DESCO EUROPE
- 2A DUNHAMS LANE, LETCHWORTH, HERTFORDSHIRE, SG6 1BE, UK
Phone: +44 (0) 1462 672005 • E-mail:
, Website:
DescoEurope.com
TB-7594
Page 1 of 2
© 2018 DESCO INDUSTRIES INC
Employee Owned
Made in the
United States of America
Portable Wrist Strap Tester
Installation, Operation and Maintenance
Description
Per EN 61340-5-1, test equipment is required to enact
the Compliance Verification Plan Requirement. Test
equipment shall be selected to make measurements of
appropriate properties of the technical requirements that
are incorporated into the ESD programme plan. The
Wrist Strap Tester can be used to fulfill
IEC 61340-4-6. “The typical verification frequency, used
by industry, for wrist cords is once per shift due to the
wrist cord’s importance to the success of the program
and the likelihood of failure.” (CLC/TR 61340-5-2
clause 4.3.3 Verification frequency). Being a portable
battery powered tool, it is perfect for small labs or
for a supervisor to spotcheck workers and/or ensure
compliance.
The Vermason
225221
Portable Wrist Strap Tester is a
battery operated “on demand” wrist strap tester. When
the wearer of a wrist strap plugs in their coiled cord and
touches the metallic surface of the Wrist Strap Tester,
a path for current flow is completed from the wearer’s
skin, through the wrist strap. This action will cause
the green “test good” LED to illuminate as long as the
resistance of the circuit path is between 750 kilohms
and 35 megohms.
Packaging
1 Wrist Strap Tester
1 9 V Alkaline Battery
1 Hook and Loop Fastener Strip
1 Certificate of Calibration
July 2018
Figure 1. Vermason
225221
Portable Wrist Strap Tester
Installation
Open the tester’s battery compartment and install
the included 9 V battery. Use the included hook and
loop fastener strip to mount the tester to a wall or
worksurface.
NOTE: The low battery indicator flashes briefly every
time the unit is used. Replace the battery once the
indicator becomes constant during testing.
Operation
1. While wearing a wrist strap, plug the wrist cord
into the wrist strap jack located on the face of the
Portable Wrist Strap Tester.
2. Push down and hold the test switch until the test
results are displayed. Ensure that your finger also
makes contact with the metal ring around the
pushbutton when performing a test.
DO NOT touch any other metal while performing
your test as this will affect your results.
3. A pass test result is indicated by illumination of the
green PASS LED. A fail low test result is indicated
by illumination of the red LOW LED. A fail high test
result is indicated by illumination of the red HIGH
LED.
If your ESD test fails, check your wrist strap and
ensure that it is being worn correctly and/or needs
to be replaced.
NOTE 1: The Portable Wrist Strap Tester may briefly
display “FAIL HIGH” once the test button is released at
the conclusion of a test. Residual voltage in the circuit’s
capacitors causes the test to continue for a split second
after the button is released.
NOTE 2: Failures may be caused by dry skin or minimal
sweat layer. For wrist straps, try using an approved
dissipative hand lotion such as
Reztore® ESD
Hand Lotion
to your wrist prior to use.
TECHNICAL BULLETIN TB-7594
