- Access the SCM Tune Generic Sweep mode by clicking the SCM Tune icon in the Workflow Toolbar.
Figure 1: SCM Tune: Generic Sweep Window, Tip Withdrawn
- Several control panels display in the SCM Tune window: Sweep, Channel 1, 2, and Graph (see Figure 1). The Graph controls sub-panel parameters are described in Table 2.
| Parameter | Use with SCM |
|---|---|
| Sweep Output |
Select an SCM parameter to sweep, from:
NOTE: You may also select Sweep Output by clicking More > AC Bias Amplitude, Bias Frequency, Capacitance Sensor Frequency or SCM Lock-In Phase.
|
| Sweep Width | Sets the sweep range. |
| Sweep Center | Sets the midpoint of the sweep. |
| Sweep Samples | Sets the number of data points included in a sweep. Available in Expanded Mode. |
| Units | Volts or Metric. Available in Expanded Mode. |
| Pause Between Steps | Set the amount of time (in µs) between steps in a sweep. Available in Expanded Mode. |
Table 2: SCM: Graph control parameters in Sweep Generic Mode
| Parameter | Description |
|---|---|
| Integral Gain | Controls the amount of integrated error signal used in the feedback calculation. |
| Proportional Gain | Controls the amount of the proportional error signal used in the feedback calculation. |
| Deflection Setpoint | Setpoint for engaging contact mode. |
| Z Limit | Redefines the range of deflection values to change the resolution. |
| LP Deflection BW | Sets the bandwidth of the low pass deflection filter. |
| LP Friction BW | Sets the bandwidth of the low pass filter in the friction channel. |
| AC Bias Amplitude | Amplitude of the AC bias applied to the sample. |
| Bias Frequency | Frequency of the AC bias applied to sample. |
| SCM Amplitude Limit | |
| SCM Lock-In BW | Bandwidth of the auxiliary lock-in (used for capacitance). |
| SCM Lock-In Phase | Phase of the SCM lock-in amplifier with respect to the reference bias frequency. |
| DC Bias | DC bias applied to the sample. |
| Capacitance Sensor Frequency | Frequency of capacitance sensor. |
| SCM Igain | Igain used for closed-loop mode. |
| SCM Pgain | Pgain used for closed-loop mode. |
| Feedback Setpoint | Not used in open loop mode. Selects the dC/dV setpoint in closed-loop mode. |
| Feedback Limit | Limits the bias amplitude in closed-loop mode. |
Table 3: SCM: Sweep parameters in Generic Sweep Mode
- Select the parameter to sweep in Graph > Sweep Output. You may also select from several Sweep Output choices by clicking More, shown in Figure 1. Adjust Sweep Width, Sweep Samples and the Sweep parameters to desired values.
- Adjust Data Type in Channel 1 or 2 panels to display the desired property.
NOTE: Sweeping starts when the Sweep Generic Mode is entered and continues until you exit.