Doran 8000 - ZERO Function; TARE Function

DORAN MODEL 8000
OPERATING AND SERVICE MANUAL
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3) Scale activity occurs - indicated by the "MOT" LED. The On-Timer is reset and
the scale stays on for another delay period.
4.3.2 ZERO Function
The ZERO pushbutton is active as a zero function in the GROSS weight mode only; it is
inactive in the NET mode. When pressed, the ZERO causes the display to read zero.
It operates on positive or negative gross weights.
There are 3 operating modes for the ZERO function that are menu selectable:
STD Standard Mode which allows full range ZERO pushbutton operation.
44 Handbook 44 Mode which allows only +/- 1.9% of the scale capacity to be zeroed.
CAN Canadian Weights and Measures Mode which allows only +/- 4.0% of the scale
capacity to be zeroed.
Note that when the scale is set for one of the "Legal for Trade" modes, the start-up
reference point is set upon scale power-up. If any weight is left on the scale upon scale
power-up it will be auto zeroed, provided that the weight is within 1.9% ("44") or 4.0%
("CAN") of the calibrated zero.
The weight on the scale will then be set as the overall gross zero reference point. If you
are in a "Legal for Trade" mode, you will not be able to zero any weight exceeding +/-
1.9% ("44") or +/- 4.0% ("CAN") of the rated capacity, based on the gross zero
previously set.
To avoid any potential problems, be sure that the scale is empty when power-up
occurs. This sets the start up zero reference point to the proper value.
4.3.3 TARE Function
The TARE button has nearly the same function as ZERO with the exception that it will
only operate on positive gross weight values. A Tare weight is entered by pressing
TARE momentarily. See Section 6.7 for a list of error codes displayed in the event of
an error.
A new Tare can be entered at any time by simply placing the object to be tared on the
scale and pressing the TARE button momentarily. The scale will enter the net mode.
The ZERO button is inoperative in the net mode.
To clear an entered Tare value, press and hold the TARE button for 1-2 seconds and
the Tare will be set to zero. The message "CLRTAR" will be displayed momentarily
when the tare is cleared with no error and the scale will return to the Gross mode.
The 8000 starts up in the Gross weight mode, which means that the entire weight on
the platform will be displayed. Gross mode is shown when the "NET" indicator is off.
Both TARE and ZERO functions are disabled when the "MOT" (Motion) Indicator is lit.
This eliminates erroneous of Zero or Tare entries while the scale is in motion.