Initial Setup
2-7
Automatic Restart Function
The LI-8100A has the capability to restart a measurement following a power
interruption to the instrument. Enabling this feature requires the user to first
reposition a small jumper in the Analyzer Control Unit housing. When the jumper
is repositioned, power will be restored to the instrument when it becomes
available; note that this function is available only when the LI-8100A is powered
via the Auxiliary Sensor Interface, and is not available when powered by a battery
inside the Analyzer Control Unit. Note, too, that in order to restart the
measurement, this feature must also be enabled in software, following the jumper
placement.
The LI-8100A jumper is located on the underside of the circuit board located
directly below the PC card slots in the Analyzer Control Unit. Remove the access
panel to view the jumper. Note that there are three pins aligned horizontally on
the underside of the circuit board, below the words “Power On” imprinted on the
circuit board. When configured at the factory, the jumper covers the leftmost and
center pins (Keypad position, Figure 2-6). In this position, if power is interrupted,
the instrument can only be restarted by pressing the On/Off button on the keypad.
By repositioning this jumper so that it covers the center and rightmost pins (Aux In
position, Figure 2-7), power can be automatically restored when it becomes
available.
Figure 2-6. Keypad jumper position.
Figure 2-7. Aux In jumper position.
IMPORTANT: When the jumper is in the Aux In position, the LI-8100A presents a
potential shock hazard. For example, if power is interrupted and the unit shuts off,
it is possible to remove the access panel and make contact with electrical
components; if the user is unaware that a power interruption caused the instrument
to shut down, power could be automatically restored while the user is in contact
with these internal components. For this reason, we recommend that you always
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