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Force Probe Basics
There are two types of force probes commonly used: digital and analog. The digital force probe uses microchips to calculate the force on the object, while the analog version uses a spring. When an object is placed on the spring and a force is applied, it causes the spring to stretch. It is similar to an analog bathroom weight scale.
Why Calibrate the Analog?
A spring is a physical object and, as such, is subject to wear and tear over time. The spring stretches repeatedly and is supposed to return to its original shape. Over time, the spring doesn't return exactly to its original shape. Therefore, it shows a force on the scale even without a force being applied. It must be calibrated to zero or else the measurement will be off.
Why Calibrate a Digital Force Probe
A digital force probe connects to a computer for measurement, and the readings are digital. While the probe mechanism is similar, the scale aspect is different. Digital force probes measure more accurately and to several decimal places, so if the calculation if off a fraction it throws off the experiment. Calibration assures the most accurate measurement from the computer and the mechanism.
Calibrating a Force Probe
Force equals the mass of an object multiplied by acceleration. Place an object of known mass on the hook of the force probe. On paper, multiply the mass times the force of gravity (9.8 meters per second squared). The answer is the force. If the answer is different than the scale, then adjust the calibration knob until it matches.