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High Speed Data Capture

The High Speed Data Capture window, shown below, allows you to capture and store many signals. To open the High Speed Data Capture window, click Capture > High Speed Data Capture.

Note: The High Speed Data Capture function is not available on all microscopes, e.g. the Dimension Icon-PI, supported by NanoScope version 8 software.

Channel Selection Panel

Channels A and B can capture data at 6.25 MHz and 50 MHz while channels C and D capture data at 500 kHz. Channels A and B capture Vertical and Lateral Deflection respectively. Data capture of those channels may also be turned Off.

Table 1shows the available data types are available for capture.

Channel Data Type Frequency
A and B

Vertical Deflection

Lateral Deflection

6.25 MHz

50 MHz
C and D

Height

Signal Sum

X sensor

Y sensor

Z sensor

Amplitude

Phase

TM Deflection

Deflection Error

Friction

Z Feedback Output

Input 1

Input 2

Input 3

X Scan

Y scan

 500 kHz

Table 1: Channel Data Types

Trigger Controls Panel

Trigger Control Description
Arm Trigger

Arm Trigger begins monitoring for the trigger conditions to be met and starts data acquisition into the FIFO buffer.

This button toggles to Disarm Trigger when the trigger is armed.
Disarm Trigger Disarm Trigger stops data acquisition and stops monitoring for a trigger event.
Auto Re-Arm The Auto Re-Arm check box causes the trigger to be re-armed after the data acquisition is completed. If Auto Re-Arm is not checked, the trigger will be disarmed after the data acquisition has been completed.

Force Trigger

The Force Trigger button triggers data collection.

Event

The trigger Event drop-box allows you to trigger on an Edge, EOL (End of Line), EOF (End of Frame) or None. When the trigger is armed and a trigger Event occurs (or, if the trigger is forced), an Abort box, shown in Figure 1, giving you the ability to abort the data acquisition appears.

Note: If Event = None, you must Force Trigger to begin data acquisition.

Figure 1: Abort box

Channel

The Channel drop-box allows the following data types to be used as a trigger:

  • Signal Sum
  • X sensor
  • Y sensor
  • Z sensor
  • Deflection Error
  • Friction
  • Z Feedback
  • Output
  • Input 1
  • Input 2
  • Input 3
  • X Scan
  • Y Scan

Level

Select the trigger Level at which you wish to begin acquiring data.

Slope

You may trigger on either a Positive or Negative Slope.

Delay

Trigger Delay, if Positive, specifies the amount of time between when the trigger conditions are met and when data capture begins. If Negative, Delay specifies the amount before the trigger conditions are met that data capture begins.

Duration

The time Duration of data that is saved.

Table 2: Trigger Controls Panel

Status Panel

The high speed data capture status is displayed in the status panel at the bottom of the HSDC window. Captured file names have a suffix of .hsdc

Point And Shoot

The High Speed Data Capture (HSDC) function in the Point and Shoot view, shown in Figure 2, allows you to mark a spot for data collection. This can be operated in two modes:

  1. While Scanning: triggers a capture when the tip passes the marker point.
  2. While Scan Idle: stops the scan, moves to the marked point and captures data there.

In either mode, you must set the capture conditions in the High Speed Data Capture window before acquiring data.

Force Trigger: forces a trigger at the marked point regardless of the preset trigger conditions.

Figure 2: Point and Shoot - High Speed Data Capture

 

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