VTI Instruments EX1000A, User Manual

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EX10xxA Introduction 17
Note: OTD functionality will not be applicable for EX1000A-51C. RX1032 doesn’t have option to
provide OTD LED indication in a fault condition due to its rugged design.
Cold Junction Compensation (CJC)
For highest accuracy and stability, the EX1000A-TC, EX1016A, EX1032A, EX1048A RX1032
provide embedded isothermal input sections that are monitored by precision thermistors (based on
Model#, the number of thermistors can vary), one for every four thermocouple channels. (Note, the
EX1000A may utilize external thermistors as described in the
Voltage Connections section). To
ensure that the CJC information is current and time correlated with the input channels, the CJC
channels are measured with every scan, providing a maximum time separation of less than 4 ms
between the measurement of an input channel and its associated CJC measurement. For those users
that prefer to employ an external cold junction, the EX10xxA also allows for the programming input
of up to forty-eight unique external cold junction temperatures, one for every input channel.
Moreover, the use of internal and external CJC inputs can be mixed throughout the unit on a per
channel basis.
Simplified Installation, Setup and Control
Full LXI Class A compliance makes the EX10xxA of instruments ideal for distributed
measurements throughout a facility – reducing cabling and installation expense. Connect directly to
an Ethernet network using industry standard Ethernet cable and connections. Experience how
plug&play capability simplifies installation and setup.
An onboard, web-accessible user interface allows you to instantly verify communications and
instrument functionality, while IVI and VXI
plug&play drivers provide a familiar application
programming interface to further reduce integration and program development time. For
comprehensive, programming-free data recording setup, management and viewing, use EX10xxA
instruments with one of VTI’s full-featured, turnkey software solutions: EXLab or VTICODA.
Channel Independence
Each of the EX10xxA’s 48 differential input channels is an independent signal conditioning path,
complete with amplification, programmable hardware filtering, and continuous open transducer
detection. This independence frees the user from the problem of channel-to-channel crosstalk that
is pervasive in most multi-channel data acquisition systems. In the EX10xxA, channels have no
influence on each other, regardless of scanning speed or channel state. Specifically, open or
significantly overloaded channels do not affect the measurement results of any other channels.
Measurement Range
The measurement range of the EX10xxA in terms of temperature is a function of its input voltage
range and the capabilities of the thermocouple sensors themselves. Specifically, the measurement
range of the EX10xxA for the standard thermocouple types is the following:
Type Min Temp Max Temp
J
-200 °C (-328 °F) 1200 °C (2192 °F)
K -200 °C (-328 °F) 1372 °C (2502 °F)
T -200 °C (-328 °F) 400 °C (752 °F)
E -200 °C (-328 °F) 900 °C (1652 °F)
S -50 °C (-58 °F) 1768 °C (3214 °F)
R -50 °C (-58 °F) 1768 °C (3214 °F)
B 250 °C (482 °F) 1820 °C (3308 °F)
N
-200 °C (-328 °F) 1300 °C (2372 °F)
T
ABLE
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