HP 70427A User Manual page 518

Overview
Test 2 - Phase Noise and Spurs (μW LO)
This test measures the source's phase noise and spurs at several carrier
frequencies and reference chain tuning sensitivities. First, the tuning
sensitivity is set to 0.05 ppm/V which makes the 10 MHz oscillator the
reference with the 100 MHz oscillator locked to it and the 600 MHz
oscillator locked to the 100 MHz oscillator. Phase noise and spurs are
measured at 12.6 GHz. Then, tuning sensitivity is set to 1 ppm/V which
makes the 100 MHz oscillator the reference with the 600 MHz oscillator
locked to it. Phase noise and spurs are measured at 12.6 GHz. Finally, tuning
sensitivity is set to 20 ppm/V which means the 600 MHz oscillator is
free-running. Phase noise and spurs are measured at 2.4 GHz, 12.6 GHz, and
25.8 GHz.
Specification
Refer to the specification table for Microwave source RF output spectral
purity:
0.05 ppm/V (10 MHz oscillator): ................................... Configuration 1
1.0 ppm/V (100 MHz oscillator): ................................... Configuration 2
20 ppm/V (600 MHz oscillator): .................................... Configuration 3
Equipment
HP 70428A Microwave Source Module (with MMS mainframe and
display).
HP 3048A Phase Noise Measurement System with Options 201, H26.
HP 8562A Spectrum Analyzer
HP 70428A Option K01 Tune Voltage Supply.
HP 8491A-10 10 dB Pad.
50 Ω BNC termination.
Test Setup
Set up the HP 3048A according to the HP 3048A Installation Guide.
Connect the reference source and the DUT as shown on the following
diagram:
Test 2 - Phase Noise and Spurs (mW LO)
HP 70427A/HP 70428A User's Guide 14-7
Performance Tests