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Once you have set a test pressure,
E-DWT-H will automatically test for stability,
and indicate to the operator when it is safe to
take data. Press [ENT] to collect a data point
.
Hint:
Try collecting a data point while the
pressure is still unstable and you
have not yet seen the stability light
illuminate green – to see and prove
the unit’s reaction to a technician
trying to ignore or override the
stability test.
Note:
The stability ready/not ready limit is
equal to 10% of the DUT tolerance.
To collect test data, simply select [ENT].
E-DWT-H will either respond with a tone to
indicate that the DUT measurement at that point
is in tolerance, or a lower tone and OT
indication on the display to indicate that the
DUT measurement is out of tolerance.
When the test is complete, use [SETUP],
<5ATest>, to view the stored test results.
Performance and Safety Features to Note
• Note that in the E-DWT-H design, special
attention was given to making a system that
minimize vessel expansion and thermal effects
that can cause the system to require a long
time to reach stability. As such, an operator
should be able to set stable test points in about
30 seconds, or no more than 1 minute
depending on the DUT tolerance.
• The system of lights and audible warnings on
E-DWT-H is intended to keep operators from
applying a high pressure to RPM4-E-DWT while
the Lo Q-RPT is selected. The green lights near
the Lo Q-RPT shutoff valve indicate the position
that the valve should be in based on the current
RPM4-E-DWT selection.
• There is a relief valve built into E-DWT-H that
protects the Lo Q-RPT in the event that the
operator mistakenly applies a high pressure to
the Lo Q-RPT circuit.
• In addition to audible warnings upon near-
overpressure of a Q-RPT; if the Lo Q-RPT
shutoff valve is set to Lo and the Hi Q-RPT is
selected on the RPM4-E-DWT, an audible
warning sounds if over 300 psi is sensed
because it is likely that the operator has
forgotten to change one of the settings and is
applying pressure to the Lo Q-RPT without the
ability to see the measured pressure.
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