even when the paint being disturbed has a lead concentration less than the EPA limit of 0.5%. Illustration 1 is a graph of typical airborne lead levels for common work activities when the paint film that is being damaged contains approximately 0.3% leadâa concentration low enough that the material is exempted from RRP requirements.
Reactance is mathematically symbolized by the letter âXâ and is measured in the unit of ohms (Ï). Impedance is a comprehensive expression of any and all forms of opposition to electron flow, including both resistance and reactance. It is present in all circuits, and in all components.
Measurement frequency: Since the reactance is a function of frequency, your choice of measurement frequency should reflect the usage of the component. For capacitors, larger values (tens to hundreds of Î¼F or more) are often used in power supply filtering applications, so should be tested at twice the line frequency.