PPC2 AF OPERATION AND MAINTENANCE MANUAL
© 1998 DH Instruments, Inc. Page 110
5. Connect the calibration standard output to the PPC2 AF rear panel TEST port (1/4 in. NPT F).
6. Set PPC2 AF to desired pressure unit (see Section 3.2.2) and be sure “head” correction is
off (see Section 3.2.7).
NEVER apply pressure to the TEST port without having a pressure supply equal to or greater
than the applied pressure connected to the supply port and NEVER cause a sudden external
change in pressure as damage to internal PPC2 AF components could result. (See Section 2.3.5)
It is recommended when using a piston gauge to calibrate PPC2 AF, that the PPC2 AF direct
pressure control keys (see Section 3.1.2.2) be used to change the pressure rather than the
piston gauge valves. The piston gauge vernier can be used for fine pressure adjustment.
5.4.4 ON-BOARD REFERENCE TRANSDUCER CALIBRATION
FUNCTION
5.4.4.1 OVERVIEW
The on-board reference transducer calibration function is provided to simplify the
calibration process by prompting the user through the procedure, automatically
calculating new calibration coefficients and activating those coefficients if desired.
The calibration function handles the calibration of the Hi and Lo reference
pressure transducers independently. When calibrating a reference transducer,
any combination of its three ranges can be calibrated/not calibrated.
Calibration can also be performed without using the on-board calibration function
(see Section 5.4.5).
SUMMARY OF ON-BOARD CALIBRATION FUNCTION OPERATION
The on-board calibration proceeds as follows:
1. Select reference transducer to be calibrated (Hi or Lo) (see Section 5.4.4.2).
2. Decide whether to calibrate Rng3 of the selected reference transducer
(see Section 5.4.4.3). If yes, calibrate it. (see Section 5.4.4.4).
3. Decide whether to calibrate Rng2 of the selected reference transducer. If yes,
calibrate it, if no decide what PA/PM (see Section 5.4.1) will be used for it.
4. Decide whether to calibrate Rng1 of the selected reference transducer. if yes,
calibrate it, if no decide what PA/PM will be used for it.
5. Run the autozero routine to set PA(z)tare (see Section 5.4.4.5).
6. Preview the new calibration data if desired (see Section 5.4.4.6).
7. Activate results of the calibration process if desired (see Section 5.4.4.7.).
The complete procedure for one reference transducer including all three ranges
requires about 2 hours to complete.
Aborting a calibration: The calibration process involves extensive sequential
operations during which data is taken. If the process is aborted, the data
taken will be lost and the process will have to be repeated. To avoid
accidental loss of data, PPC2 AF protects against accidentally aborting the
process. It is not possible to abort using ESCAPE only. The intent to abort
and abandon data must be confirmed by specific key entry.
Be sure no “head” correction is active before running.
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