5. MAINTENANCE, ADJUSTMENTS AND CALIBRATION
Page 111 © 1998 DH Instruments, Inc.
5.4.4.2 SELECTION OF REFERENCE TRANSDUCER (HI, LO) TO
CALIBRATE
OPERATION
From the main run screen select
SPECIAL menu, 4Internal, 2Cal, 3Run,
1Reference. The display is:
Run ref sensor cal
1Hi 2Lo
Select the reference transducer desired and press ENTER on confirmation
screen or ESCAPE to change selection. Go to Section 5.4.4.3.
When calibrating both the Lo and Hi reference transducer the Lo reference
transducer should be calibrated first as it will be used as the reference for
setting PA(z)tare on the Hi reference transducer (see Section 5.4.1).
5.4.4.3 SELECTION OF RANGE TO CALIBRATE AND
ASSIGNMENT OF PA/PM
PRINCIPLE
After having selected the reference transducer to calibrate (Hi or Lo) the opportunity
to calibrate/not calibrate, each range (Hi, Mid, Lo) of the selected reference
transducer is offered. Any combination of calibrate/not calibrate ranges is possible:
Summary of PA/PM Assignment Rules
If a range is calibrated, PA/PM will be recalculated for that range from the
calibration data just collected (see Section 5.4.1 Principle, PA/PM Coefficients
).
If a range is not calibrated the option is offered to retain the old PA/PM or apply
the PA/PM of a higher range that has been calibrated as part of the current
calibration procedure. This feature makes it easy to calibrate the Hi range only
and assure that the Mid and Lo ranges will be consistent with it if they are not
calibrated. It also makes it possible to calibrate ranges individually without
interfering with the calibration of another range.
OPERATION
Following selection and confirmation of the reference
transducer to be calibrated, the display is:
Cal Rng3(Hi) of
Hi ref? 1Yes 2No
Press 1Yes to proceed with the calibration of Rng3(Hi) (see Section 5.4.4.4).
Press 2No to refuse calibration of Rng3(Hi). From the
confirmation screen that follows press ESCAPE to
return to the "Cal Rng3(Hi)" screen or press ENTER to
continue. The PA/PM of Rng3(Hi) will be unaltered by
this calibration procedure. The next display is:
Cal Rng2(Hi) of
Hi ref? 1Yes 2No
Press 1Yes to proceed with the calibration of Rng2(Mid) (see Section 5.4.4.4).
Press 2No to refuse calibration of Rng2(Mid). From
the confirmation screen that follows press ESCAPE to
return to the "Cal Rng2(Mid)" screen or press ENTER
to continue. If Rng3(Hi) was calibrated as part of this
procedure, the option to use the new Rng3(Hi) PA/PM
or to retain the old PA/PM for Rng2(Mid) is offered.
If Rng2(Mid) is not calibrated as part of this procedure,
the PA/PM of Rng2(Mid) will be unaltered by this
calibration procedure. The next display is:
Cal Rng1(Hi) of
Hi ref? 1Yes 2No
Press 1Yes to proceed with the calibration of Rng1(Lo) (see Section 5.4.4.4).
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