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Chapter 1
Hardware Features
Data Translation provides a number of USB instruments to meet your measurement needs,
including the following:
• TEMPpoint – a family of temperature measurement instruments
• VOLTpoint – a family of voltage measurement instruments
• MEASURpoint – a family of mixed temperature and voltage measurement instruments
All of these instruments support Version 2.0 and 1.1 of the USB bus.
The following sections summarize the features of the TEMPpoint, VOLTpoint, and
MEASURpoint USB instruments.
TEMPpoint Features
TEMPpoint instruments include the following models: DT9871U, DT9871, and DT9872.
The key features of TEMPpoint instruments are as follows:
• DT9871U and DT9871:
• DT9872:
• One 24-bit, Delta-Sigma A/D converter per channel for simultaneous, high-resolution
• ±500 V galvanic isolation channel-to-channel and to the host computer to protect signal
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− Configurable analog input channels for thermocouple or differential voltage inputs;
easy-access jacks for each channel for quick wiring
− One CJC (cold junction compensation) input for each thermocouple channel
− B, E, J, K, N, R, S, and T thermocouple types supported; the instrument automatically
linearizes the measurements and returns the data as a 32-bit, floating-point
temperature values
− Input range of ±0.075 V for the DT9871U (with 0.25 μV RMS A/D noise using no
software filtering) and ±1.25 V for the DT9871 (with 5 μV RMS A/D noise using no
software filtering)
− Break-detection circuitry to detect open thermocouple inputs
− Configurable analog input channels for RTDs and differential voltage inputs;
easy-access jacks for each channel for quick wiring
− 100 Ω , 500 Ω , and 1000 Ω platinum RTD types supported using alpha curves of 0.00385
(European) or 0.00392 (American)
− 4-wire, 3-wire, or 2-wire configurations; the DT9872 automatically linearizes the
measurements and returns the data as 32-bit, floating-point temperature, resistance, or
voltage values
− Input range of ±1.25 V
measurements
integrity
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