Jackson Labs PHASE STATION 53100A, User Manual

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PhaseStation 53100A User’s Manual V1.04 25-Apr-2022 29
separate them by several dozen hertz or more. If the oscillators are only a few hertz apart, it may be
difficult to spot crosstalk problems in the external RF or power connections.
Finally, note that basic frequency stability measurements on a single channel pair don’t use the second
(CH 2) reference or the second DUT input (CH 4) at all. The CH 2 reference may be powered down or left
unconnected if noise measurements are disabled in the acquisition dialog and no DUT channels are
using CH 2 as a stability reference. Stability measurements that demand the ultimate in Allan deviation
performance can take advantage of the CH 2 and CH 4 inputs through the use of the cross ADEV
measurement role described on page 136.