Scope Loop Verification

Recommended: After completing the Current Loop Auto Tune, verify the tuning results using CME’s built in Scope tool.


Complete all steps on this page before proceeding to the next topic.


On this page

  1. Open the Scope
  2. Configure Scope
  3. Verify Measurement Channels
  4. Start Trace
  5. Observe Waveform


1.  Open the Scope

Click the Scope icon in the CME toolbar.

This tool allows you to record and visualize real time current, velocity, or position data from the amplifier, making it essential for validating the behavior of the motor after tuning.


2.  Configure the Scope for Tuning Check

After completing the Current Loop Auto Tune, use the CME Scope tool to verify the current control and motor response are behaving correctly.

The Scope allows you to apply a test waveform to the axis and observe the response in real time.

    1. Open Function Generator set up.
      This controls the excitation signal used for tuning verification.
    2. Set the following parameters:
      • Apply To: Position
      • Function: Square Wave
      • Amplitude: e.g., 10000 counts (adjust for your stroke range)
      • Frequency: e.g., 2 Hz

These settings command the motor to move back and forth, allowing you to observe how well the system follows the target.


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3. Verify Measurement Channels (Center Section Settings Tab)

In the center of the screen, under the Settings tab, confirm the correct signals are assigned to the display channels:

    • Ch 1: Commanded Position (Axis C)
    • Ch 2: Active Load Position (Axis C)
    • Remaining channels can stay Disabled

This ensures the Scope displays a clear comparison between:

    • Pink = Commanded (target) motion
    • Blue = Actual motion of the linear motor


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4. Start the Trace

Once parameters are confirmed:

    • Press Start in the Function Generator pane
    • The motor begins moving according to the square‑wave pattern
    • The Scope displays live waveform data as the motion occurs

As the trace runs, the system shows the real time feedback of the motor position relative to the commanded signal.

5. Observe the Waveform

When the trace begins, the graph at the top of the window shows:

    • Pink (Commanded Position): Sharp transitions from high to low
    • Blue (Actual Position): Real motor motion following the command

A well tuned system should show:

    • Minimal overshoot
    • Minimal steady‑state error
    • Smooth following motion
    • No excessive oscillation or ringing

If the actual response deviates significantly, additional tuning (P Loop or V Loop) may be needed.


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