PPC3™ OPERATION AND MAINTENANCE MANUAL
© 2002-2007 DH Instruments, a Fluke Company Page 58
3.5 [SPECIAL]
PURPOSE
[SPECIAL] accesses a menu of PPC3 functions and features that are less commonly used or not
normally used in regular operation.
OPERATION
Press [SPECIAL] from the MAIN RUN screen to access the
SPECIAL menu. The display is:
1AutoZ 2remote 3head
4reset 5pref 6Punit
7internal 8cal 9log
Some screens, such as the SPECIAL menu, go beyond the two lines provided by the display. This is
indicated by a flashing arrow in the second line of the display. Press the cursor control keys to move
the cursor to access the lines that are not visible or directly enter the number of the hidden menu
choice if you know it.
SPECIAL menu choices include:
<1AutoZ> Manage AutoZero function for the active Q-RPT or utility sensor (see Section 3.5.1).
<2remote> View and edit PPC3 COM port (RS-232) and IEEE-488 interface settings (see Section 3.5.2).
<3head> Set HEAD function fluid and height unit of measure (see Section 3.5.3).
<4reset> Access PPC3’s various reset functions (see Section 3.5.4).
<5pref> View and set screen saver time, keypad sound frequency, unit ID number, time/date,
security protection level (see Section 3.5.5).
<6Punit> Customize the [UNIT] key pressure unit of selections (See section 3.5.6).
<7intern> Access internal functions including control configuration, control reference, on-board
barometer viewing, purge function ON/OFF, direct control of Q-RPT Lo Vent valves
(see Section 3.5.7).
<8cal> View and adjust PPC3 utility sensor, Q-RPT and barometer calibration coefficients
(see Sections 3.5.8 and 5.2).
<9log> View the PPC3 incident log (see Section 3.5.9).
3.5.1 <1AUTOZ>
PURPOSE
To offset the PPC3 system Q-RPTs relative to a reference value in order to compensate for
possible changes in Q-RPT zero between full recalibrations.
PRINCIPLE
AutoZ Purpose and Principle
The main component of the change over time of the PPC3 Q-RPTs is change in zero or
offset, independent of span. Offsetting or “rezeroing” PPC3 Q-RPTs relative to a reference
between recalibrations allows measurement uncertainty specifications to be maintained with
less frequent full calibrations. The PPC3 AutoZero function (AutoZ) provides full on-board
support for the rezeroing process to simplify its application by the user.
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