如何在TeeChart上为javascript设置放大倍数？

we are trying to set zoom-in max for x axis with date format. For example after the last zoom-in the time distance between tick labels should be 20 seconds (15:33:40 15:34:00 15:34:20 15:34:40 15:35:00). For zoom we are using to set min/max from button.we are trying to set zoom-in max for x axis wit