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QHW digital weighing scales user’s guide
- 6 -
SECTION 6 OPERATION
6.1 ZEROING THE DISPLAY
You can press the ZERO/ENTER key at any time to set the zero point from which all
other weighing and counting is measured, within 4% of power up zero. This will
usually only be necessary when the platform is empty. When the zero point is
obtained the display will show the indicator for zero.
The scale has an automatic rezeroing function to account for minor drifting or
accumulation of material on the platform. However you may need to press the
ZERO/ENTER key to rezero the scale if small amounts of weight are shown when the
platform is empty.
6.2 TARING
Zero the scale by pressing the ZERO/ENTER key if necessary. The zero indicator will
be on.
Place a container on the platform, a value for its weight will be displayed.
Press the TARE key to tare the scale. The weight that was displayed is stored as the
tare value and that value is subtracted from the display, leaving zero on the display.
The "TARE" indicator will be on. As product is added only the weight of the product
will be shown. The scale could be tared a second time if another type of product was
to be added to the first one. Again only the weight that is added after taring will be
displayed.
When the container is removed a negative value will be shown. If the scale was tared
just before removing the container this value is the gross weight of the container plus
all product that was removed. The zero indicator will also be on because the platform
is back to the same condition it was when the ZERO/ENTER key was last pressed.
6.3 WEIGHING A SAMPLE
To determine the weight of a sample first tare the empty container then place the
sample in the container. The display will show the weight and the units of weight
currently in use.
6.4 PERCENT WEIGHING
The scale will allow a sample weight to be shown as 100%. Then any other weight
placed on the scale will be displayed as a percentage of the original sample. For
example is 350g is placed on the scale and the % key is pressed the display will
show 100.00%.
Removing the 350g weight and putting a 300g weight on the scale the display will
show 85.71% as 300g is 85.71% of 350g.
Note: the scale may jump by large numbers unexpectedly if small weights are used to
set the 100% level. For example if only 23.5g is on a scale with 0.5g increments
and the scale is set to 100%, the display will show 100.00%, however a small change