Power Consumption
5
Song Meter SM2BAT
Copyright © 2009-2011
Cables
The SMX-US is a powered microphone with low impedance and can drive
cables up to 100 meters without a preamplifier and without any noticeable
loss at frequencies up to 120kHz.
The SMX-US microphone can be either connected directly to the SM2
enclosure without any cable or extended on one or more lengths of our
standard one meter, ten meter and fifty meter cables up to the maximum.
For best results, the SMX-US microphone should be mounted on a cable
and placed away from the Song Meter enclosure or other hard objects in
order to reduce echos.
Power Consumption
The following table illustrates the typical power consumption for different
configurations and settings. Note that actual consumption may vary depending
on flash cards, variation in electronic components, and other variables:
High quality Alkaline D cells can deliver about 14,000mAh capacity at 20
°
C.
With compression and triggers, this translates to about 95 hours record time with
192kHz mono, 70 hours record time with 192kHz stereo, and 75 hours record
time with 384kHz mono. Longer deployments are possible with larger external
batteries using the Song Meter SM2PWR power adapter sold seperately.
When the SM2BAT daughter card is not being used, for example when the Song
Meter SM2 is configured for sampling rates at or below 48kHz, it will still
consume some additional current when recording compared to an SM2 without
the SM2BAT card installed. In the case of the 192kHz stereo card, 25mA of
additional current is used. In the case of the 384kHz mono card, 15mA of
additional current is used.
Rate and
Channels
Uncompressed
Compressed
Compressed
w/ Trigger
192kHz x 1
115mA
145mA
150mA
192khz x 2
115mA
175mA
195mA
384kHz x 1
90mA
155mA
185mA
