This standard practice establishes measurement procedures@ under recommended conditions@ to periodically determine offset voltage (ion balance) and discharge (charge neutralization) times for ionizers in their actual use locations. This standard practice does not include measurements of electromagnetic interference (EMI)@ or uses of ionizers in connection with ordnance@ flammables@ explosive items@ or electrically initiated explosive devices. Purpose This standard practice provides test procedures for periodic verification of the performance of air ionization equipment and systems (ionizers).