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

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3. OPERATION
Page 33 © 2009 DH Instruments, a Fluke Company
Note
•
The pressure unit of measure selected is range specific. When in a
given range, all functions and settings are represented in the current
measurement unit for that range. However, certain internal and/or
metrological functions (e.g., Q-RPT calibration coefficients) are always
represented in Pa regardless of the current range unit.
•
See Section 7.1.1 for tables of the
conversion
factors used by
RPM4-E-DWT.
•
If the pressure unit selected is inWa (inches of water), the reference
temperature for water density must be specified in a separate menu
(choices are 4ºC, 20ºC 60ºF). No reference temperature selection is
necessary for the unit mmWa as the only reference temperature
commonly used for mmWa is 4 ºC.
•
The choice of up to six units available under the UNIT function can be
customized from a wider selection by the user (see Section 3.9.6). The
units available under the UNIT function can be reset to default (see
Section 3.9.9.2).
3.7.4 [MODE]

PURPOSE
Not used in E-DWT-H’s RPM4-E-DWT. Measurement mode is always gauge (difference
from atmospheric pressure).
3.7.5 [AUTORANGE]
 PURPOSE
To automatically set up the RPM4-E-DWT to optimize its measurement characteristics and
features for a specific, user defined pressure range of operation.
 PRINCIPLE
RPM4-E-DWT is designed to support the calibration and test of a very wide variety of test
ranges.
The AutoRange function simplifies the task of setting measurement parameters appropriate
for the specific range in which a test is to be run. These are set automatically based on
operator entry of desired measurement mode, pressure unit of measure and range full scale. In
dual Q-RPT models, AutoRange also selects to most appropriate Q-RPT.
The selections and settings made by AutoRange are summarized in Table 5.
A range set up using AutoRange and all its range specific settings, may be saved for recall
using
[SETUP] , <1range> (see Section 3.8.1). Saved ranges are available for later selection
using [RANGE] (see Section 3.7.2). If a range created by AutoRange is not saved, it is
overwritten by the next AutoRange or erased when another range is selected.
Note
Press [ENT] from the main run screen in Rate DISPLAY mode to use the
[AutoTest] function to AutoRange the RPM4-E-DWT based on DUT
tolerance (see Section 3.7.11).