Jump to content
  • 0

Frequency measurement using 1208LS



I have the board set up for single ended. What I dont understand is when I apply a 4hz square wave to the inputs I get the correct result. When I turn off the applied signal I get the strange values shown below I was expecting to see zero.




Link to comment
Share on other sites

4 answers to this question

Recommended Posts

  • 0

Hello @vmrak.

Thank you for the example.  Your device does not appear to have an issue if it is capturing expected data values with valid signal connections.  Without a signal connected to the input channels, the USB-1208LS is measuring surrounding environmental noise.  MCC devices were designed to work with low impedance signal sources.  MCC device inputs that are unconnected (open) are considered high impedance and will charge up to various stray voltages.  Notice that your detected amplitudes are in the microvolt range, so disregard those values.

Also, as you increase the signal frequency to the device, consider increasing the sample rate and number of samples per channel.



Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
  • Create New...