Measurement Computing Data Translation DT3034, User Manual

Page: 72 / 178

Principles of Operation
71
Analog Input Features
This section describes the features of the analog input (A/D) subsystem, including the
following:
• Analog input resolution
• Analog input channels
• Input ranges and gains
• A/D sample clock sources
• Analog input conversion modes
• Trigger sources and trigger acquisition modes
• Data formats and transfer
• Error conditions
Analog Input Resolution
DT3034 boards have a fixed analog input resolution of 16 bits. The analog input resolution
cannot be changed in software.
Analog Input Channels
DT3034 boards support 32 single-ended or pseudo-differential analog input channels, or 16
differential analog input channels. Refer to
Chapter 4 starting on page 39 for a description of
how to wire these signals. Use software to specify the channel type.
Note: For pseudo-differential inputs, specify single-ended in software; in this case, how you
wire these signals determines the configuration.
DT3034 boards can acquire data from a single analog input channel or from a group of analog
input channels. Channels are numbered 0 to 31 for single-ended and pseudo-differential
inputs, and 0 to 15 for differential inputs. The following subsections describe how to specify
the channels.
Specifying a Single Channel
The simplest way to acquire data from a single channel is to specify the channel for a
single-value analog input operation using software; refer to
page 76 for more information on
single-value operations.