Front-Panel Jumpers

Note: Phase-locking and the Reference Receivers

The R1 and R2 reference receivers are used for phase-locking between the RF source and receiver LO. The phase-locking requirement imposes the following restrictions on the reference signal:

• PNA-X and N522x power level: limited by the noise floor

• All models require a clean signal without spurious content

In Frequency Offset Mode (FOM) Opt S93080A, the R1 receiver is NOT used for phase locking. Independent internal circuitry is used to phase lock the source and receivers. When FOM is available, turn FOM ON simply to take advantage of the independent phase locking mechanism. If NOT measuring at different source and receiver frequencies, set the offset to zero, so that the source and receiver frequencies are the same.