Norsonic nor140, Instructional Manual

Page: 68 / 220

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Chapter 8
Enhanced time profile measurements
No back-erase in profile pause mode.
The resumption of a paused measurement
will cause up to 20 seconds (adjustable
from 0 - 20 s) acquired immediately before the pause
to be erased. This applies to the global measurement,
but not to the profile.
Assume you have set up the measurement to also
include profile and that the measurement is running.
If you press pause, the global data acquisition will
be halted, but the profile will still acquire data! These
data will be marked P for pause to denote that they
were acquired in pause mode and that they do not
participate in the global level assessments.
When you later press pause again to resume,
the amount of periods marked as paused will be
expanded backwards in time (about 10 seconds) to
include periods acquired in the time-span subject to
back-erasure in the global mode.
The reason why we designed it this way, was to
provide you with the complete overview – if you later
transfer the acquired data to your PC you will be able
to do calculations on any parts of the profile while at
the same time you’ll be able to see the intervals that
didn’t take part in the global assessments.
Consequently, the duration of the measurement
will seem ambiguous. The global duration will be less
the pause and less any back-erase, while the profile
will have a duration including the pause length and
without back-erase!
The effect of pressing stop before
resuming.
If you terminate an ongoing
measurement prematurely by pressing the
STOP
key and later resume the measure-
ment by pressing
PAUSE/CONT
an “S” marker will
be added to the period within which the pause/cont
key was pressed – i.e. we mark out the first period
after resumption.
The pause marker
The line denotes
periods are
marked
The enhanced profile offers a time resolution
(period length) down to 50 ms! Between 50 ms and 1 s
the resolution is adjustable in 25 ms steps. Above 1 s
the step size is 1 s as is the case for the basic profile.
Setting a period length lower than a second
• Set the resolution to 1 s and press the
DEC
key
to enter the ms area. Scroll down to the required
setting or use the numerical keypad as usual
after the ms sign appears. Note that if you keep the
DEC
key (or the
INC
key) depressed it will, after a
while, speed up the scrolling.
or
• Key in 59 s as the resolution and then press
ENTER
followed by
INC
, the resolution will be set
to 50 ms immediately. Press
INC
to adjust, or use
the
NUMERICAL KEYPAD
to set the value directly.
Step size is 25 ms. If you key in a value between
valid settings, the value will be put to the nearest
valid setting.