Overload distorts a measurement at excessive input level; the noise floor limits visibility at low levels. Adjust the setup to place the wanted signal between both limits.
How it works in practice
Use appropriate external protection, internal attenuation, reference level and resolution bandwidth according to the instrument. Changing settings can alter the displayed floor and distortion behavior. Verify suspected harmonics by checking whether they respond consistently to controlled input-level changes.
Example and interpretation
An analyzer-generated distortion product may change differently from a real source harmonic when input attenuation is adjusted.
Checks before use
- Check input limits
- Check overload indicators
- Adjust level and bandwidth
- Verify suspicious products
Important limit
Do not identify every displayed spur as a signal from the device under test.
Related Centron RF product
SMA rotary attenuator with 1 dB steps. The linked fine-step unit lists 0–10 dB in 1 dB increments. It can be considered for controlled level changes within its ratings. Dial resolution does not establish traceable accuracy; calibrate the assembled path as required.
Further reading
Keysight: Fundamentals of RF and Microwave Power Measurements. This background reference explains general principles; the selected Centron RF model’s datasheet governs its own ratings.
Related guides
Educational guide. Numerical examples use the stated assumptions and are not test results for a supplied unit.