Desco 19784 Service manual

DESCO WEST - 3651 Walnut Avenue, Chino, CA 91710 • [phone]
DESCO EAST - One Colgate Way, Canton, MA 02021-1407 • [phone] • Website: Desco.com
TB-3046 Page 1 of 4 © 2016 DESCO INDUSTRIES, INC.
Employee Owned
Analog Surface Resistance Test Kit
Operation and Maintenance
Description
The Desco Analog Surface Resistance Test Kit is
a portable battery-powered instrument designed to
measure resistance point-to-point (RTT) and surface to
ground (RTG). The meter is equipped with an automatic
test voltage selector. The test voltage will switch from
10V to 100V should the measured resistance exceed 1 x
105 ohms.
ESD protected area products should be tested:
A. Prior to installation to qualify for listing in user’s ESD
control plan. Approved ESD materials (see product
 qualicationtableatANSI/ESDS20.20Table3 
EPA ESD control items)
B. During initial installation
C. For periodic checks of installed products as part of
 ANSI/ESDS20.20ComplianceVericationtesting
per ESD TR53.
Compliance Verication Plan
“AComplianceVericationPlanshallbeestablished
toensuretheOrganization’sfulllmentofthetechnical
requirements of the ESD Control Program Plan.
Process monitoring (measurements) shall be conducted
inaccordancewithaComplianceVericationPlanthat
identiesthetechnicalrequirementstobeveried,the
measurement limits and the frequency at which those
vericationsshalloccur.TheComplianceVerication
Plan shall document the test methods and equipment
usedforprocessmonitoringandmeasurements.If
thetestmethodsusedbytheOrganizationdi󰀨erfrom
any of the standards referenced in the document, then
there must be a tailoring statement that is documented
as part of the ESD Control Program Plan. Compliance
vericationrecordsshallbeestablishedandmaintained
to provide evidence of conformity to the technical
requirements.
The test equipment selected shall be capable of
makingthemeasurementsdenedintheCompliance
VericationPlan.”(ANSI/ESDS20.20section7.3)
The Analog Surface Resistance Meter and its
accessories are available as the following item numbers:
Figure 1. Desco 19784 Analog Surface Resistance Test
Kit
August 2016
Item Description
19784 Analog Surface Resistance Test Kit
(TestLeadsandElectrodesIncluded)
19786 Analog Surface Resistance Meter
19785 Shielded Test Leads
50003 5 Pound Electrodes
50005 Concentric Ring Probe
Packaging
19784 Analog Surface Resistance Test Kit
1 Analog Surface Resistance Meter
1 9V Alkaline Battery
2 Shielded Test Leads
2 Five Pound Electrodes
1 Plastic Carrying Case
1 CerticateofCalibration
19786 Analog Surface Resistance Meter
1 Analog Surface Resistance Meter
1 9V Alkaline Battery
1 CerticateofCalibration
Made in the
United States of America
TECHNICAL BULLETIN TB-3046

DESCO WEST - 3651 Walnut Avenue, Chino, CA 91710 • [phone]
DESCO EAST - One Colgate Way, Canton, MA 02021-1407 • [phone] • Website: Desco.com
TB-3046 Page 2 of 4 © 2016 DESCO INDUSTRIES, INC.
Employee Owned
Features and Components 4. Use one 5 pound electrode on the other test lead
and place it at the center of the surface.
5. Set the Test Voltage Button to AUTO. Press and
hold the the TEST button until the measurement is
displayed (see Figure 3).
6. Perform additional measurements by placing the
electrode on the most commonly used or worn
areas.
CAUTION:Ifthereisacurrentlimitingresistorinthe
worksurface and the worksurface resistance is lower,
the measurement will primarily be the resistance of the
resistor.ItisrecommendedtomeasureRTTparticularly
if the material color is black.
A. Analog Display: Displays surface resistance
measurements from
1 x 103 - 1 x 1013 ohms.
B. Resistance Property LEDs: Color-coded LEDs that
provide quick-check resistance indicators.
C. Test Button: Hold this button down to operate the
Analog Surface Resistance meter.
D. Low Battery LED:Illuminateswhenthebattery
power drops to 4.0V (±0.1V).
E. Test Voltage Button: Test voltage will automatically
switch from 10V to 100V when set to AUTO. Test
voltage will stay at 10V HOLD when set to 10V.
Operation
Compliance Verication Test Procedure Guideline
The ESD Association lists test procedures and
troubleshootingtipsinComplianceVericationESD
TR53.
NOTE:ThetestkitcanbeusedtomeasureRTGand
RTTofshelves,garments,oorandcartworksurfaces
using test procedures similar to worksurfaces and foot
grounders.
MEASURE WORKSURFACE RESISTANCE TO
GROUND (RTG)
1. Do not clean the surface.
2. Remove all ESD sensitive items from the surface
and items that might interfere with the test.
3. Connect one lead banana plug to ground.
Figure 2. Analog Surface Resistance Meter features and
components
A
B
E
D
C
Figure 3. Using the test leads and one 5 pound electrode
to measure RTG
MEASURE WORKSURFACE RESISTANCE POINT-TO-
POINT ON THE SURFACE (RTT)
1. Do not clean the surface.
2. Remove all ESD sensitive items from the surface
and items that might interfere with the test.
3. Use two 5 pound electrodes and place them 10"
apart on the most frequently used area of the
surface (2" from any edge, 3" from any groundable
point).
4. Ifthemostusedareaofthesurfaceisnotobvious,
use two points near the center of the surface.
5. Set the Test Voltage Button to AUTO. Press and
hold the TEST button until the measurement is
displayed (see Figure 4).

DESCO WEST - 3651 Walnut Avenue, Chino, CA 91710 • [phone]
DESCO EAST - One Colgate Way, Canton, MA 02021-1407 • [phone] • Website: Desco.com
TB-3046 Page 3 of 4 © 2016 DESCO INDUSTRIES, INC.
Employee Owned
Ifthemeasurementisoutsideacceptablelimits,clean
the surface and re-test to determine if the cause of
failure is an insulative dirt layer or the ESD worksurface
material.NOTE:UseanESDcleanercontainingno
insulative silicone (i.e. Desco 10435 Reztore™ Antistatic
Surface and Mat Cleaner).
• Seating - “The recommended electrical resistance range
for seating is less than E9 ohms as tested in accordance
withANSI/ESDSTM12.1.Thisvalueshouldbeduring
acceptancetesting,installationandperiodicallythereafter.”
(see ESD TR20.20 section 5.3.5.3 Testing)
• Garments - “ESD TR53 describes periodic verification test
methods and trouble shooting for garments. The sleeve
to sleeve resistance test should be made to ensure proper
resistance range through the entire garment. Alternately,
the garment while worn can be tested using a wrist strap
tester.”(ESDHandbookESDTR20.20-2008section
5.3.13.3.1.7 Periodic Verification Testing)
Maintenance
The area surrounding the cable jacks at the top end of the
meter should be wiped with a clean cloth moistened with
alcohol to remove skin oils that will accumulate and affect the
accuracy at high resistances. The frequency of cleaning will
depend on usage; once a month would be a good starting
point.
PerANSI/ESDS4.1“Cleantheelectrodeswithaminimum
70%isopropanol-watersolution.”Makesureconductive
pads are dry prior to use.
The Analog Surface Resistance Meter requires little
maintenance,andtherearenouserserviceableparts.If
your unit requires service beyond cleaning the electrodes
or replacing the batteries, please contact Desco Customer
Service.
RECOMMENDED FREQUENCY OF PERIODIC
COMPLIANCE VERIFICATION OF INSTALLED
PRODUCTS
The ESD Association lists test procedures and
troubleshooting tips in Compliance Verification ESD TR53.
NOTE:“Thefrequencyofperiodictestingisnormally
specified in corporate operating procedures. …The frequency
of testing is driven by the amount of risk exposure that can
occur between tests. For example, what is the quantity of
producthandledbetweentestperiods?”(SeeESDHandbook
ESD TR20.20)
A GUIDE FOR PERIODIC TESTING
• Worksurface, Carts, Shelves - at least quarterly (see ESD
TR20.20 section 5.3.1.13 Periodic Tests)
• Footwear-“Incominginspectiononalotsamplingbasis
shouldbeperformedforallstaticcontrolfootwear.”(see
ESD TR20.20 section 5.3.3.4 Testing)
• Floor-“Insomecases,asimpleelectricalresistance
testwithamegohmmetermaysuffice.Inothers,astatic
charge generation test may be required. The frequency of
testing is also a consideration. Some materials, such as
floor finishes, may require more frequent testing because
oftheirlackofpermanency.”(seeESDTR20.20section
5.3.4.15.1.4)
Figure 4. Using the test leads and two 5 pound
electrodes to measure RTT of worksurfaces (place
electrodes 3 feet apart for ooring)
10"

DESCO WEST - 3651 Walnut Avenue, Chino, CA 91710 • [phone]
DESCO EAST - One Colgate Way, Canton, MA 02021-1407 • [phone] • Website: Desco.com
TB-3046 Page 4 of 4 © 2016 DESCO INDUSTRIES, INC.
Employee Owned
Limited Warranty, Warranty Exclusions, Limit of
Liability and RMA Request Instructions
See the Desco Limited Warranty
http://desco.descoindustries.com/Limited-Warranty.aspx
Specications
Resistance Ranges 1 x 103to 1 x 1013 ohms @
10Volts,complieswithANSI/
ESD S4.1
1 x 106to 1 x 1013 ohms @
100Volts,complieswithANSI/
ESD S4.1
Accuracy ±1/2decade
Power Supply 9V alkaline battery
Operating Temperature 41ºF to 85ºF (5ºC to 30ºC)
Environmental
Requirements
Indooruseonlyataltitudes
less than 6500 ft. (2 km)
Maximum relative humidity of
80% up to 85°F (30°C)
Meter Dimensions 4.5" x 2.8" x 2.1"
(11 cm x 7 cm x 5 cm)
Meter Weight 0.5 lbs (0.2 kg)
Carrying Case Kit
Dimensions
9.5" x 12.0" x 3.5"
(24 cm x 30 cm x 9 cm)
Carrying Case Kit
Weight
12.0 lbs (5.4 kg)
External Electrode 5 lbs (±2 oz), 2.5" in diameter
complieswithANSI/ESDS4.1