Anritsu FAQs
When calibrating for a noise figure measurement, what is the maximum loss before the DUT that I can have (cables, probe tips, etc)?
The net Excess Noise Ratio (ENR) should not fall below 5dB. The net ENR is calculated as the Noise Source ENR minus any loss after the Noise Source. For example, if you are using a 14 dB ENR noise source, the residual noise should not exceed 9 dB for calibration. This includes the loss before and after the DUT. For high gain devices it may be necessary to add attenuation after the DUT. This can be done after the calibration, and the additional attenuation can be entered as loss after the DUT.
