Differences

This shows you the differences between two versions of the page.

--- afm [2022/07/13 13:21] – dublin
+++ afm [2025/02/09 13:46] (current) – ethanminot
@@ Line 5: / Line 5: @@
   *//See also: [[AFM upkeep]]//
-New users on the AFM are expected to get AFM training and then pass the {{::afm_training_quiz5.doc|AFM quiz}}.
+New users of the AFM are expected to get AFM training and then pass the {{::afm_training_quiz5.doc|AFM quiz}}.
 To find answers to some of the quiz questions, the "AFM Manualette" is a useful resource.
   *T:drive/Minot Group/Group documents/Manuals and documentation/AFM/MFP-3D Manualette_v9.pdf
@@ Line 65: / Line 65: @@
   - 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.
-  - 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
   - 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
     * Align camera on cantilever - Two knobs sticking up at the very rear of the  MFP-3D
@@ Line 78: / Line 78: @@
   - X Set AC Mode - In main tab of the master panel select 'AC Mode' in the 'Imaging Mode' pull down menu
   - Tune the AFM
-    * X Open 'Tune' tab in the master panel
+    *  Open 'Tune' tab in the master panel
-    * X Set 'Target %' to -5.0 % (this setting favors repulsive mode imaging, often recommended for beginners)
+    *  Set 'Target %' to -5.0 % (this setting favors repulsive mode imaging, often recommended for beginners)
     * Click the 'Auto Tune' button and wait for tuning to finish. Software will set drive frequency.
   - Engage the tip
-    * X 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
-    * Lower the tip (tripod thumbwheel) 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 tip until the 'Z voltage' approximately in the middle of its range.
@@ Line 100: / Line 101: @@
   - Manually retract tip from sample - Give the front thumbwheel a few clockwise twists
   - 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
   - Place MFP-3D onto its shelf holder
   - Remove sample
+  - Close software and log out
   - Leave controller and PC running unless expecting a power outage
 ===== Imaging rules of thumb =====
@@ Line 110: / Line 111: @@
 **Beginner settings**
   *Scan size 1 micron
-  *Scan rate 1 Hz
+  *Scan rate < 15 micron / s
   *Integral gain 10
   *Free amplitude 1 V (~ 100 nm)