TECHNICAL BULLETIN TB-3060 Full-Time Continuous Monitor Installation, Operation and Maintenance Made in the United States of America ADVANTAGES OF WORKSTATION CONTINOUS MONITORING OVER PERIODIC TESTING Many customers are eliminating periodic testing and are utilizing workstation continuous monitoring to better ensure that their products were manufactured in an ESD controlled environment. Full time workstation continuous monitoring is superior to pulsed monitoring as well as periodic testing, and can save a significant amount of money in testing costs and rejected products. Periodic testing detects failures after ESD susceptible products have been manufactured. The costs of dealing with the resulting catastrophic or latent defects can be considerable. Full Time Continuous Monitors eliminate the need for users to test wrist straps and log the results; by their function, these monitors satisfy the ISO 9000 and ANSI/ESD S20.20 Paragraph 6.2.2.2. test logging requirements. Per ESD-S1.1 paragraph 6.1.3 Frequency Figure 1. Desco Full-Time Continuous Monitor of Functional Testing “Daily (Wrist Strap) testing may be omitted if constant monitoring is used.” Description Per ESD Handbook TR 20.20 paragraph 5.3.2.4.4 Test Leading companies use continuous monitors as a cost Frequency “Because wrist straps have a finite life, it is effective component in satisfying the paragraph 6.1.3 important to develop a test frequency that will guarantee Compliance Verification Plan requirements of ANSI/ integrity of the system. Typical test programs recommend ESD S20.20. The Desco Full Time Continuous Monitor that wrist straps that are used daily should be tested daily. provides 100% monitoring of both the operator and the work However, if the products that are being produced are of surface. This unit provides continuous monitoring of: such value that knowledge of a continuous, reliable ground • One user wearing a wrist strap is needed, and then continuous monitoring should be • ESD worksurface considered or even required.” • Ground • AC outlet WAVE DISTORTION DETECTION TECHNOLOGY PROVIDES TRUE 100% CONTINUOUS MONITORING Note: Worksurface must have a conductive layer such as Desco utilizes wave distortion technology for the Full Time Dual Layer Rubber, Dissipative 3-Layer Vinyl or Micastat® Continuous Monitor, which is an Impedance type monitor. Dissipative Laminate with conductive buried layers. Desco Per ESD TR12-01 section 2.2 Impedance (or single wire) Continuous Monitors are not recommended for use with constant monitors “The capacitance type of monitor is homogeneous matting. also known as an impedance monitor. They both work on If the unit detects that the elements are outside industry the same theory, however the impedance monitor uses standards, the continuous monitor will alarm woth both an a detection circuit designed to reduce false alarms and audible alarm and an illuminated red LED to notify the user eliminate adjustments. ‘Single Wire’ or ‘impedance type’ of a problem. monitors use the phase difference between current and voltage to detect changes in impedance of the cord, band Unlike many units, the Full Time Continuous Monitor also and person. A very low AC voltage is used for constant continuously verifies ground (AC outlet ground). When the sensing. Any standard wristband and coiled cord can be Power Cord is plugged in, a self-test runs automatically. used.” If the AC outlet is wired incorrectly, both red LEDs will illuminate and the audible alarm will sound. The unit has an Thus the wave distortion circuitry monitors current/voltage additional ground point for a user or supervisor. phase shifts and provides true 100% continuous monitoring. Electrical current will lead voltage at various points due to The Full Time Continuous Monitor is available in two the combinations of resistance and capacitive reactance. models: By monitoring these “distortions” or phase shifts, the wave distortion Full Time Continuous Monitor will reliably determine Item Input Voltage Power Cord if the circuit is complete. 19325 120VAC North America 19326 220VAC United Kingdom 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 TB-3060 Page 1 of 5 May 2019 © 2019 DESCO INDUSTRIES INC Employee Owned

Wave distortion technology can be referred to as “vector Packaging impedance monitoring”. This description is valid as the 1 Full-Time Continuous Monitor wave distortion technology measures the impedance at the 1 Power Cord monitored banana jack and looks for changes in either the 1 Mat Monitor Cord (Black) capacitance or resistance of the circuit which includes the 1 Ground Cord (Green and Yellow) wrist strap and its wearer. It uses filtering and time domain 2 Countersunk Washers sampling to filter out false signals caused by voltage offsets, 2 Flat Head Screws, 6-32 x 1/4" 60 Hz fields and other electro-magnetic and electrostatic 1 Hook and Loop Fastener Strip interference. 1 Certificate of Calibration In normal factory environments, and with persons whose Features and Components capacitance with respect to ground is within design limits (5 feet tall 90 pound person to 6 foot 5 inch 250 pound person), A B CD the Full Time Continuous Monitor cannot be “fooled”. It will provide a reliable alarm only when the wrist strap or work surface becomes dysfunctional or unsafe according to accepted industry standards. The Full Time Continuous Monitor is drift-free and designed to be insensitive to the effects of squeezing or stretching the coil cord. E ADVANTAGES OF WAVE DISTORTION AND SINGLE-WIRE TECHNOLOGY The Desco Full Time Continuous Monitor allows the use of any standard, single-wire wrist strap and coil cord. The F monitor / wrist strap / cord system life-cycle costs are by far lower than alternative systems which require dual-wire cords and special wrist straps. Dual-wire cords are expensive and are the weak link of the system, the most likely component to need replacement. Over a five year period, this can make the dual-wire system three to five times as expensive as G H I a system utilizing single-wire wrist straps and cords. See Calibration section on page 4 to minimize life cycle costs. Figure 2. Full-Time Continuous Monitor features and The dictionary defines constant as uniform and unchanging, components and continuous as uninterrupted. None theless, some A. IEC Power Cord Inlet: Connect the power cord here. dual-wire resistance monitors utilize a pulsed test current and do not really provide continuous monitoring. For example, B. I/O Signal Output: Contact Desco Customer Service for during each 2.2 second pulse cycle of a leading “constant” more information resistive monitor, electrical current is pulsed for only 0.2 seconds followed by an unmonitored interval of 2 seconds. C. Monitored Ground Terminal: Grounds the worksurface This leaves the user/wrist strap unmonitored for over 90% of mat. Connect the green and yellow ground cord here. each cycle. Damaging static charges can easily occur in the D. Monitored Mat Terminal: Monitors the worksurface mat. portion of the time in between the pulses. The off period of Connect the black mat monitor cord here. 2 seconds equals 2 billion nanoseconds, and “it takes only about 25 volts applied for 100 nanoseconds to blow most E. Mat Ground LEDs: When the green LED is illuminated, memories or microprocessors”.* Some dual-wire systems do the worksurface mat is properly grounded. When the red not reliably meet all industry specifications, as the cords may LED is illuminated and the alarm sounds, the worksurface not meet the EOS/ESD S-1.0 paragraph 4.1.6 one to five mat is not properly grounded. pound “breakaway force” requirement for operator safety. F. Operator Ground LEDs: When the green LED is By using the reliable wave distortion technology to determine illuminated, the operator is properly grounded. When the if the circuit is complete, there are no false alarms. There red LED is illuminated and the alarm sounds, the operator is no need to adjust or tune the monitor to a specific user is not properly grounded. or installation. The miniscule amount of electrical current (less than 1 volt coil cord signal) required to generate the G. Auxiliary Ground: Unmonitored banana jack ground waveform has never caused reported skin irritation and is point. extremely safe for use in voltage sensitive applications such as disk drive manufacturing. 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 TB-3060 Page 2 of 5 © 2019 DESCO INDUSTRIES INC Employee Owned

H. 4mm Parking Snap: When touched by the operator, this snap will deactivate the alarm for six seconds. This allows time for the operator to disconnect the coil cord from the wrist band and park it on this snap. While parked, the coil cord disables the alarm, allowing the operator to leave the workstation. The OPERATOR GROUND LED will remain off while the cord is parked. Upon returning and removing the coil cord from the parking snap, the operator has six seconds to hook up to the wrist band before the alarm sounds. I. Monitored Operator Jack: Where the operator inserts the wrist cord plug. Must be 12-72" apart Installation Remove the monitor from its packaging and inspect for any shipping damage. Confirm that the worksurface is 10 megohms or less and has a conductive layer such as Dual Layer Rubber, Dissipative 3-Layer Vinyl, or Micastat® Dissipative Laminate with conductive buried layers. 1. Locate a nearby power outlet and test it for proper wiring and grounding. We recommend the Desco AC Outlet Analyzer to verify proper wiring and ground. 2. Connect the tinned wire termination of the Ground Cord Figure 3. Wiring the Full-Time Continuous Monitor to a to the GND terminal block on the monitor. worksurface mat 3. Connect the tinned wire termination of the Mat Monitor Cord to the MAT terminal block on the monitor. 50547 RELAY BOX 4. Determine the mounting location of the Full-Time Continuous Monitor. It is normally installed toward the front edge of a workstation where its LEDs can be visible to the operator. Use the included hook and loop strip if desired. 5. Use a blade to pierce two holes 12" to 72" apart from one another into the worksurface mat. 6. Use a Phillips screwdriver to secure the two flathead screws and countersunk washers through the worksurface mat and into the threaded 10mm snaps on the underside of the Mat Monitor Cord and Ground Cord. 7. Connect the power cord to the power inlet located on the Figure 4. EMIT 50547 Full-Time Continuous Monitor top-side of the Full-Time Continuous Monitor. Connect Relay Box the opposite end of the power cord to the tested AC outlet. The Full-Time Continuous Monitor can be equipped with the EMIT 50547 Relay Box to control electronic door locks, NOTE: Older revision Full-Time Continuous Monitors lights, buzzers, etc. The relay will activate when a failure is included push and clinch snaps instead of countersunk caught by the Full-Time Continuous Monitors. washers and flat head screws to secure the mat monitor cord and ground cord to the worksurface mat. Maximum Switching Current: 1A @ 30VDC or .3A @ 125VAC Contact Form: 2 Form C 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 TB-3060 Page 3 of 5 © 2019 DESCO INDUSTRIES INC Employee Owned

USING THE MONITOR 1. Plug a wrist strap cord, not attached to the wristband, into Input Jack the monitored banana jack labeled OPERATOR on the front of the unit. This automatically activates the selected operator channel. The red operator LED should illuminate, Normally Normally and the audible alarm will sound after the activation Closed Closed period. Common Common 2. Remove the charges from your body by making contact with a properly grounded ESD worksurface. Snap the cord to the wristband, and fit it snugly onto your wrist. Normally Normally This should silence the audible alarm and cause the Open Open OPERATOR GROUND LED to switch from red to green. If this does not happen, examine the wrist cord for Figure 5. Full-Time Continuous Monitor Relay Box continuity or damage and your wrist band to ensure features and components that it is securely fit. If you have dry skin, apply an approved dissipative hand lotion such as Menda 1. Remove the cover from the Relay Box. Reztore™ ESD Hand Lotion. When leaving the area, the user can take the wrist cord along or attach it to 2. Tie wire around the necessary contacts inside the Relay the monitor parking snap. The audible alarm will shut Box. off when operator wrist cord is removed from unit and or 3. Route the wire out the bottom of the Relay Box and when the cord is attached to the parking snap. close the cover. NOTE: Removing the banana plug from the monitor’s 4. Make the proper connections to your targeted device operator jack will disable the audible alarm. (light fixture, door lock, etc.). Use Figure 6 as a guide. PARKING SNAP 5. Power the Full-Time Continuous Monitor after installation All Desco single-wire monitors with wave distortion is completed. technology include the Park Snap feature. Use the Park Snap to store the operator’s wrist cord and enable standby mode while the operator is away from the workstation. Phone Cord Light Fixture Before disconnecting the coil cord from the wristband, the operator touches the Park Snap to disable the audio alarm for 6 seconds. Within the 6 second period, the operator can disconnect their wrist cord from their wristband and attach it Green Light to the Park Snap before the audible alarm sounds. Red Light WORKSURFACE CHANNEL The Full Time Continuous Monitor’s circuitry is sufficiently Relay Box sensitive to detect extremely low current when used with a worksurface with a conductive layer. 5-24V Note: The monitor will not detect insulative contamination Full-Time Power Supply Furnished on the worksurface. “Insulative contamination can increase Continuous Monitor with Light Fixuture the resistance to ground making the worksurface ineffective.” (ESD TR12-01 section 3.1 Worksurface monitors). ESD Figure 6. Installing the Relay Box and Full-Time worksurfaces should be kept clean using an approved ESD Continuous Monitor to a Light Fixture cleaner like Reztore™ Antistatic Surface & Mat Cleaner. When the monitor is connected to an ESD worksurface, Operation the amount of current that flows is a function of the total resistance between the Continuous Monitor and through When the Full-Time Continuous Monitor is installed to an the worksurface to ground. When the resistance of the ESD protective worksurface and grounded via a power worksurface is below a pre-set threshold, the monitor will cord, the green MAT GROUND LED and red OPERATOR indicate Pass. Conversely, if the resistance level is high GROUND LED should illuminate. The monitor takes 6 when compared to the monitor’s reference, the unit will fail seconds to activate its alarm circuitry when first powered. and alarm. This is an integrating resistance measuring circuit, • Correct wiring of the outlet is confirmed when the monitor therefore it is relatively insensitive to externally induced is plugged in. electromagnetic fields. The resistance threshold is factory set to 10 megohms. (It can be special ordered to other limits. • The worksurface resistance is measured between the two Contact manufacturer for specifications). snaps installed to the mat worksurface. 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 TB-3060 Page 4 of 5 © 2019 DESCO INDUSTRIES INC Employee Owned

Calibration Specifications Frequency of recalibration should be based on the critical Input Voltage and 100-120VAC, 50/60 Hz nature of those ESD sensitive items handled and the risk of Frequency failure for the ESD protective equipment and materials. In general, Desco recommends that calibration be performed Operating Temperature 50 to 95°F (10 to 35°C) annually. Environmental Indoor use only at altitudes less Requirements than 6500 ft. (2 km) Use the Desco 98221 Wave Distortion Monitor Verification Tester to perform periodic verification (once every 6-12 Maximum relative humidity months) of the Full-Time Continuous Monitor. The verification of 80% up to 85°F (30°C) tester can be used to check the test limits of the Full-Time decreasing linearly to 50% @ Continuous Monitor without removing it from the workstation. 85°F (30°C) Dimensions 4.38" L x 3.25" W x 0.89" H See TB-3074 for more information. (111 mm x 83 mm x 23 mm) Weight 0.26 lbs. (0.12 kg) Operator Test Range* 500 kilohms to 10 megohms impedance Worksurface Test Limit** 10 megohms (±20%) Operator Test Voltage 1.2V peak-to-peak @ 1.2µA, open circuit Worksurface Test 5 to 7.5V, open circuit Voltage Alarm Response Time <50 ms Country of Origin United States of America *This cannot be verified with standard DC test equipment. The continuous monitor is an impedance sensing device, and the limits are determined by the magnitude and angle of the impedance. **The worksurface mat must have a conductive layer such as Dual Layer Rubber or Dissipative 3-Layer Vinyl with conductive buried layers. Desco workstation monitors are not recommended for use with homogeneous matting. Figure 7. Desco 98221 Wave Distortion Monitor Verification Tester Limited Warranty, Warranty Exclusions, Limit of Liability and RMA Request Instructions See the Desco Warranty - Desco.com/Limited-Warranty.aspx 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 TB-3060 Page 5 of 5 © 2019 DESCO INDUSTRIES INC Employee Owned

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