Channels Parameters Tips

Optimizing the Data Type Parameters

• The system can display up to eight simultaneous Realtime images.
• The Data Type parameter does not switch the operating mode of the instrument, it simply changes the source of the data displayed.

Optimizing the Data Scale Parameters

• Data beyond the setting of the Data Scale is clipped for the RealTime display. Captured data, however, is not clipped. Independent of the settings of this parameter, the captured data will be correct unless it exceeds the maximum vertical range of the scanner.
• Each Data Type retains separate settings for Data Scale.
• Data Center is used to manually offset the trace data when Realtime Plane Fit is set to None.

The conversion of Volts to nm or nA, is dependent on the value of the parameters in the Calibrate > Detector panel.

For example, nanometers of cantilever deflection are calculated using the Sensitivity parameter in the Force Calibrate panel.

Optimizing Realtime Plane Fit Parameters

The setting of Realtime Plane Ffit only affects the displayed data. It does not affect the captured data The parameters are described below.

• None displays the raw data in the scope window.
• Offset applies a zero order correction to each line of data so that the average height of the line is centered in the scope display.
• Line applies a 1st order correction, removing both tilt and offset from each line of data.
• Bow—Centers data and removes the tilt and bow in each scan line, by calculating a second order, least-squares fit for the selected segment then subtracting it from the scan line.

Optimizing Offline Plane Fit Parameters

• The None option should only be used in special cases.
• The Offset and Full options provide greater dynamic range in the data to reduce round-off and other errors in subsequent calculations.

The offline (or NanoScope Analysis) Flatten and Plane Fit commands can also be used to level the data after it has been captured.

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