Scientech 10K Series - Manual (Page 9)

Autocalibration – To Calibrate the Balance and its Motorized Internal Calibration
Weight to an External Weight:
This procedure is only for SA and SM balances with an optional 9000-INT motorized internal calibration weight installed. This
procedure first calibrates the balance to an external calibration weight then recalibrates the internal calibration weight to the external
weight. This procedure can also be used to only calibrate the balance to the external weight without recalibrating the internal
calibration weight.
Note: Dual range models must be placed in HI range before starting the calibration procedure.
Note: For correct calibration weight refer to specification charts in the back of the manual.
Note: The balance should be warmed up for at least one (1) hour prior to calibration and leveled according to the
Unpacking and Setup section.
Note: Perform autocalibration every time you move your balance.
Calibrate the balance using a recently certified external calibration weight. Metrology handbooks state that the calibration weight
utilized to calibrate a balance should have a tolerance no larger than the readability of the balance divided by 3. Therefore, SM
models need a ±0.0033mg tolerance weight or better, SA models need a ±0.033mg tolerance weight or better.
User Action Balance Response
1 Remove any containers or weighing samples
so that nothing is on the weighing pan, then
press the ZERO button
Zeros are displayed
2 Press the RANGE/FUNCTION button (or
MODE and RANGE buttons simultaneously
for dual range balance models)
Balance display cycles repeatedly through PCS, HI OK LO, CAL 1, CAL 2,
T and %.
3 Press the MODE button when CAL 1 appears CAL 1 and a flashing 0 are displayed.
4 Wait 10 seconds for the balance to stabilize,
then press the ZERO button.
The display stops flashing and a solid ) is displayed. In approximately 15
seconds, when this step is complete, a single weight or two alternating
weights will begin flashing on the display.
5 Place on of the flashing weights on the
balance’s weighing pan.
The display stops flashing and the selected weight is displayed.
6 Wait 10 seconds for the balance to stabilize,
then press the ZERO button.
The display will momentarily blink, then the selected weight will continue to be
displayed. In approximately 15 seconds, when this step is complete, the display
will blank, flash “OK”, then shows CAL 1 and a flashing 0.
7 To continue and recalibrate the internal
calibration weight, proceed to step 8.
To stop here without calibrating the internal
calibration weight, remove the calibration
weight from the weighing pan and press the
MODE button..
The balance has been calibrated and the display returns to zeros.
8 Remove the calibration weight from the
weighing pan, then press the ZERO button.
The display shows a flashing CAL and the internal weight recalibration begins.
You will hear the internal motor and see the capacity tracker fill and then
empty. The procedure will take about 30 to 90 seconds. When complete, the
display will blank and then return to its normal weighing mode. The balance is
now calibrated to the external weight and the internal weight is calibrated to the
external calibration weight.
RS-232 Command for CAL 1 Using the Internal Weight:
To initiate a CAL 1 using the motor driven internal calibration weight via a RS-232 command, issue the command ACAL[CR]. The
automatic internal weight calibration will begin immediately without further user interaction. For a more complete discussion about
RS-232, please see the Bi-directional RS-232 Command Set section.
(CAL 2) Linearity:
Linearity is set in the balance’s software at the factory during the manufacturing process. It requires a special set of weights that are
not available commercially. When a CAL 1 function is performed the linearity is automatically reset as well. Unless the balance is
damaged the linearity will not change. Therefore, CAL 2 should never be performed by the user.
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