PG7000™ OPERATION AND MAINTENANCE MANUAL
© 1998-2008 DH Instruments, a Fluke Company
Page 40
Piston rotation rate
Ready/Not Ready
character indications include:
<*> Rotation
rate
Ready:
Rotation rate is within the rotation rate limits specified in the
current piston-cylinder module file) (see Section 3.11.1.1).
<
<
>
Rotation rate Not Ready, low:
Rotation rate is less than the lower rotation rate limit
specified in the current piston-cylinder module file (see Section 3.11.1.1)
or motorized rotation system is currently engaged. Note that the low rotation limit is
automatically reduced when the mass loaded on the piston is less than 3 kg. The
<
<
>
flashes if the piston is floating to alert the user that this indicator is
Not Ready
.
<?>
Rotation rate not known:
Current specified mass load is less than the load of the
( bell). The bell must be installed for PG7000 piston rotation rate measurement
to operate correctly so piston rotation rate cannot be measured when the bell is not
installed.
At mass loads less then 3 kg the low rotation limit is automatically reduced to an
operational minimum to maximize free rotation time.
In PG7102 and PG7202 high line differential pressure mode (see Section 3.9.4.2), the
piston rotation rate
Ready/Not Ready
indicator applies to the pistons of both the tare and the
reference PG7000. For
Ready
to be indicated, both pistons must be within the ready limits for
piston rotation rate.
3.4.3
VACUUM REFERENCE READY/NOT READY (PG7601 ONLY)
The vacuum reference
Ready/Not Ready
character is only used with PG7601, as it is the
only PG7000 model with vacuum reference capability. It is only active when operating in
absolute by vacuum
mode (see Section 3.9.4).
The vacuum reference
Ready/Not Ready
character indicates
Ready
or
Not Ready
based on
the value of reference vacuum when making measurements in
absolute by vacuum
mode.
This ensures that definitions of absolute pressure with a vacuum reference will be made with
the vacuum under the PG7601 bell jar lower than a specified value. When the vacuum is not
low enough, vacuum measurement errors may be excessive.
The vacuum reference
Ready/Not Ready
character is the third character from the left on the
top line of the main run screen.
The vacuum reference
Ready/Not Ready
criterion is determined by the current SETUP file
and can be customized by the user (see Section 3.10). The vacuum reference criterion is
a fixed value that can be customized by the user when the vacuum reference selection in the
SETUP file is
internal
. If the selection in the SETUP file is NOT
internal
, the vacuum reference
Ready/Not Ready
character always indicates
Ready
and the value cannot be customized.
Vacuum reference
Ready/Not Ready
character indications include:
< >
(Blank) Vacuum reference Ready/Not Ready is not in use.
This is not a PG7601;
or if PG7601, current measurement mode is not
absolute by vacuum
.
<*> Vacuum
reference
Ready.
Vacuum value is below limit specified in the current
SETUP file if source is
internal
OR source is
default
or
user
and the vacuum value is
not a measured value
(
see Section 3.10).
< > >
Vacuum reference Not Ready.
Current SETUP file source for vacuum is internal
and vacuum value is above the limit specified (see Section 3.10). The
<
>
>
flashes if
the piston is floating to alert the user that this indicator is
Not Ready
.
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