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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 • (781) 821-8370 • FAX (781) 575-0172 • http://www.charleswater.com
