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-3069
Page 1 of 7
© 2016 DESCO INDUSTRIES, INC.
Employee Owned
Combo Tester
Installation, Operation and Maintenance
Description
The Desco Combo Tester verifies the functionality of
an operator’s wrist strap and footwear (footwear test
requires foot plate). It determines if an operator’s wrist
strap and footwear will function correctly. A rocker
switch allows the operator to select a wrist strap or
footwear test. A green light indicates that the wrist strap
or footwear is passing. Red and yellow lights plus an
audible alarm indicate when the wrist strap or footwear is
failing. If failure occurs, the tester will also display if the
grounding device’s resistance is too low or too high.
The Combo Tester may also be used to test smocks
or garments that feature a grounding mechanism for
operators using a coiled cord connection.
The factory test limits are set to:
Wrist Straps: 750 kilohms and 10 megohms
Footwear:
750 kilohms and 100 megohms
Limits meet the required limits for Compliance
Verification of ANSI/ESD S20.20 (Wrist Strap System
< 3.5 x 10
7
ohms and Footwear < 1 x 10
9
ohms tested
per ESD TR53).
Contact
Desco Customer Service
if custom test limits
are required.
The Combo Tester can be powered by a 9 volt battery or
the Desco
98256
(120VAC) and
98257
(220VAC) power
adapters (sold separately). A warning light on the tester
indicates when the battery power is too low and affecting
the test results.
Each Combo Tester is calibrated with accepted
procedures and standards traceable to the National
Institute of Standards and Technology (NIST) and
includes a NIST certificate.
September 2016
Per ANSI/ESD S20.20 section 7.4 “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.”
Item
Description
19280
Combo Tester
19282
Combo Tester with Stand and Foot Plate
19283
Combo Tester with Stainless Steel Foot Plate
19261
Combo Tester Mounting Plate
98254
Stand and Foot Plate
98273
Stainless Steel Foot Plate
98256
* Power Adapter, 120VAC Input, 6VDC Output
98257
* Power Adapter, 220VAC Input, 9VDC Output
*Use only the Desco
98256
and
98257
power adapters
with the Combo Tester. Using any other power adapter
may damage the unit and void the warranty.
TECHNICAL BULLETIN TB-3069
Made in the
United States of America
Figure 1. Desco
19280
Combo Tester
