PPC4™ OPERATION AND MAINTENANCE MANUAL
© 2009 DH Instruments, a Fluke Company
Page 32
PRINCIPLE
The AutoTest function is intended to facilitate the execution of a series of pressure control
target values such as when PPC4 is used to run a calibration sequence on a device or system
being tested.
There are three sequence choices for AutoTest:
Exercise
Cycle the Test Pressure
between atmosphere or vacuum and a
maximum target pressure such as when exercising a UUT prior to
calibration.
The information to the right of
Exercise:
in the AutoTest menu is the last
executed exercise sequence, pressure range and number of cycles.
Quick Test
Allows quick definition and execution of a sequence
in the current range
and using all of the current settings
(pressure unit of measure,
measurement mode, control mode, control settings, display resolution).
The information to the right of
Quick Test:
in the AutoTest menu is the
step size and direction for the last executed Quick Test.
Advanced Test
AutoRanges PPC4 based on the full scale and tolerance of a device
under test
, prompts the user through the increments of a calibration
sequence and logs calibration data. The Advanced Test function allows for
the pressure at each target point to be adjusted so that the device under test
reads a cardinal target pressure point. This is particularly useful when
calibrating analog gauges.
The information to the right of
Advanced Test:
in the AutoTest menu is
the number of saved tests available for selection.
In both the Quick Test and the Advanced Test, the PPC4 records the value of the PPC4
pressure at the time
is used to advance to the next test point. Following the completion
of the test the PPC4 values for all of the test points are displayed in a list. If the user is
calibrating an analogue device, such as a gauge, the user can adjust the PPC4 pressure to
set cardinal points on the analogue device before advancing to the next pressure. If this is
done, the list of pressures at the conclusion of the test is the list of PPC4 pressures
corresponding to the analogue cardinal points.
OPERATION
AutoTest is not available with the Basic Interface.
For Advanced Interface see Section 5.7.2.
3.2.16 Head
PURPOSE
To cause a pressure fluid head correction to be added or subtracted to the pressure
measured by the PPC4 reference pressure transducer in order to predict the pressure at a
height other than the PPC4’s reference level.
Содержание PPC4
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