Ballistic galvanometer
![Ballistic galvanometer calibration setup.](/Images/godic/202412/23/Ballistic_galvanometer_calibration_setup.svg4246.png")
![Grassot fluxmeter, a form of ballistic galvanometer.](/Images/godic/202412/23/Grassot_fluxmeter_with_cover_removed4246.jpg")
![Grassot fluxmeter calibration arrangement using a standard mutual inductor and a known quantity of electrical discharge. Measuring setup is similar.](/Images/godic/202412/23/Grassot_Fluxmeter_constant_determination.svg4246.png")
A ballistic galvanometer is a type of sensitive galvanometer, commonly a mirror galvanometer. Unlike a current-measuring galvanometer, the moving part has a large moment of inertia, thus giving it a long oscillation period. It is really an integrator measuring the quantity of charge discharged through it. It can be either of the moving coil or moving magnet type.