This standard practice establishes a measurement technique@ under recommended conditions@ to periodically determine offset voltage (ion balance) and discharge (neutralization) time 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 methods and procedures for periodic verification of the performance of air ionization equipment and systems (ionizers).