Scale Voltage to EU Problem

[Adi_1017]

Hi,

I am not sure whether I have post this question on the right board or not. I apologise if it wasn't.

At the moment I have 15 channels of waveform inputs (voltage) and I want to convert them into acceleration hence I have selected Scale voltage to EU.vi  (N chan - N info), but I am not sure should it be waveform DBL or SGL.

Furthermore, I am trying to edit the sensitivity of each input and set them as default. when I run the program, it pops up with an error stating :

Possible reason(s):

Sound & Vibration:  The number of elements in the configuration settings array should equal the number of elements in the input signals array.

I must have done something wrong in the channel info. Could someone please give me some help?

I have attached my vi.

[dsb@NI]

DAQmx Read and also DAQ Assistant Express VI return waveform data as double precision values.

You certainly can use the Scale Voltage to EU VI to apply the sensor sensitivty. Rather than set the default for the array of channel info on the VI, create a constant by right clicking on the channel info terminal on the subVI.

Then you can set the sensitivity per channel of the channel info array.

Out of curiosity, did you consider configuring the acceleration measurement (and scaling) inside the DAQ Assistant? You can set the sensitivity per channel, even calibrate each channel/sensor if that is part of your testing procedure, and then the DAQ Assistant will always return data scaled to the configured units.

What software versions are you using?

LabVIEW

DAQmx

Sound and Vibration

You may want to refer to the example <drive:>\Program Files\National Instruments\<LabVIEW>\examples\Sound and Vibration\Vibration Level Measurements\SVXMPL_Human Vibration (DAQmx).vi

[Adi_1017]

Hi Doug,

Thanks for your reply.

I did consider to configure the acceleration meeasurement inside the DAQ Assistant, but I don't know where in the DAQ Assistant that could let me set the sensitity per channel.

I am using:

LabVIEW2010

DAQmx 9.2.2

Sound and Vibration 2010.

Kind Regards,

Adrian

[dsb@NI]

Select the channel in the list in the left part of the configuration area. Edit the configuration for the selected channel(s). The configuration is stored per channel.