DH Instruments PPC3 - Turning off Absolute and Negative Gauge Measurement Modes for Axxx (Absolute) Q-Rpts; Table 26. Calibration Point Sequence, Premium Class, Bgxxx Q-Rpts

5. MAINTENANCE, ADJUSTMENTS AND CALIBRATION
Page 127 © 2002-2007 DH Instruments, a Fluke Company
Table 26. Calibration Point Sequence, Premium Class, BGxxx Q-RPTs
CALIBRATION
SEGMENT
POINT
NO.
POINT
[% OF SPAN]
1
1 0 %
2 15 %
3 30 %
4 40 %
5 45 %
6 50 %
7 55 %
8 60 %
9 70 %
10 85 %
Ascending
11 100 %
12 70 %
13 50 %
14 30 %
Descending
15 0 %
1. The BG15K span is – 15 to + 15 kPa, 30 kPa total. Therefore,
0 % is – 15 kPa, 25 % is – 7.5 kPa, 100 % is + 15 kPa, etc.
BGxxx (bi-directional gauge) Q-RPTs that will not be used in negative gauge
measurement mode may be calibrated in gauge (positive pressures) measurement
mode only. Use the gauge mode (Gxxx) calibration point sequence (see Table 25).
BGxxx Q-RPTs calibrated in gauge measurement mode only should not be used in
negative gauge mode.
5.2.5 TURNING OFF ABSOLUTE AND NEGATIVE GAUGE
MEASUREMENT MODES FOR AXXX (ABSOLUTE) Q-RPTS
 PURPOSE
To prevent operation in absolute and negative gauge measurement modes with
an Axxx (absolute) Q-RPT.
 PRINCIPLE
Axxx (absolute) Q-RPTs are frequently used in gauge measurement mode only
(see Section 3.3.3,  PRINCIPLE). Axxx Q-RPTs that are used in gauge mode
only, may be calibrated in gauge mode with a reference that applies gauge
pressures. Calibration with an absolute reference is not necessary. However, if
an Axxx Q-RPT is calibrated in gauge mode, it is not possible to know if it is in or
out of tolerance in absolute and negative gauge modes. To avoid using
absolute and negative gauge measurement modes on an Axxx Q-RPT that is
calibrated for gauge mode only, access to absolute and negative gauge modes can
be turned ON and OFF. This is accomplished in the [SPECIAL], <8cal> menu.
 OPERATION
See Section 5.2.7 for more detailed information on editing and viewing Q-RPT
calibration information.
Turning absolute and negative gauge mode operation ON and OFF for a Q-RPT
occurs in the same area in which calibration coefficients are edited. To access
the Q-RPT calibration editing area press [SPECIAL], <8cal> and select the
desired Q-RPT. Then select <1edit> to make changes.