
Model 4200M:
Remove the rectangular access panel on the rear of the indicator by
removing the six hex head screws holding it in place. Locate S2 -
position 9 using figure 2. Move this switch to the closed position to
enter the setup menu.
Model 4200RSS:
Loosen the front cover latches and open the front cover. Locate S1
on the main board using figure 2. Flip S1 to enter the setup mode.
When the switch has been closed, the scale display will respond by showing the message
"AUG --". To enter the calibration mode, press the GROSS/NET button. The indicator will
flash "C" in the leftmost digit of the display and show the actual gross weight on the
platform.
READING RAW A/D PLATFORM DATA
The raw (internal) counts must be displayed in order to perform the analog zero and span
calibrations described below.
To display the raw (internal) counts, enter the calibration mode and press and hold the
PRINT button. The raw counts will be displayed as long as PRINT is held. The displayed
value will always be a positive value and in the range of 0 to 104000. If the value is above
or below the limits, then the value will remain at the limits. Additionally, while the PRINT
button is held, serial data representing the raw data will be transmitted from the simplex
(printer) port.
ANALOG ZERO CALIBRATION
The analog zero calibration is necessary because a dead load is always present on the
load cell due to the weight of the platter and any other weighing apparatus. This dead load
is compensated for electronically within the 4200, and switch settings are provided for
adjustment.
To check the analog calibration, make sure the weighing platform is properly set up, then
enter the calibration mode and display the raw counts as explained above. The reading
with no weight on the platter should be between 1000 and 10000. If the reading is outside
this range, adjust the zero potentiometer to try to bring it into range. If the zero pot does not
provide enough adjustment, change the switch settings using the chart on the following
page (zero up settings increase reading, zero down settings decrease reading).
Section 7 Calibration
47