TECHNICAL BULLETIN TB-3054 Multi-Mount Continuous Monitor Installation, Operation and Maintenance Made in the United States of America The Multi-Mount Monitor and its accessories are available as the following item numbers: Item Description 19228 Multi-Mount Monitor, North America 19229 Multi-Mount Monitor, with Jewel Wrist Strap, North America 19234 Multi-Mount Monitor, Universal Power Adapter 19236 Multi-Mount Monitor, with Jewel Wrist Strap, Universal Power Adapter 19258 Power Adapter, 100-240VAC Input, 24VDC 150mA Output, IEC Inlet 19260 Power Adapter, 100-240VAC Input, 24VDC 150mA Output, North America Plug Figure 1. Desco Multi-Mount Continuous Monitor 98220 Calibration Unit, for Wave Distortion Monitors Description WAVE DISTORTION DETECTION TECHNOLOGY PROVIDES TRUE 100% CONTINUOUS Leading companies use continuous monitors as a MONITORING cost effective component in satisfying the paragraph From all the technical alternatives available, Desco 6.1.3 Compliance Verification Plan requirements has chosen wave distortion technology for many of its of ANSI/ESD S20.20. The Desco Multi-Mount Continuous Monitor product offerings. Wave distortion Continuous Monitor continuously monitors the integrity circuitry monitors current/voltage phase shifts and of one operator. This monitor will provide virtually provides true 100% continuous monitoring. Electrical instantaneous notification of static control equipment current will lead voltage at various points due to the failures, eliminating the need of periodic testing and combinations of resistance and capacitive reactance. costly record keeping. This unit is highly cost effective By monitoring these distortions or phase shifts, the as it is designed to monitor any conventional single wire wave distortion Multi-Mount Continuous Monitor will wrist strap and ground cord system. Its small package reliably determine if the circuit is complete. and mounting tabs with holes make it highly suitable to install on most any equipment or work bench surface. Wave distortion technology can be referred to vector In addition, optional mounting is available using the impedance monitoring. This description is valid as the provided adhesive-backed Velcro strips. Using either wave distortion technology measures the impedance mounting method makes the Multi-Mount Monitor at the monitored banana jack and looks for changes suitable for most any machinery or workbench even in in either the capacitance or resistance of the circuit hard to reach locations. which includes the wrist strap and its wearer. It uses filtering and time domain sampling to filter out false The Multi-Mount Continuous Monitor is a real time signals caused by voltage offsets, 60 Hz fields and other instrument that ensures that critical ESD generators in a electro-magnetic and electrostatic interference. sensitive area are effectively grounded. The instant an operators wrist strap or cord fails, the monitor will issue In normal factory environments, and with persons audible and visual (LEDs) alarms alerting the user and whose capacitance with respect to ground is within supervisor of the problem. design limits (5 feet tall 90 pound person to 6 foot 5 inch 250 pound person), the Multi-Mount Continuous All Desco single-wire monitors with wave distortion Monitor cannot be fooled. It will provide a reliable technology include the Park Snap feature. Use the alarm only when the wrist strap becomes dysfunctional Park Snap to store the operators wrist cord and enable or unsafe according to accepted industry standards. standby mode while the operator is away from the The Multi-Mount Continuous Monitor is drift-free and workstation. Before disconnecting the coil cord from designed to be insensitive to the effects of squeezing or the wristband, the operator touches the Park Snap to stretching the coil cord. 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 to the Park Snap before the audible alarm sounds. 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 2017 DESCO INDUSTRIES, INC. TB-3054 Page 1 of 6 May 2017 Employee OwnedADVANTAGES OF WAVE DISTORTION AND WORKSURFACE CHANNEL SINGLE-WIRE TECHNOLOGY The Multi-Mount Continuous Monitors circuitry is The Desco Multi-Mount Continuous Monitor allows the sufficiently sensitive to detect extremely low current, use of any standard, single-wire wrist strap and coil allowing it to be used with mats having a resistance 7 cord. The monitor/wrist strap/cord system life-cycle of up to 1.0 x 10 ohms Rtg. When the Monitor is costs are by far lower than alternative systems which connected to an ESD Mat worksurface, the amount of require expensive & fragile dual-wire cords and special current that flows is a function of the total resistance wrist straps. Dual-wire cords are expensive and are between the monitor and through the worksurface to the weak link of the system, the most likely component ground. When the resistance of the worksurface is to need replacement. Over a five year period, this below a pre-set threshold, the monitor will indicate can make the dual-wire system three to five times as good. Conversely, if the resistance level is high when expensive as a system utilizing single-wire wrist straps compared to the monitors reference, the unit will alarm. and cords. See Maintenance and Calibration (page 4) This is an integrating resistance measuring circuit, to minimize life-cycle costs. therefore it is relatively insensitive to externally induced electromagnetic fields. The resistance threshold is The dictionary defines constant as uniform and factory set to 10 megohms. (It can be special ordered unchanging, and continuous as uninterrupted. to other limits. Limits can be varied and set to 100 None theless, some dual-wire resistance monitors megohms maximum). utilize a pulsed test current and do not really provide continuous monitoring. For example, during each 2.2 Packaging second pulse cycle of a leading constant resistive 19228 Multi-Mount Continuous Monitor, 120VAC monitor, electrical current is pulsed for only 0.2 seconds followed by an unmonitored interval of 2 seconds. 1 Multi-Mount Continuous Monitor This leaves the user/wrist strap unmonitored for over 1 24VDC Power Adapter, North America Plug 90% of each cycle. Damaging static charges can 1 6 Mat Monitor Cord (Black) easily occur in the portion of the time in between 1 6 Mat Ground Cord (Green and Yellow) the pulses. The off period of 2 seconds equals 2 2 Push and Clinch Snaps billion nanoseconds, and it takes only about 25 volts 2 Mounting Screws applied for 100 nanoseconds to blow most memories 2 Countersink Washers or microprocessors.* The dual-wire system does not 1 Set of Hook and Loop Fasteners reliably meet all industry specifications, as the cords 1 Zip Tie do not meet the EOS/ESD S-1.0 paragraph 4.1.6, 1 to 1 Certificate of Calibration 5 pound breakaway force requirement for operator safety. 19229 Multi-Mount Continuous Monitor, 120VAC 1 Multi-Mount Continuous Monitor By using the reliable wave distortion technology to 1 24VDC Power Adapter, North America Plug determine if the circuit is complete, there are no false 1 09100 Jewel Elastic Wristband alarms. There is no need to adjust or tune the monitor 1 6 Mat Monitor Cord (Black) to a specific user or installation. The miniscule amount 1 6 Mat Ground Cord (Green and Yellow) of electrical current (less than 1 volt coil cord signal) 2 Push and Clinch Snaps required to generate the waveform has never caused 2 Mounting Screws reported skin irritation and is extremely safe for use 2 Countersink Washers in voltage sensitive applications such as disk drive 1 Set of Hook and Loop Fasteners manufacturing. 1 Zip Tie 1 Certificate of Calibration 19234 Multi-Mount Continuous Monitor, 220VAC 1 Multi-Mount Continuous Monitor 1 24VDC Power Adapter without Power Cord 1 6 Mat Monitor Cord (Black) 1 6 Mat Ground Cord (Green and Yellow) 2 Push and Clinch Snaps 2 Mounting Screws 2 Countersink Washers 1 Set of Hook and Loop Fasteners 1 Zip Tie 1 Certificate of Calibration *1981 article by Donald E. Frank - Electrical Overstress / Electronic Discharge Symposium Proceedings 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 2017 DESCO INDUSTRIES, INC. TB-3054 Page 2 of 6 Employee Owned