Electro-Tech systems 204 Operating Manual page 9

The test set up consists of the Model 204 with the Detector attached.
Connect either a wrist strap or a cable with probe. The test subject puts
on the wrist strap or grasps the probe. The tripod can be used to hold the
instrument.
Before starting the test, both the test subject and meter should be
momentarily grounded. The voltage displayed on the meter will be the
voltage generated by the test subject during the activity.
4.3 Triboelectric Charge Analysis
This test uses the Charged Plate Detector plus the 6"x6" (152x152mm)
detector plate. The assembly is mounted onto the tripod with the plate in
the horizontal position. Momentarily ground the detector plate. Take the
material being tested and rub it with an appropriate second material.
Place the test material on the detector plate. The voltage measured is a
relative indication of the antistatic characteristics of the material.
The test procedure can also be used to measure the build-up of static
charge on material, objects, liquids and powders in motion by connecting
the appropriate probes or test leads from the object or isolated detector
(for powders and liquids in a contained environment) to the detector
plate.
4.4 Static Dissipation of Material and Objects
The built-in timer is activated only when the CHARGE button is
depressed and then it only measures dissipation time from 1000 to 100V
up to 60 seconds. For measurements that do not require the application
of voltage (Triboelectrically charged material, for example), having
voltage levels less than 1000V or having dissipation times greater than 60
seconds the timer cannot be used. An external timing device such as an
oscilloscope or chart recorder connected to the RECORDER output or a
stopwatch will be required.
If the decay time is less than 60 seconds and the sample can be
conductively charged by the charging source then the internal timer can
be used.
If very quick decay times are required (<1 sec.) then the optional 6-
second version with 0.03 second resolution should be used.
If the decay time of the sample, after being grounded, is desired first
place the charged sample on the detector plate, then connect a ground
lead to the sample, NOT TO THE PLATE.
To measure the decay time of a sample that is either conductive or
dissipative, place it on the detector plate. Charge it by depressing the
CHARGE button and holding it for several seconds to ensure the sample
is charged to the full voltage. Connect a ground lead to the sample. The
Analyzer will measure the time for the detector plate and sample to
dissipate its charge.
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