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Chapter 5
Analog Input Features
This section describes the following features of analog input (A/D) subsystem on the DT9837
Series modules:
• Analog input channels, described on this page
• IEPE functions, described on
• Input resolution, described on
• Input ranges and gains, described on
• Input sample clock sources, described on
• Analog input conversion modes, described on
• Input triggers, described on
• Data format and transfer, described on
• Error conditions, described on
Analog Input Channels
The DT9837 Series modules support four, single-ended analog input channels (numbered 0 to
3). All analog input channels are simultaneously clocked. If desired, you can connect IEPE
sensors to these inputs; refer to
Note: To maintain simultaneous operation, all analog input connections must have the same
lead lengths.
The DT9837 Series modules use Delta-Sigma analog-to-digital converters (ADCs) that provide
anti-aliasing filters based on the clock rate. These filters remove aliasing, which is a condition
where high frequency input components erroneously appear as lower frequencies after
sampling.
DT9837 Series modules can acquire a single value from a single analog input channel, a single
value from all the analog input channels simultaneously, or multiple values from a group of
analog input channels. You can also read data from the following channels if supported by
your module:
• Tachometer counter 0 – Supported on the DT9837, DT9837A, DT9837A-OEM, and
• Tachometer counter 1 – Supported on the DT9837A, DT9837A-OEM, and DT9837B
• Gate counter 2 – Supported on the DT9837A-OEM and DT9837B modules
• Analog output readback channel – Supported on the DT9837A module
Refer
and reading data from these channels.
68
DT9837B modules
modules
to"Analog Input Conversion Modes" on page 70
page 69
page 69
page 69
page 69
page 70
page 73
page 75
page 75
page 69
for more information on IEPE functions.
for more information on specifying
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