Mode Panel

Control	Description
Trigger mode	Limits the amount of force exerted by the tip upon the sample. It is possible to operate the trigger independent of drift (Relative) or at some arbitrarily fixed point (Absolute) depending on the trigger settings.
Data Type	Channels may be assigned for triggering to any input signal available including: Deflection, Amplitude, Phase or Friction data.
Trig threshold	The value of the cantilever deflection, as measured by the photodetector, desired for the indentation or scratch. The Trigger threshold defines the maximum force applied to the sample corresponding to the upper right-most point on the force plot. Range or Settings: –10 V to +10 V, depending on the Deflection Limit. Try 0.5 V to 1.0 V
Trig direction	Determines the direction of the trigger and allows for a Positive, Negative, or Absolute trigger slope. In this way, the trigger may be configured to activate on either the positive or negative direction of the force curve. See Figure 1.
Start Mode	Start mode allows you to switch between the various force modes without returning to image mode. Range or Settings: Calibrate—Produces standard force plots. Includes the ability to continuously cycle the tip up and down. Step—Produces standard force plots, with added control to step the tip towards the surface. Motor step—Tip is stepped towards surface using the motor. Indent—Starts optional nanoindentation mode. Available only in TappingMode.
End Mode	Determines the location of the tip when the microscope is returned to Image mode. Range or Settings: Extended Retracted Surface
Z Step Size	The change in tip height per step when using force step.
Auto Start	Range or Settings: Enabled— Starts ramping when entering from Image mode. Disabled— You must start ramping by clicking the Continuous or Single icon, or by selecting the proper menu selection under the Ramp menu.
Surface delay	Specifies a delay when the tip reaches the point closest to the sample. Range or Settings: 0 to 3600 seconds
Retracted delay	Similar to Surface delay, this value specifies the duration of the delay when the piezo is at the top of the cycle (farthest away from the sample). Range or Settings: 0 to 3600 seconds
Strip Chart Rate	Frequency of (Z-position, deflection) data point acquisition for strip chart. Range: 0.01 Hz to 1 kHz. Typical value: 100 Hz.
Strip Chart Size	Time interval over which (Z-position, deflection) data points are displayed in the strip chart. Range: 10 to 360,000,000 sec. Typical value: 100 sec. NOTE: Although the strip chart collects and displays data over the time interval defined by clicking Start, then later, Stop, this data is not saved for subsequent use until the Capture icon is clicked. If Capture is clicked while strip chart data is being taken, what is saved begins at the start of the chart (sooner than the icon is clicked).

Control

Description

Trigger mode

Limits the amount of force exerted by the tip upon the sample. It is possible to operate the trigger independent of drift (Relative) or at some arbitrarily fixed point (Absolute) depending on the trigger settings.

Data Type

Channels may be assigned for triggering to any input signal available including: Deflection, Amplitude, Phase or Friction data.

Trig threshold

The value of the cantilever deflection, as measured by the photodetector, desired for the indentation or scratch. The Trigger threshold defines the maximum force applied to the sample corresponding to the upper right-most point on the force plot.

Range or Settings:

–10 V to +10 V, depending on the Deflection Limit. Try 0.5 V to 1.0 V

Trig direction

Determines the direction of the trigger and allows for a Positive, Negative, or Absolute trigger slope. In this way, the trigger may be configured to activate on either the positive or negative direction of the force curve. See Figure 1.

Start Mode

Start mode allows you to switch between the various force modes without returning to image mode.

Range or Settings:

Calibrate—Produces standard force plots. Includes the ability to continuously cycle the tip up and down.
Step—Produces standard force plots, with added control to step the tip towards the surface.
Motor step—Tip is stepped towards surface using the motor.
Indent—Starts optional nanoindentation mode. Available only in TappingMode.

End Mode

Determines the location of the tip when the microscope is returned to Image mode.

Range or Settings:

Extended
Retracted
Surface

Z Step Size

The change in tip height per step when using force step.

Auto Start

Range or Settings:

Enabled— Starts ramping when entering from Image mode.
Disabled— You must start ramping by clicking the Continuous or Single icon, or by selecting the proper menu selection under the Ramp menu.

Surface delay

Specifies a delay when the tip reaches the point closest to the sample.

Range or Settings:

0 to 3600 seconds

Retracted delay

Similar to Surface delay, this value specifies the duration of the delay when the piezo is at the top of the cycle (farthest away from the sample).

Range or Settings:

0 to 3600 seconds

Strip Chart Rate

Frequency of (Z-position, deflection) data point acquisition for strip chart.

Range:

0.01 Hz to 1 kHz. Typical value: 100 Hz.

Strip Chart Size

Time interval over which (Z-position, deflection) data points are displayed in the strip chart.

Range:

10 to 360,000,000 sec.
Typical value: 100 sec.

NOTE: Although the strip chart collects and displays data over the time interval defined by clicking Start, then later, Stop, this data is not saved for subsequent use until the Capture icon is clicked. If Capture is clicked while strip chart data is being taken, what is saved begins at the start of the chart (sooner than the icon is clicked).

Figure 1: Trigger Direction

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