afm
Differences
This shows you the differences between two versions of the page.
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afm [2022/10/12 13:15] dublin |
afm [2023/09/18 12:01] (current) dublin |
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| - Place the sample to be imaged on the tray. Make sure that the stage x-y control thumbscrews are centered. | - Place the sample to be imaged on the tray. Make sure that the stage x-y control thumbscrews are centered. | ||
| - Make sure the vibration isolation stage is on and isolation is enabled. | - Make sure the vibration isolation stage is on and isolation is enabled. | ||
| - | - Raise the legs on the MFP-3D tripod to ensure the tip does not smash into the sample. | + | - Raise the legs on the MFP-3D tripod by ~5 turns to ensure the tip does not smash into the sample. |
| - Set the MFP-3D over sample | - Set the MFP-3D over sample | ||
| - Align Laser: | - Align Laser: | ||
| - | * Turn on the camera - Click the lower left icon with a picture of a TV on it | + | * Turn on the camera - Click the lower left icon with a picture of a camera on it |
| * Turn on the camera light - Switch on the box which sits on top of the AFM | * Turn on the camera light - Switch on the box which sits on top of the AFM | ||
| * Align camera on cantilever - Two knobs sticking up at the very rear of the MFP-3D | * Align camera on cantilever - Two knobs sticking up at the very rear of the MFP-3D | ||
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| - Engage the tip | - Engage the tip | ||
| * Set the I gain to 10 | * Set the I gain to 10 | ||
| - | * Make the 'Set Point Voltage' about 95% of the original amplitude | + | * Make the 'Set Point Voltage' about 95% of the target amplitude (1 V by default) |
| * Click 'engage' in the S&D meter and | * Click 'engage' in the S&D meter and | ||
| * Lower the tip (tripod thumbwheel — left = up, right = down) while watching the amplitude. The amplitude will drop as you near the surface. The computer will beep when feedback kicks in to stop the amplitude from dropping below the setpoint. Continue lowering until the Z voltage is in the middle of its range. | * Lower the tip (tripod thumbwheel — left = up, right = down) while watching the amplitude. The amplitude will drop as you near the surface. The computer will beep when feedback kicks in to stop the amplitude from dropping below the setpoint. Continue lowering until the Z voltage is in the middle of its range. | ||
| + | * If the Z-voltage goes down instead of up, re-tune. If that doesn't fix it, you might have junk stuck to the tip. | ||
| * Lower the 'Set Point Voltage' by about 10%. | * Lower the 'Set Point Voltage' by about 10%. | ||
| * Lower the tip until the 'Z voltage' approximately in the middle of its range. | * Lower the tip until the 'Z voltage' approximately in the middle of its range. | ||
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| - Manually retract tip from sample - Give the front thumbwheel a few clockwise twists | - Manually retract tip from sample - Give the front thumbwheel a few clockwise twists | ||
| - Turn off laser - Key on the AFM computer | - Turn off laser - Key on the AFM computer | ||
| - | - Turn off camera - Close camera window | ||
| - Turn off camera light - Switch on the box sitting on top of the AFM | - Turn off camera light - Switch on the box sitting on top of the AFM | ||
| - Place MFP-3D onto its shelf holder | - Place MFP-3D onto its shelf holder | ||
| - Remove sample | - Remove sample | ||
| + | - Close software and log out | ||
| - Leave controller and PC running unless expecting a power outage | - Leave controller and PC running unless expecting a power outage | ||
| ===== Imaging rules of thumb ===== | ===== Imaging rules of thumb ===== | ||
afm.txt · Last modified: 2023/09/18 12:01 by dublin
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