Chapter 564Analog Input FeaturesThis section describes the following features of analog input (A/D) subsystem on the DT9847Series modules:• Analog input channels, described on this page• IEPE functions, described on page 65• Input resolution, described on page 65• Input ranges and gains, described on page 64• Input sample clock sources, described on page 65• Analog input conversion modes, described on page 66• Input triggers, described on page 69• Data format and transfer, described on page 71• Error conditions, described on page 71Analog Input ChannelsThe DT9847-1-1 module provides one analog input channel (channel 0), the DT9847-2-2provides two analog input channels (channels 0 and 1), and the DT9847-3-1 provides threeanalog input channels (channels 0 to 2). These are signal-ended channels; you can connectIEPE sensors to these inputs, if desired; refer to page 65 for more information on IEPEfunctions.Note: To maintain simultaneous operation, all analog input connections on the DT9847Series modules must have the same lead lengths.The DT9847 Series modules use Delta-Sigma analog-to-digital converters (ADCs) that provideanti-aliasing filters based on the clock rate. These filters remove aliasing, which is a conditionwhere high frequency input components erroneously appear as lower frequencies aftersampling.Using software, you can acquire a single value from a single analog input channel, a singlevalue from all the analog input channels simultaneously (for the DT9847-2-2 and DT9847-3-1),or multiple values from a one or more analog input channels. Refer to “Analog InputConversion Modes” on page 66 for more information on specifying and reading data fromthese channels.Input Ranges and GainsThe DT9847 Series modules provide an input range of ±10 V and software-selectable gains of 1and 10. This provides effective input ranges of ±10 V (when the gain is 1) and ±1 V (when thegain is 10).
