Relate the Output Filter to Natural Frequency
Use the system natural frequency as the starting reference for the Output Filter. If the system oscillates at 10 Hz, begin with an Output Filter value of 10 or higher. This example establishes a tuning starting point, not a universal final setting.
Read Natural Frequency from the Tuning Wizard
- Run the tuning wizard until it obtains the response plots and calculates the system model.
- Click Advanced.
- Select Allow second order.
- Read the Natural Frequency value from the calculated model parameters.
- Clear Allow second order before continuing unless the application requires a second-order model.
Use the displayed Natural Frequency as the reference when selecting the initial Output Filter value.
Decide Whether to Retain a Second-Order Model
| Mechanical behavior | Model decision |
|---|---|
| The medium between the applied force and measurement location acts like a spring | A second-order model may be necessary. |
| No evidence of spring-like behavior | Use second-order modeling only to expose the Natural Frequency parameter, then clear the option before continuing. |
A second-order model can be used at any time, but the available guidance recommends retaining it only when necessary. Keep model selection separate from filter selection: enabling the model temporarily reveals the calculated natural frequency, while the mechanical behavior determines whether the model should remain enabled.
Verify the Filter Starting Point
Confirm that the tuning wizard completed its plots and model calculation before using the Natural Frequency value. Set the Output Filter close to that value; when applying the cited 10 Hz oscillation example, start at 10 or higher. Then verify that the selected model option matches the mechanics and that Allow second order is cleared when spring-like behavior does not justify it.
FAQ
How do I find the natural frequency for an Output Filter?
Run the tuning wizard through plot acquisition and model calculation, open Advanced, select Allow second order, and read the Natural Frequency from the model parameters.
What Output Filter value should I use for a 10 Hz oscillation?
Use 10 or higher as the starting value, then verify the result on the actual system.
When should I use a second-order model?
Retain it when the medium between the applied force and measurement location acts like a spring. Otherwise, clear Allow second order after reading the Natural Frequency.