AEMC 1000N User Manual page 33

Megohmmeter Model 1000N/1100N
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Background
There are numerous standards currently being developed for measuring
conductive flooring resistance under 100V and 500V. Actual resistance
values vary from specification to specification, but 10
typical values. The following simplified procedure is an extrapolation from
the ASTM standard F 150-72. You may also refer to other sources, such
as the NFPA or EOS/ESD for alternate procedures.
General Notes
The floor sample should consist of a section covering 48 x 48 inches
(1.22 x 1.22 meters) in area.
When the sample is to be tested after installation, the test area
dimensions should not exceed a section of floor 20 x 20 feet (6 x 6
meters).
Conditioning
Whenever possible, condition the test area at least twenty-four hours at
73.4°F ±1.8°F (23°C ±1°C) and 50% ±5% RH and test under the same
conditions.
Test Procedure
1. For uninstalled panels: Place the dry specimen as described in
General Notes #1 on a nonconductive surface and lightly wipe with a
lint-free cloth to remove any foreign material prior to the placing of
the weights. Place the weights 2" (50.8 mm) in from an edge of the
sample and 36" (914.4 mm) apart. Apply 500 volts and take a
reading five seconds after application of the voltage.
2. For installed panels: Place the weights 36" (914.4 mm) apart and at
least 36" (914.4 mm) from any ground connections or grounded
object resting on the floor sample described in General Notes #2.
Apply 500 volts and take a reading five seconds after application of
the voltage.
3. Unless otherwise specified, make five measurements on each floor
section with the weights at different locations for each measurement
and record the value of two significant figures (see Figure 16).
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