Desco 19665 Installation and operating instructions

Packaging
1 Dual Wire - Dual Operator Programmable Monitor
2 Operator Remotes
2 Operator Remote Cables (1 Black, 1 White)
1 Power Adapter
2 Mat Monitor Cables (1 Black, 1 White)
2 6' Mat Ground Cords with Additional Ring Terminals (Green
and Yellow)
1 10' Monitor Ground Cord (Green and Yellow)
Installation
A. Determine the mounting location of the monitor. The front
panel should be visible to a supervisor.
B. Determine the mounting location of the operator remotes.
The white remote is for operator #1 and the black remote is
for operator #2. Make sure that each remote is located so
that the remote leads reach the monitor but are convenient
for the operator.
C. Attach the operator remotes to the bench or other surface
using the provided screws. (See Figure 7).
D. Attach the tinned wire ends of the mat wires to the
appropriate screw terminal connection on the rear of the
unit. (See Figure 2). The white wire is for operator #1 and
the black wire is for operator #2.
E. If not already done, attach the work surface to workstation
common point ground using the pictured ground wires. For
mats, attach the grounding point snaps at the ends of the
ground monitor cords to the grounding point snaps on the
work surface. These ground monitor cords are used for
sensing whether or not the unit is properly grounded. Refer
to figure 3 for snap-plate fitting diagram and for laminates or
ther hard surfaces with a buried conductive layer.
F. Attach the tinned wire end of the black ground-reference
wire to the center position of the screw terminal block on
the rear of the unit. Attach the ring terminal end to an
alternate ground point. It is important that this ground wire is
attached to a separate ground point other than the work
surface ground cords from the previous step to ensure
proper independent monitoring. The faceplate screw of a
grounded AC wall outlet may provide a convenient
connection point.
TB-3019 August 2010 Page 1 of 4
Dual-Wire Workstation Continuous Monitor
Installation, Operation, and Maintenance
Figure 1. Desco 19665 Dual Wire - Dual Operator
Programmable Monitor
Description
Continuous monitors pay for themselves, by improving quality,
productivity, and eliminating daily wrist strap testing and test
result logging. Per ESD-S1.1 paragraph 6.1.3 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.”
Per ESD Handbook TR20.20 paragraph 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 Desco Dual Wire - Dual Operator Programmable Monitor
can maintain two work surfaces and two operators at ground
potential to virtually eliminate the risk of ESD damage. The
highly visible LED display and audible alarm makes it easy to
monitor the status of the work surfaces and operators. The
Dual-Wire Dual-Operator Programmable Monitor uses Desco’s
patented* dual resistive loop technology. No other method is as
direct and reliable. Both work surfaces, and individual operator
resistance limits, can be programmed and re-configured
as required. If the ground potential of either work surface
or operator is lost the, monitor immediately alarms (both
audible and visual). The monitor is unaffected by capacitance
variations associated with personnel and environmental
conditions.
The Dual Wire - Dual Operator Programmable Monitor
features:
• Monitoringoftwooperatorsindependently.
• Monitoringoftwogroundconnections(worksurfaces)
independently.
• Fullyindependentalarmingconditions:audibleandvisual.
• IndependentLEDstatuslightsforeachoperatorandeach
ground connection (work surface.)
• Twoindependentoperatorwriststrapgroundpointremotes
with 10’ cables.
NOTE: Use dual-wire wrist straps with this monitor.
Made in America
*U.S. Patents 6,052,053 and 6,205,408
© 2010 DESCO INDUSTRIES INC.
Employee Owned
DESCO WEST-3651WalnutAvenue,Chino,CA91710•(909)627-8178•Fax(909)627-7449
DESCO EAST-OneColgateWay,Canton,MA02021-1407•(781)821-8370•Fax(781)575-0172•WebSite:Desco.com
Figure 2. Dual Wire - Dual Operator Programmable Monitor
rear view
TECHNICAL BULLETIN TB-3019
TERMINAL
SCREWS (DO NOT
OVER TIGHTEN)
POWER CONNECTION
12VDC CENTER POSITIVE
PLUG IN OPERATOR 1 CABLE HERE
(WHITE CABLE)
PLUG IN OPERATOR 2 CABLE HERE
(BLACK CABLE)
VOLUME ADJUSTMENT
(COUNTER CLOCKWISE
TO INCREASE VOLUME
DATA PORT RJ45
CONNECT TO BLACK 10mm CORD TO
10mm SNAP ON WORK SURFACE 1
CONNECT TO EARTH GROUND
CONNECT TO WHITE 10mm CORD TO
10mm SNAP ON WORK SURFACE 1

G. Route the work surface monitor wires from the back of the
monitor unit, to the snaps/bolts attached to the grounded
surfaces. Attach the white ground wire to the operator #1
work surface and the black ground wire to the operator #2
work surface.
H. Route the operator remote wires to the monitoring unit and
insert the modular plugs into the appropriate jacks on the
rear of the unit. (See Figure 2)
Mat Grounding
It is recommended to connect the mat wire (10mm snap) from
the monitor and the mat ground wire (10mm snap) to two
separate points on the bench mat as shown in Figure 4.
Operation
Wrist Strap Connections
Once all the connections described above have been made
and the unit has been powered up, the unit is ready for
operation. Install operator wrist straps and ground wires. Dual
snaps on the operator ground wires attach to the wristband
snaps and the mono plug on the other end inserts into the
operator remote as illustrated in Figure 5. The operator’s
monitoring is in “STANDBY” mode until the operator’s ground
wire is plugged into the remote jack for that station.
TB-3019 Page 2 of 4 © 2010 DESCO INDUSTRIES INC.
Employee Owned
DESCO WEST-3651WalnutAvenue,Chino,CA91710•(909)627-8178•Fax(909)627-7449
DESCO EAST-OneColgateWay,Canton,MA02021-1407•(781)821-8370•Fax(781)575-0172•WebSite:Desco.com
Figure 3. Installing the Dual Wire - Dual Operator
Programmable Monitor
I. Plug the DC power supply plug into the power jack in the
rear of the unit. Route the wire from the supply to a nearby
AC outlet and plug the power adapter into the outlet. Make
sure the voltage and frequency match those listed on the
AC adapter. The monitor should now be powered.
Figure 5. Connecting wrist straps to the operator remote
NOTE: The operator remote has two jacks. One is a 3.5 mm
mono jack for use with a dual wire wrist strap. A dual wire
wrist strap plugged into this jack will be monitored. The other
jack is a grounded banana jack for use with carts, equipment,
or other grounding applications. This grounded point is not
monitored.
Status Indicators
The audible alarm for Operator 1 and Ground 1 is continuous.
The audible alarm for Operator 2 and Ground 2 is a repetitive
beep.Ifafaultconditionexistsforbothoperatorsand/orboth
grounds, the alarm will sound continuously. The alarm volume
may be adjusted with the potentiometer on the rear of the unit
(see Figure 2).
Figure 6. LED features and components
10mm snap needs to pierce
and clinch bottom side of
mat. Snap needs to be at
least12"apartor72"max.
10mm snap needs to pierce
and clinch bottom side of
mat. Snap needs to be at
least12"apartor72"max.
OPERATOR 1
WORK -SURFACE
OPERATOR 2
WORK -SURFACE
10mm PUSH &
CLINCH SNAP
10mm PUSH &
CLINCH SNAP
BENCH
GROUND
MAT 1 WIRING
-WHITE CABLE MAT 2 WIRING
-BLACK CABLE
WRIST
STRAP
MONITOR
WRIST
STRAP
MONITOR
ELECTRIC
GROUND
OPERATOR 2
REMOTE JACK
-BLACK CABLE
OPERATOR 2
REMOTE JACK
-WHITE CABLE
Yellow LED blinking indicates stand-by mode, no operator connected.
Yellow LED non- blinking indicates resistance lower than 1.9Meg Ohms
between operator and monitored ground
Green LED indicates good wrist cord and operator
resistance between 1.9 Meg Ohms and 10 Meg Ohms
to monitored ground.
Green LED indicates good work surface
resistance to hard ground connection.
Red LED indicates resistance higher than 10 Meg Ohms
between operator and monitored ground followed by a
continuous alarm for OPERATOR 1 and a repetitive alarm
for OPERATOR 2.
Red LED indicates resistance is higher than
3.5 Meg Ohms from ground through work
surface or open connection to ground.
GROUND 1 will continuously alarm and
GROUND 2 will repetitvely alarm.
Figure 4. Grounding the work surface mats
Screw allows ground cord to
be bolted to mat; keeps cord
from disconnecting.
or
19665
Ground Ref. Wire
GREY MAT WIRE BLACK MAT WIRE
MAT #1 MAT #2
Mat ground cord
or

The monitor provides status indicators for the following
conditions:
•Standby - The operator is not plugged into the remote. This
condition is indicated by a flashing yellow LED in the operator
section of the display.
•Operator Fail High - The operator’s series resistance is
greater than the upper resistance limit. This condition is
indicated by the red LED in the Operator section of the display
along with an audible alarm
•Operator Fail Low - The operator’s series resistance is less
than 1.9Meg Ohm. This condition is indicated by the solid
yellow LED in the Operator section of the display.
•Operator Pass - The operator’s series resistance is within
the range of 1.9Meg Ohm to the upper resistance limit. This
condition is indicated by the green LED in the Operator section
of the display.
•Ground Fail High - The resistance from the mat connection
to ground is greater than 3.5Meg Ohm. This condition is
indicated by the red LED in the Ground section of the display
as well as an audible alarm.
•Ground Pass - The resistance from the mat connection to
ground is less than 3.5Meg Ohm. This condition is indicated
by the green LED in the Ground section of the display.
The resistance values quoted above are the Factory Defaults.
These numbers will vary depending on the configuration.
Changing the Test Voltage
The monitor can be set for a test voltage of either +5V or +8V.
Reducing the test voltage will result in a lower finger-tip voltage
on the operator. To change the test voltage you must set two
switches inside the unit.
The unit is set at the factory at 8 volts. NOTE: If the unit
changed to a different voltage, it must be recalibrated.
Remove the four case screws and open the monitor’s case.
BE SURE TO OBSERVE ESD PRECAUTIONS, AS THERE
ARE ESD SENSITIVE DEVICES INSIDE THE CASE. Refer to
Figure 7 for setting the test voltage to +5V and +8V.
Periodic Preventive Maintenance Verification
The EMIT 50524 Dual-Wire Monitor Limit Comparator may be
used to check the test ranges of the Dual Wire - Dual Operator
Monitor. See EMIT TB-6542 for instructions.
TB-3019 Page 3 of 4 © 2010 DESCO INDUSTRIES INC.
Employee Owned
DESCO WEST-3651WalnutAvenue,Chino,CA91710•(909)627-8178•Fax(909)627-7449
DESCO EAST-OneColgateWay,Canton,MA02021-1407•(781)821-8370•Fax(781)575-0172•WebSite:Desco.com
Environmental Conditions
• Suitableforindooruseonlyataltitudesnotexceeding6500
ft. (2 km)
• Maximumrelativehumidityof80%upto88°F(31°C)
decreasinglinearlyto50%@104°F(40°C)
• Pollutiondegree2perIEC644
• Temperaturerangeof41°F(5°C)to104°F(40°C)
Dip Switches
Function Down Up
Switch 1 Input Voltage 8v 5v
Switch 2 5v 8v
Switch 3 Wrist Strap 35m 10m
High limit
Specifications
• Twouserselectableresistancelevelsof10Megohmsor35
Meg ohms.
• Twouserselectabletestvoltagesettingsof+5Vor+8V.
• SCCNcompatibledataoutput.
• StainlessSteelhousing.
• Size:4.3"Wx4.4"Dx1.8"H
• Plug-inpowersupply:110VAC/60Hzinput,12VDC/500mA
output. 2.5mm connector - center positive. Any alternate
transformermustcomplywiththeSafetyExtraLowVoltage
(SELV) insulation requirements.
• Important:Thisappliancehasametalcasingbuttheearth
connection is only used for operational purposes. It is
considered to be class I and tested as class II. The power
supply connection plug is accessible to the user and there
is no safety insulation inside the monitor. Therefore, the
insulation of the power supply is critical.
• RatedPowerconsumption:3.6VA.

DESCO761PENARTHAVE.,WALNUT,CA91789-3074•(909)598-2753•FAX(909)595-7028•FAXREQUEST(909)598-0864
TB-3019 Page 4 of 4 © 2010 DESCO INDUSTRIES INC.
Employee Owned
DESCO WEST-3651WalnutAvenue,Chino,CA91710•(909)627-8178•Fax(909)627-7449
DESCO EAST-OneColgateWay,Canton,MA02021-1407•(781)821-8370•Fax(781)575-0172•WebSite:Desco.com
Limited Warranty
Descoexpresslywarrantsthatforaperiodofone(1)yearfromthe
date of purchase, Desco Monitors will be free of defects in material
(parts) and workmanship (labor). Within the warranty period, a unit
will be tested, repaired, or replaced at our option, free of charge.
Call our Customer Service Department at 909-627-8178 for a Return
MaterialAuthorization(RMA)andpropershippinginstructionsand
address. Include a copy of your original packing slip, invoice, or
other proof of purchase date. Any unit under warranty should be
shipped prepaid to the Desco factory. Warranty repairs will take
approximatelytwoweeks.
If your unit is out of warranty, call our Customer Service Department
at 909-627-8178foraReturnMaterialAuthorization(RMA)and
proper shipping instructions and address. Desco will quote repair
charges necessary to bring your unit up to factory standards.
Warranty Exclusions
THEFOREGOINGEXPRESSWARRANTYISMADEINLIEU
OFALLOTHERPRODUCTWARRANTIES,EXPRESSEDAND
IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE WHICH ARE SPECIFICALLY
DISCLAIMED.Theexpresswarrantywillnotapplytodefectsor
damage due to accidents, neglect, misuse, alterations, operator
error, or failure to properly maintain, clean or repair products.
Limit of Liability
In no event will Desco or any seller be responsible or liable for
any injury, loss or damage, direct or consequential, arising out of
the use of or the inability to use the product. Before using, users
shall determine the suitability of the product for their intended use,
and users assume all risk and liability whatsoever in connection
therewith.
Figure 7. Operator Remote Dimensions
Replacement remote jacks (items 50526 and 50525) are
available through EMIT.