Basics Of Rf Amplifier Test With The Vector Net... -

Some VNAs can tune their receivers to multiples of the source frequency to measure second and third harmonics generated by the amplifier.

Most VNAs have a low damage threshold (e.g., +20 dBm). If your amplifier outputs more power than this, place a high-power fixed attenuator on the output side before connecting it to the VNA Port 2. Basics of RF Amplifier Test with the Vector Net...

Before connecting your device, you must protect the VNA’s sensitive input ports. Some VNAs can tune their receivers to multiples

Perform a Full 2-Port Calibration (SOLT: Short, Open, Load, Through) at the exact plane where the amplifier will be connected. Before connecting your device, you must protect the

If your amplifier has a DC bias on the RF lines, use DC blocks to prevent damaging the VNA’s bridge circuitry.

Similar to S11, this measures how well the output port is matched to the load.

A VNA measures the "system," so you must calibrate to remove the effects of cables and adapters.