Let me try to explain, if I do get it wrong, I’m sure someone can correct this
Assuming you do the measurements on a Microchip LoRa Mote instead of a Semtech LoRa Technology Mote, you can indeed get a similar signal when you measure directly on the RN2483.
The result of your measurement is explained when you look at the schematic. The Mosfett Q1 and Schottky diode D1 are a typical polarity protection. Then there is the capacitor C3, followed by the step-up converter MCP1625T. I think your resistor is in serie with that capacitor C3 and It seems like you’re measuring loading/unloading C3.
What I measure is the voltage over of a resistance during one transmission action, but of course it is not measuring LoRa Mote’s power consumption. Yes, you know the resistors value, read the voltage and time of that transmission action from the scope and do the calculations for this transmission but that’s not the total powerconsumption of the LoRa Mote, besides there are several other factors that we need to keep in mind.
If you look at the schematic again you can find some spots for direct measure on the RN2483. You can put (like GPIO connector J4) a 10 Ohm resistor in series with one of the 3.3V connection and your powersupply. Connect you probe over that resistor. Keep in mind there is a voltage drop over that resistor so the your input voltage at the RN2483 is slightly lower than the source.
Set the correct timebase, vertical division, vertical offset, the trigger point and take a single trigger shot. With the scope cursor you can do further measurements.
If you configure the Mote for different data rates you can see the difference in the graphs.
Data rate 5SF7
Data rate 2/SF10
Data rate 0/SF12