PCIe/PXIe-6302 |
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5.3
Cold-junction compensation
6302 is equipped with a dedicated terminal block TB-68CJ, and two TB-68CJ terminal
boxes provide a total of 8 cold-junction temperature measurement.
There are four temperature sensors evenly distributed on each TB-68CJ, and each
temperature sensor is responsible for the cold-junction temperature measurement
of the four channels adjacent to it.
When the user starts a task, the PCIe/PXIe-6302 will simultaneously scan the
cold-junction temperature and store the data in the onboard memory. When the
user reads the data, the PCIe/PXIe-6302 driver will automatically pair the
measurement channel data with the cold-junction channel data for cold-junction
compensation.
Terminal block connection automatic detection
6302’s pins include the power and communication interface of the TB-68CJ. The
software driver can check whether the TB-68CJ is properly connected.
When the acquisition task is started, the driver will automatically confirm whether
the TB-68CJ on the two connectors are connected reliably. If the TB-68CJ is detected
as not connected, but the channel belonging to the terminal block is added, the task
is not allowed to start and an exception will be thrown.
Customized cold-junction temperature
The PCIe/PXIe-6302 driver allows the user to customize the cold junction
temperature for each channel. To use this function, you should disable the build-in
cold-junction compensation (set the property
BuildInCJCEnabled
to
False
) before
start the task, and call the function
SetRJTemperature
to set the cold-junction
temperature after starting the task and before reading the data.
Unlike the build-in CJC, this customized cold-junction temperature data is not
synchronized with the hot-junction temperature data, but takes effect every time
the
ReadData
function is called.
Learn by Example 5.3
Connect the K-type Thermocouple’s positive pole and negative pole to Terminal
Summary of Contents for PCIe/PXIe-6302
Page 8: ...PCIe PXIe 6302 jytek com 4 Figure 3 TB 68CJ Pin Define...
Page 11: ...PCIe PXIe 6302 jytek com 7 2 3 Specification 2 3 1 Input Characteristics...
Page 14: ...PCIe PXIe 6302 jytek com 10 Table 6 Pinout defination...
Page 17: ...PCIe PXIe 6302 jytek com 13 Figure 11 Typical Noise Level 2 Figure 12 Typical Noise Level 3...
Page 18: ...PCIe PXIe 6302 jytek com 14 Figure 13 Typical Noise Level 4 Figure 14 Typical Noise Level 5...
