Keysight N9038A - SW1 Cal Switch; SW2 Transfer Switch

Keysight N9038A MXE Service Guide 135
Input Selection & Level Control
Input Selection & Level Control Section Purpose
SW1 Cal Switch
This assembly is used to switch the internal 50 MHz and 4.8 GHz calibrator
signals from the A16 Reference assembly into the signal path in front of the
input attenuators.
Control for this assembly comes from the A21 RF Preselector Input assembly.
SW2 Transfer Switch
This assembly is used to select whether or not to divert the input signal
through the RF Preselector section of the instrument or not.
Control for this assembly comes from the A21 RF Preselector Input assembly.