ANSI SP3.3-2016 pdf free download.ESD Association Standard Practice for the Protection of Electrostatic Discharge Susceptible Items
1.1 Purpose
This standard practice provides test procedures for periodic verification of the performance of air
ionization equipment and systems (ionizers).
1.2 Scope
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.
2.0 REFERENCED PUBLICATIONS
Unless otherwise specified, the following documents of the latest issue, revision or amendment
form a part of this standard to the extent specified herein:
ESD ADV 1.0, ESD Association’s Glossary of Terms 2
ANSI/ESD STM3.1 , Ionization 2
3.0 DEFINITIONS
The terms used in the body of this document are in accordance with the definitions found in ESD
ADV1.0, ESD Association’s Glossary of Terms available for complimentary download at
www.esda.org.
4.0 PERSONNEL SAFETY
THE PROCEDURES AND EQUIPMENT DESCRIBED IN THIS DOCUMENT MAY EXPOSE PERSONNEL TO HAZARDOUS ELECTRICAL CONDITIONS. USERS OF THIS DOCUMENT ARE RESPONSIBLE FOR SELECTING EQUIPMENT THAT COMPLIES WITH APPLICABLE LAWS, REGULATORY CODES, AND BOTH EXTERNAL AND INTERNAL POLICY. USERS ARE CAUTIONED THAT THIS DOCUMENT CANNOT REPLACE OR SUPERSEDE ANY REQUIREMENTS FOR PERSONNEL SAFETY. GROUND FAULT CIRCUIT INTERRUPTERS (GFCI) AND OTHER SAFETY PROTECTION SHOULD BE CONSIDERED WHEREVER PERSONNEL MIGHT COME INTO CONTACT WITH ELECTRICAL SOURCES. ELECTRICAL HAZARD REDUCTION PRACTICES SHOULD BE EXERCISED AND PROPER GROUNDING INSTRUCTIONS FOR EQUIPMENT SHOULD BE FOLLOWED. THE RESISTANCE MEASUREMENTS OBTAINED THROUGH THE USE OF THIS TEST METHOD SHALL NOT BE USED TO DETERMINE THE RELATIVE SAFETY OF PERSONNEL EXPOSED TO HIGH AC OR DC VOLTAGES.
5.0 TEST FIXTURE AND INSTRUMENTATION
The following sections describe the instrumentation required for periodic verification of air ionization equipment and systems (ionizers). The test fixture uses an isolated conductive plate for air ion collection. The instrumentation may consist of separate components (high voltage [HV] charging source, voltage monitor, voltage threshold detector and timer), or these components may be integrated into a single instrument. A Charged Plate Monitor (CPM) as described in ANSI/ESD STM3.1 may also be used for periodic and compliance verification. Correlation of the instrumentation used in this document with the CPM defined in STM3.1 is recommended. See Annex B for additional information. The test fixture is to consist of an isolated conductive plate separated from a ground plate on insulating standoff(s). Additional instrumentation is used to charge the isolated conductive plate and monitor the voltage (See Figures 1 and 2). A voltage source that provides a voltage in excess of the initial test voltage of each polarity is required to charge the isolated conductive plate of the test fixture. The voltage source should be current limited so as to meet the requirements of Section 4.0 – Personnel Safety. The voltage on the isolated conductive plate shall be monitored in such a way that, when in the absence of ionization, the isolated conductive plate voltage shall not decay more than 1 0% of the initial test voltage within one minute. The response time of the monitoring device shall be sufficient to accurately measure changing voltages. A timer or other appropriate means should be used to measure the discharge times.
6.0 GENERAL MEASUREMENT PROCEDURE
Each ionization application or installation may require a different measurement procedure. Initial and final test voltages should be documented and may be changed if required. The actual measurement procedures and parameters (i.e., equipment, test voltages, test fixture distance and location, air velocity, fan speed settings, compressed gas pressure) should be documented and attached to the test data for use during subsequent periodic verifications. Procedures should be a part of the initial acceptance process to provide baseline data for comparison with future measurements. A schedule should be established for performing periodic verification. The following test steps are common elements to the periodic verification of all types of ionizers.
