ABB NGDR-03C Analog quantity module
In any high-gain, direct coupled, signal path, zero offset errors at the input are multiplied by the path gain and can, therefore, produce large output errors. For this reason, zero autocalibration in the NGDR-03C is performed at the input to the Programmable Gain Amplifier (PGA). As shown in Figure 3.9.4-1, the PGA accepts the output of the 12-bit autozero DAC. Autozero adjustment range is ±10 mV, which correspond to an adjustment resolution of 4.7 µV per DAC LSB.
Electrical power for the NGDR-03C analog networks is supplied by the DC-to-DC Converter shown in Figure 3.10-1. The converter transforms 5 V logic power into regulated and isolated ±15 VDC power with a load capacity of approximately 190 mA on each 15 V bus.
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