Bruel & Kjaer Accelerometer - Amplifier - Labview

[hannabob]

Hi 

We finally managed to set up our accelerometer from brüel & kjaer (type 4508b)  and the nexus condition amplifier (2693) and connect it to LabView. However now we are struggling with the block diagram. We would like to see our raw data (also in a graph) and also be able to save it, what are we doing wrong? 

[RavensFan]

No idea.  All you attached is a picture, rather than an actual VI.  But even if we had the actual VI, we wouldn't have the driver subVI's.

What I do see:

1.  Those subVI's put out an odd colored green wire.  It seems more like a reference type wire than actual data that would be either numeric or strings.  If it is a reference, why would you connect that to an Init Array function?

2.  You have a "Set" subVI there.  It seems like you would wan to use a "Get" VI to get the data.

3.  You have Amp info and Get Channel running in parallel to each other.  I don't know what happens inside of them, but it is possible any Write/Read  code in there are conflicting with the Write/Read code in other other subVI.  Those probably should be in series by way of the error wire.

4.  There probably should be some sort of Disconnect or Close subVI after the While Loop.

[Henrik_Volkers · Accepted solution]

Are you shure that you can read raw acceleration values via RS232 ?

You can use these vis to set and confirm the configuration parameters and get status informations (overload etc)

To capture acceleration values you need to connect it to a DAQ unit and use the DAQmx vis ...

[hannabob]

Yes, you are right, I don’t think it’s possible, we were a little confused.

We finally had to connect it to a DAQ unit and could very easily see the raw data in the DAQ-mc software as you mentioned. 

Thanks for your input! 

Best,

Hanna