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2.2.4 Operate Controls
The unit has four operating states related to sample decay time
measurement. Three of the four states, ZERO/STANDBY, CHARGE and
TEST are operator controlled while the fourth state, TEST OVER is
automatically programmed by the unit at the end of each decay time test.
2.2.4.1 ZERO/STBY
This momentary push button switch, when activated, places the
unit in the ZERO/STANDBY state. In this state, the High Voltage
Power Supply is turned ON, the electrostatic sensor shutter in the
Faraday Cage is closed, and the sensitivity of the SAMPLE
CHARGE meter is increased to allow the meter to be accurately
set to zero in the MANUAL mode. Further, when depressed, the
ZERO/STBY button causes the DECAY TIME and AUTO mode
indicators to reset to zero.
In the AUTO MODE, depressing the ZERO/STBY button will stop
the automatic test sequence and reset the DECAY TIME and
AUTO mode counters to zero.
2.2.4.1 CHG
This momentary push button switch, when activated, places the
unit in the CHARGE state. In this state, the High Voltage Power
Supply is ON, and the shutter in the sensor head of the
Electrostatic Voltmeter is open, allowing the SAMPLE CHARGE
meter to read the charge on the sample.
In the Manual mode, the unit will remain in the CHARGE state until
the operator starts the test by pushing the TEST button. In the
AUTO mode, if the SAMPLE CHARGE meter has been previously
adjusted to read 5kV (as required for automatic operation), the unit
will step to the CHARGE state when the CHG button is depressed
and then will automatically step to the TEST state when the sample
voltage reaches 95% of full charge. In this mode, the automatic
test sequence will be repeated automatically with the unit stepping
from CHARGE to TEST to TEST OVER and then back to
CHARGE for the number of test cycles selected by the AUTO
MODE TESTS switch.
6
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