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 2 1
P U B .
6 0 3 2 - 0 1
CALIBRATION MODE
This menu is used to access all methods of calibration that are supported by the Model
9840. Selecting Calibration Mode from the Main Menu Screen will bring up a password
entry Screen for the left screen (see above) and an alphanumeric keyboard for the right
screen. Successful key in of the password (888) followed by either of the
Enter
buttons
will bring up a sub-menu which offers a calibration check for one channel at a time, and
various cell calibration options to select from. No matter which calibration style is
selected, all calibrations will start with the same basic question before diverting to its
unique calibration process. These common setting include, in this order: channel, cell
type, serial number (manually entered by user), current month, day and year, excitation
level (5.0V or 10.0V), unit and lastly the rated load of the cell.
If you are re-calibrating a cell, the Model 9840 will recognize it using either the AutoID or
a manually entered serial number. Any time you overwrite existing cell calibration data
you will first be warned with the “Overwrite Data?” message. Pressing enter will proceed
with the overwrite; pressing
Back
will undo the serial number entry and prompt the user
for a serial number again. Pressing either
Cancel
button with exit you entirely from the
calibration menu back to the Main Menu Screen. Both the
Back
and
Cancel
button will
abort the calibration process ad no data will have been saved. Another method of
overwriting existing data is to delete the sensor first in the Setup – Sensor Select menu,
and then perform a new calibration under the same sensor serial number.
If a cell with a new serial number (or new AutoID) is calibrated the data is added as a new
entry in the cell list.
Cells should be calibrated on the channel of which they are intended to be used on, but
that does not prevent a user, if they so choose, from selecting a sensor calibrated on
channel A and using it on channel D, for example.
If TEDS
OPT
is enabled and a TEDS
OPT
sensor is plugged into a channel, the user will not
be allowed to calibrate that channel.
Note:
All calibrations can be performed using positive or negative values! For multipoint
calibrations this will allow for nonlinear calibrations across zero. The sign of a number is
changed by pressing the “
-
” button during number entry.
>>Cal Check
Selecting this item will run a calibration check on the cell attached to the selected
channel. The Model 9840 will measure the shunt value of the cell and compare it to
the shunt value that was recorded when the cell was last calibrated. It is important to
ensure that for this check to be accurate on all non AutoID and TEDS
OPT
enabled
devices, the same cell that was used to perform the calibration matches the cell serial
number assigned to the channel being checked. After the check is complete, the rated
load or torque and last calibration date for the cell are displayed followed by the
currently measured shunt value and the shunt value that was recorded when the cell
was calibrated.
Note that the Model 9840 has a switch on the back panel that allows you to select
either a 30K shunt or a 60K shunt. Be sure that this switch is set correctly for the cell
that you are using.
