3. OPERATION
Page 29 © 1998 DH Instruments, Inc.
Upper limit values are always specified in absolute pressure. Keep this in mind when
setting upper limits for gauge measurement mode.
Upper limits are always specified in the current pressure unit. This creates an anomaly, in
the case of altitude units, since the maximum pressure defined in MIL-STD 859A is
roughly 179 kPaa (26 psia). This corresponds to an altitude of – 5 000m (- 16 480ft).
Therefore, it is not possible to specify an upper limit in altitude that corresponds to a
pressure greater than 179 kPaa (26 psia).
When the UPPER LIMIT has been exceeded, the display of current pressure flashes.
Reduce pressure using direct pressure control keys or an automated pressure command to
return to normal operation.
3.2.5 SEQ
PURPOSE
To execute a programmed sequence of automated pressure control target values
PRINCIPLE
The sequence function is intended to facilitate the execution of a series of pressure control
target values such as is commonly needed when PPC2 AF is used to run a typical calibration
sequence on a device or system being tested.
There are two types of sequences. Quick Sequence (see Section 3.2.5.1) allows quick
definition and execution of a sequence in the current range and using all of the current
settings (i.e. pressure units, control mode, control settings). File Sequence (see Section
3.2.5.3) allows execution of a preprogrammed sequence script including the PPC2 AF range
to use, measurement mode, control mode, target values and other operational settings (see
Section 3.3.3).
OPERATION
When the SEQ function key is pressed from the main
run screen, the display is :
Run sequence
1Quick 2File
Select the sequence type desired (see Sections 3.2.5.1 or 3.2.5.2).
3.2.5.1 SETTING UP/EDITING A QUICK SEQUENCE
OPERATION
When 1Quick is selected from the SEQ
function menu, the display is:
Run current quick
sequence 1Yes 2No
This selection provides the choice between running the quick sequence that is
currently set up or changing the quick sequence set up. 1Yes will cause the
currently defined quick sequence to run (see Section 3.2.5.3). 2No will go to the
quick sequence set up/edit routine.
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