Agilent Technologies HP 8642A/B Specifiche Pagina 250

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Considerations for Making a 2 Oscillator Comparison
Unmarked spurs can cause erroneous results for the 2 Oscillator Com-
parison. Marked spurs are automatically stripped out during the compu-
tation, unmarked spurs are not. Unmarked spurs prevent the system from
performing a proper subtraction since spurs cannot be subtracted on a
power basis. Observe the measurement results to insure that a minimum
of unmarked spurs are present around the offsets of interest.
The number of unmarked spurs within the measurement can be reduced
by reducing the measurement bandwidth, or by increasing the number
of averages specified in the FFT or RF Segment Tables for the offsets of
interest.
"ERROR: Insufficient data files for 2 Osc Comparison" message appears
momentarily, if the system is unable to find three results to compare in
the specified mass storage. Verify that the proper mass storage is specified
for your Result Files. (Refer to
Result Files
in Chapter 3, Graphics Functions
for detailed information on specifying a mass storage location.)
4-26 2 Osc. Compar.
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