Chapter 3 – Taking Measurements
Measurement Settings
BB 1219 – 11
29
Integrating Sound Level Meter Type 2239 A
User Manual
To set the measurement range:
1. If the instrument is measuring, then press to stop it.
The Measurement Window must read
STOP (as shown be-
low), not
RUN.
2. Check the current measurement range. It is shown at the
top of the Measurement Window. (In the example above,
the range is 30 to 100 dB.)
3. To select a new range, press repeatedly until the range
you need is displayed in the Measurement Window.
4. Use the quasi-analog display to decide if you have set the
range correctly. If the display is blank most of the time,
then sound levels are too low; select a lower measurement
range. If the display ever becomes full and the value for
the upper limit of the measurement range changes to read
“
OVL”, then sound levels are overloading the instrument;
select a higher range.
3.4.2 Setting the Frequency Weighting
The frequency weighting adjusts how the sound level meter
responds to different sound frequencies. Type 2239 A supports
the “A” and “C” time weightings as they are defined in the IEC
and ANSI standards (see Chapter 6).
The frequency weighting you choose will usually depend on
the regulations according to which your are measuring. If no
frequency weighting is specified, then use A-weighting.
Fig.3.7 The display when measurement is stopped
STOP 00:05:41
MaxP 94.7 dB
AF Leq 45.8 dB
30 100
bb221911.book Page 29 Tuesday, July 24, 2001 11:23 AM
To Next Page
Loading...
