# Load Cell and Strain Gauging Glossary Of Terms

**Rated Capacity**

The maximum load for which the load cell is designed.

**Span**

Full Scale Output.

**Zero Output (ZO)**

Load cell output with no load applied.

Expressed as % FSO

**Full Scale Output (FSO)**

Load cell output at rated capacity (full scale),

Expressed in mV/V (milliVolts output per Volt excitation) as net value (output at rated capacity minus output at zero).

**Best Straight Line**

The straight line between Zero Output and Full Scale Output, used to determine load cell output errors.

**Non-Linearity**

The deviation of load cell output from the Best Straight Line, recorded with increasing loads.

Expressed as % FSO

**Hysteresis**

The difference in load cell outputs from equivalent increasing and decreasing loads.

Expressed as % FSO

**Maximum Error / Combined Error**

The maximum error of load cell output from the Best Straight Line, considering both Non-Linearity and Hysteresis.

Expressed as % FSO

**Output Symmetry**

The difference in FSO from tension operation to compression operation.

Expressed as % Average FSO

**Temperature Effect on Zero**

The change in ZO due to a specified change in temperature.

Expressed as % FSO / °C

**Temperature Effect on Span**

The change in output due to a specified change in temperature.

Expressed as % Output / °C

**Creep**

The change in FSO occurring over time with all conditions remaining constant.

All materials exhibit creep effects to varying degrees. Load cell creep can be minimised by matching the creep compensation of the strain gauge to the load cell element material used.

Expressed as % FSO / specified time period (usually 20 minutes).

**Creep Return**

ZO after unloading the load cell from a specified time period. Recorded after equivalent time period to which the load was applied.

Expressed as % FSO / specified time period (usually 20 minutes).

**Non-Repeatability**

The difference in recorded output from successive loadings under constant conditions.

Expressed as % FSO

**Excitation Voltage**

The safe Voltage used to obtain output values within the quoted specification.

Expressed in Vdc or Vac.

**Input Resistance**

The electrical resistance of the load cell’s strain gauge circuit, measured across excitation connections with signal connections open circuit.

Expressed in Ohms

**Output Resistance**

The electrical resistance of the load cell’s strain gauge circuit, measured across signal connections with excitation connections open circuit.

**Insulation Resistance**

The electrical resistance measured between the load cell’s strain gauge circuit and the load cell element.

Expressed in Ohms

**Primary Axis**

The axis of load for which the load cell is intended.