Source Operation; Overview - HP 70427A User Manual

4

Overview

Source Operation

This chapter consists of a procedure for using the HP 70428A Microwave
Source Module (or HP 70427A or HP 70428A Option 002 in source mode)
as the reference source for microwave phase noise measurements.
The following is a list of considerations for using the HP 70428A in any
application:
•
Power accuracy: Measure output power with a power meter if accuracy
is important. The HP 70428A's output power is nominally set but is not
calibrated.
•
Harmonics: Use a low-pass filter at the HP 70428A's output if the
application requires that harmonics be lower than –10 dBc.
•
Broadband noise-floor: Use a bandpass filter at the HP 70428A's output
if the application requires extremely low noise at offsets greater than 100
MHz.
HP 70427A/HP 70428A User's Guide 4-1