Epson 9840 Manual Do Utilizador

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SYSTEM CALIBRATION MODE 
The following procedure should be followed to calibrate the Model 9840 itself.  This 
calibration requires the use of a precision millivolt per volt reference which will be attached 
on the load cell connector.  The resulting scale factors are recorded in the non-volatile 
memory of the Model 9840. 
 
 
ATTENTION:  System Calibration should ONLY be performed by trained, QUALIFIED 
TECHNICIANS utilizing the proper precision devices to ensure the most accurate 
performance of the unit.  
 
 
1.  To enter system calibration mode, turn off the Model 9840.  Hold down the two end 
buttons ( “<“ and “>“ ) while turning power back on.  As soon as the display comes on 
you can release the buttons. 
2.  The unit will go through its regular start up sequence but rather than entering run 
mode and showing the load in pounds a password prompt will be displayed.  Enter the 
number 777 as the system calibration password. 
3.  The unit will now display “Unit mV / V Cal” to indicate that it is ready to be calibrated.  
A five minute warm-up period with the millivolt-per-volt reference attached is 
recommended at this time if the unit has just been turned on or the millivolt-per-volt 
reference has just been attached.
  Press any button to clear this display. 
4.  You are now prompted to enter the first of two millivolt per volt references.  (We 
recommend using -3.0 mv/volt for the first and +3.0 mv/volt for the second.)  Set your 
reference and enter the appropriate number.  As soon as you press Enter the Model 
9840 will start reading the reference. 
5.  Next you are prompted for the second mv/volt value.  Set your reference and enter the 
appropriate number.  Again reading will start as soon as Enter is pressed. 
6.  When the read is complete, the unit will display “Calibration Done”.  Pressing any 
button at this time will place the unit back into its normal run mode. 
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