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If you are not able to tune the beatnote to within the
Capture Range due to frequency drift, refer to Tracking
Frequency Drift in the Problem Solving section of this chapter
for information about measuring drifting signals.
As you observe the beatnote, compare its level to the
following chart to determine the approximate
measurement noise floor for the measurement. If
the beatnote level will not provide an adequate
measurement noise floor to measure your device,
increase the signal level at the R input port of the
HP 11848A.
Ul
tn
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160 -
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1
-37
-27
-17
BEATNOTE LEVEL ON HP 3561A (dBv)
Figure 3-4. The Measurement Noise Floor Can Be
Estimated From the Level of the Beatnote.
Signal Source Applications
3-13
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