VTI Instruments Corp.
14
EX1401 Introduction
software selectable filters for maximum flexibility. Complete channel independence ensures data
integrity regardless of sample speed or input overload conditions.
Scalable for Synchronized High-Speed, High-Channel Count
In addition to base class LXI compliance, this instrument also provides extended capabilities like
LXI Clock Synchronization, LXI Event Messaging, and LXI Time Stamped Data, to support easy
integration and synchronization of multiple devices, including existing VXI/PXI/PXIe bus
instrumentation.
Open Thermocouple Detection (OTD)
While the integration of the EX1401 removes many of the reliability and connectivity problems
typically faced by system designers, they still must contend with the reliability of the sensor
connections. Fortunately, the EX1401 aids a great deal in that regard as well. Each thermocouple
input channel generates a very small current (< 10 nA/channel) which drives the input to an open-
circuit state if the transducer is disconnected. Implemented in this way, open transducer detection is
continuous and requires no discrete function call on the part of the user to be activated, offering
more protection than systems that only check on command, as a broken sensor can occur at any time
during testing, not just at installation. In a typical application, the OTD has no effect on the
measurement.
NOTE
Many thermocouple simulators have a much higher impedance than a thermocouple so an offset
may be introduced into the reading when using a simulator. In general, the OTD should only be
active on channels that are being used with actual thermocouples.
The EX1401 additionally offers a front panel OTD LED for each channel that illuminates upon the
recognition of a fault condition. This provides for quick and easy problem channel identification.
Moreover, to ensure that even intermittent problems are identified, the fault recognition is a latching
mechanism, retaining the information of the current acquisition sequence until a new acquisition is
initiated.
Cold Junction Compensation (CJC)
For highest accuracy and stability, the EX1401 provides a precision, analog temperature sensor, per
channel, to measure the reference/cold-junction of the mini TC connector. CJC channels are
measured with a separate, dedicated ADC, per channel and are time correlated to the thermocouple
channel. For those users that prefer to employ an external cold junction, the EX1401 also allows
for the programming input of up to sixteen 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. As the CJC sensors are placed in an isothermal environment, they are
not disturbed by instrument air cooling fan, as well as thermal disturbances from adjacent channels.
Triggering
The EX1401 supports a full function trigger model with a separate arm source and trigger source
event structure. Trigger and arm source events can be independently programmed from a variety of
sources including Immediate, Software, External TTL, Digital I/O, LAN events, and LXI alarms.
Simplified Installation, Setup and Control
In addition to compliance to LXI base specifications, the EX1401 also implemented the LXI Clock
Synchronization, and LXI Event Messaging, Time Stamps and Event Logs. These features make the
EX1401 instruments ideal for distributed measurements throughout a facility – reducing cabling and
installation expense. The ability to connect directly to an Ethernet network using industry standard
Ethernet cable and connections makes it easy for network administrators to oversee the installation.
Using a PoE+ enabled Ethernet switch allows both power and measurement data on a single wire.
Experience how
IVI Digitizer class
driver compliance
simplifies installation and setup.
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