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