axis outputs can be digitized by placing the seismometer in UVW mode. For instructions on
how to set a Trillium Compact to UVW mode, see
"UVW and XYZ Output Signals" on page 53
5.5 State-of-Health Output Signal
The mass position output signal (MAXIMUM MASS POSITION) is provided to monitor the
effect of tilt and temperature on the spring that sets the rest position of the boom. As with
the calibration signal, this signal represents the state of the individual axes (UVW) rather than
the horizontal and vertical outputs (XYZ).
This signal represents the axis with the highest absolute mass position and its operational
range is ±4 V, with an optimal output of 0 V. A maximum mass position output signal greater
than ±3.5 V indicates that the Trillium Compact is no longer sufficiently level and may not be
providing useful seismic signals. Should this occur, visit the installation site as soon as possible
to level the unit.
5.6 Power Consumption
For long cables, account for the resistive voltage drop due to the cable length and, if
necessary, increase the voltage at the source.
For example, 50 m of 24 AWG wire has a resistance of 4.2 Ω in each direction.
Therefore the voltage drop due to the possible 100 mA leveling current at 10 V would
be 0.84 V. The supply should also be able to sustain a 1 W peak output at a voltage that
guarantees the seismometer receives at least 9 V.
Following are power consumption scenarios typical for a Trillium Compact seismometer:
l
Under normal operation, (the unit is level, there is a low seismic signal, the unit has
settled for at least 30 minutes, and the RS-232 serial port is not transmitting), power
consumption for 120 s models is approximately 180 mW and approximately 195 mW
for 20 s models
l
On start-up, power consumption may briefly surge to 1 W
l
Once level and operating normally, any additional power consumption above normal
quiescent, after the power-on inrush, is roughly proportional to the output signal and is
Chapter 5 - Input & Output Signals
16889R10 • 2020-11-12
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Содержание Trillium Compact
Страница 1: ...User Guide November 12 2020 Strategic Intelligence Fueled by Science...
Страница 76: ...Figure 10 2 Noise floor figure for 120 s models Chapter 10 Performance 16889R10 2020 11 12 Page 76...
Страница 78: ...Figure 10 4 Trillium Compact seismometer performance Chapter 10 Performance 16889R10 2020 11 12 Page 78...
Страница 83: ...Figure 12 2 Bottom view Figure 12 3 Side view Chapter 12 Features and Dimensions 16889R10 2020 11 12 Page 83...
Страница 85: ...Figure 12 6 Side view Chapter 12 Features and Dimensions 16889R10 2020 11 12 Page 85...
Страница 95: ...Figure C 1 Cut away illustration of a packed carrying case Appendix C Carrying Case 16889R10 2020 11 12 Page 95...