The following image is a snapshot of running 24 bit DMM UI page. The display gets updated every 1.2 seconds, it takes approximately 1.2 sec to collect all data samples. Left Input is connected to DC supply, Right Input connected to an AC line. AC needs to be calibrated.

Refresh delay in milliseconds. It is the delay time between reads. The image displays 41 milliseconds delay. Number of data points shows how many values have been received (each value is 24 bit).

Zoom in to the displayed waveform. Expands the waveform in time axis.

Send sampling rate to ADC. Currently sampling rate can be set to 3560 samples/second or 57000 samples/second.

DC filter helps to fight noise. Auto / Manual sets how the unit will set a voltage range. Auto will make the unit test applied voltage and select an appropriate voltage range. Manual will allow a user to set the voltage range.

Manually set voltage ranges: +/0.6V, +/-18V, +/-110V, +/-450V

If you need to store current reading, just click on “Store”

Input 2 display window. Input 2 shows a -0.26V DC offset measured on 118.57 VAC line.

All LabVIEW files you can be downloaded in zip format from the LabVIEW link. Sorry for the mess in my files. I am trying to organize my C source code files, but it might take a while.