The instrument used to measure the insulation resistance of electrical equipment is called a "megger". The traditional megohmmeter generally adopts manual method. The voltage generated by the generator in the megger is converted into high-voltage direct current by the circuit and added to the equipment, thus reading the insulation resistance value of the electrical equipment. Therefore, megohmmeter is commonly known as "shaking table", which is named after its working mode.
Telemetry is a concept in power system automation, which means long-distance measurement. Generally, there are voltage, current, pilot voltage, zero sequence current, power and power factor, but they are rarely used to measure insulation resistance.
To sum up, insulation should be measured by "shaking test".