07-03-2014 04:53 PM
Hello,
I am trying to read in the data from some variable number of thermocouples, and then select which of the thermocouples to display on a waveform chart. I am using a PXIe 1082 for my DAQ. I have attached my VI. The problem I get is that sometimes (but not always!) if I apply heat to two thermocouples at a time, their response is much slower then when I just apply heat to one thermcouple. here are pictures of the response of 1 and 2 thermocouples:
I have guessed that it is some sort of timing error and tried to update a few things. I currently have a producer/consumer system set up because I will eventually need to write this data to a file. Maybe something there is causing problems.
Thanks in advance for your help!
07-07-2014 03:23 PM - edited 07-07-2014 03:23 PM
Nate,
After taking a look at your code I notice a few things. These are in no order.
1) you have no wait in your acquisition loop. It might be nice to put a wait in there.
2) try graphing in your producer loop as well as your consumer loop. See if there is a difference between the two.
3) is this actualy a response rate time or a difference in amplitude? It doesnt look like the second screenshot ever gets above 30.
4) how are you heating the thermocouples? is it consistent?
5) if you still think its a response rate problem it would be nice to see an X axis that has more than 2 points.
Let us know if you discover anything else.