5. Electronics
5.2 SOFT AND HARD POWER ON/OFF
The power line circuit breaker/mains switch is used to Hard Power
On and Off the Instrument. When this switch is in the Off position
the Instrument is Hard Powered Off and all power is removed from
the Instrument; however, the Instrument remains grounded as long
as it is connected to a properly grounded AC power Outlet.
Table 5-2. Hard and Soft Power On/Off
Hard Power Soft Power Systems Available
OFF OFF None
OFF Cannot be
ON
None
ON OFF Electronics are powered on, fan can
run as needed
Heater, motors, valves, video
displays are all off.
ON ON All systems are operational.
Once the Instrument has been hard powered on, the Instrument is
turned on or off with the soft power on/off switch on the
membrane switch panel (see Section 2). The soft power on/off
switch does not break the mains power to the Instrument, therefore
the electronics are powered on.
157-1278-912 Rev A 5-5
November 2003
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