Agilent Technologies E5500 Series Specifikace Strana 7

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Minimum duty cycle
The duty cycle of the pulsed carrier has a direct
impact on the system noise floor. This is seen as
a scaled degradation of the noise floor by 20 log
(duty cycle) in a residual measurement, due to
a scaling of detector constant by the duty cycle.
While the recommended minimum duty cycle of
1 percent was selected to provide a usable noise
floor, it is possible to reduce the duty cycle even
further, providing the system noise floor remains
low enough to be useful for the measurement.
Table 2-2. Noise Floor Degradation with Duty Cycle
Duty Cycle Noise Floor Degradation
50% 6 dB
10% 20 dB
1% 40 dB
Figure 2-3. Baseband pulse transients
(max. LNA gain and 20 MHz LPF)
Figure 2-4. Baseband pulse transients
(max. LNA gain and 2 MHz LPF)
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