An infusion pump (10) is provided for pumping fluid though an administration set at a constant flow rate. The pump includes a pumping mechanism (12) for pumping fluid and operates at a pulse frequency, and a controller (14) controls the pulse frequency. Additionally, the pump has one or more sensors (20) configured for measuring at least one characteristic value relating to a status of the infusion pump. The controller (14) is configured for causing the pumping mechanism (12) to operate at a first pulse frequency, and the one or more sensors (20) measure the characteristic value intermittently. When the measured characteristic value meets a threshold value, the controller (14) causes the pumping mechanism (12) to operate at a second pulse frequency different from the first pulse frequency.
