A microwave energy delivery and measurement system, comprising: a microwave energy source configured to delivery microwave energy to a microwave energy delivery device; a measurement system configured to measure at least one parameter of the microwave energy delivery device, said measurement system configured to actively measure in real time at least one parameter related to the microwave energy delivery device; and a switching network configured to electrically isolate the microwave energy source and the measurement system; wherein the switching network includes: a first switch; a first resistive load connected between a ground potential and the first switch; a second switch; a second resistive load connected between a ground potential and the second switch; a circulator connected between the first and second switches; and a third resistive load connected between a ground potential and the circulator, wherein the first switch directs the microwave energy between the first resistive load the and the circulator, the circulator directs microwave energy from the first switch to the second switch and directs energy from the second switch to the third resistive load, wherein the second switch, in a first condition, connects the microwave energy delivery device to the circulator and connects the second resistive load to the measurement system and the second switch, in a second condition, connects the microwave energy delivery device to the measurement system and connects the second resistive load to the circulator. wherein in a first condition microwave energy from the microwave energy source is supplied to the microwave energy delivery device through the first switch, the circulator and the second switch and the measurement system is isolated by the second switch. wherein in a second condition the measurement system connects to the microwave energy delivery device through the second switch and the first switch and the second switch isolate the microwave energy source from the measurement system. a microwave energy source configured to delivery microwave energy to a microwave energy delivery device; a measurement system configured to measure at least one parameter of the microwave energy delivery device, said measurement system configured to actively measure in real time at least one parameter related to the microwave energy delivery device; and a switching network configured to electrically isolate the microwave energy source and the measurement system; wherein the switching network includes: a first switch; a first resistive load connected between a ground potential and the first switch; a second switch; a second resistive load connected between a ground potential and the second switch; a circulator connected between the first and second switches; and a third resistive load connected between a ground potential and the circulator, a first switch; a first resistive load connected between a ground potential and the first switch; a second switch; a second resistive load connected between a ground potential and the second switch; a circulator connected between the first and second switches; and a third resistive load connected between a ground potential and the circulator, wherein the first switch directs the microwave energy between the first resistive load the and the circulator, the circulator directs microwave energy from the first switch to the second switch and directs energy from the second switch to the third resistive load, wherein the second switch, in a first condition, connects the microwave energy delivery device to the circulator and connects the second resistive load to the measurement system and the second switch, in a second condition, connects the microwave energy delivery device to the measurement system and connects the second resistive load to the circulator. wherein in a first condition microwave energy from the microwave energy source is supplied to the microwave energy delivery device through the first switch, the circulator and the second switch and the measurement system is isolated by the second switch. wherein in a second condition the measurement system connects to the microwave energy delivery device through the second switch and the first switch and the second switch isolate the microwave energy source from the measurement system.