DORAN MODEL 8000
OPERATING AND SERVICE MANUAL
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Note: 1 = switch closed (on), 0 = switch open (off)
6.3.3 Analog Zero Setting
The zero calibration establishes the load cell output with no load on the scale platform.
The zero offset switches can be set in any combination to obtain the desired offset
using the offset chart as a reference.
The zero offset should be adjusted to obtain a reading between -10000 and-15000 for
an accurate zero calibration and maximized span calibration.
Use a small bladed screwdriver to adjust the dip switches and potentiometer until the
zero reading is in the range mentioned above. Start with S2-1 and S2-2 open and
adjust the zero pot to between -10000 and -15000.
If the reading is too high, then switch in S2-1 and/or S2-2 to bring it in range of the zero
potentiometer.
6.4 ANALOG SPAN CALIBRATION
6.4.1 Span Dip Switch
Load Cell Output S2 Setting for Span
S2-3 S2-4 S2-5
0.5 mv/v 1 1 1
1.0 mv/v 0 1 1
1.5 mv/v 1 1 0
2.0 mv/v 0 1 0
2.5 mv/v 1 0 0
3.0 mv/v 0 0 0
To determine Load Cell output, use the following formula:
Scale Capacity
-------------------- X Full Scale output of the L.C.
L.C. Capacity
For Example :
Scale capacity = 50 lb 50 lb
Load cell capacity = 100 lb ---------
X 2 mv/v = 1 mv/v @ rated L.C. output
Full Scale output = 2 mv/v 100 lb
If you do not get a load cell output that falls within these output ranges, it may be
necessary to change to a smaller or larger capacity load cell.
6.4.3 Analog Span Setting
Span Calibration adjusts the weight display to equal the value of the applied load to the
scale platform.
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