DH Instruments PG7000, Operation And Maintenance Manual

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PG7000™ OPERATION AND MAINTENANCE MANUAL
© 1998-2008 DH Instruments, a Fluke Company Page 86
OPERATION
To access the pressure or mass entry screen, press [ENTER/SET P] from any run screen. The
sequence after [ENTER/SET P] has been pressed varies between mass to pressure and
pressure to mass mode. The mode is selected by pressing [P
OR
M] (see Section 3.9.12).
See Section 3.9.11.1 for details on [ENTER/SET P] in pressure to mass mode and Section
3.9.11.2 for mass to pressure mode. See immediately below for typical operational sequences in
gauge and absolute modes. See Section 3.9.4.1, Operating in Differential Mode, for typical
differential mode operational sequence.
Typical Gauge and Absolute by ATM Mode Operational Sequence
Press [MODE] and select gauge or absolute by ATM mode as desired (see Section 3.9.4).
Press [P
OR
M] and select pressure to mass or mass to pressure mode (see Section 3.9.12).
Press [ENTER/SET P] and enter a pressure or mass value. If the piston is floating and
AutoRoate is ON, the braking function engages to stop piston rotation (see Section 3.9.8).
Load mass as instructed (see Section 3.6). If an AMH automated mass handling system
is active, the mass is loaded automatically with resolution of 0.1 kg.
Use the system pressure control component to float the PG7000 piston. If the AutoGen
function is ON, the automated pressure control component floats the piston automatically
(see Section 3.9.9).
When PG7000 indicates Ready on all Ready/Not Ready indicators (see Section 3.4), take a
DUT reading at the pressure indicated on the top line of PG7000 display.
Repeat Steps through for each desired pressure value.
Typical Absolute by Vacuum Mode Operational Sequence (PG7601 Only)
Press [MODE] and absolute by vacumm (avac) mode (see Section 3.9.4).
Press [P
OR
M] and select pressure to mass or mass to pressure mode (see Section 3.9.12).
Press [ENTER/SET P] and enter a pressure or mass value. If AutoRoate is ON, the
braking function engages to stop piston rotation (see Section 3.9.8).
Load mass as instructed (see Section 3.6). If an AMH automated mass handling
system is active, the mass is loaded automatically to resolution of 0.1 kg.
Install bell jar on PG7000, shut PG7000 vacuum vent valve, open vacuum reference
shutoff valve. Wait for vacuum under bell jar to reach Ready condition (see Section 3.4.3).
Use system pressure control component to float the PG7000 piston. If the AutoGen
function is ON, the automated pressure control component floats the piston automatically
(see Section 3.9.9).
When PG7000 indicates Ready on all Ready/Not Ready indicators (see Section 3.4), take a
DUT reading at absolute pressure indicated on the top line of the PG7000 display.
Shut vacuum reference shutoff valve, open vacuum vent valve. Wait for pressure under
bell jar to return to ambient. Remove bell jar. If an AMH automated mass handling
system is active and mass loading resolution is 0.1 kg, the vacuum does not need to be
broken and reestablished at each increment since the masses are moved automatically.
Repeat Steps through for each desired differential pressure point.
3.9.11.1 [ENTER/SET P] IN PRESSURE TO MASS MODE
PURPOSE
To enter and execute a pressure to mass command in pressure to mass mode
(see Section 3.9.12).