TECHNICAL BULLETIN VER-29210 Dual Operator Continuous Monitor with Satellites Made in the Operation, Installation and Maintenance United States of America The Dual Operator Workstation Continuous Monitor is a real time instrument that ensures that critical ESD control components in a sensitive area are effectively grounded. It independently monitors the operator and the surface. The instant an operators wrist strap or cord fails, the monitor will issue audible and visual alarms alerting the user of the problem. In the same manner, the unit also confirms that a 7 path to ground of less than 10 megohms (1 x 10 ohms) exists from the ESD protective worksurface(s). All Vermason single-wire monitors with wave distortion Figure 1. Vermason VER-28681 Dual Operator Continuous technology include the Park Snap feature. Use the Park Snap to store the operators wrist cord and enable standby Monitor with Satellites mode while the operator is away from the workstation. Description Before disconnecting the coil cord from the wristband, the Leading companies use continuous monitors as a cost operator touches the Park Snap to disable the audio alarm effective component in satisfying the clause 5.2.3 Compliance for 6 seconds. Within the 6 second period, the operator can Verification Plan requirements of EN61340-5-1 Edition 1.0 disconnect their wrist cord from their wristband and attach it to 2007-08. The Vermason Dual Operator Continuous Monitor the Park Snap before the audible alarm sounds. with Satellites continuously monitors the grounding integrity of ADVANTAGES OF CONTINUOUS MONITORING two operators, and two ESD working surfaces path to ground. OVER PERIODIC TESTING The monitor will provide instantaneous notification of static Many customers are eliminating periodic touch testing of wrist control equipment failures, and eliminates the need of costly straps and are using continuous monitoring to better ensure and difficult to supervise wrist strap logging record keeping. that their products were manufactured in an ESD protected This unit is highly cost effective as it is designed to monitor any environment. Full time continuous monitoring is superior to conventional single-wire wrist strap and ground cord system. periodic or pulsed testing, and can save a significant amount Per ESD Handbook TR 20.20 paragraph 5.3.2.4.4 Test of money in testing costs and rejected product. Periodic testing Frequency, Because wrist straps have a finite life, it is detects wrist strap failures after ESD susceptible products have important to develop a test frequency that will guarantee been manufactured. The costs of dealing with the resulting integrity of the system. Typical test programmes recommend catastrophic failures or latent defects can be considerable. that wrist straps that are used daily should be tested daily. Dual Operator Workstation Continuous Monitors eliminate the However, if the products that are being produced are of such need for users to test wrist straps and log the results by their value that knowledge of a continuous, reliable ground is function, these monitors satisfy the ISO and ANSI/ESD S20.20 needed, then continuous monitoring should be considered or test logging. even required. A properly grounded wrist strap will keep a persons body The Dual Operator Continuous Monitor with Satellites is voltage to approximately + 10 V. The main advantage to a available in the following models: constant or continuous monitor is the immediate indication that the employee receives if the wrist strap falls open. With an unmonitored system, the employee will not be aware of a wrist Item Power Adapter Snap Stud strap failure until the start of the next shift. This has reliability Input Size benefits for an ESD program as it might help reduce or VER-28681 220VAC 4mm eliminate ESD damage. There are also other process benefits VER-29210 220VAC 10mm from using constant monitors such as the elimination of the need to maintain daily test logs and a reduction in the time for The Dual Operator Continuous Monitor with Satellites is a employees to make the daily test. For units that also monitor single-wire impedence continuous monitor designed to monitor the connection of a worksurface to protective earth, it is also body types from a 5th percentile female to a 95th percentile possible to reduce or eliminate the checking of the worksurface male. This range covers a 5 foot tall 90 pound person to a 6 as part of the periodic audit of the process. Constant monitors foot 5 inch 250 pound person in any production environment.* might be implemented by an organisation due to high The monitor is powered by a 220 VAC, 60/50 Hz, plug-in reliability requirements imposed by customers. CLC/TR transformer which also provides connection to ground. 61340-5-2:2008 User guide Annex B.1.3 Constant monitors No user adjustment required: The Continuous Monitor is WAVE DISTORTION DETECTION TECHNOLOGY drift-free and designed to be insensitive to the effects of PROVIDES TRUE 100% CONTINUOUS MONITORING squeezing or stretching the coil cord. It requires no user From the technical alternatives available, Vermason designs adjustment. and manufactures many of its Continuous Monitor product offerings using wave distortion technology . Wave distortion UNITUNIT C, 4TH DIMENSION, FOUR C, 4TH DIMENSION, FOURTH TH AAVENUE, LETCHWORVENUE, LETCHWORTH, HERTH, HERTS, SG6 2TD UKTS, SG6 2TD UK Phone: 0044 (0) 1462 672005, Fax: 0044 (0) 1462 670440 E-mail: Phone: 0044 (0) 1462 672005, Fax: 0044 (0) 1462 670440 E-mail: Service VService Vermason.co.ukermason.co.uk, Internet: , Internet: VVermason.co.ukermason.co.uk 2016 Vermason VER-29210 March 2016 Page 1 of 5circuitry monitors current/voltage phase shifts and provides installation. The miniscule amount of electrical current (less true 100% continuous monitoring. Electrical current will lead than 1 volt coil cord signal) required to generate the waveform voltage at various points due to the combinations of resistance has never caused reported skin irritation and is extremely safe and capacitive reactance. By monitoring these distortions for use in voltage sensitive applications such as disk drive or phase shifts, the wave distortion Workstation Continuous manufacturing. Monitor will reliably determine if the circuit is complete. Wave distortion technology can be referred to as vector Packaging impedance monitoring. This description is valid as the 1 Dual Operator Continuous Monitor wave distortion technology measures the impedance at the 2 Satellite Remotes (VER-28681 contains 4mm snap monitored banana jack and looks for changes in either the studs, VER-29210 contains 10mm snap studs) capacitance or resistance of the circuit which includes the wrist 1 Power Adapter strap and its wearer. It uses filtering and time domain sampling 2 Mat Monitor Cords (Black), 1.8m to filter out false signals caused by voltage offsets, 60 Hz fields 2 Mat Ground Cords (Green and Yellow), 1.8m and other electro-magnetic and electrostatic interference. 2 Satellite Remote Cables, 2.1m 4 Push and Clinch Snaps In normal factory environments, and with persons whose 4 Countersink Washers capacitance with respect to ground is within design limits (5 6 Screws feet tall 90 pound person to 6 foot 5 inch 250 pound person), 1 Certificate of Calibration the Dual Operator Workstation Continuous Monitor cannot be fooled. It will provide a reliable alarm only when the wrist strap or worksurface becomes dysfunctional or unsafe Installation according to accepted industry standards. The Dual Operator Remove the monitor and satellites from its packaging. Inspect Workstation Continuous Monitor is drift-free and designed to for any shipping damage. Confirm that the worksurface is be insensitive to the effects of squeezing or stretching the coil 7 1 x 10 ohms or less and has a conductive layer such as cord. Dual Layer Rubber, Dissipative 3-Layer Vinyl, or Micastat Dissipative Laminate with conductive buried layers. ADVANTAGES OF WAVE DISTORTION AND SINGLE-WIRE TECHNOLOGY The control unit for Dual Operator Continuous Monitor is The Vermason Dual Operator Workstation Continuous Monitor normally installed under the bench top toward the front edge allows the use of any standard, single-wire wrist strap and of a workstation where the LEDs are easily visible. Use the coil cord. The monitor/wrist strap/cord system life-cycle costs enclosures flanges to mount the monitor. are by far lower than alternative systems which require more expensive & less durable dual-wire cords and special wrist straps. Dual-wire cords are expensive and are the weak link of the system. They are the most likely component to need replacement. Over a five year period this can make a dual-wire system three times as expensive as a system using single-wire wrist straps and cords. The dictionary defines constant as uniform and unchanging, and continuous as uninterrupted. Although Vermason dual-wire resistance monitors use a continuous current, some dual-wire Screws resistance monitors use a pulsed test current and do not really provide continuous monitoring. For example, during each 2.2 second pulse cycle of a leading constant resistive monitor, electrical current is pulsed for only 0.2 seconds Figure 2. Mounting the monitor followed by an unmonitored interval of 2 seconds. This leaves the user/wrist strap unmonitored for over 90% of each cycle. Damaging ESD events can easily occur in the portion of the time in between the pulses. The off period of 2 seconds equals 2 billion nanoseconds, and it takes only about 25 volts applied for 100 nanoseconds to blow most memories or microprocessor.* The dual-wire system does not meet all industry ESD S6.1 specifications, as the cords do not meet the EOS/ESD Association guidelines for the 5 to 25N breakaway force requirement for ensuring a reliable path-to-ground and preventing accidental disconnects. By using the reliable wave distortion technology to determine if the circuit is complete, there are no false alarms. There is no need to adjust or tune the monitor to a specific user or Figure 3. Typical setup of the Dual Operator Continuous *1981 article by Donald E. Frank - Electrical Overstress Electronic Monitor and Satellites Discharge Symposium Proceedings UNIT C, 4TH DIMENSION, FOURTH AVENUE, LETCHWORTH, HERTS, SG6 2TD UK Phone: 0044 (0) 1462 672005, Fax: 0044 (0) 1462 670440 E-mail: Service Vermason.co.uk, Internet: Vermason.co.uk 2016 Vermason VER-29210 Page 2 of 5