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5
Absolute Measurement Fundamentals
Inserting a Device
An attenuator
You may find that some of your measurement setups require an in-line device
such as an attenuator in one of the signal source paths. (For example, you may
find it necessary to insert an attenuator at the output of a DUT to prevent it
from being injection-locked to the reference source.) The primary
consideration when inserting an attenuator is that the signal source has
sufficient output amplitude to maintain the required signal level at the test
set's phase detector input port. The signal level required for the measurement
depends on the noise floor level needed to measure the DUT.
Figure 80
measurement noise floor.
E5505a_PTR_reqd_inj_lock
25 Mar 04 rev 1
Figure 80 Measurement noise floor relative to R-Port signal level
122
shows the relationship between the signal level at the R port and the
1M
100k
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.1
1
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10k 100k 1M
Peak tuning range (Hz)
10M 100M 1G
Agilent E5505A User's Guide
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