5. MAINTENANCE, ADJUSTMENTS AND CALIBRATION
Page 105 © 1998 DH Instruments, Inc.
5.2.3 VIEWING AND EDITING AUTOZERO VALUES
PURPOSE
To view and edit autozero information.
OPERATION
Viewing Autozero Information
To view current autozero information use 1View of 1AutoZ of 4Internal under the SPECIAL
menu. Then select the reference transducer (Hi or Lo) for which you desire to view the
information. After selecting the reference transducer, pressing ENTER steps through displays
of autozero information for each range.
The information displayed includes:
• autozero date: The date at which the last autozero function was executed or autozero
values were edited [YYMMDD].
• PA(z)net: The currently used value of PA(z)net [Pa].
• PA(z)tare: The currently used value of PA(z)tare [Pa].
Editing Autozero Information (PA(z)net)
To edit the value of PA(z)net use 2Edit of 1AutoZ of 4Internal under the SPECIAL menu.
Then select the reference transducer (hi or lo) for which you desire to edit the information.
After selecting the reference transducer pressing ENTER steps through each range identifying
the range in one display and presenting the information to be edited in the next screen.
After the last range of the selected reference transducer has been displayed, if PA(z)net for
any range has been edited, a display giving the choice of whether to activate the edited value
or not is presented. Selecting 1Yes causes the edited value to be implemented. Selecting
2No returns to the reference transducer choice without implementing edits.
The PA(z) date is changed automatically to the current date using the PPC2 AF internal
calendar when an edit of PA(z)net is activated or when the autozero routine is executed.
Editing Autozero Information (PA(z)tare)
The determination of PA(z)tare is considered part of the calibration process of the PPC2
AF and the value of PA(z)tare is considered to be calibration data. Therefore, running the
PA(z)tare routine and editing of PA(z)tare are included in the calibration function, not the
autozero function (see Section 5.4.4.5).
To edit the value of PA(z)tare use 2Edit of 2Cal of 4Internal under the SPECIAL menu. Then select
the reference transducer (hi or lo) and range (1, 2 or 3) for which you desire to edit information.
After selecting the reference transducer and range, pressing ENTER displays the calibration
date and range full scale and then steps through the current values of PA, PM and PA(z)tare.
These values can be edited.
If any value is edited, a display giving the choice of whether to activate the edited value or not
is presented. Selecting 1Yes causes the edited value to be implemented. Selecting 2No
returns to the reference transducer choice without implementing edits.
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