NI 6225 using C# to generate/measure current

[johsieh74326]

Hi, I am the rookie in DAQ system, and I have two questions regards it:

1. What is the smallest current (resolution) that NI 6225 can do the current measurment? How to calculate it?

2. How to generate/measure current using the control panel in NI MAX?

3. I am using the example program recently to generate/measure voltage, and it works fine. However, it shows the following message when I am doing the current measurement/generate when I use the example program(ContGenCurrentUpdatesWfm_IntClk    and    ContAcq0_20mACurrentSamples_IntClk ) under CS (C sharp) 

Selected physical channel does not support the output type required by the virtual channel you are creating.

Create a channel of an output type that is supported by the physical channel, or select a physical channel that supports the output type.

Property: NationalInstruments.DAQmx.AOChannel.OutputType

Requested Value: NationalInstruments.DAQmx.AOOutputtype.Current

You Can Select:NationalInstruments.DAQmx.AOOutputType.Voltage

Can you please let me know why is that?  thanks

[Matt_L]

Unfortunately, it doesn't look like that model is capable of measuring current.  In order to do that, you need a model that has that specification, and I've linked a filtered result of the DAQ products that do this here.  From the specifications page you can find the minimum and maximum current range for each product.  If you have one of these products, you should be able to specify one of the analog input / output ports that correspond to current as you would with any other test panel.

Regards,