3) Description 
①  KEY operation (selecting menu) 
            A. Esc: Overview 
-. Return to OVERVEW screen 
 
            B. F1: History Dump 
-. Go to screen that displays stored data on STRING GRID. 
 
            C. F2: PURGE 
-. Send PURGE signal to measuring instrument. To get the signal, setup data 
must be made in advance 
 
            D. F3: ZERO   
-. Send ZERO CALIBRATION signal to measuring instrument of relevant item. 
To get the signal, setup data must be made in advance 
 
            E. F4: SPAN   
-. Send SPAN CALIBRATION signal to measuring instrument of relevant item. 
To get the signal, setup data must be made in advance. 
 
            F. F5: RESET   
-  Complete the execution of F2, F3 
 
            G. F6: AUTO-CAL   
-  Execute Zero, Span, and Purge all over. 
CAL data are not transmitted to Environment Management Corporation.   
(¿ Use it for confirmation of D/L and measuring instrument configuration) 
 
            H. PgUp/PgDn: CH change 
-. Use when change items to monitor