Keysight Technologies X Series User Manual page 40

2 Operation
In the Image Suppress mode, synchronization is ensured by first turning off Signal
ID, initiating a single sweep, then turning on Signal ID followed by two single
sweeps.
Image Shift
Like the Image Suppress mode, Image Shift is a two sweep sequence. The data
from the first sweep is placed in Trace 1 and the data from the second (LO
frequency shifted by 2*IF/N) sweep is placed in Trace 2. Signal responses of Trace
1 and Trace 2 that have the same horizontal position are considered to be in the
current band and therefore can be analyzed with the amplitude and frequency
measurement systems of the SA. All other responses are invalid and should be
ignored.
This function takes control of and uses Trace 1 and Trace 2. Any data in these
NOTE
traces prior to activating Image Shift will be lost.
To synchronize in the Image Shift mode, turn off Signal ID and then initiate a
single sweep. Then turn on Signal ID and initiate two single sweeps. The results of
the first sweep after Signal ID is turned on are available in Trace 1. The next sweep
is shifted and the data from that sweep is available in Trace 2. The unshifted and
shifted data can then be compared.
40 Keysight M1971 Series User's Guide