6. FPG TOOLS
Page 55
© 2007 DH Instruments, a Fluke Company
Although the VLPC control window is available during the execution of a test sequence
(see Section 6.6.5), it is recommended that the controls not be used to prevent
corruption of the test sequence.
Figure 22. <VLPC Interface>
Table 9. <VLPC Interface>
Options
LABEL
DESCRIPTION
Vent
(Button)
This function vents the system pressure and opens the bypass valve. The
FPG/VLPC and any DUT connected is left in a safe condition when this operation is
complete.
Abort
(Button)
Aborts VLPC control. This means the VLPC will no longer dynamically control
system pressure. The last internal control point is left constant in the VLPC which
typically results in a stable FPG pressure.
Range
(Button)
When activated, a popup window allows the selection of the desired pressure range.
All pressure range values are listed in the current pressure display unit as the
approximate lowest
controllable
point for that range to the range full scale value.
Click the button that represents the desired pressure range. The current pressure is
vented, then the new pressure range will be set automatically. The process takes
about 30s depending on the current state of the system. The default hold limit
specified for the selected range is automatically set when the range change is
complete. Default hold limits are specified using the
[Internal Limits]
option (see
Section 6.6.4.7).
Figure 23. <Select VLPC Range>
Range
(Label)
Displays the last set range of the VLPC.
Target Pressure
(Entry Field)
Enter the desired target pressure in the displayed units then press the
[Enter]
key
or the
[Go]
button to set the pressure. The value displayed in this field always
represents the current target pressure when the VLPC is actively controlling
pressure. A “D” in the status indicator always notes VLPC control.
