TECHNICAL BULLETIN TB-3041 Ionization Test Kit Made in the Operation and Maintenance United States of America When any object becomes electrostatically charged, there is an electrostatic field associated with that charge. If an ESDS (ESD sensitive) device is placed in that electrostatic field, a voltage may be induced on the device. If the device is then momentarily grounded, a transfer of charge from the device occurs as a CDM (Charged Device Model) event. If the device is removed from the region of the electrostatic field and grounded again, a second CDM event will occur as charge (of opposite polarity from the first event) is transferred from the device. (Handbook ESD TR20.20 section 2.7.5 Field Induced Discharges) All nonessential insulators such as coffee cups, food wrappers and personal items shall be removed from the EPA. The ESD program shall include a plan for handling Figure 1. Desco 19493 Ionization Test Kit process-required insulators in order to mitigate field-induced CDM damage. Description If the field measured on the process required insulator The Desco Ionization Test Kit allows the 19492 Digital is greater than 2000 volts/inch and the process required Static Field Meter to be used to measure the offset insulator is less than 30 cm (12 inches) from the ESDS voltage (balance) and charge decay of ionization item, steps shall be taken to either: equipment. The Test Kit also includes a Charger used to place a 1000V charge on the 19441 Conductive Plate, A) Separate the required insulator from the ESDS item making it possible to also measure the discharge times by a distance of greater than 30 cm (12 inches) or of air ionization equipment per ANSI/ESD SP3.3 Periodic B) Use ionization or other charge mitigating techniques Verification of Air Ionizers. The 19493 Ionization Test Kit to neutralize the charge. includes the 19492 Digital Static Field Meter, providing a highly portable and cost effective means of verifying the If the field measured on the process required insulator performance of a wide variety of ionization equipment. is greater than 125 volts/inch and the process required insulator is less than 2.5 cm (1 inch) from the ESDS Note: The Digital Static Field Meter is designed to item, steps shall be taken to either: operate only with the 19493 Ionization Test Kit. It is not compatible with other brands. A) Separate the required insulator from the ESDS item by a distance of greater than 2.5 cm (1 inch) or Although not as accurate, the Desco Ionization Test Kit has been designed to make measurements that B) Use ionization or other charge mitigating techniques correspond to those made by using a charged plate to neutralize the charge. analyzer and ANSI/ESD S3.1. The Ionization Test Kit provides convenience and portability to test per ANSI/ NOTE: The accurate measurement of electrostatic fields ESD SP3.3 Periodic Verification of Air Ionizers or requires that the person making the measurement is Compliance Verification ESD TR53. We recommend familiar with the operation of the measuring equipment. the EMIT 50571 Charged Plate Analyzer if precise Most hand held meters require that the reading be taken measurements are required. at a fixed distance from the object. They also normally specify that the object has a minimum dimension of The Ionization Test Kit includes a slide-on isolated fixed size in order to obtain an accurate reading. (ANSI/ Conductive Plate, a 1000 volt Charger and a durable ESD S20.20-2014 section 8.3.1 Insulators) thermoplastic carrying case with custom cut-outs for all of the above components along with the Digital Static Field Meter. DESCO WEST - 3651 Walnut Avenue, Chino, CA 91710 (909) 627-8178 DESCO EAST - One Colgate Way, Canton, MA 02021-1407 (781) 821-8370 Website: Desco.com 2019 DESCO INDUSTRIES INC TB-3041 Page 1 of 6 June 2019 Employee OwnedA. Output Contact: The output contact is connected to Packaging an internal power source. When the touch plate located 1 Digital Static Field Meter underneath the unit is connected to ground, the output 1 Conductive Plate contact will provide a charge of the indicated polarity. 1 Charger The charger is designed so that an operator can press 2 9V Alkaline Batteries the rocker switch and touch the plate simultaneously 1 Carrying Case with the fingers of the same hand. 1 Certificate of Calibration B. Rocker Switch: Press and hold to select the polarity that will be provided at the Output Contact. Features and Components C. Touch Plate: Make contact with the touch plate while DIGITAL STATIC FIELD METER pressing down the rocker switch to provide voltage to the See technical bulletin TB-3040 for information on the Output Contact. The operator must be properly Digital Static Field Meter that is included in the 19493 grounded during use. Ionization Test Kit. D. Battery Compartment: Slide the cover down to open CHARGER the 9V battery compartment. A Operation TAKING OFFSET VOLTAGE (BALANCE) MEASUREMENTS The Ionization Test Kit has been designed to match the compact size and hand held convenience of the Digital Static Field Meter. Use the following procedure to verify the offset voltage (balance) of air ionization equipment. B This quick and easy procedure will help determine if the piece of ionization equipment is working within the manufacturers specifications or user requirements. It is extremely important that ionizers be checked regularly for offset voltage (balance) and discharge times. An ionizer operating in an out-of-balance state can place a charge on sensitive electronic FRONT VIEW components or assemblies. Note: The Digital Static Field Meter is built in a conductive case. The instrument senses the difference in potential between the case (and the person holding the case / ground connection) and the surface under test. Ensure that the person using the instrument is wearing a wrist strap and grounded to achieve more accurate measurements. C INSTALLING THE ISOLATED PLATE ASSEMBLY The Digital Static Field Meters case has two slots along its sides. The top slot is closest to the face of the instrument. Slide down the tabs of the Conductive Plate D plate into the top slot of the Meters case as far as they go (see Figure 3). BACK VIEW Figure 2. Charger features and components DESCO WEST - 3651 Walnut Avenue, Chino, CA 91710 (909) 627-8178 DESCO EAST - One Colgate Way, Canton, MA 02021-1407 (781) 821-8370 Website: Desco.com 2019 DESCO INDUSTRIES INC TB-3041 Page 2 of 6 Employee Owned