USER MANUAL BATMODE 2S/2S+ SYSTEM
52
Figure 33: Trigger Level Calibration Dialog of the RECORDER Software
To daily check the sensitivity of the microphone by measuring the reference signal level, enable the
box <
Daily Testsignal
>. The playback time of the reference signal can be determined with the two spin
boxes. This is independent of the determined recording periods. Nevertheless, to avoid masking of bat
calls, it should not be within the recording periods.
If you want to execute the microphone sensitivity test at monitoring start, check the box <
Playback at
Monitoring Start
>.
In addition to the measured microphone sensitivity values stored in the file
"reference.txt", legal authorities often also demand to record the WAV files of the
respective test signals. If you have selected absolute recording periods in the
<Recording Times> - Box (see section Settings 4.2.3.1), these WAV files are
automatically saved no matter what time you have selected for the daily test signal.
However, if relative recording periods are selected, the WAV files will only be saved if
the time of the daily test signal is within the selected recording periods. Consequently,
if the recording of test signal WAV files is desired in the relative recording periods
case, select a time for the test signal that is safely within the relative recording
periods throughout the whole year (for example, 01:00).
4.2.3.3
Calibration
To make bat call recordings comparable and compatible to German BMU guidelines and the tool
ProBat, a calibration of the used trigger level threshold is necessary. For this purpose, open the
calibration dialogue by pressing the button <Change
Calibration
> (see Figure 34). To perform a
calibration, first select whether the microphone used on this channel has a built-in reference signal
speaker. The GM50 and GM90 microphone discs as well as the TM20 tower microphone are equipped
with reference signal speaker. In contrast, the tower microphone TM10 has no integrated reference
signal speaker. Subsequently, enter the desired trigger level threshold (default value: 37 dBSPL) and
the calibration data supplied with each microphone. Then press the <Calibrate now!> Button. For
further
information
on
BATmode
microphone
calibration
visit
http://www.bioacoustictechnology.de/calibration-of-the-batmode-system/?lang=en
