DH Instruments PPCK PLUS, Operation And Maintenance Manual

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PPCK+™ Operation and Maintenance Manual
Page 51
©2001 DH Instruments, Inc .
3.4.1.2 EDIT AUTOZ
The edit AutoZ function should be used with great caution as entering inappropriate
values and turning ON AutoZ may result in incorrect autozeroing and out of
tolerance measurements. In normal operation, the value of ZOFFSET should be
changed using the run AutoZ function (seen Section 3.4.1.3). The only expected use
of edit AutoZ is to set ZOFFSET to zero after a calibration of PPCK+ RPTs.
Before editing ZOFFSET, see Sections 3.4.1, PRINCIPLE and 5.2.6).
To edit the current ZOFFSET for the current range and measurement mode, press
[SPECIAL] and select <1AutoZ> , <3edit> . The display is:
1. Current measurement mode.
2. Current range.
3. Edit field for value of ZOFFSET.
The value of ZOFFSET is always displayed and entered in Pascal (Pa).
3.4.1.3 RUN AUTOZ
Run AutoZ is the function by which the current RPT reading is compared to ZSTD
and a new value of ZOFFSET representing RPT zero drift is determined (see
Section 3.4.1, PRINCIPLE, How AutoZ Works).
To access run AutoZ, press [SPECIAL] and select <1AutoZ> , <4run> .
If the measurement mode of the current range is gauge , run AutoZ occurs
transparently to the user whenever AutoZ is ON and the PPCK+ is in the
vented condition. The display is:
1. Indication of current range.
2
3
ZOFFSET absolute H3
0.0 Pa
Rng H3 is gauge,
no manual AutoZ