DH Instruments FPG8601, Руководство по эксплуатации и обслуживанию

Страница: 65 / 166

6. FPG TOOLS
Page 53 © 2007 DH Instruments, a Fluke Company
Table 8. <Logged Points>
Labels
LABEL DESCRIPTION
Grid Display Mode
The model and serial number of all active DUTs display in this list box. When a
selection is made, the grid is updated with data from the selected DUT.
Point
The number of the current data point.
Time/Date
Time and date of the current point. The time is formatted as a 24 hour value,
“hh:mm:ss”. The date format is year, month, day: “YYYYmmdd”.
Pressure Units
The selected pressure units and measurement mode at the time the point was
taken. This value will change with any new
[Units]
menu selection available.
After the pressure unit are a sequence of text tags to indicate the current
operational state these tags are listed below:
a
– The FPG is in absolute measurement mode.
ad
– The FPG is in absolute differential measurement mode.
g
– The FPG is in gauge measurement mode.
t
– A thermal transpiration correction is being applied to the FPG pressure.
h
– A head correction is being applied to the FPG pressure.
Status
This value contains any error status information present at the time the point is
logged (see Section 6.3.7). Points that are averaged contain an accumulation of
all individual error codes that occur over the course of the averaging cycle. This
information can be used to troubleshoot aberrant points.
Pressure is ready when there are no out of range errors in the system status
and the FPG pressure is within the stability setting or hold limit, based on
whether or not VLPC is actively controlling.
VLPC Target Pressure
The last set target pressure when the VLPC is in use. If a pressure target was not
set, the field displays “N/A”
Set Time
The time to reach stability after the last VLPC target pressure was set. If a point is
taken prior to reaching stability or the VLPC is not actively controlling, the field
displays “N/A”.
FPG Pressure
The calculated FPG pressure in the pressure units listed in the
<Pressure Units>
column. For averaged data points, the averaged FPG pressure is logged.
DUT Pressure
The calculated DUT pressure in the pressure units listed in the
<Pressure Units>
column.
DUT Output
The output of the DUT in the output units set up in the DUT configuration (see Section
6.6.2.3).
DUT Difference
The difference between the DUT pressure and the FPG pressure in the pressure
units listed in the
<Pressure Units>
column. When a DUT is not enabled, “----“
displays in this field.
DUT %FS Error
The difference between the DUT and reference divided by the full scale value of
the DUT times 100.
%Reading Error
The difference between the DUT and reference divided by the reference times
100.
FPG Min Pressure
The minimum FPG pressure logged as the result of an averaging cycle (see
Section 6.4.2). The value can be used to quantify control noise over the course of
an averaging cycle. For non averaged points, the instantaneous FPG pressure is
logged. In this case the value logged is the same as the
<FPG Pressure>
field.
FPG Max Pressure
The maximum FPG pressure logged as the result of an averaging cycle (see
Section 6.4.2). The value can be used to quantify control noise over the course of
an averaging cycle. For non averaged points, the instantaneous FPG pressure is
logged. In this case the value logged is the same as the
<FPG Pressure>
field.
STD FPG Pressure
The standard deviation of the FPG pressure in the current pressure units over the
course of an averaging cycle (see Section 6.4.2). The value can be used to
quantify control noise over the course of an averaging cycle. For non averaged
points, “N/A” displays.
Tare Mode
The measurement mode used for the system zero that was in effect when the
point was taken:
g
or
a
for gauge and absolute respectively.
Ν The direct load cell output in counts.