SCS TB-9069 Advance Installation, Operation And Maintenance

USER GUIDE TB-9069
Dual Combination Tester
Installation, Operation and Maintenance
Figure 1. SCS 770750 Dual Combination Tester and
Dual Foot Plate
Description
The SCS 770750 Dual Combination Tester 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 Dual Combination Tester 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 Dual
Combination Tester is compatible with both single-wire
and dual-wire wrist straps.
The factory test limits are set to:
Wrist Straps: 750 kilohms and 10 megohms
Footwear: 750 kilohms and 35 megohms
(See page 3 for alternate test limit settings)
Each Dual Combination Tester is calibrated with
accepted procedures and standards traceable to the
National Institute of Standards and Technology (NIST)
and includes a NIST certificate.
TB-9069 Page 1 of 8 December 2017
SCS - 926 JR Industrial Drive, Sanford, NC 27332
East: (919) 718-0000 | West: (909) 627-9634 • Website:
The Dual Combination Tester and its accessories are
available as the following item numbers:
Item Description
770750 Dual Combination Tester
770751 Limit Comparator
770752 Power Adapter, 100-240VAC Input,
12VDC 0.5A Output, All Plugs
770755 Stand, for Dual Combination Tester
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."
"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)
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