3. OPERATION
Page 27 © 2002-2007 DH Instruments, a Fluke Company
Ranges created using AutoRange may be saved with all their settings for reactivation (see
Section 3.4.1).
The [RANGE] function key allows the available PPC3 pressure ranges to be viewed and
selected, including automated switching of both internal and external Q-RPTs when
necessary.
OPERATION
Pressing the [RANGE] function key activates the range viewing and selecting function.
When the [RANGE] function key is first pressed, the range identification screen for the active
range is displayed. For example:
1. Q-RPT or utility sensor designator.
2. Type of range. DF for the Q-RPT’s default range; AR for a range
created by AutoRange.
3. Q-RPT or utility sensor position designator.
4. Current pressure unit of measure.
5. Full scale pressure in current unit of measure in gauge and/or
absolute measurement mode depending on type of Q-RPT and range.
Active A700K DF IH
psi 100g/100a
Pressing the [+/-] key or the [RANGE] key again while in the RANGE functions toggles
through displays of the other available ranges, from lowest range to highest range.
To select a range to become the active range, press [ENT] while the desired range is
displayed. PPC3 must be vented for the range change to occur. Press [VENT] if necessary
to complete the range change.
When selecting a range, if the range’s Q-RPT is an external Q-RPT and the PPC3 cannot
communicate with it, PPC3 displays <Cannot find range’s external Q-RPT (Xn)>.
Use [ENT] or [ESC] to return to the range selection screen. For information on setting up
and communicating with external Q-RPTs see Section 2.3.7.
Pressing [ESC] while in the RANGE function returns to the MAIN RUN screen with no range
change having been made.
Range full scale limits are given in the pressure unit that is currently active for that range
(see Section 3.3.1). Change the active unit to display the range limits in a different unit.
Pressing [+/-] from the MAIN RUN screen provides a shortcut to a momentary view of the
range identification screen for the active range.
PPC3 saved AutoRange ranges that use Q-RPTs in external RPM4s are available for
selection from the [RANGE] key. AutoRange ranges saved locally on the RPM4, are not
available on the PPC3 [RANGE] key.
Many PPC3 settings and functions are range specific. See Table 4 for identification of
range specific settings.
To protect against overpressure situations and for maximum measurement performance,
the active range can only be changed when the system is vented. If [ENT] is pressed while
in the RANGE function when PPC3 is NOT vented, the display indicates <Vent system fully
to change range>. Pressing the [VENT] key will cause PPC3 to vent and complete the
range change.
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