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PG9602™ OPERATION AND MAINTENANCE MANUAL
© 2011 Fluke Calibration
Page
110
and verify that the readings are correct. Note that a fluid head correction should be
set if the external barometer is not at the PG9000 reference level. This correction
may cause the reading of the external barometer and the value of ambient
pressure indicated by the PG9000 to not be identical (see Section 3.12.3.3).
Note
For communications with an external barometer on COM2 to be
established properly, the inquiry string to send to the barometer
must be defined following this section and the PG9000 COM2
port and barometer COM port must have the same
communications settings. Press [SPECIAL] and select
<5remote>, <2COM2>, <1settings> to set up PG9000 COM2
communications settings. When unable to establish
communications between COM2 and the external barometer,
consider using the PG9000 RS232 self test to verify COM2
operation (see Section 3.12.5.3). If both a barometer and a
vacuum gauge are connected, the barometer must be an RPM3
or RPM4 and must always be the first device connected to the
PG9000 Platform COM2.
3.12.5.5 External Vacuum Gauge Communications (COM2)
PURPOSE
To configure communications with an external vacuum gauge from which PG9000
will read the value of reference vacuum under the bell jar used in the calculation of
absolute pressure in absolute by vacuum measurement mode (see Section 3.10.4).
Note
The source of the value of vacuum pressure used by PG9000 in its
internal calculations is determined by the Vac setting in the current
SETUP file (see Section 3.11. Configuring communications with an
external vacuum gauge does NOT set PG9000 to utilize the
external vacuum gauge.
PRINCIPLE
PG9000 measures the reference vacuum under the bell jar in its calculation of
the pressure defined by the PG in absolute by vacuum measurement mode (see
Section 7.2). The source of the value is determined by the Vac setting in the
current SETUP file (see Section 3.11). The standard source of this value is
COM2
, which allows an vacuum gauge connected to PG9000’s COM2 RS232
port to be read automatically to obtain the reference vacuum values that are
used. In order to communicate with the external vacuum gauge, PG9000’s
COM2 must be properly set up. This setup occurs by pressing
[SPECIAL]
and
selecting
<5remote>
,
<2COM2>
,
<3vac>
.
Note
If a Fluke Calibration (DH Instruments) RPM3 or RPM4 is being
used on COM2 for external measurement of barometric pressure,
the vacuum gauge may be connected to COM2 of the RPM. In this
case, COM2 of the RPM barometer must be configured with the
same communication settings as the external vacuum gauge. If
both a barometer and a vacuum gauge are connected, the
barometer must always be the first device connected to the
PG9000 Platform COM2.
Содержание PG9000 Series
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