Desco의 Touch Tester 규격서

—— DESCD
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
• Suitableforindooruseonlyataltitudesnotexceeding6500ft.
(2Km)
• Temperaturerangeof41°F(5°C)to104°F(40°C)
• Maximumrelativehumidityof80%upto88°F(31°C)decreasing
linearlyto50%@104°F(40°C)
• Pollutiondegree2perIEC664
• InstallationCategoryII
CAUTION:Ifthisequipmentisusedinamannernotspecifiedby
themanufacturer,theprotectionprovidebytheequipmentmaybe
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-2004August2015Page1of3
TECHNICAL BULLETIN TB-2004
Touch Tester - Operation,Installation
and Calibration Instructions
Pass Range: 750 kilohms to 10 megohms
Description
PerANSI/ESDS20.20,testequipmentisrequiredtoenact
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program
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
actionwillcausethegreen“testgood”LEDtolight(andtheoptional
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
besnappeddirectlytoamat.Inthisconfiguration,theunitprovides
a common-point ground for both the mat and the wrist strap, and is
easilyaccessibleforfrequenttesting.Apieceofadhesivebacked
hook and loop fastener is provided for the user as an alternative
mounting method preventing the tester from rotating.
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
Madeinthe
UnitedStatesofAmerica
©2015DESCOINDUSTRIESINC.
EmployeeOwned
Figure 1. Model 19350 Wrist Strap Tester / Common Point Ground
WRISTSTRAP
GROUND(09740)
19350
Figure 2. 19350 Testing Circuit
Figure 3. Testing a wrist strap
Figure 4. Installation of Touch Tester
Limited Warranty, Warranty Exclusions, Limit of
Operation
When the Touch Tester’s power supply is plugged into a grounded
outlettheredLEDwillbeon,indicatingthattheunitispowered.The
utilitygroundisinternallyconnectedtothe.395”(10mm)snapstud
on the back of the unit and to the 2 banana jacks at the bottom edge
of the tester.
TB-2004Page2of2
Audible Option
Ifdesired,theTouchTesterwillaugmentthevisual“testgood”
indicatorwithanaudiblesignal.Inthe“on”position,thetesterwill
beepwhenthegreen“testgood”LEDison,therebyallowingthe
operatortofrequentlytestthewristbandandcordwithouthavingto
look at the tester.
Toenable/disablethesignal,aslideswitchisaccessiblethroughthe
holeonthebackoftheunit.First,unplugthepowersupply.Actuate
the switch with a small probing tool, being careful to avoid internal
damage.
GROUND
POINTS
Banana
Jacks
10mm
SnapStud
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
©2015DESCOINDUSTRIESINC.
EmployeeOwned
ATTACHMENT
ALTERNATIVES
HOOK&LOOP
FASTENER
SNAPS
CONNECTOR
FORP-6911
ACADAPTER
Figure 5. Attachment alternatives
A wrist strap is plugged into one of the banana jacks or into any
common grounding point. When the wearer of a wrist strap touches
themetallictestsurface,thegreen“testgood”LEDwilllightif
the operator-to-ground resistance is between 750k ohms and 10
megohms.
Proper Ground
The integrity of the utility ground must be tested before the Touch
Tester is plugged in. The Touch Tester utilizes the “green wire”
groundasthestaticground.Eachoutletmustbetestedforproper
groundingpriortouse.Outletscanbecomeungroundedovertime
due to corrosion, wear, or vibration.
Desco recommends the 98132ACOutletAnalyzer&WristStrap
Tester when testing electrical outlets for proper grounding and wiring.
See Technical Bulletin TB-2099 for more information.
Figure 7. Ground points
Figure 8. Accessing the audible signal
DCOutput
IECInput
Figure 6. AC Adapter, 220 Volt
Calibration
We recommend annual calibration of our testers. The model 19350 is
calibratedtoNISTtraceablestandards.Calibrationmaybeperformed
to ensure that the tester is operating within limits.
Desco offers a calibration unit that is specifically designed to simplify
the calibration procedure. This unit is sold as item 07010. The 07010
comescalibratedtoNISTtraceablestandards.AskforTechnical
Bulletin TB-2039 for detailed procedure to calibrate the 19350.
Specifications
OperatingVoltage 6 VDC
OperatingTemperature 32°Fto104°F(0to40°C)
WristStrapTestLimit: 750kilohmsto10megohms
TestAccuracy: ±20%
TestVoltage 4VDC
Dimensions 2.9"x2.1"x0.8"
Weight 0.1 lbs
Limited Warranty, Warranty Exclusions, Limit of
Liability and RMA Request Instructions
SeeDesco Terms and Conditions