Data acquisition problem with NI-DAQmx 9205 and SignalExpress

[johnalbrecht]

Hi everyone,

I am using a NI-DAQmx 9205 connected via ethernet to my computer and Labview SignalExpress running to acquire data. I am working with EMG and I use an amplifier system from GrassTechnologies (http://www.grasstechnologies.com/products/ampsystems/ampsystems.html). The way it works is the electrodes are plugged on the amplifier system and the amplifier is plugged to the NI-DAQmx 9205.

I don't know how to setup the system to be able to read properly the emg signal on SignalExpress.

Does anyone know how to use it?

Thank you for youe help

John

[OKors]

Hi John,

If I were an Applications Engineer I'd probably be able to figure this out on my own but would you mind elaborating on your hardware setup a little? You mention plugging into a "NI-DAQmx 9205", however the NI-DAQmx is the data acquisition 'driver', the [NI]9205 is an Analog Input Voltage module. Do you mean to be plugging into a Compact DAQ or cRIO?

Also, I'm not familiar with EMG readings or the amplifiers/electrodes you're working with.

What is the signal type going into the amplifier from the electrodes, and what is the signal type and range (amplitude) of the signal coming out of the amplifier; AC, DC? I'm assume it's all voltage?

Straight voltages are pretty easy to work with provided you can scale it to usable units.

Lets get your hardware and signal types figured out then we'll be able to tell Signal Express how to handle those signals.  

[MAltmann]

Hi John,

OKors response was well put.  We will need to know what chassis you are using with the 9205 module and what type of signal you are expecting to see come out of your amplifier.