PPC2+™ Operation and Maintenance Manual
©2001 DH Instruments, Inc.
Page 34
3.2.4.1 OVERPRESSURE
FUNCTION
In addition to the UL function, PPC2+ has an overpressure function. This function
executes when the maximum RPT range is exceeded by 25 %. The function causes
all pressure control to be interrupted and disabled, changes the range to H3 and
causes the display to flash. The overpressure function also logs the time and date of
the overpressure condition to assist in incident diagnosis. To recover from an
overpressure condition, cycle PPC2+ power.
3.2.5 SEQ
m
PURPOSE
To execute a programmed sequence of automated pressure control target values:
Either a <quick sequence> to run in the current range with all current settings or a
<file sequence> specifying the range and settings to use.
m
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+ 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 (e.g., pressure
units, control mode, control settings).
•
File Sequence (see Section 3.2.5.2) allows execution of a preprogrammed sequence
script including the PPC2+ range to use, measurement mode, control mode, target
values and other operational settings.
m
OPERATION
When the [SEQ] function key is pressed from the
main run screen, the display is:
Select the sequence type desired. See Section 3.2.5.1 for quick sequence or
Section 3.2.5.2 for file sequence set ups. See Section 3.2.5.3 for running a sequence.
3.2.5.1
SETTING UP/EDITING A QUICK SEQUENCE
m
OPERATION
When <1Quick> is selected from the SEQ
function menu, the display is:
This selection provides the choice between running the quick sequence that is
currently set up or changing the quick sequence set up. Selecting <1Yes> will cause
the currently defined quick sequence to run (see Section 3.2.5.3). Selecting <2No>
will go to the quick sequence set up/edit routine.
1quick 2file
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