TECHNICAL BULLETIN TB-20686 SPI Ground Gard 5 / 5.5 Made in the United States of America Operation, Installation, and Maintenance S1.1 paragraph 6.1.3 Frequency of Functional Testing Daily (Wrist Strap) testing may be omitted if constant monitoring is used. Because wrist straps have a finite life, it is important to develop a test frequency that will guarantee integrity of the system. Typical test programs recommend that wrist straps that are used daily should be tested daily. However, if the products that are being produced are of such value that knowledge of a continuous, reliable ground is needed, and then continuous monitoring should be considered or even required. (ESD Handbook TR 20.20 section 5.3.2.4.4) SPI-20686 94391 The SPI-20686 and 94391 will alarm if preset values are exceeded for capacitance, high resist and ground loss conditions. The grounding system is redundant and will Figure 1. SPI Ground Gard items SPI-20686 and 94391. still provide a limited grounding even if the utility ground is lost and the system is in an alarm state. Description The SPI-20686 and 94391 are wrist strap and ground Capacitance Type Continuous Monitors monitoring devices for the electronics work station. It is These types of monitors are used with a single wire designed to constantly monitor two single wire wrist (single conductor) wrist strap. Monitors in this category straps using a Remote Operator Module for each user. operate by sensing body capacitance. For capaci- tance monitors, an AC voltage is applied to the wrist These units provide continuous monitoring of: strap through the single conductor ground cord. Due to One or two users wearing a wrist strap capacitive coupling of the person to ground based on the Ground (Verification between electrical and ESD surroundings, the monitor will indicate either good or bad ground) depending on the manual adjustment or preset tolerance. Since a capacitor or capacitive network Leading companies use continuous monitors as a cost responds like a resistor to an AC current, the single effective component in satisfying the paragraph 6.1.3 conductor wrist strap monitor only provides an estimate Complicance Verification Plan requirements of ANSI/ of the wrist strap wearers apparent resistance. ESD S20.20. The SPI-20686 and 94391 Continuous (ESD Handbook TR 20.20 section 5.3.9.2 Types of Monitors provide continuous monitoring of two operators Continuous Monitors) and also functions to ensure connection to ground. If the monitor, using capacitance technology, detects improper Packaging grounding of the operator, the monitor will issue an Item SPI-20686 audible alarm along with an illuminated red LED to notify 1 Ground Gard 5.5 Monitor the user of a problem. 2 94340 Remote Operator Modules 2 10 Foot Phone Cords Many customers are eliminating periodic testing and are 1 12 Foot Ground Cord utilizing continuous monitoring to better ensure that their 1 Velcro Set products were manufactured in an ESD controlled 4 Screws environment. Continuous monitoring is superior to 1 Power Adapter - 3 Prong, 12 Volts periodic testing. While effective at the time of testing, wrist strap checker use is periodic. The failure of a wrist Item 94391 strap between checks may expose products to 1 Groud Gard 5 Monitor damage from electrostatic charge. If the wrist strap 2 94340 Remote Operator Modules system is checked at the beginning of a shift and 1 Power Adapter - 2 Prong, 12 Volts subsequently fails, then an entire shifts work could be 2 Remote Operator Cables suspect. (ESD TR 12-1 Section 1.0 Survey of Constant 1 Black Ground Cord Monitors for Wrist Straps) 1 Green ground Cord 2 Velcro Strips Continuous Monitors eliminate the need for users to test 4 Screws wrist straps and log the results by their function, these 1 Certificate of Calibration monitors satisfy the ISO 9000 and ANSI/ESD S20.20 Paragraph 6.2.2.2 test logging requirements. Per ESD- ESD Systems.com 432 Northboro Road Central Marlboro, MA 01752 (508) 485-7390 Website: ESDSystems.com ESD Systems.com 432 Northboro Road Central Marlboro, MA 01752 (508) 485-7390 Fax (508) 480-0257 Website: ESDSystems.com 2016 DESCO INDUSTRIES INC. TB-5545 Page 1 of 4 Revision May 2009 TB-20686 February 2016 Page 1 of 3 Employee Owned 2009 DESCO INDUSTRIES INC. Employee OwnedInstallation Calibration Procedure Using 94373 1. SPI-20686 and 94391 Monitor Head: Tester The SPI-20686 and 94391 Monitors are designed to Testing the Remote Modules maximize valuable work area and should be mounted at Refer to Figure 2 to see the connection setup for the eye level above the workstation, either on a post or shelf 94373 tester to the SPI-20686 and Figure 3 for the support. A double-sided adhesive Velcro attachment is 94391 monitor. Make sure that the switch located on the provided to hold the lightweight head in place. face of the tester is toggled to LEFT WS / RIGHT WS. If connected properly, all three LEDs on the monitor should 2. GROUND CONNECTION: be illuminated green. The green wire extending from the monitor must be attached to a facility ground. Caution: The total amount of resistance through all monitored parts should not exceed 10.0 megohms SPI-20686 total. 3. REMOTE OPERATOR MODULES: The remote operator modules can be mounted at the front of the work surface, usually under the tabletop and flush with the front edge. Two screws for each unit are provided for mounting. Remote Remote Connect each remote to the monitor unit using the telephone cable with RJ11 connectors. 4. POWER UP TEST 94373 After installing the Monitor , remote units, and making the necessary connections without the wrist straps connected, the unit should POWER UP with the wrist strap LEDs OFF and the audible alarm SILENT. If you have no response to power or a red LED, check AC outlet for proper ground or refer to trouble shooting section. Figure 2. Connecting the SPI-20686 to the 94373 Tester. PARK SNAP The audible alarm is designed to alert both operator and supervisor. The Park Snap feature provides a means for an operator to disconnect when normally leaving the work area, without the audible alarm sounding, and it 94391 provides a means of wrist cord storage. You may also disconnect the coil cord by unplugging the banana plug from the Remote Module. Both a 7mm and 4mm Park Snap is provided on each module. Remote Module Description Inside both remote modules are infrared sensors that react to the insertion of a wrist strap wire with a banana Remote Remote plug. When the banana plug is inserted, the base unit is activated for that remote module. The Monitor LED for the left or right wrist strap will light showing the condition 94373 of that strap. If correct, the LED should be GREEN. Should the wrist strap fail, be worn incorrectly or removed by the operator, the red indicator will flash, calling attention to a problem. Should the ground connection be lost, the red light and alarm will be activated. The monitors are continuous and even a momentary break will cause alarms. The remote Figure 3. Connecting the 94391 to the 94373 Tester. modules are set at the factory to allow for sensitivity of the average human body model. ESD Systems.com 432 Northboro Road Central Marlboro, MA 01752 (508) 485-7390 Website: ESDSystems.com ESD Systems.com 432 Northboro Road Central Marlboro, MA 01752 (508) 485-7390 Fax (508) 480-0257 Website: ESDSystems.com 2016 DESCO INDUSTRIES INC. TB-5545 Page 2 of 4 Revision May 2009 TB-20686 Page 2 of 3 Employee Owned 2009 DESCO INDUSTRIES INC. Employee Owned