labjack UE9

[tania]

i am new to Labjack UE9 ...when i am giving an input sinal of sine wave to the labjack and observing the graph using DAQFactory...i can see that the negative peaks are clipped...i dnt know where i went wrong please guide!

[LabJack Support]

Sounds like you are using a unipolar range, and you want the bipolar +/- 5 volt range. You need a request to set the range of that analog input channel to bipolar 5 volts. You can see this in the pseudocode near the end of Section 4.3.3 of the UE9 User's Guide.

In the stream example, add the following request to the Start_Stream sequence. It can go anywhere before the GoOne call, so just make it the first line of the sequence:

Device.LabJack.AddRequest(Var.d_number,"LJ_ioPUT_AIN_RANGE", 0, 3, 0);

This is saying that you want to set the AIN range, on channel=0, to value=3. You can see from the labjackud.h header file that 3 is the constant for bipolar +/-5 volt range (LJ_rgBIP5V=3). You should be able to use the string LJ_rgBIP5V, which is more readable, but this does not work in older versions of DAQFactory so just use 3.

[tania]

thank you very much

[tania]

Sounds like you are using a unipolar range, and you want the bipolar +/- 5 volt range. You need a request to set the range of that analog input channel to bipolar 5 volts. You can see this in the pseudocode near the end of Section 4.3.3 of the UE9 User's Guide.

In the stream example, add the following request to the Start_Stream sequence. It can go anywhere before the GoOne call, so just make it the first line of the sequence:

Device.LabJack.AddRequest(Var.d_number,"LJ_ioPUT_AIN_RANGE", 0, 3, 0);

This is saying that you want to set the AIN range, on channel=0, to value=3. You can see from the labjackud.h header file that 3 is the constant for bipolar +/-5 volt range (LJ_rgBIP5V=3). You should be able to use the string LJ_rgBIP5V, which is more readable, but this does not work in older versions of DAQFactory so just use 3.

i forgot to set the range for the labjack.thnkx u but .......not with ethernet connection i face the same problem despite the prev changes...

1)i dont think i quite understand the streaming part of it..like how and where to start,,,i read the guide but still in a dilemma where to go?

2)when i set up a new connection using DAQFactory ..labjack via ethernet ... at the monitor window i dnt see anytg and when i set sumtg it says port is busy...

hmm..really confused...after upgrade:UE9 comm:ver1.4;UE9 cntrl:ver1.780;UE9 bootloader:ver1.120

it seems really confusign for a beginner like me...reply!

[AzeoTech]

I'm unsure what direction you got to. Can you please attach your .ctl document so I can determine this?

Also there are samples, including ones for streaming at www.daqexpress.com to make it easy for you.