70 Bedrock SMxx operating manual © Bedrock Audio BV, 2019
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• It is not possible to charge the batteries while measuring. Once you connect
the charger, the instrument will ask whether you want to go into charge
mode or operate on external power. If you answer “external,” then the bat-
teries will not be charged. The current from the charger will be used to
power the instrument, so that the batteries are not depleted.
• We advise to use discretion when powering the instrument externally from
an AC source while measuring. The instruments’ measuring electronics
are highly sensitive; the digital charging circuitry may have an impact on
the noise floor of the pre-amplifier and microphone, while noise and hum
from the AC charger may also be inserted. Although the electronics have
been protected against such sources of interference, we recommend that
you verify that electronic noise does not affect the measurement.
The self-diagnostic program that runs whenever the Bedrock SM50 boots up performs a
series of checks on the battery pack, which may result in one or more warning dialogs being
displayed. Please refer to the section “Getting started” for more details.
13.2. Power saving recommendations
How long the device can be used on a single charge depends on the mode and intensity of
use. Power conservation settings can be controlled from the device’s “hardware settings”
menu. With its default settings, approximately 350 STIPA measurements can be carried
out over the course of an 8 hour day without recharging.
Some ways to extend the battery life:
• Switch off the device when you do not plan to use it for a while
• Choose conservative power settings in the hardware menu. The LCD back-
light is a considerable factor in the overall drain on the battery.
• Disable “pre-amp phantom power” if you use a microphone that does not
need it.
13.3. Use of power banks and external battery packs
For very long measurement sessions, the battery capacity of the internal battery may be
insufficient. If you cannot spare the time to recharge in the middle of your session, we
recommend that you use an external USB battery pack (aka power bank). Even though the
SMxx has been certified to comply with applicable EMC standards, also when connected
to an AC source, the signal quality is always slightly better when powered from batteries.
When you connect the SMxx to an external battery pack, a dialog will appear asking you
whether you want to charge the device or operate on external power. We recommend that
you do not recharge the internal battery from the power bank, so choose “external.” The
internal battery will then not be charged, nor discharged, while measuring. Note that the
battery pack should have an output current rating of at least 1500 mA.
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