Brüel & Kjær 2240 Guide De L'utilisateur page 30

24 Integrating-averaging Sound Level Meter Type 2240 – User Guide
Making a Measurement of a Specified Duration
Regulations may require you to take a measurement of a specified duration (this duration may
be 1 second, 10 seconds, 5 minutes or some other value). In any case, it is normally required that
the specified duration is strictly adhered to.
When making a measurement of specified duration, simply watch the timer at the upper right-
hand corner of the display screen. For example, to make a 10-second measurement from a
starting time of 00 m 00 s, simply press the stop button
at most 1 second after it displays that time. You can then scroll through the sound level parame-
ters using the
Side Panel Functions
Lifting the side panel flap, you find two functions: the power switch and calibration switch.
Fig.4.6
Type 2240's side panel
1) Power Switch: Turn the instrument on and off. The instrument automatically begins calcu-
lating L when it is switched on. Switch the power off when the instrument is not in use.
A
2) Calibration switch: Using the enclosed mini-screwdriver, electrically adjust the instru-
ment's calibration. See "Electrical Calibration" on page 20. for more information.
Note: The connector found on the side panel is for factory test purposes only.
key to get a report of all the values for that 10-second period.
1. Power switch
when the timer displays 00 m 10 s –
2. Calibration
Switch