Desco 19651, 19652 Installation, Operation And Maintenance Manual

TECHNICAL BULLETIN TB-3073

Multi-Mount Monitor
Installation, Operation and Maintenance

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

Figure 1. Desco Multi-Mount Monitor

Description

The Desco Multi-Mount Monitor is a single workstation
continuous monitor. It continuously monitors the
path-to-ground integrity of one operator and one ESD
worksurface. Mounting tabs make it suitable to install in
workbench or equipment settings. Connect the 19653
Remote Alarm accessory to the Multi-Mount Monitor,

and place it in the operator's eld of view for increased

alarm visibility.

The Multi-Mount 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 Multi-Mount Monitor also monitors for
a worksurface path-to-ground of less than 10 megohms.
All Multi-Mount Monitors are calibrated to NIST
standards and include a certificate.

(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 Multi-Mount Monitor and its accessories are
available as the following item numbers:

Item Description

19651 Multi-Mount Monitor, North American Power

Adapter

19652 Multi-Mount Monitor, Universal Power Adapter

19653 Remote Alarm

19258 Power Adapter, 100-240VAC Input, 24VDC

150mA Output, IEC Inlet

19260 Power Adapter, 100-240VAC Input, 24VDC

150mA Output, North America Plug

98221 Wave Distortion Monitor Verification Tester

Made in the

United States of America

DESCO EAST - One Colgate Way, Canton, MA 02021-1407 • [phone] • Website: Desco.com

TB-3073 Page 1 of 7

September 2017

DESCO WEST - 3651 Walnut Avenue, Chino, CA 91710 • [phone]

© 2017 DESCO INDUSTRIES, INC.

Employee Owned

Packaging

19651 Multi-Mount Monitor, North America

1 Multi-Mount Monitor
1 Mat Monitor Cord (White)
1 Push and Clinch Snap
1 Countersunk Washer
1 Flat Head Screw, 6-32 x 1/4"
2 Pan-Head Screws, #6 x 3/8"
1 Dual Lock Fastener Set, 2" Length
1 Power Adapter, 24VDC, North America Plug
1 Certificate of Calibration

19652 Multi-Mount Monitor, Universal Power Adapter

1 Multi-Mount Monitor
1 Mat Monitor Cord (White)
1 Push and Clinch Snap
1 Countersunk Washer
1 Flat Head Screw, 6-32 x 1/4"
2 Pan-Head Screws, #6 x 3/8"
1 Dual Lock Fastener Set, 2" Length
1 10mm Interchangeable Park Snap
1 10mm Operator Jack Adapter
1 Power Adapter, 24VDC, IEC Inlet
1 Certificate of Calibration

Figure 3. Universal power adapter included with the
19652 Multi-Mount Monitor

Figure 2. North American power adapter included with
the 19651 Multi-Mount Monitor

NOTE: The power cord must be purchased separately
if ordering the 19652 Multi-Mount Monitor. The power
cords are available as the following item numbers:

Item Plug Type

50545 Europe

50546 United Kingdom

19653 Remote Alarm

1 Remote Alarm
1 Remote Cable, 7' Length
2 Pan-Head Screws, #6 x 3/8"
1 Dual Lock Fastener Set, 1" Length

DESCO EAST - One Colgate Way, Canton, MA 02021-1407 • [phone] • Website: Desco.com

DESCO WEST - 3651 Walnut Avenue, Chino, CA 91710 • [phone]

TB-3073 Page 2 of 7

Figure 4. Desco 19653 Remote Alarm

© 2017 DESCO INDUSTRIES, INC.

Employee Owned

Features and Components

Multi-Mount Monitor

A B

D

E

A. Mat Monitor Switch: Use a probe to access the

mini slide switch. Slide the switch to the right to enable
the mat monitor circuit. Slide the switch to the left to
disable the mat monitor circuit. This switch is enabled
as default.

B. Buzzer Volume Adjustment: Turn the trimpot
clockwise to increase the buzzer volume. Turn the
trimpot counter-clockwise to decrease the buzzer
volume.

C

C. Monitored Operator Jack: Insert the single-wire

wrist cord here to monitor the operator's connection to
ground.

D. Operator LEDs: Illuminates green when the
operator is properly grounded. Illuminates solid red and
audible alarm sounds when the operator is not properly
grounded.

E. Mat LEDs: Illuminates green when the worksurface
is properly grounded. Illuminates red and audible alarm
sounds when the worksurface is not properly grounded.

F. Park Snap: Allows the operator to disconnect (and
park) a wrist strap when leaving the workstation, without
creating a false alarm. Touch the park snap and the
monitor's audible alarm will disable for approximately 10
seconds. Use this time to disconnect the wrist cord from
the wristband, and attach it to the park snap or remove
the banana plug from the jack. Upon returning to the
workstation and disconnecting the wrist cord from the
park snap, the operator has approximately 10 seconds
to reconnect the wrist cord to a worn wristband before
activating the alarm.

F

G H I

Figure 5. Multi-Mount Monitor features and components

G. Mat Monitor Screw Terminal: Verifies that the
worksurface's path-to-ground is <10 megohms. Connect
the white mat monitor cord here.

H. Power Jack: Connect the included 24VDC power
adapter here.

I. Remote Alarm Jack: Connects to the 19653
Remote Alarm accessory.

DESCO EAST - One Colgate Way, Canton, MA 02021-1407 • [phone] • Website: Desco.com

DESCO WEST - 3651 Walnut Avenue, Chino, CA 91710 • [phone]

TB-3073 Page 3 of 7

© 2017 DESCO INDUSTRIES, INC.

Employee Owned

Remote Alarm

Installation

Use the at head screw and

countersunk washer to keep

the cord from disconnecting

from the worksurface mat

Remote Alarm

& cable are

purchased
separately

A

Mat Monitor Cord

Push & Clinch Snap

Grounded

Worksurface Mat

B C

Figure 6. Remote Alarm features and components

A. Multi-Mount Monitor Jack: Connects to the
Multi-Mount Monitor.

B. Operator LEDs: Illuminates green when the
operator is properly grounded. Illuminates solid red and
audible alarm sounds when the operator is not properly
grounded.

C. Mat LEDs: Illuminates green when the worksurface
is properly grounded. Illuminates red and audible alarm
sounds when the worksurface is not properly grounded.

Multi-Mount
Monitor

Power Adapter

Figure 7. Installing the Multi-Mount Monitor and Remote
Alarm accessory

1. Remove the Multi-Mount Monitor from the carton,
and inspect for damage.

2. Locate an appropriate AC outlet near the
Multi-Mount Monitor, and test it for proper wiring
and grounding prior to use. The Desco AC Outlet
Analyzer or similar test equipment may be used to
verify the outlet’s functionality. Use item number

98132 for 120VAC North American outlets and item

number 98131 for 220VAC UK outlets.

3. Determine the mounting location of the Multi-Mount
Monitor. Its LEDs should be visible to the operator.
Secure the Multi-Mount Monitor to a surface using
its mounting tabs and the included pan-head screws
or dual lock fasteners.

DESCO EAST - One Colgate Way, Canton, MA 02021-1407 • [phone] • Website: Desco.com

DESCO WEST - 3651 Walnut Avenue, Chino, CA 91710 • [phone]

TB-3073 Page 4 of 7

4. Secure the ring termination of the white mat monitor
cord to the mat monitor screw terminal on the side
of the Multi-Mount Monitor. Ensure that the mat
monitor switch is enabled if using this monitored
circuit.

© 2017 DESCO INDUSTRIES, INC.

Employee Owned

5. Route the mat monitor cord from the side of the
Multi-Mount Monitor to the worksurface mat.

NOTE: Use either the included push and clinch
snap or countersunk washer and flat head screw to
secure the cord to the grounded mat.

1.08

6. Connect the power adapter to the power jack
located on the side of the Multi-Mount Monitor.
Route the wire from the supply to the tested AC
outlet, and plug it into the outlet.

Remote Alarm

1. Determine the mounting location of the optional

19653 Remote Alarm. Locate it within reach of the

included remote cable. Its LEDs should be visible to
the operator. Secure the Remote Alarm to a surface
using its mounting tabs and the included pan-head
screws or dual lock fasteners.

2. Connect the Remote Alarm to the Multi-Mount
Monitor using the remote cable.

.188

3.50

2.08

.185

1.38

.79

1.78

Figure 9. Mounting hole locations on the Remote Alarm
(all dimensions are in inches)

10mm Park Snap and 10mm Operator Jack Adapter

The 19652 Multi-Mount Monitor includes an
interchangeable 10mm park snap and 10mm banana
jack adapter for operators who use wrist cords with
10mm terminations. Use the park snaps' knurled rims to
unscrew the 4mm park snap from the monitor and install
the 10mm park snap to the monitor. Plug the 10mm
operator jack adapter into the monitor's operator jack.

.90

3.87

Figure 8. Mounting hole locations on the Multi-Mount
Monitor (all dimensions are in inches)

DESCO WEST - 3651 Walnut Avenue, Chino, CA 91710 • [phone]

DESCO EAST - One Colgate Way, Canton, MA 02021-1407 • [phone] • Website: Desco.com

Figure 10. Changing the park snap on the 19652 Multi­Mount Monitor

TB-3073 Page 5 of 7

© 2017 DESCO INDUSTRIES, INC.

Employee Owned

Operation

1. Fit the wristband snugly onto the wrist.

2. Snap the wrist cord to the wristband.

3. Plug the wrist cord into the operator jack. The green
operator LED will illuminate. This indicates that the
operator is properly grounded.

4. If this does not happen, examine the wrist cord for
continuity or damage and the wristband to ensure
that it fits securely. If you have dry skin, apply an
approved dissipative hand lotion such as Menda

Reztore® ESD Hand Lotion.

5. When leaving the workstation, first touch the
monitor's park snap. The monitor's audible alarm
will disable for approximately 10 seconds. Use this
time to disconnect the wrist cord from the wristband
and attach it to the park snap without sounding a
false alarm.

6. Upon returning to the workstation and disconnecting
the wrist cord from the park snap, the monitor will
provide approximately 10 seconds for the operator
to reconnect the wrist cord to a worn wristband
before sounding the monitor's alarm.

Figure 12. Using the Multi-Mount Monitor at a machine
station

Calibration

Frequency of recalibration should be based on the
critical nature of those ESD sensitive items handled
and the risk of failure for the ESD protective equipment
and materials. In general, Desco recommends that
calibration be performed annually.

Use the Desco 98221 Wave Distortion Monitor
Verification Tester to perform periodic verification (once
every 6-12 months) of the Multi-Mount Monitor. The
verification tester can be used to check the test limits
of the Multi-Mount Monitor without removing it from the
workstation.

Figure 11. Using the Multi-Mount Monitor and Remote
Alarm in a workbench setting

See TB-3074 for more information.

Figure 13. Desco 98221 Wave Distortion Monitor

Verication Tester

DESCO EAST - One Colgate Way, Canton, MA 02021-1407 • [phone] • Website: Desco.com

DESCO WEST - 3651 Walnut Avenue, Chino, CA 91710 • [phone]

TB-3073 Page 6 of 7

© 2017 DESCO INDUSTRIES, INC.

Employee Owned

Specifications

Input Voltage and
Frequency
(External Adapter)

Operating Temperature 50 to 95°F (10 to 35°C)

Environmental
Requirements

Dimensions
(Monitor)

Dimensions
(Remote Alarm)

Weight
(Monitor)

Weight
(Remote Alarm)

Operator Test Range* 500 kilohms to 10 megohms

Worksurface Test
Limit**

Operator Test Voltage 1.2V peak-to-peak @ 1.2µA,

Worksurface Test
Voltage

Alarm Response Time <50 ms

Country of Origin United States of America

AC/DC Power Adapter

Power Input:
100-240VAC, 50/60 Hz

Power Output:
24VDC @ 150mA

Cable Length:
5 ft. (1.5 m)

Indoor use only at altitudes
less than 6500 ft. (2 km)

Maximum relative humidity
of 80% up to 85°F (30°C)
decreasing linearly to 50% @
85°F (30°C)

3.87" L x 2.09" W x .90" H
(98 mm x 53 mm x 23 mm)

1.78" L x 1.08" W x .79" H
(45 mm x 27 mm x 20 mm)

0.14 lbs. (0.06 kg)

0.02 lbs. (0.01 kg)

impedance

10 megohms (±10%)

open circuit

5 to 7.5V, open circuit

Limited Warranty, Warranty Exclusions, Limit
of Liability and RMA Request Instructions

See the Desco Warranty -

http://desco.descoindustries.com/Limited-Warranty.aspx

*This cannot be verified with standard DC test
equipment. The continuous monitor is an impedance
sensing device, and the limits are determined by the
magnitude and angle of the impedance.

**The worksurface mat must have a conductive
layer such as Dual Layer Rubber or Dissipative
3-Layer Vinyl with conductive buried layers. Desco
workstation monitors are not recommended for use with
homogeneous matting.

DESCO WEST - 3651 Walnut Avenue, Chino, CA 91710 • [phone]

DESCO EAST - One Colgate Way, Canton, MA 02021-1407 • [phone] • Website: Desco.com

TB-3073 Page 7 of 7

© 2017 DESCO INDUSTRIES, INC.

Employee Owned