Data Translation DT9871, User Manual

Page: 89 / 134

Principles of Operation
89
Analog Input Features
This section describes the following features of the analog input (A/D) subsystem on
TEMPpoint, VOLTpoint, and MEASURpoint instruments:
• Analog input channels, described on this page
• Input ranges, described on page 92
• Resolution, described on page 94
• Calibration, described on page 94
• Sample clock, described on page 95
• Trigger source, described on page 95
• Conversion modes, described on page 96
• Filtering, described on page 97
• Data format, described on page 97
• Error conditions, described on page 98
Analog Input Channels
TEMPpoint, VOLTpoint, and MEASURpoint instruments provide up to 48 analog input
channels. The number of channels and the channel types supported (thermocouple, RTD, or
voltage input) depend on the specific instrument model you purchased, as shown in
Table 2 .
Table 2: Number and Type of Analog Input Channels
Instrument
Type Models
# of
Analog Input
Channels Channel Types
TEMPpoint DT9871U-8 and DT9871-8 8 8 thermocouple inputs (numbered 0 to 7)
DT9871U-16 and DT9871-16 16 16 thermocouple inputs (numbered 0 to 15)
DT9871U-24 and DT9871-24 24 24 thermocouple inputs (numbered 0 to 23)
DT9871U-32 and DT9871-32 32 32 thermocouple inputs (numbered 0 to 31)
DT9871U-40 and DT9871-40 40 40 thermocouple inputs (numbered 0 to 39)
DT9871U-48 and DT9871-48 48 48 thermocouple inputs (numbered 0 to 47)
DT9872-8 8 8 RTD inputs (numbered 0 to 7)
DT9872-16 16 16 RTD inputs (numbered 0 to 15)
DT9872-24 24 24 RTD inputs (numbered 0 to 23)
DT9872-32 32 32 RTD inputs (numbered 0 to 31)
DT9872-40 40 40 RTD inputs (numbered 0 to 39)
DT9872-48 48 48 RTD inputs (numbered 0 to 47)