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 32
In E-DWT-H models with two Q-RPTs, any time a range change causes the active Q-RPT to
change, the E-DWT-H Lo Q-RPT shut off valve must be operated to connect or disconnect
the Lo Q-RPT from the TEST port. The green Lo Q-RPT valve position LEDs indicate the
correct position of the Lo Q-RPT shut off valve knob based on the Q-RPT currently in use
(see Section 3.4).
Pressing [ESC] while in the RANGE function returns to the MAIN RUN screen without
making a range change.
W
Caution
In E-DWT-H models with two Q-RPTs, the Lo Q-RPT shut off valve protects
the Lo QRPT from overpressure when the Hi Q-RPT is in use. Familiarize
yourself with E-DWT-H operation (see Section 3.4) before changing ranges
and applying pressures. Always turn the Lo Q-RPT shut off valve fully in
the direction of the lighted green LED before applying pressure.
Note
•
Range full scale limits are given in the pressure unit that is currently
active for that range.
•
Pressing [+/-] from the MAIN RUN screen provides a shortcut to a
momentary view of the active range.
•
Many RPM4-E-DWT settings and functions are range specific. See
Table 3 for identification of range specific settings.
•
For best metrological performance, vent and AutoZero the
RPM4-E-DWT Q-RPT before changing ranges.
3.7.3 [UNIT]
 PURPOSE
To select the unit of measure in which RPM4-E-DWT displays pressure values.
 PRINCIPLE
RPM4-E-DWT allows the unit of measure in which pressure values are displayed to be
changed.
RPM4-E-DWT supports 13 standard pressure units of measure as well as user defined units.
To simplify operation, quick access to up to six units is made available under the
[UNIT] key.
The [UNIT] key contents can be customized by the user to any configuration of six units (see
Section 3.9.6).
Note
Internally, RPM4-E-DWT always operates in Pascal (Pa), the SI unit of
pressure. Values of pressure are represented in other units by the
application of conversion factors to convert from Pa (see Section 7.1.1).
 OPERATION
To change the active pressure unit of measure for a range, press [UNIT] from the MAIN RUN
screen while the range is active. The display is:
The cursor is on the number corresponding to the
active pressure unit of measure for the active range. 1psi 2MPa 3kPa
4bar
To change the pressure unit of measure, select the desired unit. Making the selection returns
to the MAIN RUN screen with the selected unit active.