DH Instruments FPG8601, Руководство по эксплуатации и обслуживанию

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6. FPG TOOLS
Page 57 © 2007 DH Instruments, a Fluke Company
LABEL DESCRIPTION
Ν
Load cell output in counts (mg). When the load cell is unstable, a red dot will
appear next to this display and a
B
will be logged in the
<Status>
field. Note that
the load cell is automatically zeroed when the FPG is turned on.
δ
Ν1
Correction factor due to the change in lubrication pressure since the last system
zero (see Section 2.7.1).
δ
Ν2
Correction factor due to the relative change in lubrication pressure and reference
pressure since the last system zero (see Section 2.7.2).
δ
Ν3
Correction factor due to the change in the reference pressure (atmosphere) after the
last system zero (see Section 2.7.3). In absolute mode, this value is zero provided
the last zero was also in absolute mode.
Lubrication Pressure
The lubrication pressure in kPa as read by the internal transducer. This value is
updated approximately every 1s to re-calculate the
<FPG Prs>.
ATM
The atmospheric pressure as read by the FPG internal transducer. Internal valves
are switched to read this pressure based on the
<Lubrication Switch Time>
value
(see Section 6.6.4). The pressure is updated in gauge mode only and when the
[ATM]
toolbar function is used.
Reference Pressure
This output is provided in gauge to absolute mode transition only. During the
transition, the internal transducer is switched to read the pressure in the reference
port to make sure the reference vacuum is activated. The output of the transducer
during this transition displays in this field.
Do not confuse this pressure with the vacuum reference pressure read by the
vacuum reference sensor.
P Ref
The pressure output by the vacuum reference sensor. This value is updated
approximately every 1s when the residual vacuum is active. This value can
activated or deactivated by using a
[Config]
,
[System Setup]
,
[Setup]
option (see
Section 6.6.2.1). The reference pressure is used in absolute mode operation only
(see Section 2.5). When no residual pressure device is set up the field displays “----“.
Post Temp
The average temperature of the mounting post PRTs in °C. When the difference
between the current temperature and the tare value becomes larger than the
temperature re-zero limit, the FPG must be re-zeroed before a “Ready” indication
can be achieved (see Section 6.6.4.3).
The second field in this display represents the average temperature rate of change
over the last minute. If this rate exceeds the rate of change limit, a re- zero warning
will display on the status bar and the FPG will indicate a “Not Ready” condition.
Lube Temp
The temperature measured by the lubricating volume PRT in °C. If the difference
between this temperature reading and the reading of the
<Post Temp>
differ more
than the re-zero limit, the FPG must be re-zeroed (see Section 6.6.4.3).
The second field in this display represents the average temperature rate of change
over the last minute. If this rate exceeds the rate of change limit, a re- zero warning
will display on the status bar and the FPG will indicate a “Not Ready” condition.