# The Limits Tab

Select the required option from the Specification limits group box.

- Both Sided – Parameter considers both LSL and USL. Both must be entered and USL should be always greater than or equal to LSL

- Lower – This option is disabled.

- Upper – Parameter considers only USL. LSL cannot be entered. It is set to 0.

Select the required option from the Control limits group box.

- Calculate – The control limits are calculated by the system.

- Specify – You want to specify the control limits.

If you select the Calculate option, then you must also select the appropriate option from Initial Calculation Of Control Limits group box.

- Use LSL and USL – The Specification Limits are considered as the initial control limits.

- Calculate using 75% of nominal difference – The control limits are calculated on the basis of 75% of the Nominal Difference. Please also refer to the Formula used for calculation of control limits.

UCLx, LCLx, LCLr and UCLr are calculated automatically depending upon the specified calculation methods.

You may enter the No. of samples for limit calculation. If number of samples for limit calculation entered is greater than 0 and you want the control limits to be calculated repeatedly then you must check in the Repeated Calculation edit box. You may enter the Nominal Value and the Setting Value. Nominal value should be between LSL and USL. In case Lower option has been selected, Nominal value should be greater than or equal to LSL. In case Upper option has been selected, Nominal value should be less than or equal to USL.