ABB TU841 3BSE020848R1 CPU board

ABB TU841 3BSE020848R1 CPU board

The SCXI-1140 instrumentation amplifiers can reject any voltage within their common-mode input range caused by ground potential differences between the signal source and the module. In addition, the amplifiers can reject common-mode noise pickup in the leads connecting the signal sources to the SCXI-1140 module. However, you should be careful to minimize noise pickup. The common-mode rejection of the instrumentation amplifiers decreases significantly at high frequencies. The amplifiers do not reject normal-mode noise. The common-mode input range of the SCXI-1140 instrumentation amplifiers is defined as the magnitude of the greatest common-mode signal that can be rejected. Thus the common-mode input range for the SCXI-1140 depends on the gain and size of the differential input signal (Vdiff = V+in - Vin). The exact formula for the permissible common-mode input range is as follows: Vcm-allowed = ± (12 V - G |Vdiff | / 2)

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