ABB FS300R12KE3/AGDR-72C Thermal resistance card
The signal routing paths and multiplexers involved in the FS300R12KE3/AGDR-72C are shown in Figure 3.7-1. The two analog outputs are connected by the self-test multiplexers to the low channel input of any of the analog input multiplexers. This arrangement permits any one of the analog outputs to be sampled by the ADC. It also verifies the operation of the analog input multiplexers by exercising them with known signal levels.
In addition to accepting the selected analog output signal, the self-test multiplexer permits the HIGH and LOW inputs of the Programmable Gain Amplifier (PGA) to be switched simultaneously to signal return. This feature provides a precision "zero" signal for software-correcting common zero offsets in the analog input channels.
Because the low channel inputs of the input multiplexers are shared by both the analog inputs and the self-test multiplexer signal, the corresponding input channels also are routed through the self-test multiplexer.
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