PG9602™ OPERATION AND MAINTENANCE MANUAL
© 2011 Fluke Calibration
Page
62
Operation is in either
pressure-to-mass
or
mass-to-pressure
mode
(see Section 3.10.12).
To operate in differential mode, set the PG9000 Differential Mode Controller
(see Figure 19) to apply pressure defined by PG9000 to the high side of the DUT.
Table 15.
Valve Settings for Operating in Differential Mode
VALVE
VALVE SETTING
Control Selection
To adjust pressure under PG9000 piston-cylinder PG
To adjust static pressure: STATIC P
PG Shutoff
Piston is floating or near floating: OPEN
Any other time: CLOSED
Test Bypass
To make differential pressure measurements: CLOSED
To set or check DUT zero: OPEN
Static P Selection
OFF
If static pressure is atmospheric pressure: VENT or OFF
Note
For the highest quality differential mode measurements, use
consistent conditions for static pressure and PG9000 vacuum
reference pressure at each point. Set the PG9000 Differential
Mode Interconnections Kit CONTROL valve to STATIC P to
readjust the static pressure to the same value at each point if
necessary. This value should be the same as the value at which
the RPM offset was determined.
See
Typical Differential Mode Operational Sequence
Figure 19 for a schematic of the Differential Mode Controller and its valves.
Set RPM offset at desired static pressure (see Section 3.10.4.1, Selecting
Differential Mode, Setting Static Pressure, Finding RPM Offset (
<1run>
)).
Select
pressure-to-mass
or
mass-to-pressure
mode (see Section 3.10.12).
Put the Differential Mode Controller PG SHUTOFF valve in CLOSED position.
If desired, read DUT output at zero differential pressure with
TEST BYPASS valve open. Put TEST BYPASS valve in CLOSED position. If
desired, put CONTROL valve in STATIC P position and use system control
component to adjust static pressure to starting value.
Press
[ENT]
and enter a pressure or mass value. Load mass as instructed on
PG9000.
Install the bell jar on PG9000, shut the PG9000 vacuum vent valve, open
vacuum reference shutoff valve. Wait for vacuum under bell jar to reach
Ready
condition. If using AMH automated mass handler and mass loading resolution of
0.1kg, mass can be changed without breaking vacuum.
Put CONTROL valve in PG position and use system control component to float
PG9000 piston. Slowly put PG SHUTOFF valve into OPEN position. Readjust
pressure to float the PG9000 piston-cylinder if necessary.
If desired, put CONTROL valve in STATIC P position and use system control
component to adjust static pressure to starting value.
When PG9000 indicates
Ready
on all
Ready/Not Ready
indicators, take DUT
reading at differential pressure indicated on the top line of the PG9000 display.
Slowly put PG SHUTOFF valve in CLOSED position.
Summary of Contents for PG9000 Series
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