 For passive type clampers with a capacitor, followed by a diode in parallel with the load, the load can significantly affect performance.The magnitude of "R" and "C" are chosen so that the time constant, formula_1, is large enough to ensure that the voltage across the capacitor does not discharge significantly during the diode's non-conducting interval.A load resistance that is too low (heavy load) will partially discharge the capacitor and cause the waveform peaks to drift off the intended clamp voltage.