Chapter Three: Operation
36
Description of Parameter Selection and Adjustment
Set Pt 1 High
Default Value: OFF
This sets the high limit of the set point. Above this pressure, the set point relay will be de-energized.
Press the
RAISE or LOWER buttons to enter the value desired. The minimum value is OFF; this shuts the
set point off. The next increment is 0.2% of the full scale range. For example, if the full scale range is 1
torr, the increment sequence is OFF, 2.0 mTorr, 3.0 mTorr, etc.
When the
RAISE or LOWER buttons are pressed, the display will change slowly at first. If you hold the
button down for a few seconds, the rate of change will increase to allow you to make large changes more
quickly.
SET PT 1 HIGH operates in conjunction with SET PT 1 LOW. While the PDR 2000 is in this mode, the
set point may be assigned to either
GAGE 1 or GAGE 2 by pressing the GAUGE SELECT button.
Set Pt 1 Low
Default Value: OFF
This sets the low limit of the set point. This is the pressure at which the set point relay will be energized.
Operation is similar to that of SET PT 1 HIGH above. The minimum value is OFF; this shuts the set
point off. The next increment is 0.1% of the full scale range. For example, if the full scale range is 1 torr,
the increment sequence is OFF, 1.0 mTorr, 2.0 mTorr, etc.
Note SET PT 1 LOW operates in conjunction with SET PT 1 HIGH.
Note The High and Low set point allow the user to set the hysteresis of the set
point operation. As the system is pumped down, the set point relay will
be energized (set point turns on) as the pressure drops below SET PT 1
LOW. The relay will remain energized until the pressure rises above SET
PT 1 HIGH.
It is not possible to adjust the High set point to be lower than the Low set point. If you adjust the High set
point below the pressure previously selected for the Low set point, the PDR 2000 will automatically
reduce the value for the Low set point so that it is the next increment lower than that of the High set
point.
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