ANSI SP3.4:2016 pdf download.The Protection of Electrostatic Discharge Susceptible Items -Periodic Verification of Air Ionizer Performance Using a Small Test Fixture.
ANSI SP3.4 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
ANSI/ESD STM3.1, Ionization
ANSI/ESD S P3.3, Periodic Verification of Air Ionizers
3.0 DEFINITIONS
The terms used in the body of this document are in accordance with the definitions found in ESD ADV 1.0, 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 an example of a test fixture and instrumentation used for periodic verification of air ionization performance in confined spaces. The test fixture in this example 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. The example is not meant to limit the possibilities of the test fixture and instrumentation design in any way. Whatever design is used, the resulting instrumentation should be correlated to those made with a Charged Plate Monitor (CPM) and procedures as described in ANSI/ESD STM3.1. Refer to Annex B for procedures used to develop the correlation factors between the CPM and the smaller test fixture.
The example test fixture consists of an isolated conductive plate separated from a ground plate on insulative standoff(s). Additional instrumentation is used to charge the isolated conductive plate and monitor the voltage (see Figure 1). In this example, the isolated conductive plate is 2.54 cm x 2.54 cm (1 inch x 1 inch) with an approximate capacitance of 3 pF when mounted in the test fixture without electrical hookups (see Figure 2).ANSI SP3.4 pdf download.