National Instruments NI 9213, Начало работы

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Minimizing Thermal Gradients
Changes in the ambient air temperature near the front connector or a thermocouple
wire conducting heat directly to terminal junctions can cause thermal gradients.
Observe the following guidelines to minimize thermal gradients and improve the
system accuracy.
■
Use small-gauge thermocouple wire. Smaller wire transfers less heat to or
from the terminal junction.
■
Run thermocouple wiring together near the spring-terminal connector to
keep the wires at the same temperature.
■
Avoid running thermocouple wires near hot or cold objects.
■
Minimize adjacent heat sources and air flow across the terminals.
■
Keep the ambient temperature as stable as possible.
■
Make sure the NI-9213 terminals are facing forward or upward.
■
Keep the NI-9213 in a stable and consistent orientation.
■
Allow the thermal gradients to settle after a change in system power or in
ambient temperature. A change in system power can happen when the
system powers on, the system comes out of sleep mode, or you insert/remove
modules.
■
Use the NI 9940 backshell kit.
■
If you connect any extension wires to thermocouple wires, use wires made
of the same conductive material as the thermocouple wires.
Overvoltage Protection
The NI-9213 provides overvoltage protection between any two inputs.
Note
Refer to the device datasheet on ni.com/manuals for more
information about overvoltage protection.
ni.com
10
NI-9213 Getting Started