9211 question; and also how to create a simple IP check?
Hello
First of all, with the 4 9211 module channels for thermocouple input, I assume that it's OK to connect different types of thermocouple to different channels at the same time? (for example channel 1 - T type, 2 - E-channel type etc). Also why is the sampling rate for that ' sample/s 14' - seems low - but I can apparently run at much higher rates and labview complain?
Secondly, I would like to implement a simple temperature controller 14 channel FT. I had a quick glance at a few examples, but "PID Control-Multi Channel.vi" (for example) seems only a proportional controller, no full term. Maybe I should just write my own? Can someone point me in the right direction?
Dave
Hi Dave,.
I hope you are well today!
Yes, you can use different types of thermocouples connected to multichannel 9211 in one job. You can simply create a virtual task for a group of channels to the MAX to be aware of this. 9211 is measured from the channels one after the other by scanning through them (time division multiplexing), rather than take all measures at the same time. This is due to 9211 a single ADC, the cold junction compensation circuit and zero circuit automatic.
Now, depending on whether you use CJC and/or the zero function automatic or not, the maximum sampling frequency varies slightly. A comparative table can be seen on page 20 in the datasheet of the 9211.
I suggest the reason why 9211 does not support the higher sampling has been done its designed applications. 9211 is designed for the measurement of the overall temperature of the ground, and it is useless to the temperature of the sample from a point say 20,000 times per second, because in many scenarios the temperature does not change that quickly. Also, following the sampling frequency, noise immunity performance can be increased to the ADC.
Say if I apply for temperature monitoring, I would normally update my temperature every second reading or every half a second and who should provide an accurate indication of my environment. However, if you are looking to make measurements in extreme environments, alternative DAQ devices/sensor should be considered.
Hope this helps,
Tags: NI Hardware
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