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-3050 Page 1 of 4

© 2013 DESCO INDUSTRIES, INC.

Employee Owned

Operation, Installation and Maintenance

Description

independently monitors the operator and the

worksurface. The instant an operator’s 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 500 megohms exists from the ESD

worksurface.

Conductor Impedance Sensing Continuous Monitor

which per ESD Handbook TR20.20 section 5.3.9.2.1 “a

small AC voltage is used in a detection circuit designed

to eliminate false alarms and adjustment. They use the

phase difference between current and voltage to detect

changes in impedance of the grounding cord, wristband

and person. No adjustments are required.”

Per ESD Handbook ESD TR20.20 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 monioring should be considered or

even required.”

Advantages Of Continuous Monitoring

Over Periodic Testing

“When considering constant [or continuous] monitors,

the equipment cost including the wrist strap,

maintenance and training cost, labor time for performing

wrist strap tests, and the potential failures due to non-

functional wrist straps should be considered.

TECHNICAL BULLETIN TB-3050

April 2013

Mini Monitor

A broken wrist strap may expose products to ESD

over an entire shift if it is checked only at shift change

with wrist strap checker.” (ESD TR 12-01 Section 4.2

Selection Considerations)

the need for periodic wrist strap tests and logging.

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 failures after ESD susceptible products way

have been manufactured. The costs of dealing with

the resulting catastrophic or latent defects can be

Monitors eliminate the need for operaters to test wrist

straps and log the results; by their function, these

monitors satisfy the ISO 9000 and ANSI/ESD S20.20

test logging. ANSI/ESD S20.20 Section 6.2.2.2

Personnel Grounding Guidance states “A log should be

maintained which verifies that personnel have tested

their personal grounding devices.” Per ANSI/ESD-S1.1

Annex A Section 6.1.3 “Daily (wrist strap system) testing

may be omitted if constant monitoring is used.” Per

ANSI/ESD-S1.1 Annex A Frequency of Functional

Testing, “The wrist strap system should be tested daily

to ensure proper electrical value. Daily testing may be

omitted if constant monitoring is used.”

Park Snap

The audible alarm is designed to alert both operator and

supervisor. The Park Snap feature provides a means

for an operator to disconnect when normally leaving

the work area, without the audible alarm sounding, and

wrist cord storage (visual red LED will illuminate). When

the operator touches the Park Snap, the audible alarm

is disabled for about 8-10 seconds. The operator can

remove the wrist strap cord and attach socket of the

cord to Park Snap for storage. The coil cord may also

the alarm sounding. Once the coil cord is in the park

position, the operator ground status light will remain red.

Wave Distortion Detection Technology

Provides True 100% Continuous Monitoring

Wave distortion impedance 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”

Monitor will reliably determine if the circuit is complete.

Made in the

United States of America