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-3058
Page 1 of 5
© 2013 DESCO INDUSTRIES, INC.
Employee Owned
Dual Operator Continuous Monitor
Installation, Operation and Maintenance
Description
Leading companies use continuous monitors as a cost
effective component in satisfying the section 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 ESD TR20.20 section 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 Desco Dual Operator Continuous Monitor is available in
the following models:
August 2013
Figure 1. Desco Dual Operator Continuous Monitor with
Satellites
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 worksurface.
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 10
7
ohms)
exists from the ESD protective worksurface(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.
TECHNICAL BULLETIN TB-3058
Made in the
United States of America
*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 evaluation,
requirements may be added, modified or deleted. Tailoring
decisions, including rationale, shall be documented in the ESD
Control Program Plan.”
Item
Power Adapter Input
19246
120VAC
19247
220VAC
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
19246
is powered by a 120 VAC, 60/50 Hz, plug-in
transformer which also provides connection to ground.
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.
