The hook-and-loop type fastener also allows fast mounting to smooth
surfaces. This method is convenient for mounting the tester on a
workstation leg or on an upright support for shelving or lights. (Note -
the snap does not have to be connected for proper grounding).
Equipment Rating:
AC Adapter rated 120 Vac, 60 Hz, 6 W.
Ground Touch Tester rated 6.5 Vdc, 50 mA.
Environmental Conditions
Suitableforindooruseonlyataltitudesnotexceeding6500ft.
(2Km)
Temperaturerangeof41°F(5°C)to104°F(40°C)
Maximumrelativehumidityof80%upto88°F(31°C)decreasing
linearlyto50%@104°F(40°C)
Pollutiondegree2perIEC664
InstallationCategoryII
CAUTION:Ifthisequipmentisusedinamannernotspecifiedby
themanufacturer,theprotectionprovidebytheequipmentmaybe
impaired.
The wrist strap being tested may be plugged directly to the tester
or any convenient common ground point. The wrist strap will test
properly as long as both the Touch Tester and the wrist strap are
connected to a common ground. Therefore, any number of wrist strap
wearers may use the Touch Tester if they can conveniently reach
it. Desco item
09740 provides two banana jacks for grounding wrist
straps.
When the Touch Tester and a
09740 are tied to a common ground
(utility ground) wrist straps plugged into the
09740 can also be tested.
TB-2004February2014Page1of3
TECHNICAL BULLETIN TB-2004
Touch Tester - Operation,Installation
and Calibration Instructions
Pass Range 750K Ohms to 10 Megohm 120VAC Operation
Description
PerANSI/ESDS20.20,testequipmentisrequiredtoenact
ComplianceVerificationPlanRequirement.Testequipmentshall
be selected to make measurements of appropriate properties of the
technicalrequirementsthatareincorporatedintotheESDprogram
plan.
The Touch Tester is an “on demand” wrist strap tester that also
functions as a common-point ground for two wrist straps and a mat.
When the wearer of a wrist strap touches the metallic surface of the
Touch Tester, a path for current flow is completed from the wearer’s
skin, through the wrist strap, to the metallic surface to ground. This
actionwillcausethegreen“testgood”LEDtolight(andtheoptional
audible signal to sound) as long as the resistance of the circuit path
is between 750k ohms and 10 megohms.
Installation
The Touch Tester is easily attached at the workstation. A snap stud
at ground reference is provided on the back of the unit, allowing it to
besnappeddirectlytoamat.Inthisconfiguration,theunitprovides
a common-point ground for both the mat and the wrist strap, and is
easilyaccessibleforfrequenttesting.Apieceofadhesivebacked
hook and loop fastener is provided for the user as an alternative
mounting method preventing the tester from rotating.
DESCO WEST -3651WalnutAvenue,Chino,CA91710(909)627-8178
DESCO EAST - OneColgateWay,Canton,MA02021-1407(781)821-8370WebSite:
Desco.com Madeinthe
UnitedStatesofAmerica
2014DESCOINDUSTRIESINC.
EmployeeOwned
Figure 1. Model 19350 Wrist Strap Tester / Common Point Ground
WRISTSTRAP
GROUND(09740)
19350
Figure 2. 19350 Testing Circuit Figure 3. Testing a wrist strap
Figure 4. Installation of Touch Tester