TECHNICAL BULLETIN TB-3073
Combo Tester X3
Installation, Operation and Maintenance
Item
Description
Made in the
United States of America
The Combo Tester X3 and its accessories are available
as the following item numbers:
19278
Combo Tester X3
19279
Combo Tester X3 with Stand
19255
Stand, for Combo Tester X3
50755
ESD Glove Test Fixture
50424
Limit Comparator
19262
Power Adapter, 100-240VAC Input, 12VDC
0.5A Output, All Plugs
50406
Replacement Dual Foot Plate
62103
Replacement Foot Plate Cord
19274
Replacement Ground Cord
Per ANSI/ESD S20.20 section 7.3 “A Compliance
Verification Plan shall be established to ensure the
Organization’s fulfillment of the technical requirements
of the ESD Control Program Plan. Process monitoring
(measurements) shall be conducted in accordance
with a Compliance Verification Plan that identifies the
technical requirements to be verified, the measurement
limits and the frequency at which those verifications
shall occur. The Compliance Verification Plan shall
document the test methods and equipment used for
process monitoring and measurements. … The test
equipment selected shall be capable of making the
measurements defined in the Compliance Verification
Plan.”
Per ANSI/ESD S1.1 Annex A.3 Frequency of System
Testing “The wrist strap system should be tested daily to
ensure proper electrical resistance.”
Per ESD Handbook ESD TR20.20 section 5.3.2.4.2
Additional User Wrist Strap Testing “Proper testing of
the wrist strap includes the resistance of the groundable
point on the end of the cord, the cord itself, the resistor,
the cord-to-cuff snap connector, the resistance of the
interface of the cuff, the cuff/wrist interface, and the
resistance of the person between the wrist and the hand
that contacts the test electrode.”
Per ESD Handbook ESD TR20.20 section 5.3.2.2.2
Wrist Strap Ground Cord “At first glance, the ground
cord appears to be a relatively simple assembly.
However, the design requirements are considerable,
given the wide range of user applications and the
durability requirements of constant tugging, flexing,
and dragging over the edge of workstation tops and
equipment chassis.”
Figure 1. Desco Combo Tester X3 and Dual Foot Plate
Description
The Desco Combo Tester X3 verifies the functionality
of an operator’s wrist strap and footwear. It determines
if an operator’s wrist strap and footwear will function
correctly. The operator’s wrist strap and footwear will
test simultaneously with no need for separate tests.
Green lights indicate that the wrist strap and footwear
are passing. Red lights and an audible alarm indicate
when the wrist strap and/or footwear (left or right) are
failing. If failure occurs, the tester will also display if the
grounding device’s resistance is too low or too high.
The Combo Tester X3 features a reliable and durable
solid-state switch which replaces the traditional
mechanical test switch with a spring and moving parts.
The outer and inner portions of the solid-state switch are
designed to be bridged by a person’s skin. The Combo
Tester X3 is compatible with both single-wire and
dual-wire wrist straps.
The factory test limits are set to:
Wrist Straps:
Footwear:
750 kilohms and 10 megohms
750 kilohms and 35 megohms
(See page 3 for alternate test limit settings)
Each Combo Tester X3 is calibrated with accepted
procedures and standards traceable to the National
Institute of Standards and Technology (NIST) and
includes a NIST certificate.
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-3066
Page 1 of 8
May 2018
© 2018 DESCO INDUSTRIES, INC.
Employee Owned
“Compliance verification should be performed prior to
each use (daily, shift change, etc.). The accumulation
of insulative materials may increase the foot grounder
system resistance. If foot grounders are worn outside
the ESD protected area testing for functionality
before reentry to the ESD protected area should be
considered.” (ESD SP9.2 APPENDIX B - Foot Grounder
Usage Guidance)
“Compliance verification records shall be established
and maintained to provide evidence of conformity to the
technical requirements.” (ANSI/ESD S20.20 section 7.3)
A. Test Limit DIP Switch:
Use this DIP switch to
configure the resistance limits of the tester. See the
section titled “Tester Configuration” for more information.
B. Footwear Status LEDs:
Displays the footwear test
results.
C. 12VDC Power Jack:
Connect the included power
adapter here to power the Combo Tester X3.
D. Steady-State Test Switch:
Place and hold your
finger here to begin the test.
E. Single-Wire Wrist Strap Jack:
Insert your
single-wire wrist cord here to test your wrist strap.
F. Dual-Wire Wrist Strap Jack:
Insert your dual-wire
wrist cord here to test your wrist strap.
G. Wrist Strap Status LEDs:
Displays the wrist strap
test results.
H. Relay Terminal:
Can be integrated with electronic
door locks, lights, buzzers, etc. It is capable of switching
up to 1A @ 30VDC or .5A @ 125VAC.
Terminals 1 & 2 = Normally Closed
Terminals 2 & 3 = Normally Open
NOTE: All tests must pass in order for the relay to
activate.
I. Ground Jack:
Insert the banana plug end of the
included ground cord to this jack. Connect the ring
terminal end of the cord to equipment ground. This
connection will remove any static charge from the user
before the test.
NOTE: Failure to correctly ground the
Combo Tester X3 may result in damage not covered
under warranty.
J. Foot Plate Jack:
Connect one end of the foot plate
cable cord and the other end to the dual foot plate.
K. Buzzer Volume Adjustment:
Turn the trimpot
clockwise to increase the buzzer volume and
counter-clockwise to decrease the volume.
19278 COMBO TESTER X3
1 Combo Tester X3
1 Dual Foot Plate
1 Power Adapter, 12VDC, with interchangeable plugs
(North America, UK/Asia, Europe)
1 Foot Plate Cord, 6'
1 Ground Cord
1 Certificate of Calibration
19255 STAND, FOR COMBO TESTER X3
1 Pedestal
1 Baseplate
2 Socket Head Screws, 1/4-20 x 3/4"
2 Pan Head Screws, 10-32 x 5/8"
2 Nuts, 10-32
4 Pan Head Screws, #4 x 3/4"
Packaging
Features and Components
A
B
C
123
D
E
F G
H
I J K
Figure 2. Dual Combination Tester features and
components
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-3066
Page 2 of 8
© 2018 DESCO INDUSTRIES, INC.
Employee Owned
Installation
TESTER CONFIGURATION
The resistance limits for footwear and wrist strap tests
are controlled by the DIP switches located on the left
side of the Combo Tester X3. Use the following tables
for the DIP switch settings and their corresponding test
values.
Footwear Resistance
DIP switches 1 and 2 control the HIGH test limit.
Switch 1 Switch 2 HIGH Limit Resistance
ON
OFF
ON
OFF
ON
OFF
OFF
ON
10 Megohms (1 x 10
7
)
35 Megohms (3.5 x 10
7
)
100 Megohms (1 x 10
8
)
1 Gigohm (1 x 10
9
)
INSTALLING THE COMBO TESTER X3
1. Mount the tester at the desired location using the
four mounting holes located in the corners of the
yellow mounting plate.
2. Set the Dual Foot Plate below the tester.
3. Insert one end of the foot plate cord into the stereo
jack located at the bottom of the tester. Insert the
opposite end of the cord into the stereo jack located
at the back of the foot plate.
4. Use the guide located on the bottom of the foot
plate to route the cord out of the side. This will
prevent the foot plate cord from being accidentally
tripped and unplugged.
DIP switches 3 and 4 control the LOW test limit.
Switch 3 Switch 4 LOW Limit Resistance
OFF
ON
OFF
OFF
OFF
ON
footwear test disabled
100 Kilohms (1 x 10
5
)
750 Kilohms (7.5 x 10
5
)
Bottom Side
default setting
NOTE: At 1 Gigohm high limit resistance, a dirty foot
plate could result in a false pass. Be sure to keep the
foot plate clean particularly when using this setting. This
setting is not suitable for relative humidity greater than
50%.
Wrist Strap Resistance
DIP switches 5 and 6 control the HIGH test limit.
Switch 5 Switch 6 HIGH Limit Resistance
OFF
ON
ON
OFF
ON
OFF
wrist strap test disabled
10 Megohms (1 x 10
7
)
35 Megohms (3.5 x 10
7
)
Figure 3. Routing the foot plate cord through the foot
plate’s guide
5. Insert the ground cord’s banana plug into the
ground jack located at the bottom of the tester.
Connect ground cord’s ring terminal to equipment
ground. This connection will remove any static
charge from the user before the test.
NOTE: Failure
to correctly ground the Combo Tester X3 may result
in damage not covered under warranty.
6. Power the Combo Tester X3 using the included
power supply.
default setting
DIP switch 5 must be ON (default setting) for the wrist
strap test to be active. The wrist strap test will be
disabled if DIP switch 5 is set to OFF.
The LOW limit for the wrist strap test is set to 750
kilohms and cannot be modified by the user.
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-3066
Page 3 of 8
© 2018 DESCO INDUSTRIES, INC.
Employee Owned
INSTALLING THE COMBO TESTER X3 AND STAND
1. Insert the pedestal to the baseplate with the
mounting bracket sloping toward the operator. Be
sure to align the screw holes located at the base of
the pedestal.
2. Use the two 1/4-20 socket cap screws to secure the
pedestal to the baseplate.
Figure 4. Securing the pedestal to the baseplate using
the 2 socket cap screws
3. Route the ground and foot plate cords through the
pedestal. Feed the cords from the bottom and have
them exit through the top.
Figure 6. Securing the Combo Tester X3 to the pedestal
5. Insert one end of the foot plate cord into the foot
plate jack located at the bottom of the tester.
Connect the other end of the foot plate cord into the
jack located on the dual foot plate.
6. Insert the ground cord’s banana plug into the
ground jack located at the bottom of the tester.
Connect ground cord’s ring terminal to equipment
ground. This connection will remove any static
charge from the user before the test.
NOTE: Failure
to correctly ground the Combo Tester X3 may result
in damage not covered under warranty.
7. Fit the dual foot plate into a position so that it is
flush with the front and top of the baseplate. Secure
the dual foot plate to the baseplate using the four
included #4 pan head screws.
Figure 5. Routing the ground and foot plate cords
through the pedestal
4. Align the backplate’s two holes located above and
below the tester to the two holes on the pedestal’s
mounting bracket. Secure the backplate using the
two included 10-32 pan head screws and nuts.
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-3066
Page 4 of 8
© 2018 DESCO INDUSTRIES, INC.
Employee Owned
*NOTE: The Access Control System must have a time
delay feature in order to achieve the configuration
described above. Set the Access Control System’s
relay to remain active for a few seconds when a valid
proximity badge is accepted. The relay will need to
remain active long enough for an operator to perform a
test on the Combo Tester X3. The access control device
will only unlock when it receives an active signal from
both the Access Control System and Combo Tester X3.
Operation
Figure 7. Securing the dual foot plate to the baseplate
8. Power the Combo Tester X3 using the included
power supply.
WIRING THE COMBO TESTER X3 TO AN ACCESS
CONTROL SYSTEM
The Combo Tester X3 may be connected to an Access
Control System to grant access when both a valid
proximity badge is read and PASS test results are
achieved at the tester. Figure 8 shows an example
when using a turnstile.
DATA
LINES
1. A circling light around the test switch indicates when
the Combo Tester X3 is on standby and ready to
perform a test.
STANDBY
LED
OUTER
CONTACT
Access Control System*
DATA
INPUT
NORMALLY
OPEN RELAY
Proximity
Reader
INNER
CONTACT
Figure 9. Steady-State Test Switch features and
components
2. While wearing a wrist strap and/or ESD footwear,
plug the wrist cord into its corresponding jack
located on the face of the Combo Tester X3. Place
one foot on each foot plate.
ACC
INPUT
Combo
Tester X3
(normally open relay
contacts shown above)
3. To begin the test, use your finger to bridge the test
switch’s inner and outer contacts. The blue standby
LED will become solid to indicate that the test has
been initiated. Hold your finger down until the test
results are displayed.
If your finger is removed too early, the tester’s LEDs
will blink three times to indicate that the test was not
completed. DO NOT touch any other metal while
performing your test as this will affect your results.
Turnstile
Figure 8. Wiring the Combo Tester X3 to an Access
Control System
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-3066
Page 5 of 8
© 2018 DESCO INDUSTRIES, INC.
Employee Owned
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