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

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E-DWT-H OPERATION AND MAINTENANCE MANUAL
© 2009 DH Instruments, a Fluke Company Page 18
Table 3. Settings and what they are specific to
(range, measurement mode, Q-RPT, system)
SETTING PURPOSE SPECIFIC TO SECTION
[Unit] Set pressure unit of measure Range 3.7.3
[Display] Set bottom line display function System 3.7.7
[Head] Set fluid head correction height, fluid, unit of
measure System 3.7.8
[SDS] Not used in this RPM4 model Not used None
[AutoZ] Run AutoZ Q-RPT and measurement mode 3.7.10
Resolution Set pressure display resolution Range 3.8.2
Stability Set
Ready/Not Ready
stability test. Range 3.8.3
Upper Limit Set upper and lower pressure limit alarm Range and measurement mode 3.8.4
AutoZ AutoZ, ON/OFF, set and view values Q-RPT and measurement mode 3.9.1
Screen Saver,
Sound, Time,
ID, Level Set system user preferences System 3.9.5
Cal Various Q-RPT and barometer calibration
functions Q-RPT or barometer 5.2.2
3.1.2 Pressure Ready/Not Ready
There is a
Ready/Not Ready
indicator LED on the RPM4-E-DWT front panel to the left of the
display. It is intended to provide the user with a clear and objective indication of when a
stable pressure has been achieved.
Ready
is indicated when the current stability (rate of
change) of pressure is less than the stability limit. The stability limit is set automatically by
AutoRange or AutoTest (see Sections 3.7.5, 3.1.3). It can also be set by the user (see
Section 3.8.3). The
Ready
indication is often used when comparing the RPM4-E-DWT and a
test device to indicate when a valid reading can be made.
The
Ready/Not Ready
LED indications are:
<Green > Pressure
Ready
The pressure stability is within the stability limit.
<Red> Pressure
Not Ready
The pressure stability is NOT within the stability limit.
The default stability criterion is 0.01% of full scale of the active range per second.
3.1.3 Automated Test And Calibration Sequences
The RPM4-E-DWT AutoTest function supports “Quick” and “File” automated calibration
sequences. These automatically AutoRange the RPM4-E-DWT, setting its resolution,
stability limit and upper limit based on the characteristics of the device under test. They also
prompt the user through the increments of the calibration sequence and log calibration data.
The AutoTest function should be used for most common calibration tasks, especially
calibration of analog pressure gauges.
3.1.4 Typical Operating Sequence To Run A Test
The typical operating sequence to run a test is as follows:
AutoZero the RPM4-E-DWT:
Disconnect the E-DWT-H TEST port.
Close the reservoir shut off valve.
Press [AutoZ] on the RPM front panel (see Section 3.7.10).