Sweep-Segments - Agilent Technologies E5500A User Manual

Hide thumbs Also See for E5500A:
Table of Contents

Advertisement

Sweep-Segments

Checking the
Beatnote
Document Part No. E5500-90024Ed. 1.0
Measuring PLL suppression...
The required correction data is created to compensate for the phase
noise suppression which occurs within the bandwidth of the phase
lock loop created for this measurement.
6
The computer displays the PLL suppression curve and associated
measurement values. Press Continue using Adjusted Loop
Suppression to continue making the noise measurement. The
measurement can be stopped by pressing the Abort key.
When the system begins measuring noise, it places the noise graph
on its display. As you watch the graph, you will see the system plot
its measurement results in frequency segments.
The system measures the noise level across its frequency offset range
by averaging the noise within smaller frequency segments. This
technique enables the system to optimize measurement speed while
providing you with the measurement resolution needed for most test
applications.
When the measurement is complete, refer to
Your Measurement Results" for help in evaluating your measurement
results. (If the test system has problems completing the
measurement, it will inform you by placing a message on the
computer display.
While the Connect Diagram is still displayed, recommend that you
use an oscilloscope (connected to the Monitor port on the Agilent
70420A) or a counter to check the beatnote being created between
the reference source and your device-under-test. The objective of
checking the beatnote is to ensure that the center frequencies of the
two sources are close enough in frequency to create a beatnote that is
within the Capture Range of the system.
The phase lock loop (PLL) Capture Range is 5% of the peak tuning
range of the VCO source you are using. (The peak tuning range for
your VCO can be estimated by multiplying the VCO tuning constant
by the tune range of VCO. Refer to
Measurement Results" if you are not familiar with the relationship
between the PLL capture range and the peak tuning range of the
VCO.)
E5500 Phase Noise Measurement System Version A.02.00
Expanding Your Measurement Experience
Testing the Agilent 8663A Internal/External 10 MHz
Chapter
Chapter
15, "Evaluating Your
5
15, "Evaluating
5-21

Advertisement

Table of Contents
loading

This manual is also suitable for:

E5500b

Table of Contents