PPC2 AF OPERATION AND MAINTENANCE MANUAL
© 1998 DH Instruments, Inc. Page 112
Press 2No to refuse calibration of Rng1(Lo). From the confirmation screen that
follows press ESCAPE to return to the "Cal Rng1(Lo)" screen or press ENTER to
continue. The option to use the new PA/PM of any higher range that has been
calibrated as part of this procedure or to retain the old PA/PM for Rng1(Lo) is
offered. If Rng1(Lo) is not calibrated as part of this procedure, the PA/PM of
Rng1(Lo) will be unaltered by this calibration procedure.
Following Rng1(Lo):
• If no range has been calibrated the display returns to the "Run cal" screen
(see Section 5.4.4.2).
• If any range has been calibrated, the next step in the calibration procedure is
the determination of PA(z)tare for the reference transducer being calibrated.
Go to 5.4.4.5 Setting PA(z)tare.
5.4.4.4 RUNNING THE CALIBRATION OF A RANGE
PRINCIPLE
Running the calibration of a range requires applying absolute pressures in 20 %
F.S. ascending and descending points starting and ending at zero (see Sections
5.4.2.and 5.4.3).
Summary of Calibrate a Range Sequence
The running of calibration of a pressure range using the on-board calibration
sequence proceeds as follows:
1. Prompt announces reference transducer (Hi or Lo) and range (1, 2 or 3)
being calibrated and the number of the next calibration point (1 to 11). Press
ENTER to continue.
2. Display of PPC2 AF measured pressure, current calibration point number and
instruction of calibration pressure to set. Apply calibration pressure and
press ENTER to continue.
3. Display of PPC2 AF measured pressure, current calibration point number and
180 second countdown for stabilization. Wait 180 seconds until count down ends.
4. Display requesting "ENTER standard pres." with entry field for the pressure applied
by the pressure calibration standard and current calibration point number.
Edit the pressure applied by the calibration standard and press ENTER.
5. Display of "ENTER to take point", PPC2 AF measured pressure and current
calibration point number. Observe the PPC2 AF measured pressure and the
pressure calibration standard. When ready, press ENTER to take the PPC2
AF reading for this calibration point.
6. Display of RESULTS screen for the calibration point. Indicates recorded PPC2 AF
pressure reading, calibration standard and calibration point number. Press ENTER
to accept the results or ESCAPE to reenter the calibration standard pressure
and repeat the PPC2 AF reading.
7. Go to 1. above for the next calibration point.
For information on making changes during the running of a calibration see
Backing Up in the Calibration, Repeating Points, Aborting below.
OPERATION
See Section 5.4.3. before beginning a calibration process.
The basic calibration sequence repeats
for each point, 1 through 11. The first
screen of each point provides a reminder
of the range and reference transducer
being calibrated and indicates the point
that is about to be executed:
Cal Rng3, Hi ref
Point 3
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