Desco 19246 Operation Installation And Maintenance

Dual Operator Workstation Continuous Monitor with
Satellites - Operation, Installation and Maintenance
Figure 1. Desco Dual Operator Continuous Monitor with
Satellites
Description
Leading companies use continuous monitors as a cost effective
component in satisfying the paragraph 6.1.3 Compliance
Verification Plan requirements of ANSI/ESD S20.20. The
Desco Dual Operator Continuous Monitor with Satellites
continuously monitors the grounding integrity of two operators,
and two ESD worksurfaces' path to ground. The monitor will
provide instantaneous notification of static control equipment
failures, and eliminates the need of costly and difficult to
supervise wrist strap logging record keeping. This unit is highly
cost effective as it is designed to monitor any conventional
single-wire wrist strap and ground cord system.
Per ESD Handbook TR 20.20 paragraph 5.3.2.4.4 Test
Frequency, "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, then continuous monitoring should be considered or
even required."
The Dual Operator Continuous Monitor with Satellites is
available in two models.
Model Voltage AC
19246 120 Volt
19247 220 Volt
19248 Satellite Remote Monitor
The Dual Operator Continuous Monitor with Satellites is an
impedance sensing device designed to monitor body types
from a 5th percentile female to a 95th percentile male. This
range covers a 5 foot tall 90 pound person to a 6 foot 5 inch
250 pound person in any production environment.* The
is powered by a 120 VAC, 60/50 Hz, plug-in transformer which
also provides connection to ground.
DESCO EAST - One Colgate Way, Canton, MA 02021-1407 • (781) 821-8370 • Fax (781) 575-0172 • Website:
TB-3058 November 2011 Page 1 of 4
TECHNICAL BULLETIN TB-3058
DESCO WEST - 3651 Walnut Avenue, Chino, CA 91710 • (909) 627-8178 • Fax (909) 627-7449
No user adjustment required: The Continuous Monitor
is drift-free and designed to be insensitive to the effects of
squeezing or stretching the coil cord. It requires no user
adjustment.
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 work 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
path to ground of less than 10 megohms (1 x 10E7 ohms)
exists from the ESD protective work surface(s).
ADVANTAGES OF CONTINUOUS MONITORING
OVER PERIODIC TESTING
Many customers are eliminating periodic touch testing of wrist
straps and are utilizing continuous monitoring to better ensure
that their products were manufactured in an ESD protected
environment. Full time continuous monitoring is superior to
periodic or pulsed testing, and can save a significant amount
of money in testing costs and rejected product. Periodic testing
detects wrist strap failures after ESD susceptible products have
been manufactured. The costs of dealing with the resulting
catastrophic failures or latent defects can be considerable.
Dual Operator Workstation Continuous Monitors eliminate the
need for users to test wrist straps and log the results; by their
function, these monitors satisfy the ISO and ANSI/ESD S20.20
test logging. ANSI/ESD S20.20 Paragraph 6.2.2.2 Personnel
Grounding Guidance states "A log should be maintained which
verifies that personnel have tested their personal grounding
devices." Per ESD-S1.1 Paragraph 6.1.3 "Daily (wrist strap
system) testing may be omitted if constant monitoring is used."
WAVE DISTORTION DETECTION TECHNOLOGY
PROVIDES TRUE 100% CONTINUOUS MONITORING
From the technical alternatives available, Desco designs
and manufactures many of its Continuous Monitor product
offerings using wave distortion technology . Wave distortion
circuitry monitors current/voltage phase shifts and provides
true 100% continuous monitoring. Electrical current will lead
voltage at various points due to the combinations of resistance
and capacitive reactance. By monitoring these "distortions"
or phase shifts, the wave distortion Workstation Continuous
Monitor will reliably determine if the circuit is complete.
*NASA Publication 1024-Anthropomorphic Source Book Volume 1:
"Anthropometry for Designers"
** Per ANSI/ESD S20.20 paragraph 6.0.3. Tailoring "This
document, or portions thereof, may not apply to all applica tions.
Tailoring is accomplished by evaluating the applicability of each
requirement for the specific application. Upon completion of the
19246 evaluation, requirements may be added, modified or deleted.
Tailoring decisions, including rationale, shall be documented in the
ESD Control Program Plan."
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United States of America
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