CharlesWater 19770 Installation guide

PP-5032 8/98 Page 1 of 4
TECHNICAL BULLETIN
Digital Surface Resistance/Resistivity Test Kit
Operation and Maintenance
Description
Figure 1. Charleswater Item No. 19770
The Digital Surface Resistance/Resistivity Test Kit is a
portable instrument designed to measure resistance
between two points (RTT), surface to ground (RTG), and
surface resistivity in complete accordance with EOS/ESD
Association Standard S-4.1. This unit is suitable for
evaluating the electrical properties of ESD protective work
surfaces and flooring products.
Figure 2. Parallel Resistivity Electrodes on bottom of meter.
The meter has two parallel probes on the bottom of the
case which measure surface resistivity. These parallel
electrodes allow for quick and easy testing of a variety of
surfaces and materials without the use of external probes.
Recommended Literature
Charleswater recommends that you read the following
standards from the ESD Association:
Description Charleswater Item #
EOS/ESD-ADV1.0 — Glossary of Terms 10151
EOS/ESD-S4.1 — Worksurfaces 10154
EOS/ESD-S6.1 — Grounding 10156
ESD-S7.1 — Floor Materials 10157
ESD-S11.11 — Surface Resistivity 10161
These documents are available from Charleswater and they
can also be obtained directly from the ESD Association,
7902 Turin Road, Suite 4, Rome, NY 13440-2069, (315)
359-6937.
In addition to the Association Standards listed previously,
anyone testing the electrical properties of ESD protective
surfaces should also obtain copies of:
MIL-HDBK 263A EIA-IS-5-A ASTM-F-150
ASTM-D257 EN 100015
These standards are available from the agencies who
produce them. If you need help in obtaining these
documents contact our customer service department at
781-821-8370.
Inspection
Remove the meter from the carton and inspect for damage.
Each unit should include the following:
1 Protective carrying case
1 LCD display meter
2 Test leads
2 5-pound weighted electrodes
1 Grounding clip
1 AC adapter/charger
1 PP-5032 Tech Brief
1 Rechargeable battery
Properly store the meter and component assemblies when
not in use. Do not charge battery unless it is fully
discharged. Doing so will reduce the life of the battery.
CHARLESWATER • 90 HUDSON ROAD, CANTON, MA 02021 • [phone] • FAX [phone] • http://www.charleswater.com

PP-5032 Page 2 of 4
Features
A. Scale: 1/2" high digital LCD display
provides easy to read
resistivity/resistance measurements.
Values are expressed with a mantissa
and exponent power as shown in
Figure 3. Display shows 1.7x105
Ohms/sq.
B. Test Button: This button turns on
the power to the meter. When released
the measured reading will remain
illuminated for 10-20 seconds.
C. Test Range Voltage Switch:
10 Volts for 1x103- 1x1011 ohms
100 volts for 1x106- 1x1012 ohms
D. Jacks: 2.5mm mini phone plugs will
fit the meter jacks. Banana plugs will fit
the test probes. Banana plugs will not
fit the meter jacks.
E. AC-Battery Charger Adapter:
12 volts DC - 200mA.
F. 9 Volt Battery Compartment.
G. Parallel Electrodes: For surface
resistivity measurements only.
Figure 4.
If the value of the measurement is
below 1000 Ohms on the 10 volt scale
or 1x106on the 100 volt scale an “L”
will appear on the LCD display.
Figure 5.
If the value of the measurement is over
5x1012 Ohms an “H” will appear on the
LCD display.
Figure 6.
A “P” will appear on the LCD display if
there is too much electrical 60Hz noise
in the area or if a test is performed on
a high open resistance.
Figure 7. Low Battery Indicator
When the unit’s batteries need
recharging a “BAL” will appear on the
LCD display as the meter is being
operated. To maximize the life of the
battery do not recharge until a low
battery “BAL” is displayed.
A
B
E
D
G
C
F
Figure 3. Features of the Digital Surface Resistance/Resistivity Meter
CANTON, MA 02021
Made in USA
CHARLESWATER • 90 HUDSON ROAD, CANTON, MA 02021 • [phone] • FAX [phone] • http://www.charleswater.com
19770

PP-5032 Page 3 of 4
Figure 8. Clean before testing.
Work surfaces or materials to be tested should be cleaned
prior to testing to ensure that surface dirt and contamination
do not affect the test results. Periodically clean the built-in
parallel electrodes and the two 5 lb. conductive rubber
probe electrode surfaces. Use solvent-free rubber cleaners.
We recommend using an antistatic cleaner like Charlewater
Reztore Mat Cleaner, Part No. 10422. Be sure the surface
is dry before testing.
Power Requirements
The unit is powered by a rechargeable 9 volt DC
Nickel/Cadmium battery, an alkaline battery, or a special 12
volt DC, 200mA adapter. The AC to DC adapter is also
used to recharge the 9 volt battery.
Surface Resistance Measurements (RTT)
Complies with EOS/ESD-S4.1
Point to point surface resistance measurements are made
using the meter along with both of the 5 pound weight
electrodes. This test will determine the resistance between
two points, independent of a groundable point. The charge
dissipation rate of all ESD protective materials is related
directly to electrical resistance to ground. To perform
surface resistance tests you must first determine what test
procedure you will be using. The test procedure will help
you to determine proper preparation of the material to be
tested and the spacing of the weights. Once testing
parameters are determined you can proceed with the
following instructions:
A. Connect the test leads to the meter by inserting the
banana termination end of a test lead into the weighted
electrode and the mini phone plug end into the meter.
B. Place both electrodes on the material at positions
determined by the procedure selected. Set the meter to the
required test voltage determined by the test procedure and
the resistance of the material.
C. Press and hold the test button until the resistance value
appears on the display. Record the reading and test
voltage. This reading will be Ohms (resistance).
Figure 9. Setting up for RTT testing
Surface-to-Ground Measurements (RTG)
Complies with EOS/ESD-S4.1
The Surface-to-Ground measurements will indicate the
surface resistance between selected locations on a work
surface and a groundable point or points. Ground points are
usually in the form of snaps installed on the material so that
the material can be grounded via ground cords. The charge
dissipation rate of all ESD protective materials is related
directly to electrical resistance to ground. When making
Surface-to-Ground measurements, follow this prodedure:
A. Connect one of the 5 pound electrodes to the meter
using one of the test leads.
Figure 10. Setting up for RTG testing.
B. Using the other test lead connect the mini phone plug
end to the meter. Insert the grounding clip, included, onto
the banana plug on the other end of the lead. Now connect
the grounding clip to the groundable point on the surface to
be tested.
CHARLESWATER • 90 HUDSON ROAD, CANTON, MA 02021 • [phone] • FAX [phone] • http://www.charleswater.com

PP-5032 Page 4 of 4
DESCO INDUSTRIES INC.
Employee Owned
C. Position the electrode on the material at the position
specified by the procedure selected. Set the meter to the
desired test voltage range. Be sure to keep the cords
separated in order to prevent false readings especially
when testing high resistance materials.
D. Press the red test button. Wait 15 seconds, then read the
resistance value as indicated on the display. Record the
reading and test voltage. This reading will be Ohms
(resistance).
E. Repeat procedure on the other points on the material
under test.
Surface Resistivity Measurements -
Quick Reference
Complies with EOS/ESD-S11.11-1993
A. Using the build in external parallel probes, place the
meter on the material at the position specified by the
procedure selected.
B. Press the test button. Wait 15 seconds and then record
the reading and test voltage indicated by the meter’s
display. This reading will be in Ohms/sq. (resistivity).
Maintenance
Your Surface Resistance Test Kit will require little
maintenance, and there are no user serviceable parts. If
your meter requires service beyond cleaning the probes or
replacing or recharging the battery, please contact the
factory.
Calibration
The 19770 Digital Surface Resistance Test Kit is calibrated
to NIST traceable standards. Any units requiring calibration
should be returned to the factory. Please call or fax our
Customer Service Department for information on factory
calibration.
In-house calibration can be performed by using 1% resistors
in each of the meter ranges. Simply attach the resistors to
the enclosed cords using grounding clips and recording the
meter display. Keep the cords separated. Adjustments to
the internal resistance pots can be done quite easily.
Request this procedure from the Charleswater Customer
Service Department.
Limited Warranty
Charleswater expressly warrants that for a period of one (1) year from
the date of purchase, Charleswater 19770 Test Kits will be free of
defects in material (parts) and workmanship (labor). Within the warranty
period, the 19770 Test Kit will be replaced at Charleswater’s option, free
of charge. Any unit under warranty should be shipped prepaid to the
Charleswater factory, call Customer Service at 781-821-8370 for proper
shipping instructions and address. Include a copy of your original
packing slip, invoice, or other proof of purchase date. Warranty repairs
will take approximately ten days.
Warranty Exclusions
THE FOREGOING EXPRESS WARRANTY IS MADE IN LIEU OF ALL
OTHER PRODUCT WARRANTIES, EXPRESSED AND IMPLIED,
INCLUDING MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE WHICH ARE SPECIFICALLY DISCLAIMED. The express
warranty will not apply to defects or damage due to accidents, neglect,
misuse, alterations, operator error, or failure to properly maintain, clean
or repair products.
Limit of Liability
In no event will Charleswater or any seller be responsible or liable for
any injury, loss or damage, direct or consequential, arising out of the use
of or the inability to use the product. Before using, users shall determine
the suitability of the product for their intended use, and users assume all
risk and liability whatsoever in connection therewith.
Specifications
Ranges: 1x103- 1x1011 Ohms @ 10 Volts
1x106- 1x1012 Ohms @ 100 Volts
Power Supply: 9 volt rechargeable
nickel/cadmium
battery and charger/adapter
included. Alkaline battery optional.
Battery Life: Ni-Cad - 1 hour
Alkaline - 8 hours
Charge Time - 12 hours
Adapter Output: 12 volt DC - 200mA
Use only with rechargeable battery
Current Electrodes: Internal - Two parallel conductive
silicone rubber replaceable
electrodes
External - Two 5-pound weight
electrodes, 2.5" in diameter,
complies with EOS/ESD-S4.1
Operating Conditions: 60°F - 80°F, 10-50% RH
Display: One six character .500" LCD
display
Accuracy: 103- 109= ±15% at 10-90% RH
109- 1011 = ±20% at 10-60% RH
1011 - 1012 = ±30% at 10-50% RH
Meter Weight: 13 oz.
Charger Weight: 11 oz.
Dimensions: 7.5"L x 4"W x 1.75"H
Power Switch: Momentary on. Releasing the
switch will hold and display for
>10 seconds.
CHARLESWATER • 90 HUDSON ROAD, CANTON, MA 02021 • [phone] • FAX [phone] • http://www.charleswater.com