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Dimension TM 3100 Manual Version 4.43B phần 7

Để giảm thiểu hoặc tính toán các lực lượng liên lạc giữa đầu và mẫu, để có được một đường cong lực lượng tốt, tuy nhiên, sẽ có tình huống mà bạn sẽ không có được một đường cong lực tốt không có vấn đề bao nhiêu bạn điều chỉnh kích thước Ramp, Z quét bắt đầu và điểm đặt. Những phần sau thảo luận về một số tình huống như vậy. | Force Imaging Obtaining a Good Force Curve continued. 6H.UBAdjusted Force Curve for 90 ụm Scanner Retracting ---- Extending 13.5.2 Helpful Suggestions To minimize or calculate the contact force between the tip and sample it is important to obtain a good force curve however there will be situations where you will not obtain a good force curve no matter how much you adjust the nmnrran H llllllilllllllIÌ nd IIIIIIIIIIII I The following sections discuss a few such situations. Suggestions on working in 6IIIIIIIII Iiirwiniiiiiirimode are included. 61 Iiiiiiiiiinnnnrri Figure 13.5e illustrates a force curve resulting from a falsely engaged tip. The photodiode receives light reflected off the sample causing an increase in the deflection signal until the signal equals the setpoint and the system engages even though the tip is not on the surface . Interference in the reflected light causes the hump-shaped waveform. Although you can use the I IIIllII i Ibutton to move the tip down to the surface the easiest way to correct a false engagement is to withdraw the tip adjust the photodetector positioner to make the top bottom differential voltage more negative then re-engage the tip. This has the effect of pushing the cantilever farther up before the Setpoint is reached. 13-22 Dimension 3100 Manual Rev. B Force Imaging Obtaining a Good Force Curve continued. 6H.UBAdjusted Force Curve for 90 ụm Scanner Retracting ---- Extending 13.5.2 Helpful Suggestions To minimize or calculate the contact force between the tip and sample it is important to obtain a good force curve however there will be situations where you will not obtain a good force curve no matter how much you adjust the nmnrran H llllllilllllllIÌ nd IIIIIIIIIIII I The following sections discuss a few such situations. Suggestions on working in 6IIIIIIIII Iiirwiniiiiiirimode are included. 61 Iiiiiiiiiinnnnrri Figure 13.5e illustrates a force curve resulting from a falsely engaged tip. The photodiode receives light reflected .