What is NPLC and why is it important?

What is NPLC and why is it important?

NPLC is number of power line cycles.  DC Voltage, DC Current, and Resistance measurement resolution, accuracy is reduced by power line induced AC noise.  Using NPLC of 1 or greater increases AC noise integration time, and increases measurement resolution and accuracy, however the trade-off is slower measurement rates.  For highest measurement accuracy NPLC of 100 is recommended.