• View
• Edit
• History
• Print

Measuring Harmonics

Before you start measuring harmonics, be aware you understand the Spur Free Dynamic range and avoid overloading the input, stay as low as possible, preferrably below -30dBm

Here are some example measurements of a 40MHz signal from various sources

First from a DDS

Second from a SI5351

And third from a ADF4351

The differences in harmonics and the aliases from the DDS are clearly visible.

These measurements are done with all settings on default, only the scan stop frequency is set to 250MHz