4 Operating princi ple4.1 KeyboardTurn on the instrument, three modes of operating are available. These modes are accessible with 1, 2 and 3 keys. 5 keyallows to go to reading settings or data transfer screens. 4 key is used to back to start screen from any mode.During measurement, 4 key also allows to leave the current screen.① ② ③ Function keys: they are directly linked to texts of the LCD screen situated atthe top and allow to choose the measurement mode and setting.④ Exit key: allows to leave current screen⑤ Screen key: allows to go to others different screens from measurement screens⑥ Start/stop keyImportant note: 1 -2 -3 keys are representative of the text or logo situated on the top in thescreen, which means :: the measurement is in progress: the measurement is finished or will be launched4.2 ScreenThree screens represent the different measurement and calibration modes et accessible with 1, 2 and 3 keys.Pressing 5 key shows the screen for the choice of the different available settings. Move the cursor with « Arrows » buttonsthen validate with the 3 key.7Analyser dosimeter-exposimeter with storageClassical sound level meterand frequency analyzer Calibrationmin. 73.4max. 115.7Raz85,2dBALCpk : 115.7 dBLAFV1 dB V2LCpk100.6 115.8LAeq, DI90.6 95.8LCeq,DI96.8 102.500 / 00 : 00 : 00400,5sA C 63 250 1k 4k140120100080060040LXeq :103.8dB125Ref :Cr.Cl : 0.0V1 V2-0.3 0.094.0dBCalibration