ABB AO820 3BSE008546R1 output module

ABB AO820 3BSE008546R1 output module

The track-and-hold amplifiers operate as simple buffers when in Track mode, but freeze their outputs when placed into Hold mode. Because all of the track-and-hold amplifiers in each SCXI-1140 module enter Hold mode at the same time, they implement simultaneous sampling of all channels. Simultaneous sampling is useful for preserving phase relationships between channels. Track-and-hold amplifiers are subject to various imperfections, which are listed in Appendix A, Specifications. The track-and-hold amplifiers on the SCXI-1140 exhibit a droop rate of about 10 mV/sec, which means that the output of the track-and-hold amplifier changes about 10 mV for every second that the amplifier is in Hold mode.

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