: Instrument Operation : Phase Tracking
 
Phase Tracking
Phase tracking enables up to three MG362x1A units to phase track with a very high degree of stability. Phase tracking provides the following additional rear panel connectors to link internal reference signals together:
100 MHz Reference Output: Provides the reference signal to drive up to two other MG362x1A instruments.
100 MHz Reference Input: Accepts the 100 MHz reference signal from another MG362x1A. To enable two MG362x1A instruments to phase track with high stability, connect the instruments as shown in Figure: Phase Tracking Connections of Multiple MG362X1A Instruments using 50 Ω BNC cables and a 50 Ω BNC Tee:
The 100 MHz loopback must be connected on the reference synthesizer as shown. The above adjustment of phase will work successfully when generators are set to the same frequency or frequencies that are harmonically related. The frequencies must be set in advance of making all the adjustments of phase and if the frequencies are subsequently changed, then the process of phase adjustment must be repeated.
Phase Tracking Connections of Multiple MG362X1A Instruments
Once connected as shown in Figure: Phase Tracking Connections of Multiple MG362X1A Instruments, connect an oscilloscope channel to each of the RF outputs from the signal generators to display the initial phase difference between the RF signals. Use the Phase Offset Menu, adjust the phase offset of one of the units to achieve the desired phase relationship as shown on the oscilloscope. Once the desired phase relationship has been achieved, the Phase Offset value may be zeroed. This will not affect the phase shift of the RF output, but will establish the currently set phase as the reference value for all future entries of Phase Offset.
Note 
The 100 MHz loopback must be connected on the reference synthesizer as shown.
The above adjustment of phase will work successfully when generators are set to the same frequency or frequencies that are harmonically related. The frequencies must be set in advance of making all the adjustments of phase and if the frequencies are subsequently changed, then the process of phase adjustment must be repeated.