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1. Select the Cutoff level by depressing the appropriate CUTOFF button.
2. Select the number of test cycles desired by setting the AUTO mode
TESTS selector to the appropriate number (1-9). The selector should
be set such that the number desired is opposite the pointer on the
panel above the selector. Set the AUTO mode INTERVAL control so
that its pointer faces the number 5 on the panel. This will ground the
sample for a 5 second interval between test cycles. If more time is
required, rotate the knob clockwise toward MAX. In a similar way, the
interval time may be reduced by rotating this control counterclockwise
toward MIN. The range of the interval time is from approximately 1-25
seconds.
3. Start the AUTO mode test cycle by depressing the CHG button
momentarily. The unit will step to the CHARGE state, the electrostatic
sensor shutter will open and the SAMPLE CHARGE meter will
indicate the sample charge. When the sample charge reaches
±4.75kV (95% of full voltage), the unit will automatically step to the
TEST state. For samples with a high conductivity (short time
constant), the unit will step from CHARGE to TEST so rapidly that the
analog SAMPLE CHARGE meter will lag the actual measurement
cycle. This is normal.
In the TEST state, the Decay Time readout will be counting and the
SAMPLE CHARGE meter reading will be decreasing toward zero. The
CHARGING VOLTAGE meter will read zero, the HIGH VOLTAGE ON
light will turn off, and the AUTO mode readout will increase by one
count.
When the voltage on the test sample decays to the pre-selected cutoff
level, the unit automatically steps to the TEST OVER state and the
DECAY TIME readout will display the test sample decay time
measurement in seconds. The unit will remain in the TEST OVER
state until the interval time has lapsed. At the end of this time, the unit
will step automatically back to the CHARGE state and the test
sequence (CHARGE, TEST, TEST OVER) will be repeated. The
DECAY TIME readout will automatically reset to zero each time the
unit returns to CHARGE.
Testing will continue until the AUTO mode readout reaches the same
count as was set with the AUTO mode TESTS selector. When this
occurs, the unit will complete the last test and will go to TEST OVER
without stepping back to CHARGE. Nothing further will occur unless
the ZERO/STANDBY or the CHARGE button is depressed. To repeat
or reset the entire test run, momentarily depress the CHARGE button.
This action will reset the DECAY TIME and AUTO mode readouts to
zero and will re-start the test.
4. To terminate a test before the full number of tests is completed,
depress the ZERO/STBY button. The DECAY TIME and AUTO mode
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