MTS Acumen - Manual (Page 162)

3. Click Next.
4. In the Mass box, enter the unit of measurement and fixture mass for which you want to compensate
the effects of acceleration. In the Fine Adjustment box, enter the unit of time and value for the delay
between the acceleration (compensating) signal and force feedback. In the Polarity box, select Normal
or Invert.
The Fine Adjustment control sets a relative delay between the acceleration signal and the force signal
before they are added together. You can enter this delay as a positive or negative value. The delay
determines the phase matching between the force and acceleration signals, which provides acceleration
compensation.
5. Click Apply.
6. Click Done to save the compensation set and not verify it. To verify your values, click Verify and
continue to the next step.
7. Enter values under Define Command to create a program that will generate load feedback upon which
the application applies compensation (based on the value you entered for Mass). The verification
program always runs in stable displacement control mode.
Recommended :
Enter command parameters for the verification program that approximates your anticipated
test parameters.
8. Prepare the system to run the verification program. This may involve clearing interlocks, applying power,
and so on. The system is ready when you see a green check mark in the box with the text, “System is
ready to compensate.” If the system is not ready, hover your cursor over the icon to see information
about the error.
9. Click the green run button to apply the verification program, and click the Scope tab to observe the
results (load feedback in response to the command).
10. When the verification program is complete, the Acceleration Compensation Quality graph will show
results. The best result is when the indicator is in the green on the far right.
11. If you are satisfied with the results, click Done and save the compensation set. If you are not satisfied
with the results, click Adjust, and continue with the next step.
12. Adjust the values under Define Command, and when the system is ready to compensate, click the
green run button, and observe the Scope results (load feedback in response to the command).
13. While the verification program is running, you can adjust the Define Command, Mass, Fine Adjustment,
and Polarity controls and observe the effect on the load feedback signal.
14. When you have optimized compensation results as desired, click Done.
Do Not Use Compensation
This procedure prevents compensation from being applied to force input signals. This selection is appropriate
for static or very-low frequency tests that do not generate unwanted feedback resulting from fixturing and
force transducer motion.
1. Click Compensate for Fixturing on the Explorer tab.
2. Select Do Not Compensate.
162 | MTS Acumen ™
Best Practices for Other System Configurations and Tests