6.1.5 Using Deflection Compensation Deflection compensation is especially useful when operating your MMD Series in Height mode and in applications where the measured height of the sample is critical. Deflection compensation effectively compensates for the deflection in the MMD Series and the components used in the load string: load cell sensor, clevis adapters, and test fixture. For best results, you should perform deflection compensation using the accessories for your sample. In addition, you should know the applied load that is being used with your sample. For example, if you are testing a spring, you should know what the load at your desired distance is prior to using deflection compensation. Use this load as your load setpoint. CAUTION Deflection compensation involves the compression of the load string onto a solid surface. Extreme care should be used so as not to overload the load cell sensor during your manual control of the crosshead.
Instruction Guidelines: 1. Place the MMD Series into Height mode. 2. Affix the load cell sensor and test fixture (platens) that will be used in your testing. 3. Set the datum using the automatic datum function in your Lx Series software. 4. Once the datum is established, place a solid hard object that is parallel to the top platen that is connected to the load cell. 5. Place the MMD Series is slow speed mode: Using L3 or L2 Plus Series software, select the speed icon and set to slow speed. Using L2 Series software, select the arrows on the tablet and set to slow speed. 6. Zero both the Load (L) and Distance (D) on the controller view (L3) or the tablet (L2). 7. USE EXTREME CAUTION- using the down jog key, slowly lower the crosshead observing the applied load. Move the crosshead downward until you reach the desired load on which to compensate for deflection. Stop immediately once your controller or tablet indicate this setpoint load value. 8. Record the applied Load value (L) and the Distance value (D). 9. Go to Settings - Corrections. Enter the Load value (L) into the DEFLECTION FORCE field. Enter the Distance value (D) into the DEFLECTION DISTANCE field. 10. Select DONE.
Activate Deflection Compensation by selecting YES.
46
Made with FlippingBook - professional solution for displaying marketing and sales documents online