HP 8753D Option 011 Service Manual page 96

On occasion the largest spur appears as one of a group of ve evenly spaced spurs as shown in
Figure 3-13. The target spur is again the fourth from the left (not the fth, right-most spur).
Figure TARGET2 here.
Figure 3-13. Target Spur in isplay of Five Spurs
Figure 3-14 shows another variation of the basic four spur pattern: some up, some down, and
the target spur itself almost indistinguishable.
Figure TARGET3 here.
RAFT
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Figure 3-14. Target Spur Almost Invisible
Adjustments and Correction Constants 3-31