EUROPE TECHNICAL BULLETIN TB-7587
High Speed, High Accuracy Tester
Installation, Operation and Maintenance
Description
Made in the
United States of America
All models of the Vermason High Speed, High Accuracy
Tester range comprise a digital test unit controlled
by a programmable IC. They can test the efficiency
of personnel grounding systems while being worn,
by measuring the resistance in the circuit including
the body of the operator. The instrument will indicate
whether the resistance is in the ranges specified in
EN 61340-5-1 using Annex A test method A.1.
Figure 1. Vermason 222562 High Speed, High Accuracy
Wrist Strap Tester
Figure 2. Vermason 222563 High Speed, High Accuracy
Wrist Strap Test Station
“All personnel shall be grounded or equipotentially
bonded … when handling ESDS [ESD sensitive
items]. When personnel are seated at ESD protective
workstations, they shall be connected to ground via
a wrist strap system” (EN 61340-5-1 clause 5.3.3
Personnel grounding)
“While wearing the wrist strap, connect the loose end
of the cord to the tester terminal and depress the test
button or touch the metal test surface with a finger or
hand. If the resistance is over 3,5 x 107 Ω, test the cord
alone for continuity. If the resistance of the cord alone
is approximately 1,0 x 106 Ω, check the fit of the band
around the wrist and adjust it for a snug fit. Snap the
cord back on the cuff and retest. If the resistance is
still over 3,5 x 107 Ω, substitute a new band.” (CLC TR
61340-5-2 User guide Wrist Strap clause 4.7.2.4.3 Test
procedure)
Wrist Strap Test Frequency
“Wrist straps should be tested periodically. The
frequency of testing, however, is driven by the amount
of usage, wear and ESD risk exposure that can occur
between tests. For, example, what is the quantity of
product handled between test periods?
Figure 3. Vermason 222564 High Speed, High Accuracy
Wrist Strap / Footwear Test Station
Typical test programs recommend that wrist straps that
are used daily should be tested daily. However, if the
products that are being produced are of such value that
a guarantee of a continuous, reliable ground is needed
then continuous monitoring should be considered or
even required.” (CLC/TR 61340-5-2 User guide Wrist
Strap clause 4.7.2.4.4 Test frequency)
NOTE 1: Electrical breakages within the cord can be
checked by flexing the cord during measurement.
Figure 4. Vermason 222565 High Speed, High Accuracy
Wrist Strap / Footwear Test Station with Output
DESCO EUROPE - 2A DUNHAMS LANE, LETCHWORTH, HERTFORDSHIRE, SG6 1BE, UK
Phone: +44 (0) 1462 672005 • E-mail: Service@DescoEurope.com, Website: DescoEurope.com
TB-7587 Page 1 of 3 July 2018
© 2018 DESCO INDUSTRIES INC
Employee Owned
If the resistance is still too high, dry skin might be
the problem. Dry skin conditions can be resolved by
applying moisturising lotion on the wrist and repeating
the resistance test again. The moisturising lotion should
be one that is compatible with process requirements
and does not cause contamination.
NOTE 2: Metal expansion bracelet style wristbands may
trap moisture underneath and can be more effective for
people with dry skin. (CLC/TR 61340-5-2 User guide
Wrist Strap clause 4.7.2.4.3 Test procedure)
The Vermason High Speed, High Accuracy Tester is
available in four models:
Item
Description
222562
Wrist Strap Tester
222563
Wrist Strap Test Station
222564
Wrist Strap / Footwear Test Station
222565
Wrist Strap / Footwear Test Station with
Output
Packaging
Item 222562
1 High Speed, High Accuracy Wrist Strap Tester
1 9 V Alkaline Battery
1 Certificate of Calibration
Item 222563
1 High Speed, High Accuracy Wrist Strap Tester
1 Wall Plate
1 9 V Alkaline Battery
1 Certificate of Calibration
Item 222564
1 High Speed, High Accuracy Wrist Strap / Footwear
Tester
1 Wall Plate
1 Foot Plate, Single Foot
1 9 V Alkaline Battery
1 Certificate of Calibration
Item 222565
1 High Speed, High Accuracy Wrist Strap / Footwear
Tester
1 Wall Plate
1 Foot Plate, Single Foot
1 Output Cable
1 9 V Alkaline Battery
1 Certificate of Calibration
3. If applicable, set the foot plate below the tester.
4. If applicable, connect the footwear lead at the
bottom of the tester to the foot plate.
222565 WRIST STRAP / FOOTWEAR TEST STATION
WITH OUTPUT
The 222565 tester features a relay terminal that can be
integrated with electronic door locks, lights, buzzers, etc.
It is capable of switching up to 0.5 A @ 50 VDC.
An Output Cable with stripped ends is included with the
tester to help you wire your device to the tester’s relay
terminal. The list below describes the relay contacts for
each wire.
White Wire = Normally Closed
Black Wire = Normally Open
Red Wire = Common
Operation
WRIST STRAP
1. Snap the coiled cord to the wristband and fit it
snugly onto the wrist.
2. Connect the other end of the wrist cord to a
matching termination on the tester.
3. Push and hold the test button until a result is
displayed.
A green LED with buzzer indicates a PASS
condition. A red LED indicates a FAIL condition.
Replace battery if the LOW BATTERY LED
illuminates.
FOOTWEAR
1. ESD Footwear covers heel grounders, toe
grounders and ESD shoes/boots.
2. Place one foot on the foot plate and raise the other
off the floor.
3. Push and hold the test button until a result is
displayed.
A green LED with buzzer indicates a PASS
condition. A red LED indicates a FAIL condition.
Replace battery if the LOW BATTERY LED
illuminates.
4. Repeat Steps 2-3 for the other foot.
Installation
1. Insert the 9 V battery into the tester.
2. If applicable, install the tester at the desired location
using the four mounting holes in the corners of
the yellow wall plate.
DESCO EUROPE - 2A DUNHAMS LANE, LETCHWORTH, HERTFORDSHIRE, SG6 1BE, UK
Phone: +44 (0) 1462 672005 • E-mail: Service@DescoEurope.com, Website: DescoEurope.com
TB-7587 Page 2 of 3
© 2018 DESCO INDUSTRIES INC
Employee Owned
Calibration
A periodic check (once every 6 to 12 months) using a
precision resistance box should be performed to verify
proper operation.
The Vermason 222547 Calibration Unit is available for
the periodic testing of the High Speed, High Accuracy
Testers.
Limited Warranty, Warranty Exclusions, Limit
of Liability and RMA Request Instructions
See the Desco Europe Warranty DescoEurope.com/Limited-Warranty.aspx
The Calibration Unit can be used in the test location
within a few minutes virtually eliminating downtime,
verifying that the High Speed, High Accuracy Tester is
operating within tolerances.
See TB-7581 for more information.
Figure 5. Vermason 222547 Calibration Unit
Specifications
Wrist Strap Limit
750 kilohm - 35 megohm
Footwear Limit
750 kilohm - 35 megohm
Accuracy
±10 %
Test Voltage
24 VDC
Dimensions
Tester
146 mm x 91 mm x 33 mm
Wall Plate
300 mm x 600 mm x 3 mm
Foot Plate
420 mm x 220 mm x 3 mm
Weight
0.3 kg (including battery and wall
plate)
Power Supply
9 V battery or one of the following
power adapters:
19262
Battery Life
approximately 3,000 tests
(3 seconds per test)
DESCO EUROPE - 2A DUNHAMS LANE, LETCHWORTH, HERTFORDSHIRE, SG6 1BE, UK
Phone: +44 (0) 1462 672005 • E-mail: Service@DescoEurope.com, Website: DescoEurope.com
TB-7587 Page 3 of 3
© 2018 DESCO INDUSTRIES INC
Employee Owned
