WAVE DISTORTION
DETECTION TECHNOLOGY
PROVIDES TRUE 100%
CONTINUOUS MONITORING
From all the technical alternatives
available, ESD Systems.com has
chosen wave distortion technology for
many of its Continuous Monitor
product offerings. 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 Real Time Continuous
Monitor will reliably determine if the
circuit is complete.
Wave distortion technology is
sometimes known as “impedance
monitoring”. This description is valid
as the wave distortion technology
measures the impedance at the
monitored banana jack and looks for
changes in either the capacitance or
resistance of the circuit which
includes the wrist strap and its wearer.
It uses filtering and time domain
sampling to filter out false signals
caused by voltage offsets, 60 Hz fields
and other electro-magnetic and
electrostatic interference.
In normal factory environments, and
with persons whose impedance to
ground are within design limits (5 feet
tall 90 pound person to 6 foot 5 inch
250 pound person), the Workstation
Real Time Continuous Monitor cannot
be “fooled”. It will provide a reliable
alarm only when the wrist strap or
work surface becomes dysfunctional
or unsafe according to accepted
industry standards. The Workstation
ADVANTAGES OF
WORKSTATION CONTINUOUS
MONITORING OVER PERIODIC
TESTING
Many customers are eliminating
periodic testing and are utilizing
workstation continuous monitoring to
better ensure that their products were
manufactured in an ESD controlled
environment. Full time workstation
continuous monitoring is superior to
pulsed monitoring as well as periodic
testing, and can save a significant
amount of money in testing costs and
rejected product. Periodic testing
detects failures after ESD sensitive
products have been manufactured.
The costs of dealing with the resulting
catastrophic or latent defects can be
considerable. Workstation Real Time
Continuous Monitors eliminate the
need for users to test wrist straps and
log the results; by their function, these
monitors satisfy the ISO 9000 test
logging requirement.
PS-2076
7/06 Page 1 of 4
Workstation Real Time Continuous Monitor
Operation, Installation and Maintenance
Figure 1. ESD Systems.com 41116 Workstation Real Time Continuous Monitor
Description
ESD Systems.com Workstation Real
Time Continuous Monitor, Item
41116, continuously monitors both the
operator and the work surface. This
unit provides continuous monitoring
of one user wearing a wrist strap and
also functions to ensure the grounding
integrity of ESD safe work surfaces.
This device will continuously monitor
the user until the wrist strap or the
cord fails, at which point the monitor
will issue an audible signal notifying
the user of a problem. The monitor
also verifies whether an outlet ground
is good. When plugged in, the unit
automatically runs a self-test. If the
outlet is wired incorrectly, both red
LEDs turn on and the alarm sounds.
The unit will also ground a second
user or supervisor.
The model 41116 operates on 120
VAC, 50/60 Hz.
Tech Brief
Made in America
© 2006 DESCO INDUSTRIES INC.
Employee Owned
432 NORTHBORO ROAD CENTRAL • MARLBORO, MA 01752 • PHONE (508) 485-7390 • FAX (508) 480-0257 • http://www.esdsystems.com
