Scripting -Ramped Output With Simultaneuos Input

[benndorf]

I am a new user of Labjack U12 and Daqfactory Express.

For my measurement I need I ramped output, 0 to 5 Volts in steps of 0.05 V with a deleay (channel AO0, "Output").

For each steps I want to measure an input voltage (channel AI0, "MyChannel").

I used a script from the LJGuideSamples/RampsSample.ctl

and made my own modification:

using("device.labjack")

include(c:\daqfactory\labjackud.h")

private err

private val

Output=o

while(Output<5)

Output = Output +0.05

err=eGet(0,LJ_ioGet_AIN,0,@val,0)

MyChannel-AddValue(val)

endwhile

When I startet the sequence, it works fine, but...

I get the ramp, I can see the incoming values from "MyChannel".

But when the ramp is finished, "MyChannel" is still reading data.

What I need is the following:

Each time the sequence set a new step in the ramp, I want to read a value from "MyChannel". If the ramp has finished, I want also to finish the reading of "My Channel".

How can this be done?

I am looking forward for usefull help.

Carsten, from Lima, Peru

[AzeoTech]

I'm assuming the typos in the script are from you retyping it? For example Output = o, I think you meant = 0 (zero, not the letter O), likewise, its myChannel.addValue() not myChannel-addvalue.

I'm guessing that myChannel has a non-zero timing, thus the reason it keeps reading. Just set the timing to 0. Also, you can avoid using eGet() by making myChannel the appropriate LabJack channel, timing = 0, then use:

read(myChannel)

instead of the err= and addvalue() lines.

[benndorf]

Dear Mr. Guru,

thank you very much for your prompt reply.

Yes, by retyping I made the two errors you mentioned.

I changed the timing for " MyChannel" to timing = 0.00

Instead of err= and addvalues I used read().

However, after the output ramp has finished, the input channel "MyChannel" is still reading data. What the hell I am doing wrong?

Again, thank you for your help.

Carsten

[AzeoTech]

You probably have another channel with the same device type, D#, I/O type and channel # and non-zero timing (but a different name). If not, post your .ctl and I can take a look.

[benndorf]

Again, thank you very much for your help. I solved the problem. But...

I wrote a new script, also based on the LJGuideSamples and made my own modifications. Now it works fine.

But I really dont know, what was wrong with my first scipt. Anywhow, I am now quite satisfied.

Best ragards

Carsten

[AzeoTech]

I can't say without seeing the original document, but as long as its working, I suppose we can just move on...