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2.2.7 AUTO MODE
These controls provide for programming the unit in the AUTO mode and
are functional only when the AUTO/MAN button is in the AUTO (down)
position.
2.2.7.1.TESTS
2.2.7.2.INTERVAL
2.3
Displays and Meters
Three types of indicators are used in the unit. Analog meters indicate voltage
and charge levels, multicolored point source LED indicators display test status,
cutoff threshold and high voltage presence information, and a LED numeric
readout displays the decay time and the AUTO mode test sequence number.
2.3.1
Meters
2.3.1.1 SAMPLE CHARGE Meter
This 10-position rotary switch selects the number of tests to be
conducted. It should be set when the system is in the ZERO/STBY
state prior to the start of the automatic test sequence. If the switch
is set to zero, the unit will not go into the TEST mode when the
CHG button is depressed, but will remain in either TEST OVER or
ZERO/STBY.
This continuously variable control is used to select the time interval
between the completion of one test and the start of the next (time
sample is grounded). The interval time may be set to any value
from about 1 second, when the control is in the MIN position, to
about 25 seconds, when the control is in the MAX position. When
the pointer on the INTERVAL knob is set to 5, the interval will be
about 5 seconds, a convenient interval time for most testing.
During the interval time, the DECAY TIME display will hold and
display the decay time of the last test and the AUTO mode counter
will display the number of the test run just completed.
This analog meter is part of the Electrostatic Voltmeter sub-system
in the Static Decay Meter. It indicates the true relative charge level
on the test sample. The zero (center scale) position is used in the
MAN mode to calibrate the system for offsets and thermal drift that
can occur. The ±5kV points on the SAMPLE CHARGE meter scale
are used to calibrate the system to the full charge level on the test
sample. The meter also provides the operator with information
about the presence or absence of initial static charges on the test
sample.
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