PPC3™ OPERATION AND MAINTENANCE MANUAL
© 2002-2007 DH Instruments, a Fluke Company Page 76
The ControlRef function allows setting of whether the EXHAUST port condition
will be determined automatically using the exhaust sensor or set manually.
It also allows viewing of the current status of the EXHAUST port.
The normal condition of the ControlRef function is <1auto>. In this condition,
the operator need not be concerned with informing the PPC3 of EXHAUST port
pressure conditions as PPC3 determines the existing condition automatically.
The other settings are normally used only for special applications or trouble
shooting. Pressure control near and under atmospheric pressure will not
operate properly if ControlRef is not set correctly.
OPERATION
To access the CONTROL REFERENCE
function press [SPECIAL], <7internal>,
<2ControlRef>. The display is:
Control ref: 1auto
2vac 3atm 4view
Select:
<1auto> To set the PPC3 to determine the EXHAUST port condition
automatically using its internal exhaust sensor. This is the normal
Control Ref setting.
<2vac> To set the PPC3 to assume that a vacuum supply is connected to
the EXHAUST port.
<3atm> To set the PPC3 to assume that the EXHAUST port is open to
atmospheric pressure.
<4view> To view the current EXHAUST port condition assumed by PPC3 and
how it was determined.
Before connecting a vacuum pump or vacuum source to the PPC3 EXHAUST
port, see Section 2.3.6 for information on vacuum connection requirements
and precautions.
The ControlRef function setting is not range or control mode specific.
The setting made in ControlRef is common across Q-RPTs and ranges as
they are changed.
3.5.7.3 <3BARO>
PURPOSE
To view the value of atmospheric pressure as measured by the PPC3 on-board
barometer.
There is no on-board barometer in PPC3’s that have Gxxx (gauge) internal
Q-RPTs only.
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