Omega CNiS16D Manuel d'utilisateur télécharger pdf (Page 13)

2.3.4 Strain Gauge

The figure below shows the wiring hookup for 4-wire bridge input.

Figure 2.7

a) 4-Wire Voltage/Bridge Input b) 4-Wire Bridge Input with

with Internal Excitation External Excitation Wiring

Wiring Hookup Hookup

In 4-Wire connections the voltage drop across long excitation lead wires of strain

gauge bridge may cause measurement errors. The output of a strain gauge

bridge also depends on the stability of excitation voltage. To correct for voltage

drop and changes in excitation voltage, 6-wire input configuration and ratio

measurement are used.

In order for the Ratiometric to work properly, the External Excitation should

not drop below 4.6 Vdc.

The figure below shows 6-wire hookup for 6-wire bridge input.

Figure 2.8

a) 6-Wire Bridge Input with b) 6-Wire Bridge Input with

Internal Excitation and External Excitation and

Ratio Measurement Wiring Ratio Measurement Wiring

Hookup Hookup

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Omega CNiS16D Manuel d'utilisateur Page 13