HP 8568B Manual de usuario Pagina 79

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16. Residual FM Test
hr
RF
-I...
L
1u
Figure 2-28. Bandwidth Filter Slope Measurement
8. Compute the detection slope of the 30 Hz filter between the
markers by dividing the MARKER A amplitude by the MARKER A
frequency:
filter slope = MARKER A amplitude/MARKER Afrequency =
dB/Hz
9. Press SWEEP
[CONT),(mj
IOFF).
10. Change
FREQUENCY
SPAN] to 0 Hz. Readjust FREQ ZERO, if
necessary, to position the trace at the center graticule line. The
amplitude variations of the trace (see Figure 2-29) represent the
analyzer residual FM.
Performance Tests
2-57
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