When measureing point to point resistance (Rtt):
l
Place two electrodes no closer than 2" from the
edge of the surface being measured.
l
Place two electrodes no closer than 3" to any
groundable point.
l
Place two electrodes about 10" apart from each
other for Rtt measurements of a worksurface.
l
Place two electrodes about 3' apart from each
other for Rtt measurement of a floor.
Preferable electrode placements include:
l
Most commonly used area of a surface
l
Most worn area
l
Center of surface
l
Furthest area from a grounded point
If the surface to be measured has sections (i.e. floor
tiles, garment panels), place two electrodes on
different sections for Rtt measurements.
Clean the material
’
s surface for test lab
measurements, but do not clean the surface for
materials that are already installed. Only clean and
re-test the installed material if failure occurs.
Measure Resistance-to-Ground (Rtg)
Test Procedure in accordance with ANSI/ESD S4.1
section 6.4 Periodic Worksurface Testing:
1. Do not clean the surface.
2. Remove from the surface only those items that
might interfere with the test. ESD sensitive
devices shall also be removed.
3. Connect the black test lead to a grounded point.
4. Connect the red test lead to the Single-Surface-
Electrode, then place the electrode on the furthest
convenient point on the surface.
5. Push the red pushbutton to perform a test.
Should the 15-second electrification period
appear, it may be bypassed by pushing the red
pushbutton a second time.
6. Push the right black pushbutton to save the
Measurement if desired.
7. Perform additional measurements by placing the
electrode on the most commonly used or worn
area.
SCS
- 926 JR Industrial Drive, Sanford, NC 27332
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•
Website:
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TB-9092
Page 5 of 8 December 2019
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2019 DESCO INDUSTRIES INC
Employee Owned
Measure Resistance Point-to-Point (Rtt) on the
Surface
1. Do not clean the surface.
2. Remove from the surface only those items that
might interfere with the test. ESD sensitive
devices shall also be removed.
3. Connect one test lead to the Single-Surface-
Electrode, another test lead to the Dual-Surface-
Electrode
’
s black jack, then place two electrodes
on the most commonly used area of the surface.
4. The disk side of the Dual-Surface-Electrode
should be used in this kind of test.
5. The electrodes should also be 2" away from any
edge and 3" away from any grounded point. If
the most used area is not obvious, use two
points near the center of the surface.
6. Push the red pushbutton to perform a test.
Should the 15-second electrification period
appear, it may be bypassed by pushing the red
pushbutton a second time.
7. Push the right black pushbutton to save the
measurement if desired.
8.
Perform additional measurements by placing the
electrode on the most commonly used or worn
area.
Measure Surface Resistance and Resistivity
1. Place the material to be tested on an insulative
surface.
2. Place the Dual-Surface-Electrode on top of the
material to be tested. The concentric ring side
should be used in this kind of test.
3. Connect both test leads to the Dual-Surface-
Electrode
’
s black and white jacks.
4. Push the red pushbutton to perform a test.
Should the 15-second electrification period
appear, it may be bypassed by pushing the red
pushbutton a second time.
5. Push the right black pushbutton to save the
measurement if desired.
