PS081 datasheet(52/155 Pages) AMSCO

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3-29

PSØ81

A more convenient way to change a load cell with 2 Rspan is to switch them in series. This is possib-

le if the connections of the Rspan resistors are available as illustrated in the following picture:

Figure 3.28 Two Rspan in series

Please note: You are not touching the strain gage sensors or the Rspan resistors directly. Instead

you make any re-wiring proposed in the connection field of the load cell. This is true for the changes

regarding Rspan as well as the change from Wheatstone-wiring to PICOSTRAIN-wiring (please see

also chapter 3.3.2).

3.6.4

Nonlinearity of gain drift over temperature

Scope of this item: Only important for calibrated scales, e.g. according to OIML specification.

Independently of the PICOSTRAIN gain drift compensation we have always a nonlinearity of the load

cell over temperature. This nonlinearity generally has two causes, the nonlinearity of the load cell

itself (material, glue, wiring, etc.) and a nonlinearity coming from the paralleling of the Rspan resis-

tor with its adjustment resistor (Rsadj). Normally these two effects are in opposite direction, so that

overall nonlinearity can be reduced. In other words, the nonlinearity introduced by the paralleling

of the resistors is compensating to some degree the nonlinearity coming from the load cell itself.

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