show a resonance on the NMR. Typical resonance patterns and control positions can be seen in the {{HVEC_NMR.pdf|Original HVEC NMR Manual}} figure 1. The resonance will enter the display from the right side and move across the CRT display from right to left. When the resonance is found and centered on the CRT display, the magnet flux (frequency) can be read on the HP counter located above the NMR Fluxmeter. Remember that because of magnet hysteresis and saturation effects, we can only increase the magnet current from this point on. If we decrease the magnet current we will have to recycle the magnet and start over for an accurate NMR flux value. | - Now that the NMR is set to a frequency slightly lower than the desired frequency, we can begin slowly increasing the analyzer magnet control upward toward the current that will show a resonance on the NMR. Typical resonance patterns and control positions can be seen in the {{HVEC_NMR.pdf|Original HVEC NMR Manual}} figure 1. The resonance will enter the display from the right side and move across the CRT display from right to left. When the resonance is found and centered on the CRT display, the magnet flux (frequency) can be read on the HP counter located above the NMR Fluxmeter. Remember that because of magnet hysteresis and saturation effects, we can only increase the magnet current from this point on. If we decrease the magnet current we will have to recycle the magnet and start over for an accurate NMR flux value. | ||
| - | - | + | |
| * {{HVEC_NMR.pdf|Original HVEC NMR Manual. Main frequency adjustment control and tracking feature now obsolete. See above new procedures.}} | * {{HVEC_NMR.pdf|Original HVEC NMR Manual. Main frequency adjustment control and tracking feature now obsolete. See above new procedures.}} | ||
| | | ||
playground/nmr.txt · Last modified: 2023/05/08 10:42 by carter
Page Tools
Except where otherwise noted, content on this wiki is licensed under the following license: CC Attribution-Noncommercial-Share Alike 3.0 Unported
