output would be approximately 2.200 V.
For mass position readings under ±2.5 V, the table cell is green, for readings from
±2.5V to ±3.5 V, the cell is yellow, and for readings above ±3.5 V, the cell is red.
Together these values provide the health of the Trillium Compact seismometer.
8.4 Viewing Seismometer Control
The Seismometer Control page allows you to enable or disable calibration, change the
XYZ/UVW output mode, and to change the long/short period mode for the seismometer. Click
Apply to save your settings. These settings will reset to the factory default settings when the
firmware is rebooted or the unit is power cycled.
1. Once a control is set on this page, the corresponding digital control line is
subsequently ignored. Selecting the Use control line option tells the Trillium
Compact to again obey the control line for that function.
2. Settings on this page are always reset to factory defaults on power up or reboot.
The sections on the page are as follows:
l Calibration Enable. Calibration can be enabled for the three U, V, and W axes
simultaneously, for a specific axis, or disabled for all axes. Select Use control line to
permit the control line input to enable or disable calibration for all axes simultaneously.
The default is Use control line.
l Output Mode. Choose the output mode of XYZ or UVW (see "UVW and XYZ Output
Signals" on page53 for a detailed explanation of the output signals). Select Use
control line to permit the control line input to select between XYZ and UVW modes.
The default is Use control line.
l Long or Short Period Mode. The lower corner of the seismometer response can be
changed from the normal operating mode of 120 s period to a “short period” response
of approximately 1 s period. This may be useful when leveling the seismometer,
allowing you to see the mass positions quickly respond to changes in tilt, or once the
seismometer is leveled, to allow the mass positions to quickly settle. Be sure to set the
seismometer to “120 second” (Long period) mode when recording seismic signals. The
default setting is Use control line.
Chapter 8 - Using the Web Interface
16889R10 • 2020-11-12 Page 64
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