Calculations recently presented have been interpreted as indicating that the maximum acceleration of a resonator mounted on a shock platform is little affected by the weight of the resonator for tests in which the initial acceleration pulse of the platform is specified. This letter points out that an important assumption of the calculations is seldom fulfilled in actual shock testing and describes alternate calculations which suggest that a resonator with mass equal to the mass of the platform may be overtested by more than 30% or undertested by more than 25% if the platform acceleration is a nominal sawtooth pulse with a specified peak terminal acceleration.