3
Operating
Operating
Overview of operation
The list below is a brief overview of the steps for running a study.
Integrating measurements
Integrating measurements compute the average value over a period of time. In many work
environments, noise levels may be highly variable making it difficult to assess the sound level.
With the averaging function, you will see steadier values over the Run-Time (RT).
The chart below depicts the SPL and L
EQ
values measured over the RT. When the
measurements are compared, the SPL values measure the maximum and minimum values
while the L
EQ
provides steadier readings over the length of the study.
Figure 1-4: Comparison of noise sampled over Run-Time (SPL & L
EQ
values)
Quick Help List: typical sound session
1.
Power on the SD-200 and ensure the windscreen is attached.
Note: if battery indicator appears, this signifies the instrument needs to be charged.
(See “Charging”)
2.
Select the desired settings (A/C weighting, F/S response) and the desired measurement via
the keypad.
3.
Position the SD-200 microphone so it is angled about 70 degrees from the noise source.
4.
Measures: when first powered on, the SD-200 displays the current SPL or the last viewed
parameter prior to power off.
For integrated measurements, press key. (Noting the L
EQ
/L
AVG
values will provide
steadier values over a period of time.)
To view measurements, repeatedly press key and the SD-200 will toggle through
the various screens (SPL, L
EQ
/L
AVG
, LED Alert , MAX, MIN, Run-Time .)
5.
Power off the instrument.
Integrating example
LEQ provides steadier
values (about 90 dB)
over the RT
