DH Instruments E-DWT-H, Руководство по эксплуатации и обслуживанию

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5. MAINTENANCE, ADJUSTMENTS AND CALIBRATION
Page 101 © 2009 DH Instruments, a Fluke Company
Note
It is not necessary for the calibration pressure standard to apply precisely
the nominal pressure value of each calibration point as long as the exact
value of the applied pressure is known. Best results are obtained if the
actual applied pressure is within 5 % of the recommended nominal point.
Table 16. Calibration point sequence for E-DWT-H RPM4-E-DWT Q-RPTs
CALIBRATION
SEGMENT
POINT
NO.
POINT
[% OF SPAN]
Ascending
1 0%*
2 10
%
3 25 %
4 50 %
5 75 %
6 100 %
Descending
7 75 %
8 50 %
9 25 %
10 10 %
11 0%*
* AutoZ the RPM4-E-DWT with reservoir shut off valve close, TEST shut off valve open, top
TEST1 port open.
5.3.5 RPT Calibration Using CalTool for Q-RPT
S
Software
To calibrate RPM4-E-DWT Q-RPTs using CalTool software, refer to Sections 5.3.1, 5.3.2,
5.3.3 and 5.3.4 in this manual and then refer to the CalTool for Q-RPTs Software Manual.
CalTool for Q-RPTs software and manual are supplied on the General Accessories Disk and
can be downloaded from
www.dhinstruments.com .
5.3.6 Editing and Viewing Q-RPT Calibration Information

PURPOSE
View and/or edit Q-RPT calibration information fields including:

The calibration date – This field is normally used to record the date on which the
Q-RPT is calibrated.

The value of absolute mode AutoZero P
offset
– Always 0 Pa. Not used in
RPM4-E-DWT A70M/A7M-AF.

The value of PA – The pressure adder for the selected Q-RPT (see Section 5.3.1.1).

The value of PM – The pressure multiplier for the selected Q-RPT (see Section 5.3.1.1).

OPERATION
Note

As editing PA and PM values will change the calibration of the Q-RPTs,
the edit function should only be used by qualified personnel as part
of the calibration process. Caution should be taken to avoid
accidental editing. A user level security system is available to control
access (see Section 3.9.5.5).

A new RPM4-E-DWT is delivered with PA and PM values set to zero
and 1 for all ranges. This does not mean that the RPM4-E-DWT has not
been calibrated. In the original factory calibration, privileged factory
coefficients are used for calibration with the user PA and PM set to
zero and 1.