CADDOCK MG750 MD936A 250M 1% 167M Ohms 1% HIGH VOLTAGE Through Hole Resistor

A high-impedance resistor is a specialized passive component with an extremely high electrical resistance—typically ranging from megaohms M\Omega to teraohms T\Omega, designed to severely limit current flow, often in the range of nanoamperes or picoamperes.

Key Characteristics and Functions:
Minimal Loading: These resistors are ideal for high-impedance, low-current circuits (e.g., pH sensors, electrometers) because they do not "load" the circuit or significantly alter the voltage being measured.
Voltage Division: They are used to measure or divide very high voltages, allowing for safe sampling with measuring instruments.
Noise Susceptibility: Because they operate with low current, circuits employing high-impedance resistors are highly sensitive to external electromagnetic interference, electrical noise, and leakage currents.
Typical Applications: Used in high-voltage probing, electrostatic measurement, ion chambers, and precise, low-leakage analog front-end circuits.