PPC2 AF OPERATION AND MAINTENANCE MANUAL
© 1998 DH Instruments, Inc. Page 116
6. Enter the calibration pressure and PPC2 AF readings into a spreadsheet. Calculate the
"non-corrected" PPC2 AF readings by backing out the PA, PM and PA(z)net recorded in
2. and 3. above following:
non-corrected reading = (corrected reading - PA - Pa(z)net)/PM
7. Perform a linear regression to find the offset and slope that best fits the non-corrected
PPC2 AF readings to the calibration standard pressures. The offset is the new value of
PA, the slope is the new value of PM.
8. Under SPECIAL, 4Internal, 2Cal, 2Edit, 2Ref, write the new values of PA/PM and the new
calibration date for the reference transducer and range calibrated.
9. Under SPECIAL, 4Internal, 2Cal, 3Run, 2PA(z)tare, set the PA(z)tare for the reference
transducer and range calibrated by running PA(z)tare.
10. Calculate as "left data" for the calibration if desired following:
as left reading = (non-corrected reading • new PM) + new PA
5.4.6 VIEWING REFERENCE TRANSDUCER CALIBRATION
INFORMATION
OPERATION
The data pertaining to a reference transducer calibration can be viewed using SPECIAL,
4Internal, 2Cal, 1View and then selecting the reference transducer and range.
Calibration data that can be viewed includes the current values of:
• Calibration Date
• PA
• PM
• PA(z)Tare
• As left calibration points if the last calibration for this reference transducer and range was
performed using the on-board calibration function.
To view the current value of PA(z)net, use SPECIAL, 4Internal, 1AutoZ, 1View.
As left calibration data points are only available for ranges whose calibration was included
in the last calibration sequence. For example, if only Rng1 is calibrated there will be no as
left data for Rng2 and Rng3, even if there was data previously.
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