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

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3. OPERATION
Page 47 © 2009 DH Instruments, a Fluke Company
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<Pressure units of measure>: The units of measure screen from the
[UNIT] function key is presented (see Section 3.7.3). Select the desired
pressure unit of measure. The choice of units may be modified (see Section
3.9.6).
•
<DUT full scale>: Enter the full scale pressure (maximum pressure) of
the DUT in the measurement mode and pressure units that have been
specified in the previous two steps.
•
<DUT tolerance>: Enter the DUT measurement uncertainty, accuracy
or precision specification as desired in
±
% FS (percent of full scale).
This value will be used to determine appropriate RPM4-E-DWT
resolution and stability test settings.
•
<Test increment>: Enter the test increment in % FS of the DUT.
When executing the test, the test increments will be from zero to the DUT full
scale, dividing by the value of the increment. If a non-even increment value
is entered, the actual increments will be rounded to the lower number of
increments. For example, if the DUT full scale is 10 000 psi and the
increment specified is 42 %, the Sequence will run points of 0, 5 000 and
10 000 psi because 42 % goes into 100 less than three but more than two
times.
•
<Test point sequence>: Select <1up> for the AutoTest sequence to
run from zero to the DUT full scale; <2down> for the sequence to start at
the DUT full scale and run down to zero, <3u&d> for the sequence to run
from zero to the DUT full scale and back to zero; <4d&u> for the
sequence to run from the DUT full scale down to zero and back to the
DUT full scale.
After the last test definition entry, a screen is offered for the user to check that
the correct test has been defined or selected and that it does not exceed the
range of the device or system being tested:
1. Indication of minimum and maximum
pressure included in the sequence which is
about to run.
ENTER to run psi g
0 to 5000
Pressing [ESC] returns to the AutoTest selection screen without AutoRanging the
RPM4-E-DWT and without sequence execution. Pressing [ENT] causes the
RPM4-E-DWT to AutoRange based upon the DUT characteristics (see Section 3.7.5)
and the AutoTest proceeds to text execution (see Section 3.7.11.2). To AutoRange the
RPM4-E-DWT based on DUT characteristics but not run a test sequence,
[ESC] right
after AutoRanging completes (at the <Set valve for…> screen).
3.7.11.2 Test Execution
The last step of test initialization is to AutoRange the RPM4-E-DWT (see Section
3.7.11.1), then test execution begins.
In dual Q-RPT E-DWT-RPM4 models, the
first step of test execution is to set the
E-DWT-H Lo Q-RPT shut off valve correctly
for the Q-RPT that will be used to run the
test (see 3.4). The RPM4-E-DWT display is
(
<XX> is Lo or Hi):
Set valve for XX RPT
Set the Q-RPT shut off valve to shut off or connect the RPM4-E-DWT’s Lo
Q-RPT as indicated by the E-DWT-H valve indicator LED (see Section 3.4). Turn