Vishay 2310 Betriebsanweisung PDF herunterladen (Seite 20)

The Error is the percentage difference between measured strain and simulated strain. The

Maximum Error is the largest observed error in the five samples taken. The Average Error is

given by:















  









where 



is the Error of each reading.

For each reading, the standard deviation of the signals after applying simulated load is

calculated; this is equivalent to RMS noise. Peak-to-peak noise amplitude is within 8 times RMS

value 98% of the time.

Note that the sources of measured output noise not only include the components in the

signal conditioner, but also include other hardware in the set-up. The set-up is designed to

simulate real conditions in the laboratories.

A second output testing is conducted with actual strain. With the clamped cantilever, a

known weight is attached to the free end of the beam, simulating strains between 200 micro

strain and 300 micro strain. Accuracy of 3 signal conditioners is tested by this method.

The test results for all four systems are reviewed and compared to eliminate systems with

less desirable performances.

3.1.3 Comparison of Set-up Procedure

The laboratories require systems that are easy and safe for students to connect and

balance. Gain setting and gain indication mechanisms are necessary. Among the signal

conditioners with acceptable performance (determined by in-lab output testing), the connection

layout, balancing procedure and gain setting procedure are compared to eliminate the ones

unsuitable for use in these laboratories.

Thus, the remaining systems should have both acceptable performance and suitable set-

up procedures to be used in selected laboratories.

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Vishay 2310 Betriebsanweisung Seite 20