Norsonic nor140, Instructional Manual, Page: 38 / 220

20
Chapter 4
Simple sound measurements
Simple sound
measurements
The Nor140 may still be used as a simple sound level
meter. The only thing you really need to set up is the
measurement duration, which at least must be set up
to match the amount of time you intend to be measur-
ing. If it is set to a longer time, this will constitute no
problem – just press the
STOP
key when you want to
terminate an ongoing measurement.
However, you should consider the settings of the
time constant and the spectral weighting (C- or Z-
weighting, see
Setting C or Z as spectral weighting
network
for more on this) also, but once they are set, the
instrument will remember these until they are changed
to something else.
Setting the duration
Your instrument may, or may not be equipped with the
optional extension 6, which is the time profile logging.
This affects the look of the measurement duration set-
up menu. To read more about optional extensions see
The principle of the optional extensions.
How the menu looks with and without the optional
extension 6 installed is shown overleaf.
Navigating in the menus.
Observe the
following general guidelines applicable to
every Nor140 menu:
• To navigate between editable parameter fields in
the menu, use the cursor keys
• The editable field currently selected is shown in-
verted (white text on black background)
• Use the
INC
and
DEC
keys to increment or dec-
rement the current setting of the parameter. Al-
ternatively use the keypad to key in the required
value, whenever applicable. The # sign will ap-
pear in the lower line of the display whenever the
instrument accepts numerical inputs
• If you use the numerical keypad, be sure to
press
ENTER
before moving to the next field to
alter. This is not needed when you use the
INC
and
DEC
keys.
• To leave the menu putting changes into effect
press
ENTER
.
• There is no cancel function available.