Calibrating The Instrument; Starting A Measurement - Cirrus Research Trojan Lite User Manual

CK:199L Trojan LITE Noise Nuisance Recorder User Manual Guide Page 11

Calibrating the instrument

The instrument should be calibrated before each
measurement. To calibrate the instrument, switch on the
acoustic calibrator and verify that the green indicator light is
showing on the calibrator.
Carefully attached the calibrator to the microphone and
press the Calibrate key on the sound level meter.
The instrument will not perform a calibration. When this is
complete and has been successful, the display will show
93.7 and the instrument is ready to be used.
Press OK return to the main screen.
Attached the windshield to the microphone to protect it from
damage.

Starting a measurement

To start a new measurement, press the Start
key on the sound level meter.
The first measurement will run from when the
start button is pressed up to midnight. At that
time, the current measurement will be stored
and a new 24 hour measurement started. This
will continue until the instrument is stopped.
The display will change and in the top left corner
will be shown a red spinning indicator. This
shows that the instrument is now measuring and
storing noise levels.
The main screen will now show the overall LAeq
as the large number with the current 1 second
LAeq and LAFmax shown below.
The graph will change colour from a dark green to a light green to show that the data is
being recorded.
The case can be closed and locked ready for the user to make audio recordings.