Re:Auto Launch

[Smoker]

Hello All,

Bill here with what has become the most complicated BBQ controller in this part of the galaxy.  I am having some noise issues on the thermocouple inputs and was hoping for some suggestions as what to do to minimize their effect. 

The noise is coming from an ac source on the control panel.  The effect is to cause the analog outputs to display transient readings that translate into about a 20 degree range of readings.

The help screen on my dasylab software suggests that there is a filtering component in the configuration of the analog input but i fail to find it. The help page shows it in the same area as the selecton for continuous read option.

If there is no filtering available in the analog module does anyone have a method of reading a hundred readings and dropping the top and bottom 20% then averaging the the rest?  or something similar.  Speed is not an issue.

I am using an MCC 2416 DAQ and version 11 of Dasylab.

Thanks,

Bill

[TimmTheEnchanter]

Hi Bill,

Since the hardware and software you are using is specific to Measurement Computing, it is best to contact them directly.  They will have the best support resources available to assist you for your application.

Here is the link for MC's online technical support.

I hope this helps!  Please respond if you have any further questions,

-Andrew

Applications Engineer

National Instruments

[Smoker]

Is there a way to have DasyLab automatically start a program when it, DasyLab, is launched on a Windows restart?

Bill...

[CJ_Butler__DASYLab_Pro]

Hi Bill,

I'm still mulling the Filtering question, since the DASYLab Filter module might help. Usually, it's best to eliminate the noise before it's digitized.

With regard to the Startup question.

Double click on a worksheet. Does DASYLab start? If not, follow the prompts to associate the *.DSB file with DASYLab.exe.

Once DASYLab is started, go to the Measurement menu, and select Auto start to activate it.

Close DASYLab.

Double click on the worksheet. Does DASYLab start up and start running? If so, you can now drop a shortcut to the worksheet in the Windows Startup folder.

[TomRizzo]

Bill,

You have to options.

1) Use a low pass filter to let say 1 or 2 Hz

2) Use a date average module set to running average

Both system would still show you a little noise signal due to the math.

To my experience though, is that you need to solve the problem to the source.   You would probably need to have a better grounding between the motor enclosure and the DAQ board.

[Procyan]

Hey Bill, how did you make out with that TC noise problem?  I'm in the same boat.  I tried uisng the filter module set to 1 hz low pass and various averaging .  the filter was not effective but if time is not an issue you can use an averaging module set to cumulative.  The line will flatten out within a minute or so.

I needed faster response and after trying all sorts of grounding and capacitors I finally replaced the USB2416 with an old Fieldpoint TC120 and OPC input socket.  The data looks very good, very low noise without any digital filtering/averaging.  I even removed the caps and grounding to see if there was any effect...none.

Not sure what the reason is but whatever works. 

What are you doing with that BBQ???

Procyan