TECHNICAL BULLETIN TB-3034
Combo Tester X3
Installation, Operation and Maintenance
Made in the
United States of America
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 section 6.1.3 Frequency of Functional
Testing. “The wrist strap system should be tested daily to
ensure proper electrical value.”
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.”
“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 S20.20-2007 section 7.3]
The Combo Tester X3 is available in two models:
Item
Stand
Power
Included Adapter
North America
North America
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 act as a
path-to-ground and ensures the presence of a current-limiting
resistor in the grounding devices. 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 factory test ranges are set to:
Wrist Straps:
Footwear:
750 kilohms - 10 megohms
750 kilohms - 35 megohms
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.
19276
No
19277
Yes
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-3034
Page 1 of 6
August 2013
© 2013 DESCO INDUSTRIES, INC.
Employee Owned
Packaging
19276 COMBO TESTER X3
1
1
1
1
1
1
Combo Tester X3
Dual Foot Plate
Power Adapter, 12VDC, N. America
Foot Plate Cord, 6'
Ground Cord
Certificate of Calibration
C. Single-Wire Wrist Strap Jack:
Insert your single-wire
wrist cord here to test your wrist strap.
D. Wrist Strap Status LEDs:
Displays the wrist strap test
results.
E. Dual-Wire Wrist Strap Jack:
Insert your dual-wire wrist
cord here to test your wrist strap.
F. 12VDC Power Jack:
Connect the included power
adapter here to power the Combo Tester X3.
G. Steady-State Test Switch:
Place and hold your finger
here to begin the test.
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. Buzzer Volume Adjustment:
Turn the trimpot clockwise
to increase the buzzer volume and counter-clockwise to
decrease the volume.
E
J. 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.
K. Foot Plate Jack:
Connect one end of the foot plate
cable cord and the other end to the dual foot plate.
19277 COMBO TESTER X3 WITH STAND
1
1
1
1
1
1
2
2
2
4
1
Combo Tester X3
Dual Foot Plate
Power Adapter, 12VDC, N. America
Foot Plate Cord, 6'
Ground Cord
19255
Test Stand
Socket Head Screws, 1/4-20 x 3/4"
Pan Head Screws, 10-32 x 5/8"
Nuts, 10-32
Pan Head Screws, #4 x 3/4"
Certificate of Calibration
Features and Components
A
B
C
D
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
H
I
J
K
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
)
F
123
G
Figure 2. Desco Combo Tester X3 features and
components
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.
DIP switches 3 and 4 control the LOW test limit.
Switch 3 Switch 4 LOW Limit Resistance
ON
OFF
OFF
ON
100 Kilohms (1 x 10
5
)
750 Kilohms (7.5 x 10
5
)
default setting
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-3034
Page 2 of 6
© 2013 DESCO INDUSTRIES, INC.
Employee Owned
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
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.
INSTALLING THE 19277 COMBO TESTER X3 WITH
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.
35 Megohms (3.5 x 10
7
)
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.
INSTALLING THE 19276 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.
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 3. Routing the foot plate cord through the foot
plate’s guide
Figure 5. Routing the ground and foot plate cords
throught the pedestal
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-3034
Page 3 of 6
© 2013 DESCO INDUSTRIES, INC.
Employee Owned
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.
Figure 7. Securing the dual foot plate to the baseplate
8. Power the Combo Tester X3 using the included
power supply.
Operation
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
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 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.
INNER
CONTACT
OUTER
CONTACT
Figure 8. 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 Combot Tester X3. Place on foot on each
foot plate.
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.
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-3034
Page 4 of 6
© 2013 DESCO INDUSTRIES, INC.
Employee Owned
Figure 9. Bridging the test switch’s contacts to initiate
the test
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.
NOTE: Often the initial intermittency will be failure of strain
relief connection to resistor as simulated by ESD S1.1-1998
paragraph 5.7 Bending Life Test.
4.
A “PASS” test result is indicated by illumination of
the green LEDs. A “FAIL LOW” test result is indicated
by illumination of the red LEDs. A “FAIL HIGH” test
result is indicated by illumination of the yellow LEDs.
If your ESD test fails, check your wrist strap and
footwear to ensure that they are functioning properly,
being worn correctly and/or need to be replaced.
NOTE: Failures may be caused by dry skin or minimal sweat
layer. For wrist straps, try using an approved dissipative
hand lotion such as
Menda Reztore™ ESD Hand Lotion
to your wrist prior to use. Footwear test results can be
improved by taking a short walk to build a sweat layer for
better conductivity.
The Combo Tester X3 may also be used to test smocks or
garments that feature a grounding mechanism for operators
using a coil cord connection.
Using the
19276
Combo Tester X3
Using the
19277
Combo Tester X3 with Stand
Calibration
The Combo Tester X3 is calibrated to standards traceable
to NIST. Frequency of recalibratrion 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, we recommend that calibration be
performed annually.
The accuracy of the Combo Tester X3 is specified as:
• ±10% for < 1 Megohm range
• ±10% for 1 Megohm and higher resistance ranges
• ±20% for 1 Gigohm Range
A periodic check (once every 6 to 12 months) using a
precision resistance box should be performed to verify proper
operation.
The EMIT
50424
Limit Comparator is available for the
convenient period testing of the Combo Tester X3.
The Limit Comparator allows the customer to perform NIST
traceable calibration on the Combo Tester X3. The Limit
Comparator can be used on the floor shop within a few
minutes virtually eliminating downtime, verifiying that the
Combo Tester X3 is operating within tolerances.
See
TB-6581
for more information.
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-3034
Page 5 of 6
© 2013 DESCO INDUSTRIES, INC.
Employee Owned
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