LW Measurements MCT 66 - Manual (Page 25)

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place the calibration weight on the platter. Press ZERO to calibrate.
Once the stable indicator light is displayed, press the ZERO key again.
The second line of display will now show 00000. Calibration is now
complete.
NOTE: The ideal calibration test weight is between 2/3 capacity to full
capacity in order to get the most accurate weight after calibration.

Turn off the power, then turn it back on again. Place a weight on the
platter to ensure weighing is correct. If not, repeat the above steps.
Linearity calibration (for scale technician or factory use):

Turn on the weighing machine and then turn it off.

Press and hold the TARE key and then turn on the machine. The
display will show LINE on the first row, CAL-0 (flashing) on the second
line and AD value on the third line.

When the AD value is stable, press ZERO to calibrate ZERO. After 2
or 3 seconds, the second line will show 1.0000.

Place a 1kg weight on the platter and press ZERO when the stable
A/D value is displayed. After 2 or 3 seconds, the display will show
2.0000.

Place a 2kg weight on the platter and press ZERO when the stable
A/D value is displayed. After 2 or 3 seconds, the display will show
3.0000.

Place a 3kg weight on the platter and press ZERO when the stable
A/D value is displayed. After 2 or 3 seconds, the display will show
0.0000. Calibration is now complete.

Turn off the power, and then turn it back on again. Place a weight on
the platter to ensure weighing is correct. If not, repeat the above
steps.