TECHNICAL BULLETIN TB-6514
Dual-Wire Dual-Operator Programmable Monitor
Installation, Operation and Maintenance
Packaging
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Made in the
United States of America
Figure 1. EMIT Dual-Wire Dual-Operator Programmable
Monitor
Dual-Wire Dual-Operator Programmable Monitor
Desco
19690
Dual-Wire Elastic Wrist Straps
Power Adapter, 12VDC, N. America (50522 only)
Operator Remotes with Attached Cables
(1 black, 1 white)
Mat Monitor Cords (1 black, 1 white)
Mat Ground Cords (green and yellow)
Monitor Ground Cord (green and yellow)
Universal Snap Kit
Certificate of Calibration
Description
The EMIT Dual-Wire Dual-Operator Programmable
Monitor monitors two operators and two ESD worksurfaces
eliminating the need for periodic testing and record keeping
of wrist straps. The Dual-Wire Dual-Operator Programmable
Monitor uses low-voltage steady state DC continuous-loop
technology to continuously monitor (versus pulsed or
intermittent) dual-wire wrist strap functionality. Independent
audio and visual alarm conditions make it easy to identify
the status of the worksurfaces and operators. Two operator
remotes with 10 foot cables are included for use at adjacent
workstations. Each monitor is calibrated with accepted
procedures and standards traceable to the National Institute
of Standards and Technology (NIST) and includes a NIST
certificate.
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 EMIT Dual-Wire Dual-Operator Programmable Monitor is
available in the following models:
Item
Power Adapter
50515
None
50522
N. America
Features and Components
A
B
C
FRONT VIEW
D
E
F
G
H I J
BACK VIEW
K
L
Figure 2. Dual-Wire Dual-Operator Programmable
Monitor features and components
EMIT
- 3651 Walnut Avenue, Chino, CA 91710 • (909) 664-9980 • Website:
DescoEMIT.com
TB-6514
Page 1 of 4
October 2017
© 2017 DESCO INDUSTRIES, INC.
Employee Owned
A. Operator 1 Status LEDs:
When the green LED is
illuminated, operator 1 is properly grounded. When the LED
is illuminated red or yellow and the alarm sounds, operator 1
is not properly grounded.
B. Worksurface 1 Status LEDs:
When the green LED is
illuminated, worksurface 1 is properly grounded. When the
red LED is illuminated and the alarm sounds, worksurface 1
is not properly grounded.
C. Operator 2 Status LEDs:
When the green LED is
illuminated, operator 2 is properly grounded. When the LED
is illuminated red or yellow and the alarm sounds, operator 2
is not properly grounded.
D. Worksurface 2 Status LEDs:
When the green LED is
illuminated, worksurface 2 is properly grounded. When the
LED is illuminated red and the alarm sounds, worksurface 2
is not properly grounded.
E. Power Jack:
Connect to the included 12VDC power
adapter.
F. Operator 2 Remote Jack:
Connect to the black operator
remote cable.
G. Operator 1 Remote Jack:
Connect to the white operator
remote cable.
H. Monitored Mat 1 Terminal:
Monitors a worksurface mat
for proper dissipative resistance and static charges. Connect
the white mat monitor cord here.
I. Ground Terminal:
Common ground point for the monitor.
Connect to the green and yellow monitor ground cord.
J. Monitored Mat 2 Terminal:
Monitors a worksurface mat
for proper dissipative resistance and static charges. Connect
the black monitor cord here.
K. Data Output:
For manufacturer use.
L. Alarm Audible Adjustment:
Turn the trimpot
counter-clockwise to increase the audible alarm volume and
clockwise to decrease it.
4. Attach the worksurface mats to ground using the green
mat ground cords. Install the ring terminal end of the
cord to an appropriate ground point. Attach the snaps
terminals to the snaps on the worksurface mat.
5. Install the tinned wire end of the green and yellow
monitor ground cord to the ground terminal located at the
back of the monitor. Install its ring terminal to an
appropriate ground point. Be sure to use a different
ground point than the one used for the mats. The face
plate screw of a grounded AC wall outlet may provide a
convenient connection point.
6. Route the mat cords from the back of the monitor to
the snaps on worksurface mats. The white cord is for
worksurface mat #1. The black cord is for worksurface
mat #2.
7. Insert the operator remote cables into their appropriate
jacks located at the back of the monitor. The white cable
is for operator #1. The black cable is for operator #2.
8. Connect the power adapter to the power jack located
at the back of the monitor. Plug the power adapter into
a proper AC power outlet. The monitor is now powered.
NOTE:
Worksurface must have a conductive layer such as
Dual Layer Rubber or Dissipative 3-Layer Vinyl or Micastat
®
Dissipative Laminate with conductive buried layers. EMIT
Continuous Monitors are not recommended for use with
homogeneous matting.
OPERATOR 2
REMOTE JACK
WHITE CABLE
WRIST
STRAP
MONITOR
OPERATOR 2
REMOTE JACK
BLACK CABLE
WRIST
STRAP
MONITOR
Installation
1. Determine the mounting location of the Dual-Wire
Dual-Operator Monitor. The front panel should be visible
to both operators.
2. Determine the mounting locations of the operator
remotes. Be sure to install the remotes at a distance
that enables the 10 foot leads to reach the back of the
monitor.
3. Install tinned wire ends of the mat cords to their
appropriate screw terminal block located at the back of
the monitor.
MAT 1 WIRING
WHITE CABLE
ELECTRIC
GROUND
MAT 2 WIRING
BLACK CABLE
Screw allows ground cord to
be bolted to mat; keeps cord
from disconnecting.
or
10mm PUSH &
CLINCH SNAP
10mm PUSH &
CLINCH SNAP
or
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
WORKSURFACE
OPERATOR 2
WORKSURFACE
BENCH
GROUND
Figure 3. Installing the Dual-Wire Dual-Operator
Programmable Monitor
EMIT
- 3651 Walnut Avenue, Chino, CA 91710 • (909) 664-9980 • Website:
DescoEMIT.com
TB-6514
Page 2 of 4
© 2017 DESCO INDUSTRIES, INC.
Employee Owned
Operation
1. Monitoring of the operators will remain in the STANDBY
condition until a wrist cord is plugged into the operator
remote. STANDBY mode is indicated by a blinking
yellow operator LED.
2. Plug a wrist strap cord, not attached to the wristband,
into the monitored jack labeled WRIST STRAP
MONITOR located on the remote. This automatically
activates the selected operator channel. The
corresponding operator LED should illuminate red and
the alarm should sound on the monitor.
3. Remove the charges from your body by making contact
with a properly grounded ESD worksurface.
4. Snap the cord to the wristband, and fit it snugly onto
your wrist. This should silence the audible alarm and
cause the corresponding operator LED to switch from
red to green. If this does not happen, examine the wrist
cord for continuity or damage and your wrist band to
ensure that it is securely fit. If you have dry skin,
apply an approved dissipative hand lotion such as
Menda Reztore™ ESD Hand Lotion.
5. The AUX GND jack located on the operator remote
is a grounded and unmonitored connection for guests. It
must be used with a banana plug wrist cord and
single-wire wristband.
To gain access to these switches, remove the monitor’s
cover and position the monitor so the PCB matches the
orientation shown in Figure 5. Switches SW1 and SW2
control the operator test voltage. Switch SW3 controls the
operator high test limit.
Figure 5. Switches SW1, SW2 and SW3 inside the
monitor’s enclosure
Operator Test Voltage
+5V
SW1 Position: RIGHT
SW2 Position: LEFT
+8V
SW1 Position: LEFT
SW2 Position: RIGHT
Operator High Test Limit
10 megohms
SW3 Position: RIGHT
35 megohms
SW3 Position: LEFT
Figure 4. Connecting a dual-wire wrist strap to the
operator remote
SETTING THE OPERATOR TEST VOLTAGE AND TEST
LIMIT
The Dual-Wire Dual-Operator Monitor’s operator test voltage
and high test limit can be set to different values. The
operator test voltage can be set to either +5V or +8V, and
the operator high test limit can be set to either 10 megohms
or 35 megohms. The default voltage is +8V, and the default
operator high test limit is 35 megohms. These settings are
controlled by a set of 3 switches located inside the monitor’s
enclosure.
NOTE: EMIT recommends re-calibration of the monitor
should either setting be changed. See the “Calibration”
section for more information.
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, EMIT recommends that calibration be performed
annually.
Use the EMIT 50524 Limit Comparator for Dual-Wire
Monitors to perform periodic testing (once every 6-12
months) of the Dual-Wire Dual-Operator Programmable
Monitor. The Limit Comparator can be used on the shop
floor within a few minutes virtually eliminating downtime,
verifying that the monitor is operating within tolerances.
See
TB-6542
for more information.
EMIT
- 3651 Walnut Avenue, Chino, CA 91710 • (909) 664-9980 • Website:
DescoEMIT.com
TB-6514
Page 3 of 4
© 2017 DESCO INDUSTRIES, INC.
Employee Owned
Figure 6. EMIT 50524 Limit Comparator for Dual-Wire
Monitors
NIST Calibration
EMIT provides a basic, National Institute of Standards
and Technology (NIST) traceable calibration for the
products that we manufacture. This is sometimes
referred to as a Level 1 calibration.
For more on National Institute of Standards and
Technology see:
http://www.nist.gov/index.html
For more information on the calibration that EMIT’s
provides for products that we manufacture see:
http://emit.descoindustries.com/Calibration.aspx
Specifications
Operating Voltage
Operating Temperature
Monitor Dimensions
Monitor Weight
TEST VOLTAGES
Operator
Worksurface
TEST LIMITS
Operator
12 VDC
32°F - 104°F (0 - 40°C)
4.4" x 4.7" x 2.1"
(11.2cm x 11.9cm x 5.3cm)
1.1 lbs (0.5 kg)
+8 V** or +5 V
200 mV
Low Fail: < 1.72 megohms
Pass: 2 - 9 megohms
High Fail: > 11.5 megohms
or
Pass: 2 - 30 megohms**
High Fail: > 40 megohms**
Pass: < 3.5 megohms
Fail: > 3.8 megohms
Figure 7. Operator Remote dimensions
Replacement remotes are available as EMIT item
numbers 50525 and 50526.
Worksurface
**Default
Limited Warranty, Warranty Exclusions, Limit of
Liability and RMA Request Instructions
See the EMIT Warranty -
http://EMIT.descoindustries.com/Warranty.aspx
EMIT
- 3651 Walnut Avenue, Chino, CA 91710 • (909) 664-9980 • Website:
DescoEMIT.com
TB-6514
Page 4 of 4
© 2017 DESCO INDUSTRIES, INC.
Employee Owned
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