SEr 1. SEr 2. SEr 3. SEr 4. _Addr
Menu items related to communications. These will only appear if an RS232, RS485, USB
or Ethernet board is detected. If so, see Section 18.
How to Maximize Accuracy of Load Cell Measurements
1. Avoid plated connectors or terminal blocks, since dissimilar metals can set up thermo-
electric voltages in the millivolt range. If possible, use copper wiring throughout. If you have
to use a junction box, have copper wire touch copper wire.
2. With long cable runs, use six-wire hookup, where the extra two wires are used to sense the
excitation voltage at the load cell. This allows ratiometric meter operation to correct for
voltage drops in the excitation wires.
3. Use twisted, shielded wire from the meter to the load cell to minimize pickup of electrical
noise. Connect the shield to signal input ground at the meter. Do not connect the other end
of the shield.
4. Do not run low-level signals in the same cable tray as electrical power to minimize pickup
of electrical noise carried by power lines.
5. If pickup electrical noise is unavoidable, use the digital filtering capability of our meter to
apply a time constant that averages out random noise over time.
6. Use 5V excitation, not 10V excitation, with miniature or button-type load cells. Even though
small 350-ohm bridge load cells may be rated for 10V, the higher voltage will produce four
times as much self-heating and will cause thermal errors.
7. Operate load cells within their linear range. Do not exceed specified maximum operating
limits so as not to damage the load cell.
8. Operate load cell along their principal axis. Do not apply lateral or twisting forces, as these
will cause deformation and produce non-intended electrical signals.
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