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Another dissipation test is to charge the detector plate and then place a
grounded sample on the plate and measure the time for the plate to
dissipate its charge through the sample.
4.4
Charge Neutralization Time
This test measures the time for an ionizer to neutralize a charge on an
object. It is also referred to as "Discharge Time". This test can be
performed with either the standard detector or with the 6"x6"
(152x152mm) plate.
Turn on the ionizer and allow it to run long enough to stabilize. Hold the
Analyzer 12" (305mm) or other specified distance away from the front of
the ionizer. Momentarily ground the detector plate then depress either the
+ or – CHARGE button. The red LED indicator will light and the plate will
charge up to approximately 1150 Volts. Release the CHARGE button.
The ionizer will immediately start to neutralize the charge on the plate.
When the charge drops to 1000V the built-in timer starts and the unit will
start measuring the time for the charge on the plate to bleed down to
100V. When the voltage on the plate reaches 100V the meter switches
over from reading voltage to reading time as indicated by the yellow
"TIME-SEC" LED. Depressing the ZERO/RESET pushbutton grounds the
detector plate and resets the timer.
4.5
Static Dissipation of Personnel
This test measures the time it takes a charged person to bleed off the
charge when a static control procedure is implemented such as stepping
onto a conductive floor or sitting down in a conductive chair. The above
test set up, without the 6"x6" (152x152mm) detector plate is used. The
test subject is connected to the detector plate using a wrist strap or a
probe assembly.
Momentarily ground the detector plate and test subject. Depress the
CHARGE button to charge both plate and test subject. The meter should
indicate a reading of approximately 1150V. The test subject must be
standing on an insulated surface during charging. The test subject should
then immediately step onto the surface being evaluated. The Analyzer will
measure the time for the voltage on the test subject to bleed down to
100V.
4.6 Static Dissipation of Fuel system Components per SAE
J1645
This test is similar to the measurement of dissipation time of material and
objects described in Section 4.4. Refer to the Model 832 Clamp electrode
manual for detailed set up and operating instructions to perform this test.
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