For the measure of voltage and current in the ratio frequency range, a suitable instrument is
For the measure of voltage and current in the ratio frequency range, a suitable instrument is Electrothermic type.
Electrothermic instruments work on the principle of heating a wire or element in the instrument due to the current flowing through it.
Because of their ability to measure high frequency currents with minimal errors, electrothermic instruments are often used in applications where other types of instruments, such as moving iron and electrodynamometer type instruments, cannot provide accurate readings.
Electrothermic instruments can also be used for precision voltage measurements at moderate frequencies, but they are not typically used for high-frequency voltage measurements.