Norsonic nor140, Instructional Manual, Page: 51 / 220

33
Norsonic Nor140
Instruction Manual
To display other functions measured,
• Use the
FUNC
key. For the German-speaking
markets these functions will include L
eqI
and T
Max5
.
To switch between sound level meter display and
spectrum display:
• Press the
f
↔
t
key
To make the spectrum appear A-weighted
• Press the
A-
prew
key. The display will now appear
A-weighted. This is purely a display function and it
has no effect on the measured or stored data.
• Use the and keys. Use the and keys to
move to the lowest and highest frequency band.
To adjust the display top scale:
• If the bar graph fails to match the level measured
use the
INC
and
DEC
keys to alter the display top
scale setting.
To produce the results in tabulated form:
• Press
TBL
to produce a result table. Note that dif-
ferent tables will be shown dependant on the state
of the instrument. During and after a measurement
you may have both spectral values, statistical values
and normal result table for the selected frequency
band or weighting network. The up and down arrow
buttons is used for switching between the frequen-
cies and networks in tabular mode.
Resuming an ended measurement
Assume that you have set up the instrument to meas-
ure for 5 minutes and that you start the measurement.
After 5 minutes the measurement will end since the
measurement time elapsed equals the preset duration.
The measurement has now ended successfully,
as opposed to if you press the stop key to forcefully
terminate an ongoing measurement.
If you now press the
PAUSE/CONT
key, the
instrument will resume the measurement and go on
measuring for another 5 minutes so that the total meas-
urement time assumes 10 minutes, i.e. twice the initial
setting. If you do this again, the total measurement
time will be 15 minutes, i.e. three times the initial
setting and so on.
This way of prolonging a measurement will not
activate the back-erase feature.
The back-erase function
The Back-erase function allows you to halt an ongo-
ing measurement and erase the last part of it, before
you resume the measurement again. This function is
particularly useful to exclude undesirable noise events.
The Back-erase time can be set to any value between
0 and 20 seconds. Press
SETUP 1 > 9 > 8
to access
the menu.
When you press the
PAUSE/CONT
key during an
ongoing measurement, the instrument will temporar-
ily halt the measurement until the
PAUS/CONT
key is
pressed again. Dependant on the set back erase time,
the last acquired data will be erased
If the measurement has been running for less
than the set back-erase time when you press
PAUSE/CONT
key, the entire measurement will be
erased upon resuming the measurement. If less than
the specified back-erase time has elapsed since you
resumed a paused measurement, only the last part of
the measurement since the last resume will be erased.
Data acquired earlier are assumed to be accepted by
you.