Song Meter SM4M User Guide Supplement
3 SM4M Specific User Guide Notes
Wildlife Acoustics, Inc.
page
20
using the triggers. To disable the scrubber, set
Min Duration
and
Max Duration
under
Audio Settings
. to
none
.
3.3
Recording Behavior
Three and a half minutes before the device starts a recording, the SM4M wakes
up from sleep mode to allow the hydrophone noise to settle before recording.
When processing consecutive recordings in a series, the first recording finishes
on time; however, the system needs several seconds before it will be able to start
the next recording. This results in the next recording starting a few seconds late.
To compensate, the SM4M automatically extends the duration of the recording
so it will finish on time to keep to the schedule. In this scenario, it is normal to
see a delayed start time and a shorter recording.
3.4
Measuring Hydrophone Sensitivity
We include this section because all SM4 models support this functionality;
however, this procedure is not intended for use with hydrophones, though it
could be utilized with a pistonphone to check hydrophone sensitivity.
1.
At the
Song Meter Main Menu
, select
Utilities
, and press
SELECT
. Select
Calibrate Mics and then press SELECT. The values under @1 represent dB (re
full scale) levels at 1 kHz, a good measure of acoustic sensitivity. The values
under @40 are for testing the SM4BAT recorder.
MICROPHONE
CALIBRATE
@1 @40
kHz
Ch 0: -62.4
-
73.8 dB
Ch 1: -62.5
-
73.6 dB
2.
Press
SELECT
when finished.
