Can anyone help me to write the Discussion for this lab? Thanks so much Power Me

Question

Can anyone help me to write the Discussion for this lab? Thanks so much Power Measurement RF Power Measurement objective: Determine if an RF generator is operating properly by measuring the linearity, calibration, and headroom of the power output. Equipment Needed: Seren R300 RF Generator Bird 4421 RF Power Meter with 4021 Sensor 500 Watt, 50 S2 Dummy Load Experiment Set-Up: Generator 500 Watt, 4021 500 Q Sensor Seren R300 Dummy Load Bird 4421 Power Meter Overview In this laboratory exercise, the power output of a Seren R300 RE Generator will be measured with a Bird 4421 Power Meter. The output power should be measured both in watts and dBm, in order to become familiar with these equivalent ways of specifying RF power. The measured output power will be plotted against the front panel power reading to determine the linearity and calibration of the generator output, and the headroom Procedure: 1. verify that the RF generator, Bird 4421 Power Meter plus 4021 Sensor, and 500 watt dummy load are connected according to the block diagram The above. generator interlock must be connected to the RF match for power to be transmitted 2. Turn the output power control on the Seren RF Generator to its minimum position

Explanation / Answer

Note that your labellings in the plot are wrong

the blue one should be Watts and yellow one graph should be of dBm

For the first discussion where we have to describe the linearity of the graph

First, we will see what exactly linearity means in our context.

We have observed the calibration characteristics by setting up the power on the front panel and measuring the power one the power meter. When the output of the power meter is compared with the front panel we observe a deviation also known as error. The graph of front panel reading and the power meter reading is known as calibration curve which is important in determining if the instrument is meeting its accuracy or range specification.

Linearity is defined as the maximum deviation of the calibration curve from the idealised straight line. The linearity of the generator means that output of the generator should be graphically a straight line. From the graph, we observe that calibration curve is fairly linear and matches with the idealised straight line.

Headroom of the RF generator refers to the amount by which the power-handling capabilities of an RF generator system exceed a designated nominal level.

Here it is given that maximum power limit is 150 watts but readings are taken up to 161 watts on the front panel.\

So headroom is 161-150 =11 watts

The graph is linear and matches y =x straight line . However, if the resolution is increased we may observe slight non-linearity near the front panel reading of 90 and 100

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