ABB NTDI02 Digital interface terminal unit

ABB NTDI02 Digital interface terminal unit

Table 6-1 shows which pots to adjust for each type of offset for each channel and which DIP switch selects the gain for each channel. Refer to the parts locator diagram in Chapter 2, Configuration and Installation, to determine the location of each component.A complicating factor in the calibration of the module is that the output offset is not the same in Track mode as in Hold mode. This difference is because of a phenomenon known as hold step, in which a small amount of charge is transferred to the track-and-hold amplifier hold capacitor during the transition from Track mode to Hold mode. This charge transfer slightly changes the voltage at the output of the track-and-hold amplifier. The magnitude of the hold step on the SCXI-1140 is approximately 5 mV, enough to make it necessary to calibrate output offset in Hold mode rather than Track mode. You may calibrate input offset without switching the module to Hold mode.

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