4. CALIBRATION4.1 SYSTEM-CORRECTIONBefore you can do any measurement, the USB box will be tested and a correction file will begenerated. In the System-correction, a correction curve will be generated for the input andoutput of the ATB 805 box.The box is set to CALIBRATION. For the function Calibration and impedance the volume isdisabled.The System-correction menu is called up with a click on the button inthe main menu.18