3. OPERATION
Page 45
© 2007 DH Instruments, a Fluke Company
If the measurement mode selected is absolute, the lowest pressure must also be
defined. The display is:
1.
Entry field for minimum pressure of the QDUT
Test sequence. Recalls last value entered.
DUT low point:
2000 psi a
This entry determines the lowest pressure of the QDUT sequence for tests in
absolute measurement mode. Note that PPCH-G vents in response to a
command for zero absolute pressure and cannot set pressure under atmospheric
pressure (see Section 3.3.10.6). It is preferable to make the low point, a point
that PPCH-G can set. Enter the test lowest pressure point and press
[ENT]
.
The display is:
1. Entry field for tolerance of the DUT that is
being tested in % of the DUT’s span.
DUT tolerance:
0.05 %FS (span)
This entry determines the in and out of tolerance limits for the DUT when the test
is run. It is also used to determine appropriate PPCH-G resolution and control
limit settings for the resulting AutoRange range.
Enter the DUT tolerance and press
[ENT]
. The display is:
1.
Entry field for sequence pressure increment in
% of full scale. Recalls last value entered.
Test increment:
20.0%FS
This selection determines the size of the pressure increment for the test in terms
of % of the full scale (FS) value entered in the DUT Full Scale screen. The pressure
sequence will run in pressure steps of (full scale x increment %) ending with the
uneven increment if applicable.
Enter the desired pressure increment and press
[ENT]
.
The display is:
Test point sequence
1up 2down 3u&d 4d&u
This selection determines the order in which the test sequence increments will
execute. Selecting
<1up>
causes the sequence to execute starting at low point
and going to the full scale value.
Selecting
<2down>
causes the sequence to run starting at the full scale value
and going to low point.
Selecting
<3u&d>
causes the sequence to run from low point to full scale and
back to low point.
Selecting
<3d&u>
causes the sequence to run from full scale to low point and
back to full scale.
The next display is the proposed AutoRange range to run the QDUT test (see
Section 3.3.4 for additional information on AutoRange).
