I N T E R F AC E M O D E L 9 8 4 0
MO D E L 9 8 4 0 P G 5 4
P U B .
6 0 3 2 - 0 1
SYSTEM CALIBRATION MODE
The following procedure should be followed to calibrate the Model 9840 itself. This
calibration requires the use of a precision milli-volt 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, go to the Main Menu. Using the num pad on the
right, enter the password “777”.
2. The unit will now enter a sub menu where you can select to calibrate an individual
channel or all four at once. At this point, it is ready to be calibrated.
A two hour warm-
up period with the milli-volt per Volt reference attached is recommended at this time if
the unit has just been turned on or the milli-volt per Volt reference has just been
attached.
Press any button to clear this display.
3. After selecting an option, you are now prompted to enter the first of three milli-volt per
Volt references. (We recommend using -3.0 milli-volt per Volt for the first and +3.0
milli-volt per Volt for the second. It requires 0.0 milli-volt per Volt for the third point.)
Set your reference and enter the appropriate number. As soon as you press “Enter”
the Model 9840 will start reading the reference.
4. Next you are prompted for the second milli-volt per Volt value. Set your reference and
enter the appropriate number. Again reading will start as soon as Enter is pressed.
5. When the read is complete, the unit will display the scale factors it generated.
Pressing the cancel button at this time will place the unit back to the main menu, and
pressing the back button will return you to the system calibration mode menu.
