High dynamic range RF power monitor

A device with at least one channel for measuring radio frequency (RF) power levels, comprising:

• a power sensor circuit comprising at least one logarithmic amplifier for measuring RF power levels over a high dynamic range and full range of duty cycles used for magnetic resonance imaging (MRI);
• at least one directional RF coupler electrically connected to said at least one power sensor circuit;
• at least one RF attenuator electrically connected to said at least one directional RF coupler;
• and
• at least one sampling circuit electrically connected to said at least one RF attenuator and said at least one directional RF coupler,
• wherein said at least one sampling circuit performs analog-to-digital conversion of electrical signals received to provide digitals signals for measuring the RF power level in the at least one channel, and
• wherein said at least one RF attenuator is configured to receive an RF signal from said at least one directional RF coupler and provide a signal to said power sensor circuit.