Measurement Computing Data Translation DT3010 Series, Руководство пользователя, Страница: 106 / 232

Principles of Operation
105
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
DT3010, DT3010-268, DT3010/32, and DT3010/32-268 boards have a fixed analog input
resolution of 12 bits. The DT3016 board has a fixed resolution of 16 bits. The analog input
resolution cannot be changed in software.
Analog Input Channels
DT3010 Series boards support 32 single-ended or pseudo-differential analog input channels,
or 16 differential analog input channels. Refer to
Chapter 4 starting on page 49 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.
DT3010 Series 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 110 for more information on
single-value operations.