DH Instruments ADCS-601, Operation And Maintenance Manual

Page: 88 / 174

ADCS-601™ OPERATION AND MAINTENANCE MANUAL
© 2005 DH Instruments, Inc. Page 76
LABEL DESCRIPTION
Ambient Temperature
Current value of ambient temperature read by the active pressure
standard. Value is from the PG7601 on-board temperature sensor
when the PG7601 is active; the FPG8601 mounting post sensor
when the FPG8601 is active.
Right click on the value to produces a pop up menu in which the
unit of measure can be changed, the resolution of the pressure
value can be adjusted and a strip chart of the value over time can
be displayed. Changing the
<Ambient Temperature> unit of
measure changes all ADCS Tools temperature displays.
Head Correction
Enter the difference in height between the reference level of the
ADCS-601 system and the device under test, in centimeters [cm]
(see Section 4.2.6). The value is positive if the DUT is above the
ADCS reference level, negative if it is below.
PG Pressure
(=> when active standard)
Displays the current pressure and unit of measure or the status of
the PG7601 pressure standard. The circular indicator is a
Ready/Not Ready indicator (see Section 4.1.1).
The pressure value shown is valid ONLY when the PG7601’s
piston is floating and the pressure is
Ready .
FPG Pressure
(=> when active standard)
Displays the current pressure and unit of meaure or the status of
the FPG8601 pressure standard. The circular indicator is a
Ready/Not Ready indicator (see Section 4.1.1).
Upper Limit
The maximum allowable target pressure for the ADCS-601. This
limit is imposed for all test and manually entered target pressures.
Change the limit by entering a new maximum pressure value in the
current ADCS-601 unit of measure. The mimimum allowable entry
value is 110 kPa (32.5 inHg). The maximum allowable entry value
cannot exceed 384 kPa (113.4 inHg).
The PG7601 pressure controller Upper Limit setting is forced to
110% of the
<Upper Limit> entry. Review the PPC3 Operation
and Maintenance Manual for details on the Upper Limit setting of a
PPC3.
Since the PG7601 can only set a target pressure within
approximately 1 kPa (0.3 inHg) of the requested target, it is
possible for an ADCS-601 pressure to exceed the
<Upper Limit>
entry by approximately 1 kPa (0.3 inHg).
4.3.5.2 ADCS SYSTEM DISPLAY
The ADCS System Display is a simplified operational schematic of the ADCS-
601 system that provides the operator with real time, quick visual indication of
ADCS-601 system states (see Figure 37). The schematic represents the
FPG8601 and PG7601 pressure standards, their pressure controllers and the
measured pressure and reference pressure circuits with valves.
Table 16 summarizes the symbols used in the ADCS System Display .