Desco 19239 Installation, Operation And 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. The Mini Monitor eliminates the need for
periodic testing and record keeping of wrist straps.
The Mini Monitor is designed with Wave Distortion
Technology which provides 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 serves as a ground point for an ESD
worksurface and monitors for a path-to-ground of less
than 500 megohms. All Mini Monitors are calibrated to
NIST standards and include a certificate.
TB-3072 Page 1 of 4 April 2017
TECHNICAL BULLETIN TB-3072
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 sine wave that the monitor circuit compares
to established patterns. By monitoring the "distortions",
or shape of the sine 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 (<50
milliseconds) 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
19239 Mini Monitor, Black, North America
19242 Mini Monitor, Blue, with Jewel® Wrist Strap,
North America
19243 Mini Monitor, Black, 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
98220 Calibration Unit, for Wave Distortion Monitors
Packaging
1 Mini Monitor
1 09100 Jewel® Elastic Wrist Strap (19242 only)
2 Push and Clinch Snaps
1 Power Adapter, 24VDC
1 Certificate of Calibration
Made in the
United States of America
Desco.com
© 2017 DESCO INDUSTRIES, INC.
Employee Owned