19
analog-to-digital converter data being
inputted to the microprocessor.
6. Press the “Print/Send/Data” pushbutton one
more time. The number displayed is now the
“raw” analog to digital data. Each “count” of
the display is equivalent to 1 gram.
7. The automatic turn-off timer has also been
programmed for an extended “on” period to
give you time to calibrate the scale. This time
period is three minutes. The scale may be
turned off before this time period by simply
pressing and holding the “ON / (OFF) /
ZERO” pushbutton. Hold it in for several
seconds until the power shuts off. If
additional time is needed to complete the
calibration procedure, press the “ON / (OFF)
/ ZERO” pushbutton briefly. This will reset
the timer for an additional three minutes. If
the scale is operated from AC line power, it
will normally remain on continuously.
The readout is now displaying a number, which
represents the zero offset value of the platform and
load cell transducers, in kilograms (0.001 kilogram =
1 gram).
4.43 CALIBRATION PROCEDURE
1. Momentarily press the “ON / (OFF) / ZERO”
pushbutton to reset the internal self-test
timer. Reattach the scale’s cradle. Note the
currently displayed weight reading on the
front display. Record this zero offset reading.
2. Lay the two (2) 10-kilogram test weights
side-by-side in the center of the cradle. Note
the new number displayed. Subtract the
original zero offset value from this new
number to obtain the scale’s displayed value
of the calibration weight.
Example: The zero offset value is +-1.230 KILOS”
(representing -1.230 kilograms). Adding the specified
two 10 kilogram test weights (equivalent to 20.000
kilograms) to the cradle produces a reading of
“18.763 KILOS”. The different is 18.763 – (-1.230) =
19.993 (equivalent to 19.993 kilograms). This would
indicate the calibration is 20.000 – 19.993 = 0.007
kilograms “low”.
Using the specified two 10 kilogram test weights a
difference of 20.000 kilograms +/-0.003 kilograms (3
grams) should be obtained. J If necessary adjust
potentiometer P1 (span adj.) on the instrument board
until the correct value is obtained.
If the display shows “Ad our” (A/D over range), try
repeating the process with a single 10 kilogram
weight until the calibration becomes close; the
calibration can then be “fine-tuned” with both 10
kilogram weights.
(If using weights other than the two specified 10
kilograms, make the necessary adjustments to the
calibration procedure.)
3. Momentarily press the “ON / (OFF) / ZERO”
pushbutton to reset the internal self-test
timer. Remove the test weight and recheck
the zero offset value. Note that adjusting P1
SPAN may also alter the zero offset value.
Repeat the process as necessary to obtain
the correct difference.
4. Now you may turn the scale off by pressing
the “ON / (OFF) / ZERO” pushbutton and
holding it in for few seconds. That will force it
to turn off. Reattach the top cover of the
enclosure using an allen wrench and the
eight (8) #10 button head screws. Replace
the cradle. The scale may now be checked
for normal operation with the test weights.
4.50 FACTORY SERVICE HELP
If service information is to be obtained by calling the
factory, the serial number and model number of the
scale must be communicated at the beginning of the
call to allow our service staff to quickly access the
manufacturing records, calibration data, service
records and other pertinent information concerning
that particular scale. (These numbers can be found
on the data label attached to the rear of the
enclosure.)
NOTE: IN ALL CASES, CALL THE FACTORY
BEFORE RETURNING ANY PARTS OR SCALES
FOR REPAIRS. MOST PROBLEMS CAN BE
DIAGNOSED AND SOLVED OVER THE PHONE
BY RUNNING A FEW TESTS.
IT IS ALWAYS NECESSARY TO CONTACT THE
FACTORY FOR A RETURN AUTHORIZATION
NUMBER, SHIPPING INSTRUCTIONS AND
ADDRESS. CALL 630-653-3377 or 800-879-2001.
DO NOT SHIP SCALE TO THE NEW YORK
FACILITY!
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