Desco Mini Monitor Installation Operation & Maintenance

Mini Monitor
Installation, Operation and Maintenance
Figure 1. Desco Mini Monitor
Description
The Desco Mini Monitor is a single workstation
continuous monitor. It continuously monitors the
path-to-ground integrity of one operator and one ESD
worksurface. Its illuminated enclosure makes the status
of the operator and worksurface highly visible to the
operator and supervisor. Use the Desco 19344 Ring
Magnets when mounting the monitor in areas without a
worksurface.
The Mini Monitor is designed with Wave Distortion
Technology to provide stable continuous monitoring
of the path-to-ground and presence of 1 megohm
resistance of an operator's wrist strap. Audio and visual
alarms activate (in less than 50 milliseconds) when the
operator unintentionally disconnects from the monitor
or the wrist strap connection points are intermittent.
The Mini Monitor also monitors for a worksurface
path-to-ground of less than 10 megohms. All Mini
Monitors are calibrated to NIST standards.
TB-3098 Page 1 of 6 May 2024
TECHNICAL BULLETIN TB-3098
DESCO WEST - 3651 Walnut Avenue, Chino, CA 91710 • (909) 627-8178
DESCO EAST - One Colgate Way, Canton, MA 02021-1407 • (781) 821-8370 • Website:
Wave Distortion Technology is the Most Reliable
Technology for the Continuous Monitoring of
Single-Wire (Conductor) Wrist Straps
"Wave Distortion" or vector impedance works by
applying a continuous test voltage of 1.2 volts
peak-to-peak at 1 to 2 microamperes (0.000002
amperes) to the wrist strap that is connected to the
continuous or constant monitor. The test voltage creates
a square wave that the monitor circuit compares to
established patterns. By monitoring the "distortions", or
shape of the square wave, Wave Distortion Technology
determines if the monitored circuit is complete - the
operator is in the circuit and the total equivalent DC
resistance is within specifications. Wave Distortion
Technology produces a very fast alarm time and
minimal false alarms.
ANSI/ESD S20.20 section 7.3 states "Compliance
verification records shall be established and maintained
to provide evidence of conformity to the technical
requirements." Per ANSI/ESD S1.1 Annex A.3 Daily
(wrist strap system) testing may be omitted if constant
monitoring used." Per ESD Handbook ESD TR 20.20
section 5.3.2.4.4 "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."
The Mini Monitor and its accessories are available as
the following item numbers:
Item Description
19341 Mini Monitor,
with North American Power Adapter
19342 Mini Monitor,
with Universal Power Adapter
19344 Ring Magnets, 1 Pair
98221 Wave Distortion Monitor Verification Tester
19657 Power Adapter, 100-240 VAC Input, 9 VDC
150 mA Output, North America Plug
19658 Power Adapter, 100-240 VAC Input, 9 VDC
3 A Output, IEC C14 Inlet
50545 Power Cord, Europe
50546 Power Cord, UK
Made in the
United States of America
Desco.com
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Employee Owned