Differential Noise Figure Measurement is Option 48 for the MS464xB Series VNAs which requires front panel access loops from Option 51, 61, or 62. The option is compatible with the ME7838 Broadband/mmWave Systems. Option 48 is also compatible with the MN469xB/C Multiport System.

Noise figure is a fundamental indicator of performance for devices, such as amplifiers, during the design stage and production compliance testing. Option 48 (like Option 41) uses the cold source method of noise figure measurements. Option 48 brings in the capability of differential (and common-mode) noise figure measurements using a variety of sub-methods.

If neither Option 48 nor Option 41 is installed, the Noise Figure button and menu controls are not present in the UI display. If Option 48 is installed, the primary instrument mode can be quickly changed to Noise Figure mode from the default Transmission/Reflection mode to access the menu and dialog box controls. Option 41 also enables the Noise Figure button, but the submenus are different in that case.