7. MAINTENANCE OF TRACEABILITY AND RECALIBRATION
Page 137 © 2005 DH Instruments, Inc.
Figure 58. ADCS Tools FPG Run Screen
7.2.2.2 OPERATOR INITIATED LOAD CELL ZERO AND SPAN
ADJUSTMENT
The ADCS-601 operator can initiate an FPG8601 load cell zeroing and/or span
adjustment process. To avoid intefering with ADCS-601 operation, this should
be done when the FPG8601 is NOT the active pressure standard (see Section
4.1.3). To zero or span the FPG8601 load cell, expand the ADCS Tools
FPG
Run Screen by pressing the [FPG] button on the Main Toolbar (see Section
4.3.6.2). In the FPG Run Screen, the [Zero FPG] and [Calibrate FPG] buttons
can be used to initiate these activities.
7.2.3 FPG8601, VALIDATE WITH PG7601
7.2.3.1 OVERVIEW
The overlapping range and high uncertainty ratio of the FPG8601 and PG7601
pressure standards allow the FPG8601 to be validated by comparison with the
PG7601. The validation process is performed automatically by ADCS Tools.
The validation can be run in absoloute or gauge measurement mode. The absolute
mode validates the complete system including the reference vacuum CDGs. Gauge
mode validation can also be used to check gauge mode only, if desired.
The validation routine compares the PG7601 and FPG8601 at pressures across
their overlapping ranges and logs the results. The comparison is made using a high
precision pressure monitor (RPM4 A100K) as a comparison standard to avoid the
practical difficulties of automating a direct comparison between the FPG8601 and
the PG7601. At the end of the test, a pass/fail indication is given. A data file with
validation results can be viewed and a report can be generated.
See Section
7.2.3.2 for instructions on running the FPG8601 validation and
viewing results.
<FAIL> in the FPG Validation Results Screen (see
Section
7.2.3.2) indicates that
the FPG8601 pressure standard may be out of tolerance or there is a problem with
another component of
the ADCS-601 system. Troublshooting should be performed
To Next Page
Loading...