3. OPERATION
Page 55 © 2002-2007 DH Instruments, a Fluke Company
The display is:
1. PPC3 pressure logged for the test point.
2. Head, AutoZ and active Q-RPT indicator (same as in the
PPC3 MAIN RUN screen).
3. Indication that this point was out of tolerance. Indicates <IN>
if point was in tolerance. Definition of out of tolerance is
(Nominal point – PPC pressure > DUT tolerance * DUT FS).
4. Number of this test point / total number of points in the
sequence.
60.005 psi g hzX1H
View data OUT 2/11
Press [ENT] to move to the next data point or use the up and down cursor control keys to
scroll backwards and forwards through the test points. The data file header is between the
first point and the last point.
Press [ESC] to exit the data file. Confirmation is required to exit the data view function.
3.4.6 <6CONTROL>
PURPOSE
To set the automated pressure control mode for the active range, customize control
parameters, activate default control parameters.
PRINCIPLE
The CONTROL function allows the active control mode for the current range to be set to
either dynamic or static. The control mode set is specific to the active range and is saved
with that range when ranges are changed. For a complete description of the operation and
purpose of static and dynamic control modes see Section 3.2.1.
When a control mode is selected using the CONTROL function, CONTROL parameters are
automatically set to default values for the active range (see Table 7 for definition of PPC3
default control parameters). The default control parameters have been determined to be
most suitable for the typical user to operate within PPC3 pressure control and measurement
specifications. Each PPC3 default range has default control parameters and AutoRange
automatically sets control parameters appropriate for the AutoRange range.
Control mode parameters can be viewed and customized in the CONTROL function
(see Section 3.4.6.1). Customizing the hold and/or stability control parameters changes the
conditions required for a Ready condition to occur (see Section 3.2.2). This can be used to
increase control speed (reduce time to Ready), usually by decreasing control precision, or to
increase precision which usually decreases control speed. For example, changing the dynamic
pressure control hold limit from its default value of ± 50 ppm of the active range to ± 100 ppm of
the active range will decrease the time required to set a pressure since the limit within which
the pressure must be set has increased. However, it will also increase the maximum possible
control error when Ready is indicated.
Table 7. Default Pressure Control Parameters
STATIC MODE DYNAMIC MODE
HOLD LIMIT
± 1 % of range span ± 50 ppm of range span, 5 ppm of
Q-RPT span or 0.4 ppm of controller span,
whichever is greater
STABILITY LIMIT
50 ppm of range span or 2 ppm of Q-RPT
span, per second, whichever is greater
50 ppm of range span or 2 ppm of Q-RPT
span, per second, whichever is greater
OPERATION
To access the CONTROL function, press [SETUP],
<6control>. The display is:
Dynamic X1H
1limits 2mode
Select <1limits> to view or edit the current control limits (see Section 3.4.6.1).
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