User`s guide

Table Of Contents
216 Agilent E5505A User’s Guide
7
Residual Measurement Fundamentals
3
Adjust the phase difference at the phase detector as prompted by the phase
noise software.
4
The system will measure the positive and negative peak voltage of the phase
detector using an internal voltmeter. The quadrature meter digital display
can be used to find the peak. The phase may be adjusted either by varying
the frequency of the source or by adjusting a variable phase shifter or line
stretcher.
5
The system software will then calculate the phase detector constant
automatically using the following algorithm:
Figure 152 Connection to optional oscilloscope for determining voltage peaks
Table 30 Acceptable Amplitude Ranges for the Phase Detectors
Phase Detector
50 kHz to 1.6 GHz 1.2 to 26.5 GHz
1
1 Phase noise test Options 001 and 201.
Ref Input (L Port) Signal Input (R Port) Ref Input (L Port) Signal Input (R Port)
+
15 dBm
to
+
23 dBm
0 dBm
to
+
23 dBm
+
7 dBm
to
+
10 dBm
0 dBm
to
+
5 dBm
NOTE
Connecting an oscilloscope to the MONITOR port is recommended because the signal can
then be viewed to give visual confidence in the signal being measured. As an example,
noise could affect a voltmeter reading, whereas, on the oscilloscope any noise can be
viewed and the signal corrected to minimize the noise before making the reading.