Power Considerations - Reftek 180-SM 2 Series User Manual

Rev 1.0
Detailed explanations and methods for using all SMx
datastreams and triggers, are provided in subsequent sections in this manual.
REF TEK pre-sets and tests the hardware of each SMx
to ensure that it performs as specified. The SMx
adjustments for normal operations. You may use a SMx
recorder, or you may use a network of many SMx
or site. During field operations, the SMx
SMx 2 has a network connection that allows connection to IP-based networks and
devices.
All SMx 2 DAS units employ hardware, firmware, and software that comply with the
requirements of the IRIS PASSCAL Program, portable and telemetry stations, US ARRAY
(the USGS and ANSS) specification for national, regional, strong motion, and structural
stations.

1.7.2 Power Considerations

This section describes current draw, power load, and general power supply
considerations for SMx
All SMx 2 DAS units operate on nominal 15-volt power (9.5 to 24 VDC). This range allows
2
a SMx DAS unit to be powered from an ordinary lead acid battery, a solar panel or an
AC power source. When powered with at least 14 volts on Pin A, both the optional
internal and external batteries can be charged from the SMx
To ensure continual, uninterrupted power to your SMx
regulated power supply that can deliver at least 1.25 times the maximum current that
the load of your combined system components requires. Be sure to account for the
cable resistance (especially if you build your own cables). Power for an external modem
is available from the network connector (12 VDC).
In general, perform the following to ensure a sufficient power supply:
1. Use the specification data and add the maximum current draw for the SMx
peripheral that uses the same power supply to obtain the maximum total current they will
draw at any given time then add at least 25%.
2. Check your power supply's specifications to ensure that it can handle this load. The power
specifications for SMx
REF TEK if you require more accurate calculations or other information regarding power
considerations.
Solar power setups are frequently used in remote locations and these are available in
several capacities that cover the various equipment configurations. Solar power arrays
Reftek Systems Inc.
180-SMx2 Users Guide
180-SMx2-UG
2
DAS can store data in a USB flash drive. The
2
DAS units, peripherals, and subsystems.
2 DAS units are provided for each configuration of SMx
2
DAS unit parameters, including
2
DAS before you receive the unit
2
DAS units do not require hardware
2 DAS unit as a stand-alone
2 DAS units deployed over a structure
2 itself.
2
DAS and peripherals, use a well-
11/29/2022
2 DAS and each
2 DAS. Contact
8